Adding upstream version 1:9.11.5.P4+dfsg.upstream/1%9.11.5.P4+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

41 files changed, 15913 insertions, 0 deletions

diff --git a/lib/isc/unix/Makefile.in b/lib/isc/unix/Makefile.in
new file mode 100644
index 0000000..bdd7bfd
--- /dev/null
+++ b/lib/isc/unix/Makefile.in
@@ -0,0 +1,44 @@
+# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+#
+# See the COPYRIGHT file distributed with this work for additional
+# information regarding copyright ownership.
+
+srcdir =	@srcdir@
+VPATH =		@srcdir@
+top_srcdir =	@top_srcdir@
+
+CINCLUDES =	-I${srcdir}/include \
+		-I${srcdir}/../@ISC_THREAD_DIR@/include \
+		-I../include \
+		-I${srcdir}/../include \
+		-I${srcdir}/.. @ISC_OPENSSL_INC@
+
+CDEFINES =	@CRYPTO@
+CWARNINGS =
+
+# Alphabetically
+OBJS =		@ISC_IPV6_O@ @ISC_PK11_API_O@ \
+		app.@O@ dir.@O@ entropy.@O@ errno.@O@ errno2result.@O@ \
+		file.@O@ fsaccess.@O@ interfaceiter.@O@ \
+		keyboard.@O@ meminfo.@O@ \
+		net.@O@ os.@O@ resource.@O@ socket.@O@ stdio.@O@ stdtime.@O@ \
+		strerror.@O@ syslog.@O@ time.@O@
+
+# Alphabetically
+SRCS =		@ISC_IPV6_C@ @ISC_PK11_API_C@ \
+		app.c dir.c entropy.c errno.c errno2result.c \
+		file.c fsaccess.c interfaceiter.c keyboard.c meminfo.c \
+		net.c os.c resource.c socket.c stdio.c stdtime.c \
+		strerror.c syslog.c time.c
+
+SUBDIRS =	include
+TARGETS =	${OBJS}
+
+@BIND9_MAKE_RULES@
+
+interfaceiter.@O@: interfaceiter.c ifiter_ioctl.c ifiter_sysctl.c ifiter_getifaddrs.c
+
diff --git a/lib/isc/unix/app.c b/lib/isc/unix/app.c
new file mode 100644
index 0000000..7e5a0ee
--- /dev/null
+++ b/lib/isc/unix/app.c
@@ -0,0 +1,1038 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*! \file */
+
+#include <config.h>
+
+#include <sys/param.h>	/* Openserver 5.0.6A and FD_SETSIZE */
+#include <sys/types.h>
+
+#include <stddef.h>
+#include <inttypes.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+#include <signal.h>
+#include <sys/time.h>
+#ifdef HAVE_EPOLL
+#include <sys/epoll.h>
+#endif
+
+#include <isc/app.h>
+#include <isc/condition.h>
+#include <isc/mem.h>
+#include <isc/msgs.h>
+#include <isc/mutex.h>
+#include <isc/event.h>
+#include <isc/platform.h>
+#include <isc/strerror.h>
+#include <isc/string.h>
+#include <isc/task.h>
+#include <isc/time.h>
+#include <isc/util.h>
+
+#ifdef ISC_PLATFORM_USETHREADS
+#include <pthread.h>
+#endif
+
+/*%
+ * For BIND9 internal applications built with threads, we use a single app
+ * context and let multiple worker, I/O, timer threads do actual jobs.
+ * For other cases (including BIND9 built without threads) an app context acts
+ * as an event loop dispatching various events.
+ */
+#ifndef ISC_PLATFORM_USETHREADS
+#include "../timer_p.h"
+#include "../task_p.h"
+#include "socket_p.h"
+#endif /* ISC_PLATFORM_USETHREADS */
+
+#ifdef ISC_PLATFORM_USETHREADS
+static pthread_t		blockedthread;
+#endif /* ISC_PLATFORM_USETHREADS */
+
+/*%
+ * The following are intended for internal use (indicated by "isc__"
+ * prefix) but are not declared as static, allowing direct access from
+ * unit tests etc.
+ */
+isc_result_t isc__app_start(void);
+isc_result_t isc__app_ctxstart(isc_appctx_t *ctx);
+isc_result_t isc__app_onrun(isc_mem_t *mctx, isc_task_t *task,
+			    isc_taskaction_t action, void *arg);
+isc_result_t isc__app_ctxrun(isc_appctx_t *ctx);
+isc_result_t isc__app_run(void);
+isc_result_t isc__app_ctxshutdown(isc_appctx_t *ctx);
+isc_result_t isc__app_shutdown(void);
+isc_result_t isc__app_reload(void);
+isc_result_t isc__app_ctxsuspend(isc_appctx_t *ctx);
+void isc__app_ctxfinish(isc_appctx_t *ctx);
+void isc__app_finish(void);
+void isc__app_block(void);
+void isc__app_unblock(void);
+isc_result_t isc__appctx_create(isc_mem_t *mctx, isc_appctx_t **ctxp);
+void isc__appctx_destroy(isc_appctx_t **ctxp);
+void isc__appctx_settaskmgr(isc_appctx_t *ctx, isc_taskmgr_t *taskmgr);
+void isc__appctx_setsocketmgr(isc_appctx_t *ctx, isc_socketmgr_t *socketmgr);
+void isc__appctx_settimermgr(isc_appctx_t *ctx, isc_timermgr_t *timermgr);
+isc_result_t isc__app_ctxonrun(isc_appctx_t *ctx, isc_mem_t *mctx,
+			       isc_task_t *task, isc_taskaction_t action,
+			       void *arg);
+
+/*
+ * The application context of this module.  This implementation actually
+ * doesn't use it. (This may change in the future).
+ */
+#define APPCTX_MAGIC		ISC_MAGIC('A', 'p', 'c', 'x')
+#define VALID_APPCTX(c)		ISC_MAGIC_VALID(c, APPCTX_MAGIC)
+
+typedef struct isc__appctx {
+	isc_appctx_t		common;
+	isc_mem_t		*mctx;
+	isc_mutex_t		lock;
+	isc_eventlist_t		on_run;
+	bool		shutdown_requested;
+	bool		running;
+
+	/*!
+	 * We assume that 'want_shutdown' can be read and written atomically.
+	 */
+	bool		want_shutdown;
+	/*
+	 * We assume that 'want_reload' can be read and written atomically.
+	 */
+	bool		want_reload;
+
+	bool		blocked;
+
+	isc_taskmgr_t		*taskmgr;
+	isc_socketmgr_t		*socketmgr;
+	isc_timermgr_t		*timermgr;
+#ifdef ISC_PLATFORM_USETHREADS
+	isc_mutex_t		readylock;
+	isc_condition_t		ready;
+#endif /* ISC_PLATFORM_USETHREADS */
+} isc__appctx_t;
+
+static isc__appctx_t isc_g_appctx;
+
+static struct {
+	isc_appmethods_t methods;
+
+	/*%
+	 * The following are defined just for avoiding unused static functions.
+	 */
+	void *run, *shutdown, *start, *reload, *finish, *block, *unblock;
+} appmethods = {
+	{
+		isc__appctx_destroy,
+		isc__app_ctxstart,
+		isc__app_ctxrun,
+		isc__app_ctxsuspend,
+		isc__app_ctxshutdown,
+		isc__app_ctxfinish,
+		isc__appctx_settaskmgr,
+		isc__appctx_setsocketmgr,
+		isc__appctx_settimermgr,
+		isc__app_ctxonrun
+	},
+	(void *)isc__app_run,
+	(void *)isc__app_shutdown,
+	(void *)isc__app_start,
+	(void *)isc__app_reload,
+	(void *)isc__app_finish,
+	(void *)isc__app_block,
+	(void *)isc__app_unblock
+};
+
+#ifdef HAVE_LINUXTHREADS
+/*!
+ * Linux has sigwait(), but it appears to prevent signal handlers from
+ * running, even if they're not in the set being waited for.  This makes
+ * it impossible to get the default actions for SIGILL, SIGSEGV, etc.
+ * Instead of messing with it, we just use sigsuspend() instead.
+ */
+#undef HAVE_SIGWAIT
+/*!
+ * We need to remember which thread is the main thread...
+ */
+static pthread_t		main_thread;
+#endif
+
+#ifndef HAVE_SIGWAIT
+static void
+exit_action(int arg) {
+	UNUSED(arg);
+	isc_g_appctx.want_shutdown = true;
+}
+
+static void
+reload_action(int arg) {
+	UNUSED(arg);
+	isc_g_appctx.want_reload = true;
+}
+#endif
+
+static isc_result_t
+handle_signal(int sig, void (*handler)(int)) {
+	struct sigaction sa;
+	char strbuf[ISC_STRERRORSIZE];
+
+	memset(&sa, 0, sizeof(sa));
+	sa.sa_handler = handler;
+
+	if (sigfillset(&sa.sa_mask) != 0 ||
+	    sigaction(sig, &sa, NULL) < 0) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 isc_msgcat_get(isc_msgcat, ISC_MSGSET_APP,
+					       ISC_MSG_SIGNALSETUP,
+					       "handle_signal() %d setup: %s"),
+				 sig, strbuf);
+		return (ISC_R_UNEXPECTED);
+	}
+
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc__app_ctxstart(isc_appctx_t *ctx0) {
+	isc__appctx_t *ctx = (isc__appctx_t *)ctx0;
+	isc_result_t result;
+	int presult;
+	sigset_t sset;
+	char strbuf[ISC_STRERRORSIZE];
+
+	REQUIRE(VALID_APPCTX(ctx));
+
+	/*
+	 * Start an ISC library application.
+	 */
+
+#ifdef NEED_PTHREAD_INIT
+	/*
+	 * BSDI 3.1 seg faults in pthread_sigmask() if we don't do this.
+	 */
+	presult = pthread_init();
+	if (presult != 0) {
+		isc__strerror(presult, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 "isc_app_start() pthread_init: %s", strbuf);
+		return (ISC_R_UNEXPECTED);
+	}
+#endif
+
+#ifdef ISC_PLATFORM_USETHREADS
+#ifdef HAVE_LINUXTHREADS
+	main_thread = pthread_self();
+#endif /* HAVE_LINUXTHREADS */
+
+	result = isc_mutex_init(&ctx->readylock);
+	if (result != ISC_R_SUCCESS)
+		return (result);
+
+	result = isc_condition_init(&ctx->ready);
+	if (result != ISC_R_SUCCESS)
+		goto cleanup_rlock;
+
+	result = isc_mutex_init(&ctx->lock);
+	if (result != ISC_R_SUCCESS)
+		goto cleanup_rcond;
+#else /* ISC_PLATFORM_USETHREADS */
+	result = isc_mutex_init(&ctx->lock);
+	if (result != ISC_R_SUCCESS)
+		goto cleanup;
+#endif /* ISC_PLATFORM_USETHREADS */
+
+	ISC_LIST_INIT(ctx->on_run);
+
+	ctx->shutdown_requested = false;
+	ctx->running = false;
+	ctx->want_shutdown = false;
+	ctx->want_reload = false;
+	ctx->blocked = false;
+
+#ifndef HAVE_SIGWAIT
+	/*
+	 * Install do-nothing handlers for SIGINT and SIGTERM.
+	 *
+	 * We install them now because BSDI 3.1 won't block
+	 * the default actions, regardless of what we do with
+	 * pthread_sigmask().
+	 */
+	result = handle_signal(SIGINT, exit_action);
+	if (result != ISC_R_SUCCESS)
+		goto cleanup;
+	result = handle_signal(SIGTERM, exit_action);
+	if (result != ISC_R_SUCCESS)
+		goto cleanup;
+#endif
+
+	/*
+	 * Always ignore SIGPIPE.
+	 */
+	result = handle_signal(SIGPIPE, SIG_IGN);
+	if (result != ISC_R_SUCCESS)
+		goto cleanup;
+
+	/*
+	 * On Solaris 2, delivery of a signal whose action is SIG_IGN
+	 * will not cause sigwait() to return. We may have inherited
+	 * unexpected actions for SIGHUP, SIGINT, and SIGTERM from our parent
+	 * process (e.g, Solaris cron).  Set an action of SIG_DFL to make
+	 * sure sigwait() works as expected.  Only do this for SIGTERM and
+	 * SIGINT if we don't have sigwait(), since a different handler is
+	 * installed above.
+	 */
+	result = handle_signal(SIGHUP, SIG_DFL);
+	if (result != ISC_R_SUCCESS)
+		goto cleanup;
+
+#ifdef HAVE_SIGWAIT
+	result = handle_signal(SIGTERM, SIG_DFL);
+	if (result != ISC_R_SUCCESS)
+		goto cleanup;
+	result = handle_signal(SIGINT, SIG_DFL);
+	if (result != ISC_R_SUCCESS)
+		goto cleanup;
+#endif
+
+#ifdef ISC_PLATFORM_USETHREADS
+	/*
+	 * Block SIGHUP, SIGINT, SIGTERM.
+	 *
+	 * If isc_app_start() is called from the main thread before any other
+	 * threads have been created, then the pthread_sigmask() call below
+	 * will result in all threads having SIGHUP, SIGINT and SIGTERM
+	 * blocked by default, ensuring that only the thread that calls
+	 * sigwait() for them will get those signals.
+	 */
+	if (sigemptyset(&sset) != 0 ||
+	    sigaddset(&sset, SIGHUP) != 0 ||
+	    sigaddset(&sset, SIGINT) != 0 ||
+	    sigaddset(&sset, SIGTERM) != 0) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 "isc_app_start() sigsetops: %s", strbuf);
+		result = ISC_R_UNEXPECTED;
+		goto cleanup;
+	}
+	presult = pthread_sigmask(SIG_BLOCK, &sset, NULL);
+	if (presult != 0) {
+		isc__strerror(presult, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 "isc_app_start() pthread_sigmask: %s",
+				 strbuf);
+		result = ISC_R_UNEXPECTED;
+		goto cleanup;
+	}
+#else /* ISC_PLATFORM_USETHREADS */
+	/*
+	 * Unblock SIGHUP, SIGINT, SIGTERM.
+	 *
+	 * If we're not using threads, we need to make sure that SIGHUP,
+	 * SIGINT and SIGTERM are not inherited as blocked from the parent
+	 * process.
+	 */
+	if (sigemptyset(&sset) != 0 ||
+	    sigaddset(&sset, SIGHUP) != 0 ||
+	    sigaddset(&sset, SIGINT) != 0 ||
+	    sigaddset(&sset, SIGTERM) != 0) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 "isc_app_start() sigsetops: %s", strbuf);
+		result = ISC_R_UNEXPECTED;
+		goto cleanup;
+	}
+	presult = sigprocmask(SIG_UNBLOCK, &sset, NULL);
+	if (presult != 0) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 "isc_app_start() sigprocmask: %s", strbuf);
+		result = ISC_R_UNEXPECTED;
+		goto cleanup;
+	}
+#endif /* ISC_PLATFORM_USETHREADS */
+
+	return (ISC_R_SUCCESS);
+
+ cleanup:
+#ifdef ISC_PLATFORM_USETHREADS
+ cleanup_rcond:
+	(void)isc_condition_destroy(&ctx->ready);
+
+ cleanup_rlock:
+	(void)isc_mutex_destroy(&ctx->readylock);
+#endif /* ISC_PLATFORM_USETHREADS */
+	return (result);
+}
+
+isc_result_t
+isc__app_start(void) {
+	isc_g_appctx.common.impmagic = APPCTX_MAGIC;
+	isc_g_appctx.common.magic = ISCAPI_APPCTX_MAGIC;
+	isc_g_appctx.common.methods = &appmethods.methods;
+	isc_g_appctx.mctx = NULL;
+	/* The remaining members will be initialized in ctxstart() */
+
+	return (isc__app_ctxstart((isc_appctx_t *)&isc_g_appctx));
+}
+
+isc_result_t
+isc__app_onrun(isc_mem_t *mctx, isc_task_t *task, isc_taskaction_t action,
+	      void *arg)
+{
+	return (isc__app_ctxonrun((isc_appctx_t *)&isc_g_appctx, mctx,
+				  task, action, arg));
+}
+
+isc_result_t
+isc__app_ctxonrun(isc_appctx_t *ctx0, isc_mem_t *mctx, isc_task_t *task,
+		  isc_taskaction_t action, void *arg)
+{
+	isc__appctx_t *ctx = (isc__appctx_t *)ctx0;
+	isc_event_t *event;
+	isc_task_t *cloned_task = NULL;
+	isc_result_t result;
+
+	LOCK(&ctx->lock);
+
+	if (ctx->running) {
+		result = ISC_R_ALREADYRUNNING;
+		goto unlock;
+	}
+
+	/*
+	 * Note that we store the task to which we're going to send the event
+	 * in the event's "sender" field.
+	 */
+	isc_task_attach(task, &cloned_task);
+	event = isc_event_allocate(mctx, cloned_task, ISC_APPEVENT_SHUTDOWN,
+				   action, arg, sizeof(*event));
+	if (event == NULL) {
+		isc_task_detach(&cloned_task);
+		result = ISC_R_NOMEMORY;
+		goto unlock;
+	}
+
+	ISC_LIST_APPEND(ctx->on_run, event, ev_link);
+
+	result = ISC_R_SUCCESS;
+
+ unlock:
+	UNLOCK(&ctx->lock);
+
+	return (result);
+}
+
+#ifndef ISC_PLATFORM_USETHREADS
+/*!
+ * Event loop for nonthreaded programs.
+ */
+static isc_result_t
+evloop(isc__appctx_t *ctx) {
+	isc_result_t result;
+
+	while (!ctx->want_shutdown) {
+		int n;
+		isc_time_t when, now;
+		struct timeval tv, *tvp;
+		isc_socketwait_t *swait;
+		bool readytasks;
+		bool call_timer_dispatch = false;
+
+		/*
+		 * Check the reload (or suspend) case first for exiting the
+		 * loop as fast as possible in case:
+		 *   - the direct call to isc__taskmgr_dispatch() in
+		 *     isc__app_ctxrun() completes all the tasks so far,
+		 *   - there is thus currently no active task, and
+		 *   - there is a timer event
+		 */
+		if (ctx->want_reload) {
+			ctx->want_reload = false;
+			return (ISC_R_RELOAD);
+		}
+
+		readytasks = isc__taskmgr_ready(ctx->taskmgr);
+		if (readytasks) {
+			tv.tv_sec = 0;
+			tv.tv_usec = 0;
+			tvp = &tv;
+			call_timer_dispatch = true;
+		} else {
+			result = isc__timermgr_nextevent(ctx->timermgr, &when);
+			if (result != ISC_R_SUCCESS)
+				tvp = NULL;
+			else {
+				uint64_t us;
+
+				TIME_NOW(&now);
+				us = isc_time_microdiff(&when, &now);
+				if (us == 0)
+					call_timer_dispatch = true;
+				tv.tv_sec = us / 1000000;
+				tv.tv_usec = us % 1000000;
+				tvp = &tv;
+			}
+		}
+
+		swait = NULL;
+		n = isc__socketmgr_waitevents(ctx->socketmgr, tvp, &swait);
+
+		if (n == 0 || call_timer_dispatch) {
+			/*
+			 * We call isc__timermgr_dispatch() only when
+			 * necessary, in order to reduce overhead.  If the
+			 * select() call indicates a timeout, we need the
+			 * dispatch.  Even if not, if we set the 0-timeout
+			 * for the select() call, we need to check the timer
+			 * events.  In the 'readytasks' case, there may be no
+			 * timeout event actually, but there is no other way
+			 * to reduce the overhead.
+			 * Note that we do not have to worry about the case
+			 * where a new timer is inserted during the select()
+			 * call, since this loop only runs in the non-thread
+			 * mode.
+			 */
+			isc__timermgr_dispatch(ctx->timermgr);
+		}
+		if (n > 0)
+			(void)isc__socketmgr_dispatch(ctx->socketmgr, swait);
+		(void)isc__taskmgr_dispatch(ctx->taskmgr);
+	}
+	return (ISC_R_SUCCESS);
+}
+
+/*
+ * This is a gross hack to support waiting for condition
+ * variables in nonthreaded programs in a limited way;
+ * see lib/isc/nothreads/include/isc/condition.h.
+ * We implement isc_condition_wait() by entering the
+ * event loop recursively until the want_shutdown flag
+ * is set by isc_condition_signal().
+ */
+
+/*!
+ * \brief True if we are currently executing in the recursive
+ * event loop.
+ */
+static bool in_recursive_evloop = false;
+
+/*!
+ * \brief True if we are exiting the event loop as the result of
+ * a call to isc_condition_signal() rather than a shutdown
+ * or reload.
+ */
+static bool signalled = false;
+
+isc_result_t
+isc__nothread_wait_hack(isc_condition_t *cp, isc_mutex_t *mp) {
+	isc_result_t result;
+
+	UNUSED(cp);
+	UNUSED(mp);
+
+	INSIST(!in_recursive_evloop);
+	in_recursive_evloop = true;
+
+	INSIST(*mp == 1); /* Mutex must be locked on entry. */
+	--*mp;
+
+	result = evloop(&isc_g_appctx);
+	if (result == ISC_R_RELOAD)
+		isc_g_appctx.want_reload = true;
+	if (signalled) {
+		isc_g_appctx.want_shutdown = false;
+		signalled = false;
+	}
+
+	++*mp;
+	in_recursive_evloop = false;
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc__nothread_signal_hack(isc_condition_t *cp) {
+
+	UNUSED(cp);
+
+	INSIST(in_recursive_evloop);
+
+	isc_g_appctx.want_shutdown = true;
+	signalled = true;
+	return (ISC_R_SUCCESS);
+}
+#endif /* ISC_PLATFORM_USETHREADS */
+
+isc_result_t
+isc__app_ctxrun(isc_appctx_t *ctx0) {
+	isc__appctx_t *ctx = (isc__appctx_t *)ctx0;
+	int result;
+	isc_event_t *event, *next_event;
+	isc_task_t *task;
+#ifdef ISC_PLATFORM_USETHREADS
+	sigset_t sset;
+	char strbuf[ISC_STRERRORSIZE];
+#ifdef HAVE_SIGWAIT
+	int sig;
+#endif /* HAVE_SIGWAIT */
+#endif /* ISC_PLATFORM_USETHREADS */
+
+	REQUIRE(VALID_APPCTX(ctx));
+
+#ifdef HAVE_LINUXTHREADS
+	REQUIRE(main_thread == pthread_self());
+#endif
+
+	LOCK(&ctx->lock);
+
+	if (!ctx->running) {
+		ctx->running = true;
+
+		/*
+		 * Post any on-run events (in FIFO order).
+		 */
+		for (event = ISC_LIST_HEAD(ctx->on_run);
+		     event != NULL;
+		     event = next_event) {
+			next_event = ISC_LIST_NEXT(event, ev_link);
+			ISC_LIST_UNLINK(ctx->on_run, event, ev_link);
+			task = event->ev_sender;
+			event->ev_sender = NULL;
+			isc_task_sendanddetach(&task, &event);
+		}
+
+	}
+
+	UNLOCK(&ctx->lock);
+
+#ifndef ISC_PLATFORM_USETHREADS
+	if (isc_bind9 && ctx == &isc_g_appctx) {
+		result = handle_signal(SIGHUP, reload_action);
+		if (result != ISC_R_SUCCESS)
+			return (ISC_R_SUCCESS);
+	}
+
+	(void) isc__taskmgr_dispatch(ctx->taskmgr);
+	result = evloop(ctx);
+	return (result);
+#else /* ISC_PLATFORM_USETHREADS */
+	/*
+	 * BIND9 internal tools using multiple contexts do not
+	 * rely on signal.
+	 */
+	if (isc_bind9 && ctx != &isc_g_appctx)
+		return (ISC_R_SUCCESS);
+
+	/*
+	 * There is no danger if isc_app_shutdown() is called before we
+	 * wait for signals.  Signals are blocked, so any such signal will
+	 * simply be made pending and we will get it when we call
+	 * sigwait().
+	 */
+	while (!ctx->want_shutdown) {
+#ifdef HAVE_SIGWAIT
+		if (isc_bind9) {
+			/*
+			 * BIND9 internal; single context:
+			 * Wait for SIGHUP, SIGINT, or SIGTERM.
+			 */
+			if (sigemptyset(&sset) != 0 ||
+			    sigaddset(&sset, SIGHUP) != 0 ||
+			    sigaddset(&sset, SIGINT) != 0 ||
+			    sigaddset(&sset, SIGTERM) != 0) {
+				isc__strerror(errno, strbuf, sizeof(strbuf));
+				UNEXPECTED_ERROR(__FILE__, __LINE__,
+						 "isc_app_run() sigsetops: %s",
+						 strbuf);
+				return (ISC_R_UNEXPECTED);
+			}
+
+#ifndef HAVE_UNIXWARE_SIGWAIT
+			result = sigwait(&sset, &sig);
+			if (result == 0) {
+				if (sig == SIGINT || sig == SIGTERM)
+					ctx->want_shutdown = true;
+				else if (sig == SIGHUP)
+					ctx->want_reload = true;
+			}
+
+#else /* Using UnixWare sigwait semantics. */
+			sig = sigwait(&sset);
+			if (sig >= 0) {
+				if (sig == SIGINT || sig == SIGTERM)
+					ctx->want_shutdown = true;
+				else if (sig == SIGHUP)
+					ctx->want_reload = true;
+			}
+#endif /* HAVE_UNIXWARE_SIGWAIT */
+		} else {
+			/*
+			 * External, or BIND9 using multiple contexts:
+			 * wait until woken up.
+			 */
+			LOCK(&ctx->readylock);
+			if (ctx->want_shutdown) {
+				/* shutdown() won the race. */
+				UNLOCK(&ctx->readylock);
+				break;
+			}
+			if (!ctx->want_reload)
+				WAIT(&ctx->ready, &ctx->readylock);
+			UNLOCK(&ctx->readylock);
+		}
+#else  /* Don't have sigwait(). */
+		if (isc_bind9) {
+			/*
+			 * BIND9 internal; single context:
+			 * Install a signal handler for SIGHUP, then wait for
+			 * all signals.
+			 */
+			result = handle_signal(SIGHUP, reload_action);
+			if (result != ISC_R_SUCCESS)
+				return (ISC_R_SUCCESS);
+
+			if (sigemptyset(&sset) != 0) {
+				isc__strerror(errno, strbuf, sizeof(strbuf));
+				UNEXPECTED_ERROR(__FILE__, __LINE__,
+						 "isc_app_run() sigsetops: %s",
+						 strbuf);
+				return (ISC_R_UNEXPECTED);
+			}
+#ifdef HAVE_GPERFTOOLS_PROFILER
+			if (sigaddset(&sset, SIGALRM) != 0) {
+				isc__strerror(errno, strbuf, sizeof(strbuf));
+				UNEXPECTED_ERROR(__FILE__, __LINE__,
+						 "isc_app_run() sigsetops: %s",
+						 strbuf);
+				return (ISC_R_UNEXPECTED);
+			}
+#endif
+			(void)sigsuspend(&sset);
+		} else {
+			/*
+			 * External, or BIND9 using multiple contexts:
+			 * wait until woken up.
+			 */
+			LOCK(&ctx->readylock);
+			if (ctx->want_shutdown) {
+				/* shutdown() won the race. */
+				UNLOCK(&ctx->readylock);
+				break;
+			}
+			if (!ctx->want_reload)
+				WAIT(&ctx->ready, &ctx->readylock);
+			UNLOCK(&ctx->readylock);
+		}
+#endif /* HAVE_SIGWAIT */
+
+		if (ctx->want_reload) {
+			ctx->want_reload = false;
+			return (ISC_R_RELOAD);
+		}
+
+		if (ctx->want_shutdown && ctx->blocked)
+			exit(1);
+	}
+
+	return (ISC_R_SUCCESS);
+#endif /* ISC_PLATFORM_USETHREADS */
+}
+
+isc_result_t
+isc__app_run(void) {
+	return (isc__app_ctxrun((isc_appctx_t *)&isc_g_appctx));
+}
+
+isc_result_t
+isc__app_ctxshutdown(isc_appctx_t *ctx0) {
+	isc__appctx_t *ctx = (isc__appctx_t *)ctx0;
+	bool want_kill = true;
+#ifdef ISC_PLATFORM_USETHREADS
+	char strbuf[ISC_STRERRORSIZE];
+#endif /* ISC_PLATFORM_USETHREADS */
+
+	REQUIRE(VALID_APPCTX(ctx));
+
+	LOCK(&ctx->lock);
+
+	REQUIRE(ctx->running);
+
+	if (ctx->shutdown_requested)
+		want_kill = false;
+	else
+		ctx->shutdown_requested = true;
+
+	UNLOCK(&ctx->lock);
+
+	if (want_kill) {
+		if (isc_bind9 && ctx != &isc_g_appctx)
+			/* BIND9 internal, but using multiple contexts */
+			ctx->want_shutdown = true;
+		else {
+#ifndef ISC_PLATFORM_USETHREADS
+			ctx->want_shutdown = true;
+#else /* ISC_PLATFORM_USETHREADS */
+#ifdef HAVE_LINUXTHREADS
+			if (isc_bind9) {
+				/* BIND9 internal, single context */
+				int result;
+
+				result = pthread_kill(main_thread, SIGTERM);
+				if (result != 0) {
+					isc__strerror(result,
+						      strbuf, sizeof(strbuf));
+					UNEXPECTED_ERROR(__FILE__, __LINE__,
+							 "isc_app_shutdown() "
+							 "pthread_kill: %s",
+							 strbuf);
+					return (ISC_R_UNEXPECTED);
+				}
+			}
+#else
+			if (isc_bind9) {
+				/* BIND9 internal, single context */
+				if (kill(getpid(), SIGTERM) < 0) {
+					isc__strerror(errno,
+						      strbuf, sizeof(strbuf));
+					UNEXPECTED_ERROR(__FILE__, __LINE__,
+							 "isc_app_shutdown() "
+							 "kill: %s", strbuf);
+					return (ISC_R_UNEXPECTED);
+				}
+			}
+#endif /* HAVE_LINUXTHREADS */
+			else {
+				/* External, multiple contexts */
+				LOCK(&ctx->readylock);
+				ctx->want_shutdown = true;
+				UNLOCK(&ctx->readylock);
+				SIGNAL(&ctx->ready);
+			}
+#endif /* ISC_PLATFORM_USETHREADS */
+		}
+	}
+
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc__app_shutdown(void) {
+	return (isc__app_ctxshutdown((isc_appctx_t *)&isc_g_appctx));
+}
+
+isc_result_t
+isc__app_ctxsuspend(isc_appctx_t *ctx0) {
+	isc__appctx_t *ctx = (isc__appctx_t *)ctx0;
+	bool want_kill = true;
+#ifdef ISC_PLATFORM_USETHREADS
+	char strbuf[ISC_STRERRORSIZE];
+#endif
+
+	REQUIRE(VALID_APPCTX(ctx));
+
+	LOCK(&ctx->lock);
+
+	REQUIRE(ctx->running);
+
+	/*
+	 * Don't send the reload signal if we're shutting down.
+	 */
+	if (ctx->shutdown_requested)
+		want_kill = false;
+
+	UNLOCK(&ctx->lock);
+
+	if (want_kill) {
+		if (isc_bind9 && ctx != &isc_g_appctx)
+			/* BIND9 internal, but using multiple contexts */
+			ctx->want_reload = true;
+		else {
+#ifndef ISC_PLATFORM_USETHREADS
+			ctx->want_reload = true;
+#else /* ISC_PLATFORM_USETHREADS */
+#ifdef HAVE_LINUXTHREADS
+			if (isc_bind9) {
+				/* BIND9 internal, single context */
+				int result;
+
+				result = pthread_kill(main_thread, SIGHUP);
+				if (result != 0) {
+					isc__strerror(result,
+						      strbuf, sizeof(strbuf));
+					UNEXPECTED_ERROR(__FILE__, __LINE__,
+							 "isc_app_reload() "
+							 "pthread_kill: %s",
+							 strbuf);
+					return (ISC_R_UNEXPECTED);
+				}
+			}
+#else
+			if (isc_bind9) {
+				/* BIND9 internal, single context */
+				if (kill(getpid(), SIGHUP) < 0) {
+					isc__strerror(errno,
+						      strbuf, sizeof(strbuf));
+					UNEXPECTED_ERROR(__FILE__, __LINE__,
+							 "isc_app_reload() "
+							 "kill: %s", strbuf);
+					return (ISC_R_UNEXPECTED);
+				}
+			}
+#endif /* HAVE_LINUXTHREADS */
+			else {
+				/* External, multiple contexts */
+				LOCK(&ctx->readylock);
+				ctx->want_reload = true;
+				UNLOCK(&ctx->readylock);
+				SIGNAL(&ctx->ready);
+			}
+#endif /* ISC_PLATFORM_USETHREADS */
+		}
+	}
+
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc__app_reload(void) {
+	return (isc__app_ctxsuspend((isc_appctx_t *)&isc_g_appctx));
+}
+
+void
+isc__app_ctxfinish(isc_appctx_t *ctx0) {
+	isc__appctx_t *ctx = (isc__appctx_t *)ctx0;
+
+	REQUIRE(VALID_APPCTX(ctx));
+
+	DESTROYLOCK(&ctx->lock);
+}
+
+void
+isc__app_finish(void) {
+	isc__app_ctxfinish((isc_appctx_t *)&isc_g_appctx);
+}
+
+void
+isc__app_block(void) {
+#ifdef ISC_PLATFORM_USETHREADS
+	sigset_t sset;
+#endif /* ISC_PLATFORM_USETHREADS */
+	REQUIRE(isc_g_appctx.running);
+	REQUIRE(!isc_g_appctx.blocked);
+
+	isc_g_appctx.blocked = true;
+#ifdef ISC_PLATFORM_USETHREADS
+	blockedthread = pthread_self();
+	RUNTIME_CHECK(sigemptyset(&sset) == 0 &&
+		      sigaddset(&sset, SIGINT) == 0 &&
+		      sigaddset(&sset, SIGTERM) == 0);
+	RUNTIME_CHECK(pthread_sigmask(SIG_UNBLOCK, &sset, NULL) == 0);
+#endif /* ISC_PLATFORM_USETHREADS */
+}
+
+void
+isc__app_unblock(void) {
+#ifdef ISC_PLATFORM_USETHREADS
+	sigset_t sset;
+#endif /* ISC_PLATFORM_USETHREADS */
+
+	REQUIRE(isc_g_appctx.running);
+	REQUIRE(isc_g_appctx.blocked);
+
+	isc_g_appctx.blocked = false;
+
+#ifdef ISC_PLATFORM_USETHREADS
+	REQUIRE(blockedthread == pthread_self());
+
+	RUNTIME_CHECK(sigemptyset(&sset) == 0 &&
+		      sigaddset(&sset, SIGINT) == 0 &&
+		      sigaddset(&sset, SIGTERM) == 0);
+	RUNTIME_CHECK(pthread_sigmask(SIG_BLOCK, &sset, NULL) == 0);
+#endif /* ISC_PLATFORM_USETHREADS */
+}
+
+isc_result_t
+isc__appctx_create(isc_mem_t *mctx, isc_appctx_t **ctxp) {
+	isc__appctx_t *ctx;
+
+	REQUIRE(mctx != NULL);
+	REQUIRE(ctxp != NULL && *ctxp == NULL);
+
+	ctx = isc_mem_get(mctx, sizeof(*ctx));
+	if (ctx == NULL)
+		return (ISC_R_NOMEMORY);
+
+	ctx->common.impmagic = APPCTX_MAGIC;
+	ctx->common.magic = ISCAPI_APPCTX_MAGIC;
+	ctx->common.methods = &appmethods.methods;
+
+	ctx->mctx = NULL;
+	isc_mem_attach(mctx, &ctx->mctx);
+
+	ctx->taskmgr = NULL;
+	ctx->socketmgr = NULL;
+	ctx->timermgr = NULL;
+
+	*ctxp = (isc_appctx_t *)ctx;
+
+	return (ISC_R_SUCCESS);
+}
+
+void
+isc__appctx_destroy(isc_appctx_t **ctxp) {
+	isc__appctx_t *ctx;
+
+	REQUIRE(ctxp != NULL);
+	ctx = (isc__appctx_t *)*ctxp;
+	REQUIRE(VALID_APPCTX(ctx));
+
+	isc_mem_putanddetach(&ctx->mctx, ctx, sizeof(*ctx));
+
+	*ctxp = NULL;
+}
+
+void
+isc__appctx_settaskmgr(isc_appctx_t *ctx0, isc_taskmgr_t *taskmgr) {
+	isc__appctx_t *ctx = (isc__appctx_t *)ctx0;
+
+	REQUIRE(VALID_APPCTX(ctx));
+
+	ctx->taskmgr = taskmgr;
+}
+
+void
+isc__appctx_setsocketmgr(isc_appctx_t *ctx0, isc_socketmgr_t *socketmgr) {
+	isc__appctx_t *ctx = (isc__appctx_t *)ctx0;
+
+	REQUIRE(VALID_APPCTX(ctx));
+
+	ctx->socketmgr = socketmgr;
+}
+
+void
+isc__appctx_settimermgr(isc_appctx_t *ctx0, isc_timermgr_t *timermgr) {
+	isc__appctx_t *ctx = (isc__appctx_t *)ctx0;
+
+	REQUIRE(VALID_APPCTX(ctx));
+
+	ctx->timermgr = timermgr;
+}
+
+isc_result_t
+isc__app_register(void) {
+	return (isc_app_register(isc__appctx_create));
+}
+
+#include "../app_api.c"
diff --git a/lib/isc/unix/dir.c b/lib/isc/unix/dir.c
new file mode 100644
index 0000000..dae0e66
--- /dev/null
+++ b/lib/isc/unix/dir.c
@@ -0,0 +1,259 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*! \file */
+
+#include <config.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <ctype.h>
+#include <errno.h>
+#include <unistd.h>
+
+#include <isc/dir.h>
+#include <isc/magic.h>
+#include <isc/netdb.h>
+#include <isc/print.h>
+#include <isc/string.h>
+#include <isc/util.h>
+
+#include "errno2result.h"
+
+#define ISC_DIR_MAGIC		ISC_MAGIC('D', 'I', 'R', '*')
+#define VALID_DIR(dir)		ISC_MAGIC_VALID(dir, ISC_DIR_MAGIC)
+
+void
+isc_dir_init(isc_dir_t *dir) {
+	REQUIRE(dir != NULL);
+
+	dir->entry.name[0] = '\0';
+	dir->entry.length = 0;
+
+	dir->handle = NULL;
+
+	dir->magic = ISC_DIR_MAGIC;
+}
+
+/*!
+ * \brief Allocate workspace and open directory stream. If either one fails,
+ * NULL will be returned.
+ */
+isc_result_t
+isc_dir_open(isc_dir_t *dir, const char *dirname) {
+	char *p;
+	isc_result_t result = ISC_R_SUCCESS;
+
+	REQUIRE(VALID_DIR(dir));
+	REQUIRE(dirname != NULL);
+
+	/*
+	 * Copy directory name.  Need to have enough space for the name,
+	 * a possible path separator, the wildcard, and the final NUL.
+	 */
+	if (strlen(dirname) + 3 > sizeof(dir->dirname)) {
+		/* XXXDCL ? */
+		return (ISC_R_NOSPACE);
+	}
+	strlcpy(dir->dirname, dirname, sizeof(dir->dirname));
+
+	/*
+	 * Append path separator, if needed, and "*".
+	 */
+	p = dir->dirname + strlen(dir->dirname);
+	if (dir->dirname < p && *(p - 1) != '/')
+		*p++ = '/';
+	*p++ = '*';
+	*p = '\0';
+
+	/*
+	 * Open stream.
+	 */
+	dir->handle = opendir(dirname);
+
+	if (dir->handle == NULL) {
+		return (isc__errno2result(errno));
+	}
+
+	return (result);
+}
+
+/*!
+ * \brief Return previously retrieved file or get next one.
+
+ * Unix's dirent has
+ * separate open and read functions, but the Win32 and DOS interfaces open
+ * the dir stream and reads the first file in one operation.
+ */
+isc_result_t
+isc_dir_read(isc_dir_t *dir) {
+	struct dirent *entry;
+
+	REQUIRE(VALID_DIR(dir) && dir->handle != NULL);
+
+	/*
+	 * Fetch next file in directory.
+	 */
+	entry = readdir(dir->handle);
+
+	if (entry == NULL)
+		return (ISC_R_NOMORE);
+
+	/*
+	 * Make sure that the space for the name is long enough.
+	 */
+	if (sizeof(dir->entry.name) <= strlen(entry->d_name))
+		return (ISC_R_UNEXPECTED);
+
+	strlcpy(dir->entry.name, entry->d_name, sizeof(dir->entry.name));
+
+	/*
+	 * Some dirents have d_namlen, but it is not portable.
+	 */
+	dir->entry.length = strlen(entry->d_name);
+
+	return (ISC_R_SUCCESS);
+}
+
+/*!
+ * \brief Close directory stream.
+ */
+void
+isc_dir_close(isc_dir_t *dir) {
+       REQUIRE(VALID_DIR(dir) && dir->handle != NULL);
+
+       (void)closedir(dir->handle);
+       dir->handle = NULL;
+}
+
+/*!
+ * \brief Reposition directory stream at start.
+ */
+isc_result_t
+isc_dir_reset(isc_dir_t *dir) {
+	REQUIRE(VALID_DIR(dir) && dir->handle != NULL);
+
+	rewinddir(dir->handle);
+
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc_dir_chdir(const char *dirname) {
+	/*!
+	 * \brief Change the current directory to 'dirname'.
+	 */
+
+	REQUIRE(dirname != NULL);
+
+	if (chdir(dirname) < 0)
+		return (isc__errno2result(errno));
+
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc_dir_chroot(const char *dirname) {
+#ifdef HAVE_CHROOT
+	void *tmp;
+#endif
+
+	REQUIRE(dirname != NULL);
+
+#ifdef HAVE_CHROOT
+	/*
+	 * Try to use getservbyname and getprotobyname before chroot.
+	 * If WKS records are used in a zone under chroot, Name Service Switch
+	 * may fail to load library in chroot.
+	 * Do not report errors if it fails, we do not need any result now.
+	 */
+	tmp = getprotobyname("udp");
+	if (tmp != NULL)
+		(void) getservbyname("domain", "udp");
+
+	if (chroot(dirname) < 0 || chdir("/") < 0)
+		return (isc__errno2result(errno));
+
+	return (ISC_R_SUCCESS);
+#else
+	return (ISC_R_NOTIMPLEMENTED);
+#endif
+}
+
+isc_result_t
+isc_dir_createunique(char *templet) {
+	isc_result_t result;
+	char *x;
+	char *p;
+	int i;
+	int pid;
+
+	REQUIRE(templet != NULL);
+
+	/*!
+	 * \brief mkdtemp is not portable, so this emulates it.
+	 */
+
+	pid = getpid();
+
+	/*
+	 * Replace trailing Xs with the process-id, zero-filled.
+	 */
+	for (x = templet + strlen(templet) - 1; *x == 'X' && x >= templet;
+	     x--, pid /= 10)
+		*x = pid % 10 + '0';
+
+	x++;			/* Set x to start of ex-Xs. */
+
+	do {
+		i = mkdir(templet, 0700);
+		if (i == 0 || errno != EEXIST)
+			break;
+
+		/*
+		 * The BSD algorithm.
+		 */
+		p = x;
+		while (*p != '\0') {
+			if (isdigit(*p & 0xff))
+				*p = 'a';
+			else if (*p != 'z')
+				++*p;
+			else {
+				/*
+				 * Reset character and move to next.
+				 */
+				*p++ = 'a';
+				continue;
+			}
+
+			break;
+		}
+
+		if (*p == '\0') {
+			/*
+			 * Tried all combinations.  errno should already
+			 * be EEXIST, but ensure it is anyway for
+			 * isc__errno2result().
+			 */
+			errno = EEXIST;
+			break;
+		}
+	} while (1);
+
+	if (i == -1)
+		result = isc__errno2result(errno);
+	else
+		result = ISC_R_SUCCESS;
+
+	return (result);
+}
diff --git a/lib/isc/unix/entropy.c b/lib/isc/unix/entropy.c
new file mode 100644
index 0000000..18eb938
--- /dev/null
+++ b/lib/isc/unix/entropy.c
@@ -0,0 +1,603 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/* \file unix/entropy.c
+ * \brief
+ * This is the system dependent part of the ISC entropy API.
+ */
+
+#include <config.h>
+
+#include <stdbool.h>
+
+#include <sys/param.h>	/* Openserver 5.0.6A and FD_SETSIZE */
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+
+#ifdef HAVE_NANOSLEEP
+#include <time.h>
+#endif
+#include <unistd.h>
+
+#include <isc/platform.h>
+#include <isc/print.h>
+#include <isc/strerror.h>
+#include <isc/string.h>
+
+#ifdef ISC_PLATFORM_NEEDSYSSELECTH
+#include <sys/select.h>
+#endif
+
+#include "errno2result.h"
+
+/*%
+ * There is only one variable in the entropy data structures that is not
+ * system independent, but pulling the structure that uses it into this file
+ * ultimately means pulling several other independent structures here also to
+ * resolve their interdependencies.  Thus only the problem variable's type
+ * is defined here.
+ */
+#define FILESOURCE_HANDLE_TYPE	int
+
+typedef struct {
+	int	handle;
+	enum	{
+		isc_usocketsource_disconnected,
+		isc_usocketsource_connecting,
+		isc_usocketsource_connected,
+		isc_usocketsource_ndesired,
+		isc_usocketsource_wrote,
+		isc_usocketsource_reading
+	} status;
+	size_t	sz_to_recv;
+} isc_entropyusocketsource_t;
+
+#include "../entropy.c"
+
+static unsigned int
+get_from_filesource(isc_entropysource_t *source, uint32_t desired) {
+	isc_entropy_t *ent = source->ent;
+	unsigned char buf[128];
+	int fd = source->sources.file.handle;
+	ssize_t n, ndesired;
+	unsigned int added;
+
+	if (source->bad)
+		return (0);
+
+	desired = desired / 8 + (((desired & 0x07) > 0) ? 1 : 0);
+
+	added = 0;
+	while (desired > 0) {
+		ndesired = ISC_MIN(desired, sizeof(buf));
+		n = read(fd, buf, ndesired);
+		if (n < 0) {
+			if (errno == EAGAIN || errno == EINTR)
+				goto out;
+			goto err;
+		}
+		if (n == 0)
+			goto err;
+
+		entropypool_adddata(ent, buf, n, n * 8);
+		added += n * 8;
+		desired -= n;
+	}
+	goto out;
+
+ err:
+	(void)close(fd);
+	source->sources.file.handle = -1;
+	source->bad = true;
+
+ out:
+	return (added);
+}
+
+static unsigned int
+get_from_usocketsource(isc_entropysource_t *source, uint32_t desired) {
+	isc_entropy_t *ent = source->ent;
+	unsigned char buf[128];
+	int fd = source->sources.usocket.handle;
+	ssize_t n = 0, ndesired;
+	unsigned int added;
+	size_t sz_to_recv = source->sources.usocket.sz_to_recv;
+
+	if (source->bad)
+		return (0);
+
+	desired = desired / 8 + (((desired & 0x07) > 0) ? 1 : 0);
+
+	added = 0;
+	while (desired > 0) {
+		ndesired = ISC_MIN(desired, sizeof(buf));
+ eagain_loop:
+
+		switch ( source->sources.usocket.status ) {
+		case isc_usocketsource_ndesired:
+			buf[0] = ndesired;
+			if ((n = sendto(fd, buf, 1, 0, NULL, 0)) < 0) {
+				if (errno == EWOULDBLOCK || errno == EINTR ||
+				    errno == ECONNRESET)
+					goto out;
+				goto err;
+			}
+			INSIST(n == 1);
+			source->sources.usocket.status =
+						isc_usocketsource_wrote;
+			goto eagain_loop;
+
+		case isc_usocketsource_connecting:
+		case isc_usocketsource_connected:
+			buf[0] = 1;
+			buf[1] = ndesired;
+			if ((n = sendto(fd, buf, 2, 0, NULL, 0)) < 0) {
+				if (errno == EWOULDBLOCK || errno == EINTR ||
+				    errno == ECONNRESET)
+					goto out;
+				goto err;
+			}
+			if (n == 1) {
+				source->sources.usocket.status =
+					isc_usocketsource_ndesired;
+				goto eagain_loop;
+			}
+			INSIST(n == 2);
+			source->sources.usocket.status =
+						isc_usocketsource_wrote;
+			/* FALLTHROUGH */
+
+		case isc_usocketsource_wrote:
+			if (recvfrom(fd, buf, 1, 0, NULL, NULL) != 1) {
+				if (errno == EAGAIN) {
+					/*
+					 * The problem of EAGAIN (try again
+					 * later) is a major issue on HP-UX.
+					 * Solaris actually tries the recvfrom
+					 * call again, while HP-UX just dies.
+					 * This code is an attempt to let the
+					 * entropy pool fill back up (at least
+					 * that's what I think the problem is.)
+					 * We go to eagain_loop because if we
+					 * just "break", then the "desired"
+					 * amount gets borked.
+					 */
+#ifdef HAVE_NANOSLEEP
+					struct timespec ts;
+
+					ts.tv_sec = 0;
+					ts.tv_nsec = 1000000;
+					nanosleep(&ts, NULL);
+#else
+					usleep(1000);
+#endif
+					goto eagain_loop;
+				}
+				if (errno == EWOULDBLOCK || errno == EINTR)
+					goto out;
+				goto err;
+			}
+			source->sources.usocket.status =
+					isc_usocketsource_reading;
+			sz_to_recv = buf[0];
+			source->sources.usocket.sz_to_recv = sz_to_recv;
+			if (sz_to_recv > sizeof(buf))
+				goto err;
+			/* FALLTHROUGH */
+
+		case isc_usocketsource_reading:
+			if (sz_to_recv != 0U) {
+				n = recv(fd, buf, sz_to_recv, 0);
+				if (n < 0) {
+					if (errno == EWOULDBLOCK ||
+					    errno == EINTR)
+						goto out;
+					goto err;
+				}
+			} else
+				n = 0;
+			break;
+
+		default:
+			goto err;
+		}
+
+		if ((size_t)n != sz_to_recv)
+			source->sources.usocket.sz_to_recv -= n;
+		else
+			source->sources.usocket.status =
+				isc_usocketsource_connected;
+
+		if (n == 0)
+			goto out;
+
+		entropypool_adddata(ent, buf, n, n * 8);
+		added += n * 8;
+		desired -= n;
+	}
+	goto out;
+
+ err:
+	close(fd);
+	source->bad = true;
+	source->sources.usocket.status = isc_usocketsource_disconnected;
+	source->sources.usocket.handle = -1;
+
+ out:
+	return (added);
+}
+
+/*
+ * Poll each source, trying to get data from it to stuff into the entropy
+ * pool.
+ */
+static void
+fillpool(isc_entropy_t *ent, unsigned int desired, bool blocking) {
+	unsigned int added;
+	unsigned int remaining;
+	unsigned int needed;
+	unsigned int nsource;
+	isc_entropysource_t *source;
+
+	REQUIRE(VALID_ENTROPY(ent));
+
+	needed = desired;
+
+	/*
+	 * This logic is a little strange, so an explanation is in order.
+	 *
+	 * If needed is 0, it means we are being asked to "fill to whatever
+	 * we think is best."  This means that if we have at least a
+	 * partially full pool (say, > 1/4th of the pool) we probably don't
+	 * need to add anything.
+	 *
+	 * Also, we will check to see if the "pseudo" count is too high.
+	 * If it is, try to mix in better data.  Too high is currently
+	 * defined as 1/4th of the pool.
+	 *
+	 * Next, if we are asked to add a specific bit of entropy, make
+	 * certain that we will do so.  Clamp how much we try to add to
+	 * (DIGEST_SIZE * 8 < needed < POOLBITS - entropy).
+	 *
+	 * Note that if we are in a blocking mode, we will only try to
+	 * get as much data as we need, not as much as we might want
+	 * to build up.
+	 */
+	if (needed == 0) {
+		REQUIRE(!blocking);
+
+		if ((ent->pool.entropy >= RND_POOLBITS / 4)
+		    && (ent->pool.pseudo <= RND_POOLBITS / 4))
+			return;
+
+		needed = THRESHOLD_BITS * 4;
+	} else {
+		needed = ISC_MAX(needed, THRESHOLD_BITS);
+		needed = ISC_MIN(needed, RND_POOLBITS);
+	}
+
+	/*
+	 * In any case, clamp how much we need to how much we can add.
+	 */
+	needed = ISC_MIN(needed, RND_POOLBITS - ent->pool.entropy);
+
+	/*
+	 * But wait!  If we're not yet initialized, we need at least
+	 *	THRESHOLD_BITS
+	 * of randomness.
+	 */
+	if (ent->initialized < THRESHOLD_BITS)
+		needed = ISC_MAX(needed, THRESHOLD_BITS - ent->initialized);
+
+	/*
+	 * Poll each file source to see if we can read anything useful from
+	 * it.  XXXMLG When where are multiple sources, we should keep a
+	 * record of which one we last used so we can start from it (or the
+	 * next one) to avoid letting some sources build up entropy while
+	 * others are always drained.
+	 */
+
+	added = 0;
+	remaining = needed;
+	if (ent->nextsource == NULL) {
+		ent->nextsource = ISC_LIST_HEAD(ent->sources);
+		if (ent->nextsource == NULL)
+			return;
+	}
+	source = ent->nextsource;
+ again_file:
+	for (nsource = 0; nsource < ent->nsources; nsource++) {
+		unsigned int got;
+
+		if (remaining == 0)
+			break;
+
+		got = 0;
+
+		switch ( source->type ) {
+		case ENTROPY_SOURCETYPE_FILE:
+			got = get_from_filesource(source, remaining);
+			break;
+
+		case ENTROPY_SOURCETYPE_USOCKET:
+			got = get_from_usocketsource(source, remaining);
+			break;
+		}
+
+		added += got;
+
+		remaining -= ISC_MIN(remaining, got);
+
+		source = ISC_LIST_NEXT(source, link);
+		if (source == NULL)
+			source = ISC_LIST_HEAD(ent->sources);
+	}
+	ent->nextsource = source;
+
+	if (blocking && remaining != 0) {
+		int fds;
+
+		fds = wait_for_sources(ent);
+		if (fds > 0)
+			goto again_file;
+	}
+
+	/*
+	 * Here, if there are bits remaining to be had and we can block,
+	 * check to see if we have a callback source.  If so, call them.
+	 */
+	source = ISC_LIST_HEAD(ent->sources);
+	while ((remaining != 0) && (source != NULL)) {
+		unsigned int got;
+
+		got = 0;
+
+		if (source->type == ENTROPY_SOURCETYPE_CALLBACK)
+			got = get_from_callback(source, remaining, blocking);
+
+		added += got;
+		remaining -= ISC_MIN(remaining, got);
+
+		if (added >= needed)
+			break;
+
+		source = ISC_LIST_NEXT(source, link);
+	}
+
+	/*
+	 * Mark as initialized if we've added enough data.
+	 */
+	if (ent->initialized < THRESHOLD_BITS)
+		ent->initialized += added;
+}
+
+static int
+wait_for_sources(isc_entropy_t *ent) {
+	isc_entropysource_t *source;
+	int maxfd, fd;
+	int cc;
+	fd_set reads;
+	fd_set writes;
+
+	maxfd = -1;
+	FD_ZERO(&reads);
+	FD_ZERO(&writes);
+
+	source = ISC_LIST_HEAD(ent->sources);
+	while (source != NULL) {
+		if (source->type == ENTROPY_SOURCETYPE_FILE) {
+			fd = source->sources.file.handle;
+			if (fd >= 0) {
+				maxfd = ISC_MAX(maxfd, fd);
+				FD_SET(fd, &reads);
+			}
+		}
+		if (source->type == ENTROPY_SOURCETYPE_USOCKET) {
+			fd = source->sources.usocket.handle;
+			if (fd >= 0) {
+				switch (source->sources.usocket.status) {
+				case isc_usocketsource_disconnected:
+					break;
+				case isc_usocketsource_connecting:
+				case isc_usocketsource_connected:
+				case isc_usocketsource_ndesired:
+					maxfd = ISC_MAX(maxfd, fd);
+					FD_SET(fd, &writes);
+					break;
+				case isc_usocketsource_wrote:
+				case isc_usocketsource_reading:
+					maxfd = ISC_MAX(maxfd, fd);
+					FD_SET(fd, &reads);
+					break;
+				}
+			}
+		}
+		source = ISC_LIST_NEXT(source, link);
+	}
+
+	if (maxfd < 0)
+		return (-1);
+
+	cc = select(maxfd + 1, &reads, &writes, NULL, NULL);
+	if (cc < 0)
+		return (-1);
+
+	return (cc);
+}
+
+static void
+destroyfilesource(isc_entropyfilesource_t *source) {
+	(void)close(source->handle);
+}
+
+static void
+destroyusocketsource(isc_entropyusocketsource_t *source) {
+	close(source->handle);
+}
+
+/*
+ * Make a fd non-blocking
+ */
+static isc_result_t
+make_nonblock(int fd) {
+	int ret;
+	char strbuf[ISC_STRERRORSIZE];
+#ifdef USE_FIONBIO_IOCTL
+	int on = 1;
+#else
+	int flags;
+#endif
+
+#ifdef USE_FIONBIO_IOCTL
+	ret = ioctl(fd, FIONBIO, (char *)&on);
+#else
+	flags = fcntl(fd, F_GETFL, 0);
+	flags |= PORT_NONBLOCK;
+	ret = fcntl(fd, F_SETFL, flags);
+#endif
+
+	if (ret == -1) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+#ifdef USE_FIONBIO_IOCTL
+				 "ioctl(%d, FIONBIO, &on): %s", fd,
+#else
+				 "fcntl(%d, F_SETFL, %d): %s", fd, flags,
+#endif
+				 strbuf);
+
+		return (ISC_R_UNEXPECTED);
+	}
+
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc_entropy_createfilesource(isc_entropy_t *ent, const char *fname) {
+	int fd;
+	struct stat _stat;
+	bool is_usocket = false;
+	bool is_connected = false;
+	isc_result_t ret;
+	isc_entropysource_t *source;
+
+	REQUIRE(VALID_ENTROPY(ent));
+	REQUIRE(fname != NULL);
+
+	LOCK(&ent->lock);
+
+	if (stat(fname, &_stat) < 0) {
+		ret = isc__errno2result(errno);
+		goto errout;
+	}
+	/*
+	 * Solaris 2.5.1 does not have support for sockets (S_IFSOCK),
+	 * but it does return type S_IFIFO (the OS believes that
+	 * the socket is a fifo).  This may be an issue if we tell
+	 * the program to look at an actual FIFO as its source of
+	 * entropy.
+	 */
+#if defined(S_ISSOCK)
+	if (S_ISSOCK(_stat.st_mode))
+		is_usocket = true;
+#endif
+#if defined(S_ISFIFO) && defined(sun)
+	if (S_ISFIFO(_stat.st_mode))
+		is_usocket = true;
+#endif
+	if (is_usocket)
+		fd = socket(PF_UNIX, SOCK_STREAM, 0);
+	else
+		fd = open(fname, O_RDONLY | PORT_NONBLOCK, 0);
+
+	if (fd < 0) {
+		ret = isc__errno2result(errno);
+		goto errout;
+	}
+
+	ret = make_nonblock(fd);
+	if (ret != ISC_R_SUCCESS)
+		goto closefd;
+
+	if (is_usocket) {
+		struct sockaddr_un sname;
+
+		memset(&sname, 0, sizeof(sname));
+		sname.sun_family = AF_UNIX;
+		strlcpy(sname.sun_path, fname, sizeof(sname.sun_path));
+#ifdef ISC_PLATFORM_HAVESALEN
+#if !defined(SUN_LEN)
+#define SUN_LEN(su) \
+	(sizeof(*(su)) - sizeof((su)->sun_path) + strlen((su)->sun_path))
+#endif
+		sname.sun_len = SUN_LEN(&sname);
+#endif
+
+		if (connect(fd, (struct sockaddr *) &sname,
+			    sizeof(struct sockaddr_un)) < 0) {
+			if (errno != EINPROGRESS) {
+				ret = isc__errno2result(errno);
+				goto closefd;
+			}
+		} else
+			is_connected = true;
+	}
+
+	source = isc_mem_get(ent->mctx, sizeof(isc_entropysource_t));
+	if (source == NULL) {
+		ret = ISC_R_NOMEMORY;
+		goto closefd;
+	}
+
+	/*
+	 * From here down, no failures can occur.
+	 */
+	source->magic = SOURCE_MAGIC;
+	source->ent = ent;
+	source->total = 0;
+	source->bad = false;
+	memset(source->name, 0, sizeof(source->name));
+	ISC_LINK_INIT(source, link);
+	if (is_usocket) {
+		source->sources.usocket.handle = fd;
+		if (is_connected)
+			source->sources.usocket.status =
+					isc_usocketsource_connected;
+		else
+			source->sources.usocket.status =
+					isc_usocketsource_connecting;
+		source->sources.usocket.sz_to_recv = 0;
+		source->type = ENTROPY_SOURCETYPE_USOCKET;
+	} else {
+		source->sources.file.handle = fd;
+		source->type = ENTROPY_SOURCETYPE_FILE;
+	}
+
+	/*
+	 * Hook it into the entropy system.
+	 */
+	ISC_LIST_APPEND(ent->sources, source, link);
+	ent->nsources++;
+
+	UNLOCK(&ent->lock);
+	return (ISC_R_SUCCESS);
+
+ closefd:
+	(void)close(fd);
+
+ errout:
+	UNLOCK(&ent->lock);
+
+	return (ret);
+}
diff --git a/lib/isc/unix/errno.c b/lib/isc/unix/errno.c
new file mode 100644
index 0000000..a2445f3
--- /dev/null
+++ b/lib/isc/unix/errno.c
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*! \file */
+
+#include <config.h>
+
+#include <isc/errno.h>
+#include <isc/util.h>
+
+#include "errno2result.h"
+
+isc_result_t
+isc_errno_toresult(int err) {
+	return (isc___errno2result(err, false, 0, 0));
+}
diff --git a/lib/isc/unix/errno2result.c b/lib/isc/unix/errno2result.c
new file mode 100644
index 0000000..2f12bcc
--- /dev/null
+++ b/lib/isc/unix/errno2result.c
@@ -0,0 +1,125 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+
+/*! \file */
+
+#include <config.h>
+
+#include <stdbool.h>
+
+#include <isc/result.h>
+#include <isc/strerror.h>
+#include <isc/util.h>
+
+#include "errno2result.h"
+
+/*%
+ * Convert a POSIX errno value into an isc_result_t.  The
+ * list of supported errno values is not complete; new users
+ * of this function should add any expected errors that are
+ * not already there.
+ */
+isc_result_t
+isc___errno2result(int posixerrno, bool dolog,
+		   const char *file, unsigned int line)
+{
+	char strbuf[ISC_STRERRORSIZE];
+
+	switch (posixerrno) {
+	case ENOTDIR:
+	case ELOOP:
+	case EINVAL:		/* XXX sometimes this is not for files */
+	case ENAMETOOLONG:
+	case EBADF:
+		return (ISC_R_INVALIDFILE);
+	case ENOENT:
+		return (ISC_R_FILENOTFOUND);
+	case EACCES:
+	case EPERM:
+		return (ISC_R_NOPERM);
+	case EEXIST:
+		return (ISC_R_FILEEXISTS);
+	case EIO:
+		return (ISC_R_IOERROR);
+	case ENOMEM:
+		return (ISC_R_NOMEMORY);
+	case ENFILE:
+	case EMFILE:
+		return (ISC_R_TOOMANYOPENFILES);
+#ifdef EOVERFLOW
+	case EOVERFLOW:
+		return (ISC_R_RANGE);
+#endif
+	case EPIPE:
+#ifdef ECONNRESET
+	case ECONNRESET:
+#endif
+#ifdef ECONNABORTED
+	case ECONNABORTED:
+#endif
+		return (ISC_R_CONNECTIONRESET);
+#ifdef ENOTCONN
+	case ENOTCONN:
+		return (ISC_R_NOTCONNECTED);
+#endif
+#ifdef ETIMEDOUT
+	case ETIMEDOUT:
+		return (ISC_R_TIMEDOUT);
+#endif
+#ifdef ENOBUFS
+	case ENOBUFS:
+		return (ISC_R_NORESOURCES);
+#endif
+#ifdef EAFNOSUPPORT
+	case EAFNOSUPPORT:
+		return (ISC_R_FAMILYNOSUPPORT);
+#endif
+#ifdef ENETDOWN
+	case ENETDOWN:
+		return (ISC_R_NETDOWN);
+#endif
+#ifdef EHOSTDOWN
+	case EHOSTDOWN:
+		return (ISC_R_HOSTDOWN);
+#endif
+#ifdef ENETUNREACH
+	case ENETUNREACH:
+		return (ISC_R_NETUNREACH);
+#endif
+#ifdef EHOSTUNREACH
+	case EHOSTUNREACH:
+		return (ISC_R_HOSTUNREACH);
+#endif
+#ifdef EADDRINUSE
+	case EADDRINUSE:
+		return (ISC_R_ADDRINUSE);
+#endif
+	case EADDRNOTAVAIL:
+		return (ISC_R_ADDRNOTAVAIL);
+	case ECONNREFUSED:
+		return (ISC_R_CONNREFUSED);
+	default:
+		if (dolog) {
+			isc__strerror(posixerrno, strbuf, sizeof(strbuf));
+			UNEXPECTED_ERROR(file, line, "unable to convert errno "
+					 "to isc_result: %d: %s",
+					 posixerrno, strbuf);
+		}
+		/*
+		 * XXXDCL would be nice if perhaps this function could
+		 * return the system's error string, so the caller
+		 * might have something more descriptive than "unexpected
+		 * error" to log with.
+		 */
+		return (ISC_R_UNEXPECTED);
+	}
+}
diff --git a/lib/isc/unix/errno2result.h b/lib/isc/unix/errno2result.h
new file mode 100644
index 0000000..7733ab3
--- /dev/null
+++ b/lib/isc/unix/errno2result.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+#ifndef UNIX_ERRNO2RESULT_H
+#define UNIX_ERRNO2RESULT_H 1
+
+/*! \file */
+
+/* XXXDCL this should be moved to lib/isc/include/isc/errno2result.h. */
+
+#include <errno.h>		/* Provides errno. */
+#include <stdbool.h>
+
+#include <isc/lang.h>
+#include <isc/types.h>
+
+ISC_LANG_BEGINDECLS
+
+#define isc__errno2result(x) isc___errno2result(x, true, __FILE__, __LINE__)
+
+isc_result_t
+isc___errno2result(int posixerrno, bool dolog,
+		   const char *file, unsigned int line);
+
+ISC_LANG_ENDDECLS
+
+#endif /* UNIX_ERRNO2RESULT_H */
diff --git a/lib/isc/unix/file.c b/lib/isc/unix/file.c
new file mode 100644
index 0000000..64d9596
--- /dev/null
+++ b/lib/isc/unix/file.c
@@ -0,0 +1,781 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*
+ * Portions Copyright (c) 1987, 1993
+ *      The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+
+/*! \file */
+
+#include <config.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <inttypes.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <time.h>		/* Required for utimes on some platforms. */
+#include <unistd.h>		/* Required for mkstemp on NetBSD. */
+
+
+#include <sys/stat.h>
+#include <sys/time.h>
+
+#ifdef HAVE_SYS_MMAN_H
+#include <sys/mman.h>
+#endif
+
+#include <isc/dir.h>
+#include <isc/file.h>
+#include <isc/log.h>
+#include <isc/mem.h>
+#include <isc/print.h>
+#include <isc/random.h>
+#include <isc/sha2.h>
+#include <isc/string.h>
+#include <isc/time.h>
+#include <isc/util.h>
+
+#include "errno2result.h"
+
+/*
+ * XXXDCL As the API for accessing file statistics undoubtedly gets expanded,
+ * it might be good to provide a mechanism that allows for the results
+ * of a previous stat() to be used again without having to do another stat,
+ * such as perl's mechanism of using "_" in place of a file name to indicate
+ * that the results of the last stat should be used.  But then you get into
+ * annoying MP issues.   BTW, Win32 has stat().
+ */
+static isc_result_t
+file_stats(const char *file, struct stat *stats) {
+	isc_result_t result = ISC_R_SUCCESS;
+
+	REQUIRE(file != NULL);
+	REQUIRE(stats != NULL);
+
+	if (stat(file, stats) != 0)
+		result = isc__errno2result(errno);
+
+	return (result);
+}
+
+static isc_result_t
+fd_stats(int fd, struct stat *stats) {
+	isc_result_t result = ISC_R_SUCCESS;
+
+	REQUIRE(stats != NULL);
+
+	if (fstat(fd, stats) != 0)
+		result = isc__errno2result(errno);
+
+	return (result);
+}
+
+isc_result_t
+isc_file_getsizefd(int fd, off_t *size) {
+	isc_result_t result;
+	struct stat stats;
+
+	REQUIRE(size != NULL);
+
+	result = fd_stats(fd, &stats);
+
+	if (result == ISC_R_SUCCESS)
+		*size = stats.st_size;
+
+	return (result);
+}
+
+isc_result_t
+isc_file_mode(const char *file, mode_t *modep) {
+	isc_result_t result;
+	struct stat stats;
+
+	REQUIRE(modep != NULL);
+
+	result = file_stats(file, &stats);
+	if (result == ISC_R_SUCCESS)
+		*modep = (stats.st_mode & 07777);
+
+	return (result);
+}
+
+isc_result_t
+isc_file_getmodtime(const char *file, isc_time_t *modtime) {
+	isc_result_t result;
+	struct stat stats;
+
+	REQUIRE(file != NULL);
+	REQUIRE(modtime != NULL);
+
+	result = file_stats(file, &stats);
+
+	if (result == ISC_R_SUCCESS)
+#ifdef ISC_PLATFORM_HAVESTATNSEC
+		isc_time_set(modtime, stats.st_mtime, stats.st_mtim.tv_nsec);
+#else
+		isc_time_set(modtime, stats.st_mtime, 0);
+#endif
+
+	return (result);
+}
+
+isc_result_t
+isc_file_getsize(const char *file, off_t *size) {
+	isc_result_t result;
+	struct stat stats;
+
+	REQUIRE(file != NULL);
+	REQUIRE(size != NULL);
+
+	result = file_stats(file, &stats);
+
+	if (result == ISC_R_SUCCESS)
+		*size = stats.st_size;
+
+	return (result);
+}
+
+isc_result_t
+isc_file_settime(const char *file, isc_time_t *when) {
+	struct timeval times[2];
+
+	REQUIRE(file != NULL && when != NULL);
+
+	/*
+	 * tv_sec is at least a 32 bit quantity on all platforms we're
+	 * dealing with, but it is signed on most (all?) of them,
+	 * so we need to make sure the high bit isn't set.  This unfortunately
+	 * loses when either:
+	 *   * tv_sec becomes a signed 64 bit integer but long is 32 bits
+	 *	and isc_time_seconds > LONG_MAX, or
+	 *   * isc_time_seconds is changed to be > 32 bits but long is 32 bits
+	 *      and isc_time_seconds has at least 33 significant bits.
+	 */
+	times[0].tv_sec = times[1].tv_sec = (long)isc_time_seconds(when);
+
+	/*
+	 * Here is the real check for the high bit being set.
+	 */
+	if ((times[0].tv_sec &
+	     (1ULL << (sizeof(times[0].tv_sec) * CHAR_BIT - 1))) != 0)
+		return (ISC_R_RANGE);
+
+	/*
+	 * isc_time_nanoseconds guarantees a value that divided by 1000 will
+	 * fit into the minimum possible size tv_usec field.  Unfortunately,
+	 * we don't know what that type is so can't cast directly ... but
+	 * we can at least cast to signed so the IRIX compiler shuts up.
+	 */
+	times[0].tv_usec = times[1].tv_usec =
+		(int32_t)(isc_time_nanoseconds(when) / 1000);
+
+	if (utimes(file, times) < 0)
+		return (isc__errno2result(errno));
+
+	return (ISC_R_SUCCESS);
+}
+
+#undef TEMPLATE
+#define TEMPLATE "tmp-XXXXXXXXXX" /*%< 14 characters. */
+
+isc_result_t
+isc_file_mktemplate(const char *path, char *buf, size_t buflen) {
+	return (isc_file_template(path, TEMPLATE, buf, buflen));
+}
+
+isc_result_t
+isc_file_template(const char *path, const char *templet, char *buf,
+		  size_t buflen)
+{
+	const char *s;
+
+	REQUIRE(templet != NULL);
+	REQUIRE(buf != NULL);
+
+	if (path == NULL)
+		path = "";
+
+	s = strrchr(templet, '/');
+	if (s != NULL)
+		templet = s + 1;
+
+	s = strrchr(path, '/');
+
+	if (s != NULL) {
+		size_t prefixlen = s - path + 1;
+		if ((prefixlen + strlen(templet) + 1) > buflen)
+			return (ISC_R_NOSPACE);
+
+		/* Copy 'prefixlen' bytes and NUL terminate. */
+		strlcpy(buf, path, ISC_MIN(prefixlen + 1, buflen));
+		strlcat(buf, templet, buflen);
+	} else {
+		if ((strlen(templet) + 1) > buflen)
+			return (ISC_R_NOSPACE);
+
+		strlcpy(buf, templet, buflen);
+	}
+
+	return (ISC_R_SUCCESS);
+}
+
+static const char alphnum[] =
+	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
+
+isc_result_t
+isc_file_renameunique(const char *file, char *templet) {
+	char *x;
+	char *cp;
+
+	REQUIRE(file != NULL);
+	REQUIRE(templet != NULL);
+
+	cp = templet;
+	while (*cp != '\0')
+		cp++;
+	if (cp == templet)
+		return (ISC_R_FAILURE);
+
+	x = cp--;
+	while (cp >= templet && *cp == 'X') {
+		uint32_t which;
+
+		isc_random_get(&which);
+		*cp = alphnum[which % (sizeof(alphnum) - 1)];
+		x = cp--;
+	}
+	while (link(file, templet) == -1) {
+		if (errno != EEXIST)
+			return (isc__errno2result(errno));
+		for (cp = x;;) {
+			const char *t;
+			if (*cp == '\0')
+				return (ISC_R_FAILURE);
+			t = strchr(alphnum, *cp);
+			if (t == NULL || *++t == '\0')
+				*cp++ = alphnum[0];
+			else {
+				*cp = *t;
+				break;
+			}
+		}
+	}
+	if (unlink(file) < 0)
+		if (errno != ENOENT)
+			return (isc__errno2result(errno));
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc_file_openunique(char *templet, FILE **fp) {
+	int mode = S_IWUSR|S_IRUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;
+	return (isc_file_openuniquemode(templet, mode, fp));
+}
+
+isc_result_t
+isc_file_openuniqueprivate(char *templet, FILE **fp) {
+	int mode = S_IWUSR|S_IRUSR;
+	return (isc_file_openuniquemode(templet, mode, fp));
+}
+
+isc_result_t
+isc_file_openuniquemode(char *templet, int mode, FILE **fp) {
+	int fd;
+	FILE *f;
+	isc_result_t result = ISC_R_SUCCESS;
+	char *x;
+	char *cp;
+
+	REQUIRE(templet != NULL);
+	REQUIRE(fp != NULL && *fp == NULL);
+
+	cp = templet;
+	while (*cp != '\0')
+		cp++;
+	if (cp == templet)
+		return (ISC_R_FAILURE);
+
+	x = cp--;
+	while (cp >= templet && *cp == 'X') {
+		uint32_t which;
+
+		isc_random_get(&which);
+		*cp = alphnum[which % (sizeof(alphnum) - 1)];
+		x = cp--;
+	}
+
+
+	while ((fd = open(templet, O_RDWR|O_CREAT|O_EXCL, mode)) == -1) {
+		if (errno != EEXIST)
+			return (isc__errno2result(errno));
+		for (cp = x;;) {
+			char *t;
+			if (*cp == '\0')
+				return (ISC_R_FAILURE);
+			t = strchr(alphnum, *cp);
+			if (t == NULL || *++t == '\0')
+				*cp++ = alphnum[0];
+			else {
+				*cp = *t;
+				break;
+			}
+		}
+	}
+	f = fdopen(fd, "w+");
+	if (f == NULL) {
+		result = isc__errno2result(errno);
+		if (remove(templet) < 0) {
+			isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+				      ISC_LOGMODULE_FILE, ISC_LOG_ERROR,
+				      "remove '%s': failed", templet);
+		}
+		(void)close(fd);
+	} else
+		*fp = f;
+
+	return (result);
+}
+
+isc_result_t
+isc_file_bopenunique(char *templet, FILE **fp) {
+	int mode = S_IWUSR|S_IRUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;
+	return (isc_file_openuniquemode(templet, mode, fp));
+}
+
+isc_result_t
+isc_file_bopenuniqueprivate(char *templet, FILE **fp) {
+	int mode = S_IWUSR|S_IRUSR;
+	return (isc_file_openuniquemode(templet, mode, fp));
+}
+
+isc_result_t
+isc_file_bopenuniquemode(char *templet, int mode, FILE **fp) {
+	return (isc_file_openuniquemode(templet, mode, fp));
+}
+
+isc_result_t
+isc_file_remove(const char *filename) {
+	int r;
+
+	REQUIRE(filename != NULL);
+
+	r = unlink(filename);
+	if (r == 0)
+		return (ISC_R_SUCCESS);
+	else
+		return (isc__errno2result(errno));
+}
+
+isc_result_t
+isc_file_rename(const char *oldname, const char *newname) {
+	int r;
+
+	REQUIRE(oldname != NULL);
+	REQUIRE(newname != NULL);
+
+	r = rename(oldname, newname);
+	if (r == 0)
+		return (ISC_R_SUCCESS);
+	else
+		return (isc__errno2result(errno));
+}
+
+bool
+isc_file_exists(const char *pathname) {
+	struct stat stats;
+
+	REQUIRE(pathname != NULL);
+
+	return (file_stats(pathname, &stats) == ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc_file_isplainfile(const char *filename) {
+	/*
+	 * This function returns success if filename is a plain file.
+	 */
+	struct stat filestat;
+	memset(&filestat,0,sizeof(struct stat));
+
+	if ((stat(filename, &filestat)) == -1)
+		return(isc__errno2result(errno));
+
+	if(! S_ISREG(filestat.st_mode))
+		return(ISC_R_INVALIDFILE);
+
+	return(ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc_file_isplainfilefd(int fd) {
+	/*
+	 * This function returns success if filename is a plain file.
+	 */
+	struct stat filestat;
+	memset(&filestat,0,sizeof(struct stat));
+
+	if ((fstat(fd, &filestat)) == -1)
+		return(isc__errno2result(errno));
+
+	if(! S_ISREG(filestat.st_mode))
+		return(ISC_R_INVALIDFILE);
+
+	return(ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc_file_isdirectory(const char *filename) {
+	/*
+	 * This function returns success if filename exists and is a
+	 * directory.
+	 */
+	struct stat filestat;
+	memset(&filestat,0,sizeof(struct stat));
+
+	if ((stat(filename, &filestat)) == -1)
+		return(isc__errno2result(errno));
+
+	if(! S_ISDIR(filestat.st_mode))
+		return(ISC_R_INVALIDFILE);
+
+	return(ISC_R_SUCCESS);
+}
+
+
+bool
+isc_file_isabsolute(const char *filename) {
+	REQUIRE(filename != NULL);
+	return (filename[0] == '/');
+}
+
+bool
+isc_file_iscurrentdir(const char *filename) {
+	REQUIRE(filename != NULL);
+	return (filename[0] == '.' && filename[1] == '\0');
+}
+
+bool
+isc_file_ischdiridempotent(const char *filename) {
+	REQUIRE(filename != NULL);
+	if (isc_file_isabsolute(filename))
+		return (true);
+	if (isc_file_iscurrentdir(filename))
+		return (true);
+	return (false);
+}
+
+const char *
+isc_file_basename(const char *filename) {
+	const char *s;
+
+	REQUIRE(filename != NULL);
+
+	s = strrchr(filename, '/');
+	if (s == NULL)
+		return (filename);
+
+	return (s + 1);
+}
+
+isc_result_t
+isc_file_progname(const char *filename, char *buf, size_t buflen) {
+	const char *base;
+	size_t len;
+
+	REQUIRE(filename != NULL);
+	REQUIRE(buf != NULL);
+
+	base = isc_file_basename(filename);
+	len = strlen(base) + 1;
+
+	if (len > buflen)
+		return (ISC_R_NOSPACE);
+	memmove(buf, base, len);
+
+	return (ISC_R_SUCCESS);
+}
+
+/*
+ * Put the absolute name of the current directory into 'dirname', which is
+ * a buffer of at least 'length' characters.  End the string with the
+ * appropriate path separator, such that the final product could be
+ * concatenated with a relative pathname to make a valid pathname string.
+ */
+static isc_result_t
+dir_current(char *dirname, size_t length) {
+	char *cwd;
+	isc_result_t result = ISC_R_SUCCESS;
+
+	REQUIRE(dirname != NULL);
+	REQUIRE(length > 0U);
+
+	cwd = getcwd(dirname, length);
+
+	if (cwd == NULL) {
+		if (errno == ERANGE) {
+			result = ISC_R_NOSPACE;
+		} else {
+			result = isc__errno2result(errno);
+		}
+	} else {
+		if (strlen(dirname) + 1 == length) {
+			result = ISC_R_NOSPACE;
+		} else if (dirname[1] != '\0') {
+			strlcat(dirname, "/", length);
+		}
+	}
+
+	return (result);
+}
+
+isc_result_t
+isc_file_absolutepath(const char *filename, char *path, size_t pathlen) {
+	isc_result_t result;
+	result = dir_current(path, pathlen);
+	if (result != ISC_R_SUCCESS)
+		return (result);
+	if (strlen(path) + strlen(filename) + 1 > pathlen)
+		return (ISC_R_NOSPACE);
+	strlcat(path, filename, pathlen);
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc_file_truncate(const char *filename, isc_offset_t size) {
+	isc_result_t result = ISC_R_SUCCESS;
+
+	if (truncate(filename, size) < 0)
+		result = isc__errno2result(errno);
+	return (result);
+}
+
+isc_result_t
+isc_file_safecreate(const char *filename, FILE **fp) {
+	isc_result_t result;
+	int flags;
+	struct stat sb;
+	FILE *f;
+	int fd;
+
+	REQUIRE(filename != NULL);
+	REQUIRE(fp != NULL && *fp == NULL);
+
+	result = file_stats(filename, &sb);
+	if (result == ISC_R_SUCCESS) {
+		if ((sb.st_mode & S_IFREG) == 0)
+			return (ISC_R_INVALIDFILE);
+		flags = O_WRONLY | O_TRUNC;
+	} else if (result == ISC_R_FILENOTFOUND) {
+		flags = O_WRONLY | O_CREAT | O_EXCL;
+	} else
+		return (result);
+
+	fd = open(filename, flags, S_IRUSR | S_IWUSR);
+	if (fd == -1)
+		return (isc__errno2result(errno));
+
+	f = fdopen(fd, "w");
+	if (f == NULL) {
+		result = isc__errno2result(errno);
+		close(fd);
+		return (result);
+	}
+
+	*fp = f;
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc_file_splitpath(isc_mem_t *mctx, const char *path, char **dirname,
+		   char const **bname)
+{
+	char *dir;
+	const char *file, *slash;
+
+	if (path == NULL)
+		return (ISC_R_INVALIDFILE);
+
+	slash = strrchr(path, '/');
+
+	if (slash == path) {
+		file = ++slash;
+		dir = isc_mem_strdup(mctx, "/");
+	} else if (slash != NULL) {
+		file = ++slash;
+		dir = isc_mem_allocate(mctx, slash - path);
+		if (dir != NULL)
+			strlcpy(dir, path, slash - path);
+	} else {
+		file = path;
+		dir = isc_mem_strdup(mctx, ".");
+	}
+
+	if (dir == NULL)
+		return (ISC_R_NOMEMORY);
+
+	if (*file == '\0') {
+		isc_mem_free(mctx, dir);
+		return (ISC_R_INVALIDFILE);
+	}
+
+	*dirname = dir;
+	*bname = file;
+
+	return (ISC_R_SUCCESS);
+}
+
+void *
+isc_file_mmap(void *addr, size_t len, int prot,
+	      int flags, int fd, off_t offset)
+{
+#ifdef HAVE_MMAP
+	return (mmap(addr, len, prot, flags, fd, offset));
+#else
+	void *buf;
+	ssize_t ret;
+	off_t end;
+
+	UNUSED(addr);
+	UNUSED(prot);
+	UNUSED(flags);
+
+	end = lseek(fd, 0, SEEK_END);
+	lseek(fd, offset, SEEK_SET);
+	if (end - offset < (off_t) len)
+		len = end - offset;
+
+	buf = malloc(len);
+	if (buf == NULL)
+		return (NULL);
+
+	ret = read(fd, buf, len);
+	if (ret != (ssize_t) len) {
+		free(buf);
+		buf = NULL;
+	}
+
+	return (buf);
+#endif
+}
+
+int
+isc_file_munmap(void *addr, size_t len) {
+#ifdef HAVE_MMAP
+	return (munmap(addr, len));
+#else
+	UNUSED(len);
+
+	free(addr);
+	return (0);
+#endif
+}
+
+#define DISALLOW "\\/ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+#ifndef PATH_MAX
+#define PATH_MAX 1024
+#endif
+
+isc_result_t
+isc_file_sanitize(const char *dir, const char *base, const char *ext,
+		  char *path, size_t length)
+{
+	char buf[PATH_MAX], hash[ISC_SHA256_DIGESTSTRINGLENGTH];
+	size_t l = 0;
+
+	REQUIRE(base != NULL);
+	REQUIRE(path != NULL);
+
+	l = strlen(base) + 1;
+
+	/*
+	 * allow room for a full sha256 hash (64 chars
+	 * plus null terminator)
+	 */
+	if (l < 65U)
+		l = 65;
+
+	if (dir != NULL)
+		l += strlen(dir) + 1;
+	if (ext != NULL)
+		l += strlen(ext) + 1;
+
+	if (l > length || l > (unsigned)PATH_MAX)
+		return (ISC_R_NOSPACE);
+
+	/* Check whether the full-length SHA256 hash filename exists */
+	isc_sha256_data((const void *) base, strlen(base), hash);
+	snprintf(buf, sizeof(buf), "%s%s%s%s%s",
+		dir != NULL ? dir : "", dir != NULL ? "/" : "",
+		hash, ext != NULL ? "." : "", ext != NULL ? ext : "");
+	if (isc_file_exists(buf)) {
+		strlcpy(path, buf, length);
+		return (ISC_R_SUCCESS);
+	}
+
+	/* Check for a truncated SHA256 hash filename */
+	hash[16] = '\0';
+	snprintf(buf, sizeof(buf), "%s%s%s%s%s",
+		dir != NULL ? dir : "", dir != NULL ? "/" : "",
+		hash, ext != NULL ? "." : "", ext != NULL ? ext : "");
+	if (isc_file_exists(buf)) {
+		strlcpy(path, buf, length);
+		return (ISC_R_SUCCESS);
+	}
+
+	/*
+	 * If neither hash filename already exists, then we'll use
+	 * the original base name if it has no disallowed characters,
+	 * or the truncated hash name if it does.
+	 */
+	if (strpbrk(base, DISALLOW) != NULL) {
+		strlcpy(path, buf, length);
+		return (ISC_R_SUCCESS);
+	}
+
+	snprintf(buf, sizeof(buf), "%s%s%s%s%s",
+		dir != NULL ? dir : "", dir != NULL ? "/" : "",
+		base, ext != NULL ? "." : "", ext != NULL ? ext : "");
+	strlcpy(path, buf, length);
+	return (ISC_R_SUCCESS);
+}
+
+bool
+isc_file_isdirwritable(const char *path) {
+	return (access(path, W_OK|X_OK) == 0);
+}
diff --git a/lib/isc/unix/fsaccess.c b/lib/isc/unix/fsaccess.c
new file mode 100644
index 0000000..e3cd0bf
--- /dev/null
+++ b/lib/isc/unix/fsaccess.c
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+
+#include <config.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <stdbool.h>
+#include <errno.h>
+
+#include "errno2result.h"
+
+/*! \file
+ * \brief
+ * The OS-independent part of the API is in lib/isc.
+ */
+#include "../fsaccess.c"
+
+isc_result_t
+isc_fsaccess_set(const char *path, isc_fsaccess_t access) {
+	struct stat statb;
+	mode_t mode;
+	bool is_dir = false;
+	isc_fsaccess_t bits;
+	isc_result_t result;
+
+	if (stat(path, &statb) != 0)
+		return (isc__errno2result(errno));
+
+	if ((statb.st_mode & S_IFDIR) != 0)
+		is_dir = true;
+	else if ((statb.st_mode & S_IFREG) == 0)
+		return (ISC_R_INVALIDFILE);
+
+	result = check_bad_bits(access, is_dir);
+	if (result != ISC_R_SUCCESS)
+		return (result);
+
+	/*
+	 * Done with checking bad bits.  Set mode_t.
+	 */
+	mode = 0;
+
+#define SET_AND_CLEAR1(modebit) \
+	if ((access & bits) != 0) { \
+		mode |= modebit; \
+		access &= ~bits; \
+	}
+#define SET_AND_CLEAR(user, group, other) \
+	SET_AND_CLEAR1(user); \
+	bits <<= STEP; \
+	SET_AND_CLEAR1(group); \
+	bits <<= STEP; \
+	SET_AND_CLEAR1(other);
+
+	bits = ISC_FSACCESS_READ | ISC_FSACCESS_LISTDIRECTORY;
+
+	SET_AND_CLEAR(S_IRUSR, S_IRGRP, S_IROTH);
+
+	bits = ISC_FSACCESS_WRITE |
+	       ISC_FSACCESS_CREATECHILD |
+	       ISC_FSACCESS_DELETECHILD;
+
+	SET_AND_CLEAR(S_IWUSR, S_IWGRP, S_IWOTH);
+
+	bits = ISC_FSACCESS_EXECUTE |
+	       ISC_FSACCESS_ACCESSCHILD;
+
+	SET_AND_CLEAR(S_IXUSR, S_IXGRP, S_IXOTH);
+
+	INSIST(access == 0);
+
+	if (chmod(path, mode) < 0)
+		return (isc__errno2result(errno));
+
+	return (ISC_R_SUCCESS);
+}
diff --git a/lib/isc/unix/ifiter_getifaddrs.c b/lib/isc/unix/ifiter_getifaddrs.c
new file mode 100644
index 0000000..de6f060
--- /dev/null
+++ b/lib/isc/unix/ifiter_getifaddrs.c
@@ -0,0 +1,228 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+
+/*! \file
+ * \brief
+ * Obtain the list of network interfaces using the getifaddrs(3) library.
+ */
+
+#include <stdbool.h>
+#include <ifaddrs.h>
+
+/*% Iterator Magic */
+#define IFITER_MAGIC		ISC_MAGIC('I', 'F', 'I', 'G')
+/*% Valid Iterator */
+#define VALID_IFITER(t)		ISC_MAGIC_VALID(t, IFITER_MAGIC)
+
+#ifdef __linux
+static bool seenv6 = false;
+#endif
+
+/*% Iterator structure */
+struct isc_interfaceiter {
+	unsigned int		magic;		/*%< Magic number. */
+	isc_mem_t		*mctx;
+	void			*buf;		/*%< (unused) */
+	unsigned int		bufsize;	/*%< (always 0) */
+	struct ifaddrs		*ifaddrs;	/*%< List of ifaddrs */
+	struct ifaddrs		*pos;		/*%< Ptr to current ifaddr */
+	isc_interface_t		current;	/*%< Current interface data. */
+	isc_result_t		result;		/*%< Last result code. */
+#ifdef  __linux
+	FILE *                  proc;
+	char                    entry[ISC_IF_INET6_SZ];
+	isc_result_t            valid;
+#endif
+};
+
+isc_result_t
+isc_interfaceiter_create(isc_mem_t *mctx, isc_interfaceiter_t **iterp) {
+	isc_interfaceiter_t *iter;
+	isc_result_t result;
+	char strbuf[ISC_STRERRORSIZE];
+
+	REQUIRE(mctx != NULL);
+	REQUIRE(iterp != NULL);
+	REQUIRE(*iterp == NULL);
+
+	iter = isc_mem_get(mctx, sizeof(*iter));
+	if (iter == NULL)
+		return (ISC_R_NOMEMORY);
+
+	iter->mctx = mctx;
+	iter->buf = NULL;
+	iter->bufsize = 0;
+	iter->ifaddrs = NULL;
+#ifdef __linux
+	/*
+	 * Only open "/proc/net/if_inet6" if we have never seen a IPv6
+	 * address returned by getifaddrs().
+	 */
+	if (!seenv6)
+		iter->proc = fopen("/proc/net/if_inet6", "r");
+	else
+		iter->proc = NULL;
+	iter->valid = ISC_R_FAILURE;
+#endif
+
+	if (getifaddrs(&iter->ifaddrs) < 0) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 isc_msgcat_get(isc_msgcat,
+						ISC_MSGSET_IFITERGETIFADDRS,
+						ISC_MSG_GETIFADDRS,
+						"getting interface "
+						"addresses: getifaddrs: %s"),
+				 strbuf);
+		result = ISC_R_UNEXPECTED;
+		goto failure;
+	}
+
+	/*
+	 * A newly created iterator has an undefined position
+	 * until isc_interfaceiter_first() is called.
+	 */
+	iter->pos = NULL;
+	iter->result = ISC_R_FAILURE;
+
+	iter->magic = IFITER_MAGIC;
+	*iterp = iter;
+	return (ISC_R_SUCCESS);
+
+ failure:
+#ifdef __linux
+	if (iter->proc != NULL)
+		fclose(iter->proc);
+#endif
+	if (iter->ifaddrs != NULL) /* just in case */
+		freeifaddrs(iter->ifaddrs);
+	isc_mem_put(mctx, iter, sizeof(*iter));
+	return (result);
+}
+
+/*
+ * Get information about the current interface to iter->current.
+ * If successful, return ISC_R_SUCCESS.
+ * If the interface has an unsupported address family,
+ * return ISC_R_IGNORE.
+ */
+
+static isc_result_t
+internal_current(isc_interfaceiter_t *iter) {
+	struct ifaddrs *ifa;
+	int family;
+	unsigned int namelen;
+
+	REQUIRE(VALID_IFITER(iter));
+
+	ifa = iter->pos;
+
+#ifdef __linux
+	if (iter->pos == NULL)
+		return (linux_if_inet6_current(iter));
+#endif
+
+	INSIST(ifa != NULL);
+	INSIST(ifa->ifa_name != NULL);
+
+	if (ifa->ifa_addr == NULL)
+		return (ISC_R_IGNORE);
+
+	family = ifa->ifa_addr->sa_family;
+	if (family != AF_INET && family != AF_INET6)
+		return (ISC_R_IGNORE);
+
+#ifdef __linux
+	if (family == AF_INET6)
+		seenv6 = true;
+#endif
+
+	memset(&iter->current, 0, sizeof(iter->current));
+
+	namelen = strlen(ifa->ifa_name);
+	if (namelen > sizeof(iter->current.name) - 1)
+		namelen = sizeof(iter->current.name) - 1;
+
+	memset(iter->current.name, 0, sizeof(iter->current.name));
+	memmove(iter->current.name, ifa->ifa_name, namelen);
+
+	iter->current.flags = 0;
+
+	if ((ifa->ifa_flags & IFF_UP) != 0)
+		iter->current.flags |= INTERFACE_F_UP;
+
+	if ((ifa->ifa_flags & IFF_POINTOPOINT) != 0)
+		iter->current.flags |= INTERFACE_F_POINTTOPOINT;
+
+	if ((ifa->ifa_flags & IFF_LOOPBACK) != 0)
+		iter->current.flags |= INTERFACE_F_LOOPBACK;
+
+	iter->current.af = family;
+
+	get_addr(family, &iter->current.address, ifa->ifa_addr, ifa->ifa_name);
+
+	if (ifa->ifa_netmask != NULL)
+		get_addr(family, &iter->current.netmask, ifa->ifa_netmask,
+			 ifa->ifa_name);
+
+	if (ifa->ifa_dstaddr != NULL &&
+	    (iter->current.flags & INTERFACE_F_POINTTOPOINT) != 0)
+		get_addr(family, &iter->current.dstaddress, ifa->ifa_dstaddr,
+			 ifa->ifa_name);
+
+	return (ISC_R_SUCCESS);
+}
+
+/*
+ * Step the iterator to the next interface.  Unlike
+ * isc_interfaceiter_next(), this may leave the iterator
+ * positioned on an interface that will ultimately
+ * be ignored.  Return ISC_R_NOMORE if there are no more
+ * interfaces, otherwise ISC_R_SUCCESS.
+ */
+static isc_result_t
+internal_next(isc_interfaceiter_t *iter) {
+
+	if (iter->pos != NULL)
+		iter->pos = iter->pos->ifa_next;
+	if (iter->pos == NULL) {
+#ifdef __linux
+		if (!seenv6)
+			return (linux_if_inet6_next(iter));
+#endif
+		return (ISC_R_NOMORE);
+	}
+
+	return (ISC_R_SUCCESS);
+}
+
+static void
+internal_destroy(isc_interfaceiter_t *iter) {
+
+#ifdef __linux
+	if (iter->proc != NULL)
+		fclose(iter->proc);
+	iter->proc = NULL;
+#endif
+	if (iter->ifaddrs)
+		freeifaddrs(iter->ifaddrs);
+	iter->ifaddrs = NULL;
+}
+
+static
+void internal_first(isc_interfaceiter_t *iter) {
+
+#ifdef __linux
+	linux_if_inet6_first(iter);
+#endif
+	iter->pos = iter->ifaddrs;
+}
diff --git a/lib/isc/unix/ifiter_ioctl.c b/lib/isc/unix/ifiter_ioctl.c
new file mode 100644
index 0000000..9702fae
--- /dev/null
+++ b/lib/isc/unix/ifiter_ioctl.c
@@ -0,0 +1,931 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+#include <config.h>
+
+#include <stdbool.h>
+
+#include <isc/print.h>
+
+/*! \file
+ * \brief
+ * Obtain the list of network interfaces using the SIOCGLIFCONF ioctl.
+ * See netintro(4).
+ */
+
+#if defined(SIOCGLIFCONF) && defined(SIOCGLIFADDR)
+#ifdef ISC_PLATFORM_HAVEIF_LADDRCONF
+#define lifc_len iflc_len
+#define lifc_buf iflc_buf
+#define lifc_req iflc_req
+#define LIFCONF if_laddrconf
+#else
+#define ISC_HAVE_LIFC_FAMILY 1
+#define ISC_HAVE_LIFC_FLAGS 1
+#define LIFCONF lifconf
+#endif
+
+#ifdef ISC_PLATFORM_HAVEIF_LADDRREQ
+#define lifr_addr iflr_addr
+#define lifr_name iflr_name
+#define lifr_dstaddr iflr_dstaddr
+#define lifr_flags iflr_flags
+#define ss_family sa_family
+#define LIFREQ if_laddrreq
+#else
+#define LIFREQ lifreq
+#endif
+#endif
+
+#define IFITER_MAGIC		ISC_MAGIC('I', 'F', 'I', 'T')
+#define VALID_IFITER(t)		ISC_MAGIC_VALID(t, IFITER_MAGIC)
+
+struct isc_interfaceiter {
+	unsigned int		magic;		/* Magic number. */
+	isc_mem_t		*mctx;
+	int			mode;
+	int			socket;
+	struct ifconf 		ifc;
+	void			*buf;		/* Buffer for sysctl data. */
+	unsigned int		bufsize;	/* Bytes allocated. */
+	unsigned int		pos;		/* Current offset in
+						   SIOCGIFCONF data */
+#if defined(SIOCGLIFCONF) && defined(SIOCGLIFADDR)
+	int			socket6;
+	struct LIFCONF 		lifc;
+	void			*buf6;		/* Buffer for sysctl data. */
+	unsigned int		bufsize6;	/* Bytes allocated. */
+	unsigned int		pos6;		/* Current offset in
+						   SIOCGLIFCONF data */
+	isc_result_t		result6;	/* Last result code. */
+	bool		first6;
+#endif
+#ifdef HAVE_TRUCLUSTER
+	int			clua_context;	/* Cluster alias context */
+	bool		clua_done;
+	struct sockaddr		clua_sa;
+#endif
+#ifdef	__linux
+	FILE *			proc;
+	char			entry[ISC_IF_INET6_SZ];
+	isc_result_t		valid;
+#endif
+	isc_interface_t		current;	/* Current interface data. */
+	isc_result_t		result;		/* Last result code. */
+};
+
+#ifdef HAVE_TRUCLUSTER
+#include <clua/clua.h>
+#include <sys/socket.h>
+#endif
+
+
+/*%
+ * Size of buffer for SIOCGLIFCONF, in bytes.  We assume no sane system
+ * will have more than a megabyte of interface configuration data.
+ */
+#define IFCONF_BUFSIZE_INITIAL	4096
+#define IFCONF_BUFSIZE_MAX	1048576
+
+#ifdef __linux
+#ifndef IF_NAMESIZE
+# ifdef IFNAMSIZ
+#  define IF_NAMESIZE  IFNAMSIZ
+# else
+#  define IF_NAMESIZE 16
+# endif
+#endif
+#endif
+
+static isc_result_t
+getbuf4(isc_interfaceiter_t *iter) {
+	char strbuf[ISC_STRERRORSIZE];
+
+	iter->bufsize = IFCONF_BUFSIZE_INITIAL;
+
+	for (;;) {
+		iter->buf = isc_mem_get(iter->mctx, iter->bufsize);
+		if (iter->buf == NULL)
+			return (ISC_R_NOMEMORY);
+
+		memset(&iter->ifc.ifc_len, 0, sizeof(iter->ifc.ifc_len));
+		iter->ifc.ifc_len = iter->bufsize;
+		iter->ifc.ifc_buf = iter->buf;
+		/*
+		 * Ignore the HP/UX warning about "integer overflow during
+		 * conversion".  It comes from its own macro definition,
+		 * and is really hard to shut up.
+		 */
+		if (ioctl(iter->socket, SIOCGIFCONF, (char *)&iter->ifc)
+		    == -1) {
+			if (errno != EINVAL) {
+				isc__strerror(errno, strbuf, sizeof(strbuf));
+				UNEXPECTED_ERROR(__FILE__, __LINE__,
+						 isc_msgcat_get(isc_msgcat,
+							ISC_MSGSET_IFITERIOCTL,
+							ISC_MSG_GETIFCONFIG,
+							"get interface "
+							"configuration: %s"),
+						 strbuf);
+				goto unexpected;
+			}
+			/*
+			 * EINVAL.  Retry with a bigger buffer.
+			 */
+		} else {
+			/*
+			 * The ioctl succeeded.
+			 * Some OS's just return what will fit rather
+			 * than set EINVAL if the buffer is too small
+			 * to fit all the interfaces in.  If
+			 * ifc.lifc_len is too near to the end of the
+			 * buffer we will grow it just in case and
+			 * retry.
+			 */
+			if (iter->ifc.ifc_len + 2 * sizeof(struct ifreq)
+			    < iter->bufsize)
+				break;
+		}
+		if (iter->bufsize >= IFCONF_BUFSIZE_MAX) {
+			UNEXPECTED_ERROR(__FILE__, __LINE__,
+					 isc_msgcat_get(isc_msgcat,
+							ISC_MSGSET_IFITERIOCTL,
+							ISC_MSG_BUFFERMAX,
+							"get interface "
+							"configuration: "
+							"maximum buffer "
+							"size exceeded"));
+			goto unexpected;
+		}
+		isc_mem_put(iter->mctx, iter->buf, iter->bufsize);
+
+		iter->bufsize *= 2;
+	}
+	return (ISC_R_SUCCESS);
+
+ unexpected:
+	isc_mem_put(iter->mctx, iter->buf, iter->bufsize);
+	iter->buf = NULL;
+	return (ISC_R_UNEXPECTED);
+}
+
+#if defined(SIOCGLIFCONF) && defined(SIOCGLIFADDR)
+static isc_result_t
+getbuf6(isc_interfaceiter_t *iter) {
+	char strbuf[ISC_STRERRORSIZE];
+	isc_result_t result;
+
+	iter->bufsize6 = IFCONF_BUFSIZE_INITIAL;
+
+	for (;;) {
+		iter->buf6 = isc_mem_get(iter->mctx, iter->bufsize6);
+		if (iter->buf6 == NULL)
+			return (ISC_R_NOMEMORY);
+
+		memset(&iter->lifc, 0, sizeof(iter->lifc));
+#ifdef ISC_HAVE_LIFC_FAMILY
+		iter->lifc.lifc_family = AF_INET6;
+#endif
+#ifdef ISC_HAVE_LIFC_FLAGS
+		iter->lifc.lifc_flags = 0;
+#endif
+		iter->lifc.lifc_len = iter->bufsize6;
+		iter->lifc.lifc_buf = iter->buf6;
+		/*
+		 * Ignore the HP/UX warning about "integer overflow during
+		 * conversion".  It comes from its own macro definition,
+		 * and is really hard to shut up.
+		 */
+		if (ioctl(iter->socket6, SIOCGLIFCONF, (char *)&iter->lifc)
+		    == -1) {
+#ifdef __hpux
+			/*
+			 * IPv6 interface scanning is not available on all
+			 * kernels w/ IPv6 sockets.
+			 */
+			if (errno == ENOENT) {
+				isc__strerror(errno, strbuf, sizeof(strbuf));
+				isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+					      ISC_LOGMODULE_INTERFACE,
+					      ISC_LOG_DEBUG(1),
+					      isc_msgcat_get(isc_msgcat,
+							ISC_MSGSET_IFITERIOCTL,
+							ISC_MSG_GETIFCONFIG,
+							"get interface "
+							"configuration: %s"),
+					       strbuf);
+				result = ISC_R_FAILURE;
+				goto cleanup;
+			}
+#endif
+			if (errno != EINVAL) {
+				isc__strerror(errno, strbuf, sizeof(strbuf));
+				UNEXPECTED_ERROR(__FILE__, __LINE__,
+						 isc_msgcat_get(isc_msgcat,
+							ISC_MSGSET_IFITERIOCTL,
+							ISC_MSG_GETIFCONFIG,
+							"get interface "
+							"configuration: %s"),
+						 strbuf);
+				result = ISC_R_UNEXPECTED;
+				goto cleanup;
+			}
+			/*
+			 * EINVAL.  Retry with a bigger buffer.
+			 */
+		} else {
+			/*
+			 * The ioctl succeeded.
+			 * Some OS's just return what will fit rather
+			 * than set EINVAL if the buffer is too small
+			 * to fit all the interfaces in.  If
+			 * ifc.ifc_len is too near to the end of the
+			 * buffer we will grow it just in case and
+			 * retry.
+			 */
+			if (iter->lifc.lifc_len + 2 * sizeof(struct LIFREQ)
+			    < iter->bufsize6)
+				break;
+		}
+		if (iter->bufsize6 >= IFCONF_BUFSIZE_MAX) {
+			UNEXPECTED_ERROR(__FILE__, __LINE__,
+					 isc_msgcat_get(isc_msgcat,
+							ISC_MSGSET_IFITERIOCTL,
+							ISC_MSG_BUFFERMAX,
+							"get interface "
+							"configuration: "
+							"maximum buffer "
+							"size exceeded"));
+			result = ISC_R_UNEXPECTED;
+			goto cleanup;
+		}
+		isc_mem_put(iter->mctx, iter->buf6, iter->bufsize6);
+
+		iter->bufsize6 *= 2;
+	}
+
+	if (iter->lifc.lifc_len != 0)
+		iter->mode = 6;
+	return (ISC_R_SUCCESS);
+
+ cleanup:
+	isc_mem_put(iter->mctx, iter->buf6, iter->bufsize6);
+	iter->buf6 = NULL;
+	return (result);
+}
+#endif
+
+isc_result_t
+isc_interfaceiter_create(isc_mem_t *mctx, isc_interfaceiter_t **iterp) {
+	isc_interfaceiter_t *iter;
+	isc_result_t result;
+	char strbuf[ISC_STRERRORSIZE];
+
+	REQUIRE(mctx != NULL);
+	REQUIRE(iterp != NULL);
+	REQUIRE(*iterp == NULL);
+
+	iter = isc_mem_get(mctx, sizeof(*iter));
+	if (iter == NULL)
+		return (ISC_R_NOMEMORY);
+
+	iter->mctx = mctx;
+	iter->mode = 4;
+	iter->buf = NULL;
+	iter->pos = (unsigned int) -1;
+#if defined(SIOCGLIFCONF) && defined(SIOCGLIFADDR)
+	iter->buf6 = NULL;
+	iter->pos6 = (unsigned int) -1;
+	iter->result6 = ISC_R_NOMORE;
+	iter->socket6 = -1;
+	iter->first6 = false;
+#endif
+
+	/*
+	 * Get the interface configuration, allocating more memory if
+	 * necessary.
+	 */
+
+#if defined(SIOCGLIFCONF) && defined(SIOCGLIFADDR)
+	result = isc_net_probeipv6();
+	if (result == ISC_R_SUCCESS) {
+		/*
+		 * Create an unbound datagram socket to do the SIOCGLIFCONF
+		 * ioctl on.  HP/UX requires an AF_INET6 socket for
+		 * SIOCGLIFCONF to get IPv6 addresses.
+		 */
+		if ((iter->socket6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
+			isc__strerror(errno, strbuf, sizeof(strbuf));
+			UNEXPECTED_ERROR(__FILE__, __LINE__,
+					 isc_msgcat_get(isc_msgcat,
+							ISC_MSGSET_IFITERIOCTL,
+							ISC_MSG_MAKESCANSOCKET,
+							"making interface "
+							"scan socket: %s"),
+					 strbuf);
+			result = ISC_R_UNEXPECTED;
+			goto socket6_failure;
+		}
+		result = iter->result6 = getbuf6(iter);
+		if (result != ISC_R_NOTIMPLEMENTED && result != ISC_R_SUCCESS)
+			goto ioctl6_failure;
+	}
+#endif
+	if ((iter->socket = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 isc_msgcat_get(isc_msgcat,
+						ISC_MSGSET_IFITERIOCTL,
+						ISC_MSG_MAKESCANSOCKET,
+						"making interface "
+						"scan socket: %s"),
+				 strbuf);
+		result = ISC_R_UNEXPECTED;
+		goto socket_failure;
+	}
+	result = getbuf4(iter);
+	if (result != ISC_R_SUCCESS)
+		goto ioctl_failure;
+
+	/*
+	 * A newly created iterator has an undefined position
+	 * until isc_interfaceiter_first() is called.
+	 */
+#ifdef HAVE_TRUCLUSTER
+	iter->clua_context = -1;
+	iter->clua_done = true;
+#endif
+#ifdef __linux
+	iter->proc = fopen("/proc/net/if_inet6", "r");
+	iter->valid = ISC_R_FAILURE;
+#endif
+	iter->result = ISC_R_FAILURE;
+
+	iter->magic = IFITER_MAGIC;
+	*iterp = iter;
+	return (ISC_R_SUCCESS);
+
+ ioctl_failure:
+	if (iter->buf != NULL)
+		isc_mem_put(mctx, iter->buf, iter->bufsize);
+	(void) close(iter->socket);
+
+ socket_failure:
+#if defined(SIOCGLIFCONF) && defined(SIOCGLIFADDR)
+	if (iter->buf6 != NULL)
+		isc_mem_put(mctx, iter->buf6, iter->bufsize6);
+  ioctl6_failure:
+	if (iter->socket6 != -1)
+		(void) close(iter->socket6);
+  socket6_failure:
+#endif
+
+	isc_mem_put(mctx, iter, sizeof(*iter));
+	return (result);
+}
+
+#ifdef HAVE_TRUCLUSTER
+static void
+get_inaddr(isc_netaddr_t *dst, struct in_addr *src) {
+	dst->family = AF_INET;
+	memmove(&dst->type.in, src, sizeof(struct in_addr));
+}
+
+static isc_result_t
+internal_current_clusteralias(isc_interfaceiter_t *iter) {
+	struct clua_info ci;
+	if (clua_getaliasinfo(&iter->clua_sa, &ci) != CLUA_SUCCESS)
+		return (ISC_R_IGNORE);
+	memset(&iter->current, 0, sizeof(iter->current));
+	iter->current.af = iter->clua_sa.sa_family;
+	memset(iter->current.name, 0, sizeof(iter->current.name));
+	snprintf(iter->current.name, sizeof(iter->current.name),
+		 "clua%d", ci.aliasid);
+	iter->current.flags = INTERFACE_F_UP;
+	get_inaddr(&iter->current.address, &ci.addr);
+	get_inaddr(&iter->current.netmask, &ci.netmask);
+	return (ISC_R_SUCCESS);
+}
+#endif
+
+/*
+ * Get information about the current interface to iter->current.
+ * If successful, return ISC_R_SUCCESS.
+ * If the interface has an unsupported address family, or if
+ * some operation on it fails, return ISC_R_IGNORE to make
+ * the higher-level iterator code ignore it.
+ */
+
+static isc_result_t
+internal_current4(isc_interfaceiter_t *iter) {
+	struct ifreq *ifrp;
+	struct ifreq ifreq;
+	int family;
+	char strbuf[ISC_STRERRORSIZE];
+#if !defined(ISC_PLATFORM_HAVEIF_LADDRREQ) && defined(SIOCGLIFADDR)
+	struct lifreq lifreq;
+#else
+	char sabuf[256];
+#endif
+	int i, bits, prefixlen;
+
+	REQUIRE(VALID_IFITER(iter));
+
+	if (iter->ifc.ifc_len == 0 ||
+	    iter->pos == (unsigned int)iter->ifc.ifc_len) {
+#ifdef __linux
+		return (linux_if_inet6_current(iter));
+#else
+		return (ISC_R_NOMORE);
+#endif
+	}
+
+	INSIST( iter->pos < (unsigned int) iter->ifc.ifc_len);
+
+	ifrp = (struct ifreq *)((char *) iter->ifc.ifc_req + iter->pos);
+
+	memset(&ifreq, 0, sizeof(ifreq));
+	memmove(&ifreq, ifrp, sizeof(ifreq));
+
+	family = ifreq.ifr_addr.sa_family;
+#if defined(ISC_PLATFORM_HAVEIPV6)
+	if (family != AF_INET && family != AF_INET6)
+#else
+	if (family != AF_INET)
+#endif
+		return (ISC_R_IGNORE);
+
+	memset(&iter->current, 0, sizeof(iter->current));
+	iter->current.af = family;
+
+	INSIST(sizeof(ifreq.ifr_name) <= sizeof(iter->current.name));
+	memset(iter->current.name, 0, sizeof(iter->current.name));
+	memmove(iter->current.name, ifreq.ifr_name, sizeof(ifreq.ifr_name));
+
+	get_addr(family, &iter->current.address,
+		 (struct sockaddr *)&ifrp->ifr_addr, ifreq.ifr_name);
+
+	/*
+	 * If the interface does not have a address ignore it.
+	 */
+	switch (family) {
+	case AF_INET:
+		if (iter->current.address.type.in.s_addr == htonl(INADDR_ANY))
+			return (ISC_R_IGNORE);
+		break;
+	case AF_INET6:
+		if (memcmp(&iter->current.address.type.in6, &in6addr_any,
+			   sizeof(in6addr_any)) == 0)
+			return (ISC_R_IGNORE);
+		break;
+	}
+
+	/*
+	 * Get interface flags.
+	 */
+
+	iter->current.flags = 0;
+
+	/*
+	 * Ignore the HP/UX warning about "integer overflow during
+	 * conversion.  It comes from its own macro definition,
+	 * and is really hard to shut up.
+	 */
+	if (ioctl(iter->socket, SIOCGIFFLAGS, (char *) &ifreq) < 0) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 "%s: getting interface flags: %s",
+				 ifreq.ifr_name, strbuf);
+		return (ISC_R_IGNORE);
+	}
+
+	if ((ifreq.ifr_flags & IFF_UP) != 0)
+		iter->current.flags |= INTERFACE_F_UP;
+
+#ifdef IFF_POINTOPOINT
+	if ((ifreq.ifr_flags & IFF_POINTOPOINT) != 0)
+		iter->current.flags |= INTERFACE_F_POINTTOPOINT;
+#endif
+
+	if ((ifreq.ifr_flags & IFF_LOOPBACK) != 0)
+		iter->current.flags |= INTERFACE_F_LOOPBACK;
+
+	if (family == AF_INET)
+		goto inet;
+
+#if !defined(ISC_PLATFORM_HAVEIF_LADDRREQ) && defined(SIOCGLIFADDR)
+	memset(&lifreq, 0, sizeof(lifreq));
+	memmove(lifreq.lifr_name, iter->current.name, sizeof(lifreq.lifr_name));
+	memmove(&lifreq.lifr_addr, &iter->current.address.type.in6,
+	       sizeof(iter->current.address.type.in6));
+
+	if (ioctl(iter->socket, SIOCGLIFADDR, &lifreq) < 0) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 "%s: getting interface address: %s",
+				 ifreq.ifr_name, strbuf);
+		return (ISC_R_IGNORE);
+	}
+	prefixlen = lifreq.lifr_addrlen;
+#else
+	isc_netaddr_format(&iter->current.address, sabuf, sizeof(sabuf));
+	isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+		      ISC_LOGMODULE_INTERFACE,
+		      ISC_LOG_INFO,
+		      isc_msgcat_get(isc_msgcat,
+				     ISC_MSGSET_IFITERIOCTL,
+				     ISC_MSG_GETIFCONFIG,
+				     "prefix length for %s is unknown "
+				     "(assume 128)"), sabuf);
+	prefixlen = 128;
+#endif
+
+	/*
+	 * Netmask already zeroed.
+	 */
+	iter->current.netmask.family = family;
+	for (i = 0; i < 16; i++) {
+		if (prefixlen > 8) {
+			bits = 0;
+			prefixlen -= 8;
+		} else {
+			bits = 8 - prefixlen;
+			prefixlen = 0;
+		}
+		iter->current.netmask.type.in6.s6_addr[i] =
+			(~0U << bits) & 0xff;
+	}
+	return (ISC_R_SUCCESS);
+
+ inet:
+	if (family != AF_INET)
+		return (ISC_R_IGNORE);
+#ifdef IFF_POINTOPOINT
+	/*
+	 * If the interface is point-to-point, get the destination address.
+	 */
+	if ((iter->current.flags & INTERFACE_F_POINTTOPOINT) != 0) {
+		/*
+		 * Ignore the HP/UX warning about "integer overflow during
+		 * conversion.  It comes from its own macro definition,
+		 * and is really hard to shut up.
+		 */
+		if (ioctl(iter->socket, SIOCGIFDSTADDR, (char *)&ifreq)
+		    < 0) {
+			isc__strerror(errno, strbuf, sizeof(strbuf));
+			UNEXPECTED_ERROR(__FILE__, __LINE__,
+				isc_msgcat_get(isc_msgcat,
+					       ISC_MSGSET_IFITERIOCTL,
+					       ISC_MSG_GETDESTADDR,
+					       "%s: getting "
+					       "destination address: %s"),
+					 ifreq.ifr_name, strbuf);
+			return (ISC_R_IGNORE);
+		}
+		get_addr(family, &iter->current.dstaddress,
+			 (struct sockaddr *)&ifreq.ifr_dstaddr, ifreq.ifr_name);
+	}
+#endif
+
+	/*
+	 * Get the network mask.
+	 */
+	memset(&ifreq, 0, sizeof(ifreq));
+	memmove(&ifreq, ifrp, sizeof(ifreq));
+	/*
+	 * Ignore the HP/UX warning about "integer overflow during
+	 * conversion.  It comes from its own macro definition,
+	 * and is really hard to shut up.
+	 */
+	if (ioctl(iter->socket, SIOCGIFNETMASK, (char *)&ifreq) < 0) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+			isc_msgcat_get(isc_msgcat,
+				       ISC_MSGSET_IFITERIOCTL,
+				       ISC_MSG_GETNETMASK,
+				       "%s: getting netmask: %s"),
+				       ifreq.ifr_name, strbuf);
+		return (ISC_R_IGNORE);
+	}
+	get_addr(family, &iter->current.netmask,
+		 (struct sockaddr *)&ifreq.ifr_addr, ifreq.ifr_name);
+	return (ISC_R_SUCCESS);
+}
+
+#if defined(SIOCGLIFCONF) && defined(SIOCGLIFADDR)
+static isc_result_t
+internal_current6(isc_interfaceiter_t *iter) {
+	struct LIFREQ *ifrp;
+	struct LIFREQ lifreq;
+	int family;
+	char strbuf[ISC_STRERRORSIZE];
+	int fd;
+
+	REQUIRE(VALID_IFITER(iter));
+	if (iter->result6 != ISC_R_SUCCESS)
+		return (iter->result6);
+	REQUIRE(iter->pos6 < (unsigned int) iter->lifc.lifc_len);
+
+	ifrp = (struct LIFREQ *)((char *) iter->lifc.lifc_req + iter->pos6);
+
+	memset(&lifreq, 0, sizeof(lifreq));
+	memmove(&lifreq, ifrp, sizeof(lifreq));
+
+	family = lifreq.lifr_addr.ss_family;
+#ifdef ISC_PLATFORM_HAVEIPV6
+	if (family != AF_INET && family != AF_INET6)
+#else
+	if (family != AF_INET)
+#endif
+		return (ISC_R_IGNORE);
+
+	memset(&iter->current, 0, sizeof(iter->current));
+	iter->current.af = family;
+
+	INSIST(sizeof(lifreq.lifr_name) <= sizeof(iter->current.name));
+	memset(iter->current.name, 0, sizeof(iter->current.name));
+	memmove(iter->current.name, lifreq.lifr_name, sizeof(lifreq.lifr_name));
+
+	get_addr(family, &iter->current.address,
+		 (struct sockaddr *)&lifreq.lifr_addr, lifreq.lifr_name);
+
+	/*
+	 * If the interface does not have a address ignore it.
+	 */
+	switch (family) {
+	case AF_INET:
+		if (iter->current.address.type.in.s_addr == htonl(INADDR_ANY))
+			return (ISC_R_IGNORE);
+		break;
+	case AF_INET6:
+		if (memcmp(&iter->current.address.type.in6, &in6addr_any,
+			   sizeof(in6addr_any)) == 0)
+			return (ISC_R_IGNORE);
+		break;
+	}
+
+	/*
+	 * Get interface flags.
+	 */
+
+	iter->current.flags = 0;
+
+	if (family == AF_INET6)
+		fd = iter->socket6;
+	else
+		fd = iter->socket;
+
+	/*
+	 * Ignore the HP/UX warning about "integer overflow during
+	 * conversion.  It comes from its own macro definition,
+	 * and is really hard to shut up.
+	 */
+	if (ioctl(fd, SIOCGLIFFLAGS, (char *) &lifreq) < 0) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 "%s: getting interface flags: %s",
+				 lifreq.lifr_name, strbuf);
+		return (ISC_R_IGNORE);
+	}
+
+	if ((lifreq.lifr_flags & IFF_UP) != 0)
+		iter->current.flags |= INTERFACE_F_UP;
+
+#ifdef IFF_POINTOPOINT
+	if ((lifreq.lifr_flags & IFF_POINTOPOINT) != 0)
+		iter->current.flags |= INTERFACE_F_POINTTOPOINT;
+#endif
+
+	if ((lifreq.lifr_flags & IFF_LOOPBACK) != 0)
+		iter->current.flags |= INTERFACE_F_LOOPBACK;
+
+#ifdef IFF_POINTOPOINT
+	/*
+	 * If the interface is point-to-point, get the destination address.
+	 */
+	if ((iter->current.flags & INTERFACE_F_POINTTOPOINT) != 0) {
+		/*
+		 * Ignore the HP/UX warning about "integer overflow during
+		 * conversion.  It comes from its own macro definition,
+		 * and is really hard to shut up.
+		 */
+		if (ioctl(fd, SIOCGLIFDSTADDR, (char *)&lifreq)
+		    < 0) {
+			isc__strerror(errno, strbuf, sizeof(strbuf));
+			UNEXPECTED_ERROR(__FILE__, __LINE__,
+				isc_msgcat_get(isc_msgcat,
+					       ISC_MSGSET_IFITERIOCTL,
+					       ISC_MSG_GETDESTADDR,
+					       "%s: getting "
+					       "destination address: %s"),
+					 lifreq.lifr_name, strbuf);
+			return (ISC_R_IGNORE);
+		}
+		get_addr(family, &iter->current.dstaddress,
+			 (struct sockaddr *)&lifreq.lifr_dstaddr,
+			 lifreq.lifr_name);
+	}
+#endif
+
+	/*
+	 * Get the network mask.  Netmask already zeroed.
+	 */
+	memset(&lifreq, 0, sizeof(lifreq));
+	memmove(&lifreq, ifrp, sizeof(lifreq));
+
+#ifdef lifr_addrlen
+	/*
+	 * Special case: if the system provides lifr_addrlen member, the
+	 * netmask of an IPv6 address can be derived from the length, since
+	 * an IPv6 address always has a contiguous mask.
+	 */
+	if (family == AF_INET6) {
+		int i, bits;
+
+		iter->current.netmask.family = family;
+		for (i = 0; i < lifreq.lifr_addrlen; i += 8) {
+			bits = lifreq.lifr_addrlen - i;
+			bits = (bits < 8) ? (8 - bits) : 0;
+			iter->current.netmask.type.in6.s6_addr[i / 8] =
+				(~0U << bits) & 0xff;
+		}
+
+		return (ISC_R_SUCCESS);
+	}
+#endif
+
+	/*
+	 * Ignore the HP/UX warning about "integer overflow during
+	 * conversion.  It comes from its own macro definition,
+	 * and is really hard to shut up.
+	 */
+	if (ioctl(fd, SIOCGLIFNETMASK, (char *)&lifreq) < 0) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 isc_msgcat_get(isc_msgcat,
+						ISC_MSGSET_IFITERIOCTL,
+						ISC_MSG_GETNETMASK,
+						"%s: getting netmask: %s"),
+				 lifreq.lifr_name, strbuf);
+		return (ISC_R_IGNORE);
+	}
+	get_addr(family, &iter->current.netmask,
+		 (struct sockaddr *)&lifreq.lifr_addr, lifreq.lifr_name);
+
+	return (ISC_R_SUCCESS);
+}
+#endif
+
+static isc_result_t
+internal_current(isc_interfaceiter_t *iter) {
+#if defined(SIOCGLIFCONF) && defined(SIOCGLIFADDR)
+	if (iter->mode == 6) {
+		iter->result6 = internal_current6(iter);
+		if (iter->result6 != ISC_R_NOMORE)
+			return (iter->result6);
+	}
+#endif
+#ifdef HAVE_TRUCLUSTER
+	if (!iter->clua_done)
+		return(internal_current_clusteralias(iter));
+#endif
+	return (internal_current4(iter));
+}
+
+/*
+ * Step the iterator to the next interface.  Unlike
+ * isc_interfaceiter_next(), this may leave the iterator
+ * positioned on an interface that will ultimately
+ * be ignored.  Return ISC_R_NOMORE if there are no more
+ * interfaces, otherwise ISC_R_SUCCESS.
+ */
+static isc_result_t
+internal_next4(isc_interfaceiter_t *iter) {
+#ifdef ISC_PLATFORM_HAVESALEN
+	struct ifreq *ifrp;
+#endif
+
+	if (iter->pos < (unsigned int) iter->ifc.ifc_len) {
+#ifdef ISC_PLATFORM_HAVESALEN
+		ifrp = (struct ifreq *)((char *) iter->ifc.ifc_req + iter->pos);
+
+		if (ifrp->ifr_addr.sa_len > sizeof(struct sockaddr))
+			iter->pos += sizeof(ifrp->ifr_name) +
+				     ifrp->ifr_addr.sa_len;
+		else
+#endif
+			iter->pos += sizeof(struct ifreq);
+
+	} else {
+		INSIST(iter->pos == (unsigned int) iter->ifc.ifc_len);
+#ifdef __linux
+		return (linux_if_inet6_next(iter));
+#else
+		return (ISC_R_NOMORE);
+#endif
+	}
+	return (ISC_R_SUCCESS);
+}
+
+#if defined(SIOCGLIFCONF) && defined(SIOCGLIFADDR)
+static isc_result_t
+internal_next6(isc_interfaceiter_t *iter) {
+#ifdef ISC_PLATFORM_HAVESALEN
+	struct LIFREQ *ifrp;
+#endif
+
+	if (iter->result6 != ISC_R_SUCCESS && iter->result6 != ISC_R_IGNORE)
+		return (iter->result6);
+
+	REQUIRE(iter->pos6 < (unsigned int) iter->lifc.lifc_len);
+
+#ifdef ISC_PLATFORM_HAVESALEN
+	ifrp = (struct LIFREQ *)((char *) iter->lifc.lifc_req + iter->pos6);
+
+	if (ifrp->lifr_addr.sa_len > sizeof(struct sockaddr))
+		iter->pos6 += sizeof(ifrp->lifr_name) + ifrp->lifr_addr.sa_len;
+	else
+#endif
+		iter->pos6 += sizeof(struct LIFREQ);
+
+	if (iter->pos6 >= (unsigned int) iter->lifc.lifc_len)
+		return (ISC_R_NOMORE);
+
+	return (ISC_R_SUCCESS);
+}
+#endif
+
+static isc_result_t
+internal_next(isc_interfaceiter_t *iter) {
+#ifdef HAVE_TRUCLUSTER
+	int clua_result;
+#endif
+#if defined(SIOCGLIFCONF) && defined(SIOCGLIFADDR)
+	if (iter->mode == 6) {
+		iter->result6 = internal_next6(iter);
+		if (iter->result6 != ISC_R_NOMORE)
+			return (iter->result6);
+		if (iter->first6) {
+			iter->first6 = false;
+			return (ISC_R_SUCCESS);
+		}
+	}
+#endif
+#ifdef HAVE_TRUCLUSTER
+	if (!iter->clua_done) {
+		clua_result = clua_getaliasaddress(&iter->clua_sa,
+						   &iter->clua_context);
+		if (clua_result != CLUA_SUCCESS)
+			iter->clua_done = true;
+		return (ISC_R_SUCCESS);
+	}
+#endif
+	return (internal_next4(iter));
+}
+
+static void
+internal_destroy(isc_interfaceiter_t *iter) {
+	(void) close(iter->socket);
+#if defined(SIOCGLIFCONF) && defined(SIOCGLIFADDR)
+	if (iter->socket6 != -1)
+		(void) close(iter->socket6);
+	if (iter->buf6 != NULL) {
+		isc_mem_put(iter->mctx, iter->buf6, iter->bufsize6);
+	}
+#endif
+#ifdef __linux
+	if (iter->proc != NULL)
+		fclose(iter->proc);
+#endif
+}
+
+static
+void internal_first(isc_interfaceiter_t *iter) {
+#ifdef HAVE_TRUCLUSTER
+	int clua_result;
+#endif
+	iter->pos = 0;
+#if defined(SIOCGLIFCONF) && defined(SIOCGLIFADDR)
+	iter->pos6 = 0;
+	if (iter->result6 == ISC_R_NOMORE)
+		iter->result6 = ISC_R_SUCCESS;
+	iter->first6 = true;
+#endif
+#ifdef HAVE_TRUCLUSTER
+	iter->clua_context = 0;
+	clua_result = clua_getaliasaddress(&iter->clua_sa,
+					   &iter->clua_context);
+	iter->clua_done = (clua_result != CLUA_SUCCESS);
+#endif
+#ifdef __linux
+	linux_if_inet6_first(iter);
+#endif
+}
diff --git a/lib/isc/unix/ifiter_sysctl.c b/lib/isc/unix/ifiter_sysctl.c
new file mode 100644
index 0000000..ebbefe9
--- /dev/null
+++ b/lib/isc/unix/ifiter_sysctl.c
@@ -0,0 +1,300 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+
+/*! \file
+ * \brief
+ * Obtain the list of network interfaces using sysctl.
+ * See TCP/IP Illustrated Volume 2, sections 19.8, 19.14,
+ * and 19.16.
+ */
+
+#include <inttypes.h>
+
+#include <sys/param.h>
+#include <sys/sysctl.h>
+
+#include <net/route.h>
+#include <net/if_dl.h>
+
+#include <isc/print.h>
+
+/* XXX what about Alpha? */
+#ifdef sgi
+#define ROUNDUP(a) ((a) > 0 ? \
+		(1 + (((a) - 1) | (sizeof(__uint64_t) - 1))) : \
+		sizeof(__uint64_t))
+#else
+#define ROUNDUP(a) ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) \
+		    : sizeof(long))
+#endif
+
+#define IFITER_MAGIC		ISC_MAGIC('I', 'F', 'I', 'S')
+#define VALID_IFITER(t)		ISC_MAGIC_VALID(t, IFITER_MAGIC)
+
+struct isc_interfaceiter {
+	unsigned int		magic;		/* Magic number. */
+	isc_mem_t		*mctx;
+	void			*buf;		/* Buffer for sysctl data. */
+	unsigned int		bufsize;	/* Bytes allocated. */
+	unsigned int		bufused;	/* Bytes used. */
+	unsigned int		pos;		/* Current offset in
+						   sysctl data. */
+	isc_interface_t		current;	/* Current interface data. */
+	isc_result_t		result;		/* Last result code. */
+};
+
+static int mib[6] = {
+	CTL_NET,
+	PF_ROUTE,
+	0,
+	0, 			/* Any address family. */
+	NET_RT_IFLIST,
+	0 			/* Flags. */
+};
+
+isc_result_t
+isc_interfaceiter_create(isc_mem_t *mctx, isc_interfaceiter_t **iterp) {
+	isc_interfaceiter_t *iter;
+	isc_result_t result;
+	size_t bufsize;
+	size_t bufused;
+	char strbuf[ISC_STRERRORSIZE];
+
+	REQUIRE(mctx != NULL);
+	REQUIRE(iterp != NULL);
+	REQUIRE(*iterp == NULL);
+
+	iter = isc_mem_get(mctx, sizeof(*iter));
+	if (iter == NULL)
+		return (ISC_R_NOMEMORY);
+
+	iter->mctx = mctx;
+	iter->buf = 0;
+
+	/*
+	 * Determine the amount of memory needed.
+	 */
+	bufsize = 0;
+	if (sysctl(mib, 6, NULL, &bufsize, NULL, (size_t) 0) < 0) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 isc_msgcat_get(isc_msgcat,
+						ISC_MSGSET_IFITERSYSCTL,
+						ISC_MSG_GETIFLISTSIZE,
+						"getting interface "
+						"list size: sysctl: %s"),
+				 strbuf);
+		result = ISC_R_UNEXPECTED;
+		goto failure;
+	}
+	iter->bufsize = bufsize;
+
+	iter->buf = isc_mem_get(iter->mctx, iter->bufsize);
+	if (iter->buf == NULL) {
+		result = ISC_R_NOMEMORY;
+		goto failure;
+	}
+
+	bufused = bufsize;
+	if (sysctl(mib, 6, iter->buf, &bufused, NULL, (size_t) 0) < 0) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 isc_msgcat_get(isc_msgcat,
+						ISC_MSGSET_IFITERSYSCTL,
+						ISC_MSG_GETIFLIST,
+						"getting interface list: "
+						"sysctl: %s"),
+				 strbuf);
+		result = ISC_R_UNEXPECTED;
+		goto failure;
+	}
+	iter->bufused = bufused;
+	INSIST(iter->bufused <= iter->bufsize);
+
+	/*
+	 * A newly created iterator has an undefined position
+	 * until isc_interfaceiter_first() is called.
+	 */
+	iter->pos = (unsigned int) -1;
+	iter->result = ISC_R_FAILURE;
+
+	iter->magic = IFITER_MAGIC;
+	*iterp = iter;
+	return (ISC_R_SUCCESS);
+
+ failure:
+	if (iter->buf != NULL)
+		isc_mem_put(mctx, iter->buf, iter->bufsize);
+	isc_mem_put(mctx, iter, sizeof(*iter));
+	return (result);
+}
+
+/*
+ * Get information about the current interface to iter->current.
+ * If successful, return ISC_R_SUCCESS.
+ * If the interface has an unsupported address family,
+ * return ISC_R_IGNORE.  In case of other failure,
+ * return ISC_R_UNEXPECTED.
+ */
+
+static isc_result_t
+internal_current(isc_interfaceiter_t *iter) {
+	struct ifa_msghdr *ifam, *ifam_end;
+
+	REQUIRE(VALID_IFITER(iter));
+	REQUIRE (iter->pos < (unsigned int) iter->bufused);
+
+	ifam = (struct ifa_msghdr *) ((char *) iter->buf + iter->pos);
+	ifam_end = (struct ifa_msghdr *) ((char *) iter->buf + iter->bufused);
+
+	if (ifam->ifam_type == RTM_IFINFO) {
+		struct if_msghdr *ifm = (struct if_msghdr *) ifam;
+		struct sockaddr_dl *sdl = (struct sockaddr_dl *) (ifm + 1);
+		unsigned int namelen;
+
+		memset(&iter->current, 0, sizeof(iter->current));
+
+		namelen = sdl->sdl_nlen;
+		if (namelen > sizeof(iter->current.name) - 1)
+			namelen = sizeof(iter->current.name) - 1;
+
+		memset(iter->current.name, 0, sizeof(iter->current.name));
+		memmove(iter->current.name, sdl->sdl_data, namelen);
+
+		iter->current.flags = 0;
+
+		if ((ifam->ifam_flags & IFF_UP) != 0)
+			iter->current.flags |= INTERFACE_F_UP;
+
+		if ((ifam->ifam_flags & IFF_POINTOPOINT) != 0)
+			iter->current.flags |= INTERFACE_F_POINTTOPOINT;
+
+		if ((ifam->ifam_flags & IFF_LOOPBACK) != 0)
+			iter->current.flags |= INTERFACE_F_LOOPBACK;
+
+		/*
+		 * This is not an interface address.
+		 * Force another iteration.
+		 */
+		return (ISC_R_IGNORE);
+	} else if (ifam->ifam_type == RTM_NEWADDR) {
+		int i;
+		int family;
+		struct sockaddr *mask_sa = NULL;
+		struct sockaddr *addr_sa = NULL;
+		struct sockaddr *dst_sa = NULL;
+
+		struct sockaddr *sa = (struct sockaddr *)(ifam + 1);
+		family = sa->sa_family;
+
+		for (i = 0; i < RTAX_MAX; i++)
+		{
+			if ((ifam->ifam_addrs & (1 << i)) == 0)
+				continue;
+
+			INSIST(sa < (struct sockaddr *) ifam_end);
+
+			switch (i) {
+			case RTAX_NETMASK: /* Netmask */
+				mask_sa = sa;
+				break;
+			case RTAX_IFA: /* Interface address */
+				addr_sa = sa;
+				break;
+			case RTAX_BRD: /* Broadcast or destination address */
+				dst_sa = sa;
+				break;
+			}
+#ifdef ISC_PLATFORM_HAVESALEN
+			sa = (struct sockaddr *)((char*)(sa)
+					 + ROUNDUP(sa->sa_len));
+#else
+#ifdef sgi
+			/*
+			 * Do as the contributed SGI code does.
+			 */
+			sa = (struct sockaddr *)((char*)(sa)
+					 + ROUNDUP(_FAKE_SA_LEN_DST(sa)));
+#else
+			/* XXX untested. */
+			sa = (struct sockaddr *)((char*)(sa)
+					 + ROUNDUP(sizeof(struct sockaddr)));
+#endif
+#endif
+		}
+
+		if (addr_sa == NULL)
+			return (ISC_R_IGNORE);
+
+		family = addr_sa->sa_family;
+		if (family != AF_INET && family != AF_INET6)
+			return (ISC_R_IGNORE);
+
+		iter->current.af = family;
+
+		get_addr(family, &iter->current.address, addr_sa,
+			 iter->current.name);
+
+		if (mask_sa != NULL)
+			get_addr(family, &iter->current.netmask, mask_sa,
+				 iter->current.name);
+
+		if (dst_sa != NULL &&
+		    (iter->current.flags & INTERFACE_F_POINTTOPOINT) != 0)
+			get_addr(family, &iter->current.dstaddress, dst_sa,
+				 iter->current.name);
+
+		return (ISC_R_SUCCESS);
+	} else {
+		printf("%s",
+		       isc_msgcat_get(isc_msgcat, ISC_MSGSET_IFITERSYSCTL,
+				      ISC_MSG_UNEXPECTEDTYPE,
+				      "warning: unexpected interface list "
+				      "message type\n"));
+		return (ISC_R_IGNORE);
+	}
+}
+
+/*
+ * Step the iterator to the next interface.  Unlike
+ * isc_interfaceiter_next(), this may leave the iterator
+ * positioned on an interface that will ultimately
+ * be ignored.  Return ISC_R_NOMORE if there are no more
+ * interfaces, otherwise ISC_R_SUCCESS.
+ */
+static isc_result_t
+internal_next(isc_interfaceiter_t *iter) {
+	struct ifa_msghdr *ifam;
+	REQUIRE (iter->pos < (unsigned int) iter->bufused);
+
+	ifam = (struct ifa_msghdr *) ((char *) iter->buf + iter->pos);
+
+	iter->pos += ifam->ifam_msglen;
+
+	if (iter->pos >= iter->bufused)
+		return (ISC_R_NOMORE);
+
+	return (ISC_R_SUCCESS);
+}
+
+static void
+internal_destroy(isc_interfaceiter_t *iter) {
+	UNUSED(iter); /* Unused. */
+	/*
+	 * Do nothing.
+	 */
+}
+
+static
+void internal_first(isc_interfaceiter_t *iter) {
+	iter->pos = 0;
+}
diff --git a/lib/isc/unix/include/Makefile.in b/lib/isc/unix/include/Makefile.in
new file mode 100644
index 0000000..2cbf021
--- /dev/null
+++ b/lib/isc/unix/include/Makefile.in
@@ -0,0 +1,17 @@
+# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+#
+# See the COPYRIGHT file distributed with this work for additional
+# information regarding copyright ownership.
+
+srcdir =	@srcdir@
+VPATH =		@srcdir@
+top_srcdir =	@top_srcdir@
+
+SUBDIRS =	isc pkcs11
+TARGETS =
+
+@BIND9_MAKE_RULES@
diff --git a/lib/isc/unix/include/isc/Makefile.in b/lib/isc/unix/include/isc/Makefile.in
new file mode 100644
index 0000000..977defe
--- /dev/null
+++ b/lib/isc/unix/include/isc/Makefile.in
@@ -0,0 +1,35 @@
+# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+#
+# See the COPYRIGHT file distributed with this work for additional
+# information regarding copyright ownership.
+
+srcdir =	@srcdir@
+VPATH =		@srcdir@
+top_srcdir =	@top_srcdir@
+
+VERSION=@BIND9_VERSION@
+
+HEADERS =	dir.h keyboard.h net.h netdb.h offset.h stat.h \
+		stdtime.h strerror.h syslog.h time.h
+
+SUBDIRS =
+TARGETS =
+
+@BIND9_MAKE_RULES@
+
+installdirs:
+	$(SHELL) ${top_srcdir}/mkinstalldirs ${DESTDIR}${includedir}/isc
+
+install:: installdirs
+	for i in ${HEADERS}; do \
+		${INSTALL_DATA} $(srcdir)/$$i ${DESTDIR}${includedir}/isc || exit 1; \
+	done
+
+uninstall::
+	for i in ${HEADERS}; do \
+		rm -f ${DESTDIR}${includedir}/isc/$$i || exit 1; \
+	done
diff --git a/lib/isc/unix/include/isc/dir.h b/lib/isc/unix/include/isc/dir.h
new file mode 100644
index 0000000..36d0aad
--- /dev/null
+++ b/lib/isc/unix/include/isc/dir.h
@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+#ifndef ISC_DIR_H
+#define ISC_DIR_H 1
+
+/*! \file */
+
+#include <sys/types.h>		/* Required on some systems. */
+#include <dirent.h>
+
+#include <isc/lang.h>
+#include <isc/result.h>
+
+#define ISC_DIR_NAMEMAX 256
+#define ISC_DIR_PATHMAX 1024
+
+/*% Directory Entry */
+typedef struct isc_direntry {
+	/*!
+	 * Ideally, this should be NAME_MAX, but AIX does not define it by
+	 * default and dynamically allocating the space based on pathconf()
+	 * complicates things undesirably, as does adding special conditionals
+	 * just for AIX.  So a comfortably sized buffer is chosen instead.
+	 */
+	char 		name[ISC_DIR_NAMEMAX];
+	unsigned int	length;
+} isc_direntry_t;
+
+/*% Directory */
+typedef struct isc_dir {
+	unsigned int	magic;
+	/*!
+	 * As with isc_direntry_t->name, making this "right" for all systems
+	 * is slightly problematic because AIX does not define PATH_MAX.
+	 */
+	char		dirname[ISC_DIR_PATHMAX];
+	isc_direntry_t	entry;
+	DIR *		handle;
+} isc_dir_t;
+
+ISC_LANG_BEGINDECLS
+
+void
+isc_dir_init(isc_dir_t *dir);
+
+isc_result_t
+isc_dir_open(isc_dir_t *dir, const char *dirname);
+
+isc_result_t
+isc_dir_read(isc_dir_t *dir);
+
+isc_result_t
+isc_dir_reset(isc_dir_t *dir);
+
+void
+isc_dir_close(isc_dir_t *dir);
+
+isc_result_t
+isc_dir_chdir(const char *dirname);
+
+isc_result_t
+isc_dir_chroot(const char *dirname);
+
+isc_result_t
+isc_dir_createunique(char *templet);
+/*!<
+ * Use a templet (such as from isc_file_mktemplate()) to create a uniquely
+ * named, empty directory.  The templet string is modified in place.
+ * If result == ISC_R_SUCCESS, it is the name of the directory that was
+ * created.
+ */
+
+ISC_LANG_ENDDECLS
+
+#endif /* ISC_DIR_H */
diff --git a/lib/isc/unix/include/isc/keyboard.h b/lib/isc/unix/include/isc/keyboard.h
new file mode 100644
index 0000000..4dc8745
--- /dev/null
+++ b/lib/isc/unix/include/isc/keyboard.h
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+
+#ifndef ISC_KEYBOARD_H
+#define ISC_KEYBOARD_H 1
+
+/*! \file */
+
+#include <stdbool.h>
+#include <termios.h>
+
+#include <isc/lang.h>
+#include <isc/result.h>
+
+ISC_LANG_BEGINDECLS
+
+typedef struct {
+	int fd;
+	struct termios saved_mode;
+	isc_result_t result;
+} isc_keyboard_t;
+
+isc_result_t
+isc_keyboard_open(isc_keyboard_t *keyboard);
+
+isc_result_t
+isc_keyboard_close(isc_keyboard_t *keyboard, unsigned int sleepseconds);
+
+isc_result_t
+isc_keyboard_getchar(isc_keyboard_t *keyboard, unsigned char *cp);
+
+bool
+isc_keyboard_canceled(isc_keyboard_t *keyboard);
+
+ISC_LANG_ENDDECLS
+
+#endif /* ISC_KEYBOARD_H */
diff --git a/lib/isc/unix/include/isc/net.h b/lib/isc/unix/include/isc/net.h
new file mode 100644
index 0000000..08be590
--- /dev/null
+++ b/lib/isc/unix/include/isc/net.h
@@ -0,0 +1,417 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+
+#ifndef ISC_NET_H
+#define ISC_NET_H 1
+
+/*****
+ ***** Module Info
+ *****/
+
+/*! \file
+ * \brief
+ * Basic Networking Types
+ *
+ * This module is responsible for defining the following basic networking
+ * types:
+ *
+ *\li		struct in_addr
+ *\li		struct in6_addr
+ *\li		struct in6_pktinfo
+ *\li		struct sockaddr
+ *\li		struct sockaddr_in
+ *\li		struct sockaddr_in6
+ *\li		struct sockaddr_storage
+ *\li		in_port_t
+ *
+ * It ensures that the AF_ and PF_ macros are defined.
+ *
+ * It declares ntoh[sl]() and hton[sl]().
+ *
+ * It declares inet_aton(), inet_ntop(), and inet_pton().
+ *
+ * It ensures that #INADDR_LOOPBACK, #INADDR_ANY, #IN6ADDR_ANY_INIT,
+ * IN6ADDR_V4MAPPED_INIT, in6addr_any, and in6addr_loopback are available.
+ *
+ * It ensures that IN_MULTICAST() is available to check for multicast
+ * addresses.
+ *
+ * MP:
+ *\li	No impact.
+ *
+ * Reliability:
+ *\li	No anticipated impact.
+ *
+ * Resources:
+ *\li	N/A.
+ *
+ * Security:
+ *\li	No anticipated impact.
+ *
+ * Standards:
+ *\li	BSD Socket API
+ *\li	RFC2553
+ */
+
+/***
+ *** Imports.
+ ***/
+#include <isc/platform.h>
+
+#include <inttypes.h>
+
+#include <sys/types.h>
+#include <sys/socket.h>		/* Contractual promise. */
+
+#include <net/if.h>
+
+#include <netinet/in.h>		/* Contractual promise. */
+#include <arpa/inet.h>		/* Contractual promise. */
+#ifdef ISC_PLATFORM_NEEDNETINETIN6H
+#include <netinet/in6.h>	/* Required on UnixWare. */
+#endif
+#ifdef ISC_PLATFORM_NEEDNETINET6IN6H
+#include <netinet6/in6.h>	/* Required on BSD/OS for in6_pktinfo. */
+#endif
+
+#ifndef ISC_PLATFORM_HAVEIPV6
+#include <isc/ipv6.h>		/* Contractual promise. */
+#endif
+
+#include <isc/lang.h>
+#include <isc/types.h>
+
+#ifdef ISC_PLATFORM_HAVEINADDR6
+#define in6_addr in_addr6	/*%< Required for pre RFC2133 implementations. */
+#endif
+
+#ifdef ISC_PLATFORM_HAVEIPV6
+#ifndef IN6ADDR_ANY_INIT
+#ifdef s6_addr
+/*%
+ * Required for some pre RFC2133 implementations.
+ * IN6ADDR_ANY_INIT and IN6ADDR_LOOPBACK_INIT were added in
+ * draft-ietf-ipngwg-bsd-api-04.txt or draft-ietf-ipngwg-bsd-api-05.txt.
+ * If 's6_addr' is defined then assume that there is a union and three
+ * levels otherwise assume two levels required.
+ */
+#define IN6ADDR_ANY_INIT { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } } }
+#else
+#define IN6ADDR_ANY_INIT { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } }
+#endif
+#endif
+
+#ifndef IN6ADDR_LOOPBACK_INIT
+#ifdef s6_addr
+/*% IPv6 address loopback init */
+#define IN6ADDR_LOOPBACK_INIT { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 } } }
+#else
+#define IN6ADDR_LOOPBACK_INIT { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 } }
+#endif
+#endif
+
+#ifndef IN6ADDR_V4MAPPED_INIT
+#ifdef s6_addr
+/*% IPv6 v4mapped prefix init */
+#define IN6ADDR_V4MAPPED_INIT { { { 0,0,0,0,0,0,0,0,0,0,0xff,0xff,0,0,0,0 } } }
+#else
+#define IN6ADDR_V4MAPPED_INIT { { 0,0,0,0,0,0,0,0,0,0,0xff,0xff,0,0,0,0 } }
+#endif
+#endif
+
+#ifndef IN6_IS_ADDR_V4MAPPED
+/*% Is IPv6 address V4 mapped? */
+#define IN6_IS_ADDR_V4MAPPED(x) \
+	 (memcmp((x)->s6_addr, in6addr_any.s6_addr, 10) == 0 && \
+	  (x)->s6_addr[10] == 0xff && (x)->s6_addr[11] == 0xff)
+#endif
+
+#ifndef IN6_IS_ADDR_V4COMPAT
+/*% Is IPv6 address V4 compatible? */
+#define IN6_IS_ADDR_V4COMPAT(x) \
+	 (memcmp((x)->s6_addr, in6addr_any.s6_addr, 12) == 0 && \
+	 ((x)->s6_addr[12] != 0 || (x)->s6_addr[13] != 0 || \
+	  (x)->s6_addr[14] != 0 || \
+	  ((x)->s6_addr[15] != 0 && (x)->s6_addr[15] != 1)))
+#endif
+
+#ifndef IN6_IS_ADDR_MULTICAST
+/*% Is IPv6 address multicast? */
+#define IN6_IS_ADDR_MULTICAST(a)        ((a)->s6_addr[0] == 0xff)
+#endif
+
+#ifndef IN6_IS_ADDR_LINKLOCAL
+/*% Is IPv6 address linklocal? */
+#define IN6_IS_ADDR_LINKLOCAL(a) \
+	(((a)->s6_addr[0] == 0xfe) && (((a)->s6_addr[1] & 0xc0) == 0x80))
+#endif
+
+#ifndef IN6_IS_ADDR_SITELOCAL
+/*% is IPv6 address sitelocal? */
+#define IN6_IS_ADDR_SITELOCAL(a) \
+	(((a)->s6_addr[0] == 0xfe) && (((a)->s6_addr[1] & 0xc0) == 0xc0))
+#endif
+
+
+#ifndef IN6_IS_ADDR_LOOPBACK
+/*% is IPv6 address loopback? */
+#define IN6_IS_ADDR_LOOPBACK(x) \
+	(memcmp((x)->s6_addr, in6addr_loopback.s6_addr, 16) == 0)
+#endif
+#endif
+
+#ifndef AF_INET6
+/*% IPv6 */
+#define AF_INET6 99
+#endif
+
+#ifndef PF_INET6
+/*% IPv6 */
+#define PF_INET6 AF_INET6
+#endif
+
+#ifndef INADDR_ANY
+/*% inaddr any */
+#define INADDR_ANY 0x00000000UL
+#endif
+
+#ifndef INADDR_LOOPBACK
+/*% inaddr loopback */
+#define INADDR_LOOPBACK 0x7f000001UL
+#endif
+
+#ifndef ISC_PLATFORM_HAVEIN6PKTINFO
+/*% IPv6 packet info */
+struct in6_pktinfo {
+	struct in6_addr ipi6_addr;    /*%< src/dst IPv6 address */
+	unsigned int    ipi6_ifindex; /*%< send/recv interface index */
+};
+#endif
+
+
+#ifndef ISC_PLATFORM_HAVESOCKADDRSTORAGE
+#define _SS_MAXSIZE 128
+#define _SS_ALIGNSIZE  (sizeof (uint64_t))
+#ifdef ISC_PLATFORM_HAVESALEN
+#define _SS_PAD1SIZE (_SS_ALIGNSIZE - (2 * sizeof(uint8_t)))
+#define _SS_PAD2SIZE (_SS_MAXSIZE - (_SS_ALIGNSIZE + _SS_PAD1SIZE \
+		       + 2 * sizeof(uint8_t)))
+#else
+#define _SS_PAD1SIZE (_SS_ALIGNSIZE - sizeof(uint16_t))
+#define _SS_PAD2SIZE (_SS_MAXSIZE - (_SS_ALIGNSIZE + _SS_PAD1SIZE \
+			+ sizeof(uint16_t)))
+#endif
+
+struct sockaddr_storage {
+#ifdef ISC_PLATFORM_HAVESALEN
+       uint8_t             ss_len;
+       uint8_t             ss_family;
+#else
+       uint16_t            ss_family;
+#endif
+       char                    __ss_pad1[_SS_PAD1SIZE];
+       uint64_t            __ss_align;  /* field to force desired structure */
+       char                    __ss_pad2[_SS_PAD2SIZE];
+};
+#endif
+
+#if defined(ISC_PLATFORM_HAVEIPV6) && defined(ISC_PLATFORM_NEEDIN6ADDRANY)
+extern const struct in6_addr isc_net_in6addrany;
+/*%
+ * Cope with a missing in6addr_any and in6addr_loopback.
+ */
+#define in6addr_any isc_net_in6addrany
+#endif
+
+#if defined(ISC_PLATFORM_HAVEIPV6) && defined(ISC_PLATFORM_NEEDIN6ADDRLOOPBACK)
+extern const struct in6_addr isc_net_in6addrloop;
+#define in6addr_loopback isc_net_in6addrloop
+#endif
+
+#ifdef ISC_PLATFORM_FIXIN6ISADDR
+#undef  IN6_IS_ADDR_GEOGRAPHIC
+/*!
+ * \brief
+ * Fix UnixWare 7.1.1's broken IN6_IS_ADDR_* definitions.
+ */
+#define IN6_IS_ADDR_GEOGRAPHIC(a) (((a)->S6_un.S6_l[0] & 0xE0) == 0x80)
+#undef  IN6_IS_ADDR_IPX
+#define IN6_IS_ADDR_IPX(a)        (((a)->S6_un.S6_l[0] & 0xFE) == 0x04)
+#undef  IN6_IS_ADDR_LINKLOCAL
+#define IN6_IS_ADDR_LINKLOCAL(a)  (((a)->S6_un.S6_l[0] & 0xC0FF) == 0x80FE)
+#undef  IN6_IS_ADDR_MULTICAST
+#define IN6_IS_ADDR_MULTICAST(a)  (((a)->S6_un.S6_l[0] & 0xFF) == 0xFF)
+#undef  IN6_IS_ADDR_NSAP
+#define IN6_IS_ADDR_NSAP(a)       (((a)->S6_un.S6_l[0] & 0xFE) == 0x02)
+#undef  IN6_IS_ADDR_PROVIDER
+#define IN6_IS_ADDR_PROVIDER(a)   (((a)->S6_un.S6_l[0] & 0xE0) == 0x40)
+#undef  IN6_IS_ADDR_SITELOCAL
+#define IN6_IS_ADDR_SITELOCAL(a)  (((a)->S6_un.S6_l[0] & 0xC0FF) == 0xC0FE)
+#endif /* ISC_PLATFORM_FIXIN6ISADDR */
+
+#ifdef ISC_PLATFORM_NEEDPORTT
+/*%
+ * Ensure type in_port_t is defined.
+ */
+typedef uint16_t in_port_t;
+#endif
+
+#ifndef MSG_TRUNC
+/*%
+ * If this system does not have MSG_TRUNC (as returned from recvmsg())
+ * ISC_PLATFORM_RECVOVERFLOW will be defined.  This will enable the MSG_TRUNC
+ * faking code in socket.c.
+ */
+#define ISC_PLATFORM_RECVOVERFLOW
+#endif
+
+/*% IP address. */
+#define ISC__IPADDR(x)	((uint32_t)htonl((uint32_t)(x)))
+
+/*% Is IP address multicast? */
+#define ISC_IPADDR_ISMULTICAST(i) \
+		(((uint32_t)(i) & ISC__IPADDR(0xf0000000)) \
+		 == ISC__IPADDR(0xe0000000))
+
+#define ISC_IPADDR_ISEXPERIMENTAL(i) \
+		(((uint32_t)(i) & ISC__IPADDR(0xf0000000)) \
+		 == ISC__IPADDR(0xf0000000))
+
+/***
+ *** Functions.
+ ***/
+
+ISC_LANG_BEGINDECLS
+
+isc_result_t
+isc_net_probeipv4(void);
+/*%<
+ * Check if the system's kernel supports IPv4.
+ *
+ * Returns:
+ *
+ *\li	#ISC_R_SUCCESS		IPv4 is supported.
+ *\li	#ISC_R_NOTFOUND		IPv4 is not supported.
+ *\li	#ISC_R_DISABLED		IPv4 is disabled.
+ *\li	#ISC_R_UNEXPECTED
+ */
+
+isc_result_t
+isc_net_probeipv6(void);
+/*%<
+ * Check if the system's kernel supports IPv6.
+ *
+ * Returns:
+ *
+ *\li	#ISC_R_SUCCESS		IPv6 is supported.
+ *\li	#ISC_R_NOTFOUND		IPv6 is not supported.
+ *\li	#ISC_R_DISABLED		IPv6 is disabled.
+ *\li	#ISC_R_UNEXPECTED
+ */
+
+isc_result_t
+isc_net_probe_ipv6only(void);
+/*%<
+ * Check if the system's kernel supports the IPV6_V6ONLY socket option.
+ *
+ * Returns:
+ *
+ *\li	#ISC_R_SUCCESS		the option is supported for both TCP and UDP.
+ *\li	#ISC_R_NOTFOUND		IPv6 itself or the option is not supported.
+ *\li	#ISC_R_UNEXPECTED
+ */
+
+isc_result_t
+isc_net_probe_ipv6pktinfo(void);
+/*
+ * Check if the system's kernel supports the IPV6_(RECV)PKTINFO socket option
+ * for UDP sockets.
+ *
+ * Returns:
+ *
+ * \li	#ISC_R_SUCCESS		the option is supported.
+ * \li	#ISC_R_NOTFOUND		IPv6 itself or the option is not supported.
+ * \li	#ISC_R_UNEXPECTED
+ */
+
+void
+isc_net_disableipv4(void);
+
+void
+isc_net_disableipv6(void);
+
+void
+isc_net_enableipv4(void);
+
+void
+isc_net_enableipv6(void);
+
+isc_result_t
+isc_net_probeunix(void);
+/*
+ * Returns whether UNIX domain sockets are supported.
+ */
+
+#define ISC_NET_DSCPRECVV4	0x01	/* Can receive sent DSCP value IPv4 */
+#define ISC_NET_DSCPRECVV6	0x02	/* Can receive sent DSCP value IPv6 */
+#define ISC_NET_DSCPSETV4	0x04	/* Can set DSCP on socket IPv4 */
+#define ISC_NET_DSCPSETV6	0x08	/* Can set DSCP on socket IPv6 */
+#define ISC_NET_DSCPPKTV4	0x10	/* Can set DSCP on per packet IPv4 */
+#define ISC_NET_DSCPPKTV6	0x20	/* Can set DSCP on per packet IPv6 */
+#define ISC_NET_DSCPALL		0x3f	/* All valid flags */
+
+unsigned int
+isc_net_probedscp(void);
+/*%<
+ * Probe the level of DSCP support.
+ */
+
+
+isc_result_t
+isc_net_getudpportrange(int af, in_port_t *low, in_port_t *high);
+/*%<
+ * Returns system's default range of ephemeral UDP ports, if defined.
+ * If the range is not available or unknown, ISC_NET_PORTRANGELOW and
+ * ISC_NET_PORTRANGEHIGH will be returned.
+ *
+ * Requires:
+ *
+ *\li	'low' and 'high' must be non NULL.
+ *
+ * Returns:
+ *
+ *\li	*low and *high will be the ports specifying the low and high ends of
+ *	the range.
+ */
+
+#ifdef ISC_PLATFORM_NEEDNTOP
+const char *
+isc_net_ntop(int af, const void *src, char *dst, size_t size);
+#undef inet_ntop
+#define inet_ntop isc_net_ntop
+#endif
+
+#ifdef ISC_PLATFORM_NEEDPTON
+int
+isc_net_pton(int af, const char *src, void *dst);
+#undef inet_pton
+#define inet_pton isc_net_pton
+#endif
+
+int
+isc_net_aton(const char *cp, struct in_addr *addr);
+#undef inet_aton
+#define inet_aton isc_net_aton
+
+ISC_LANG_ENDDECLS
+
+#endif /* ISC_NET_H */
diff --git a/lib/isc/unix/include/isc/netdb.h b/lib/isc/unix/include/isc/netdb.h
new file mode 100644
index 0000000..5aaa9f6
--- /dev/null
+++ b/lib/isc/unix/include/isc/netdb.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+
+#ifndef ISC_NETDB_H
+#define ISC_NETDB_H 1
+
+/*****
+ ***** Module Info
+ *****/
+
+/*! \file
+ * \brief
+ * Portable netdb.h support.
+ *
+ * This module is responsible for defining the get<x>by<y> APIs.
+ *
+ * MP:
+ *\li	No impact.
+ *
+ * Reliability:
+ *\li	No anticipated impact.
+ *
+ * Resources:
+ *\li	N/A.
+ *
+ * Security:
+ *\li	No anticipated impact.
+ *
+ * Standards:
+ *\li	BSD API
+ */
+
+/***
+ *** Imports.
+ ***/
+
+#include <isc/net.h>
+
+#include <netdb.h>
+
+#endif /* ISC_NETDB_H */
diff --git a/lib/isc/unix/include/isc/offset.h b/lib/isc/unix/include/isc/offset.h
new file mode 100644
index 0000000..cf57292
--- /dev/null
+++ b/lib/isc/unix/include/isc/offset.h
@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+
+#ifndef ISC_OFFSET_H
+#define ISC_OFFSET_H 1
+
+/*! \file
+ * \brief
+ * File offsets are operating-system dependent.
+ */
+#include <limits.h>             /* Required for CHAR_BIT. */
+#include <sys/types.h>
+#include <stddef.h>		/* For Linux Standard Base. */
+
+typedef off_t isc_offset_t;
+
+#endif /* ISC_OFFSET_H */
diff --git a/lib/isc/unix/include/isc/stat.h b/lib/isc/unix/include/isc/stat.h
new file mode 100644
index 0000000..24c4ce5
--- /dev/null
+++ b/lib/isc/unix/include/isc/stat.h
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+
+#ifndef ISC_STAT_H
+#define ISC_STAT_H 1
+
+/*****
+ ***** Module Info
+ *****/
+
+/*
+ * Portable <sys/stat.h> support.
+ *
+ * This module is responsible for defining S_IS??? macros.
+ *
+ * MP:
+ *	No impact.
+ *
+ * Reliability:
+ *	No anticipated impact.
+ *
+ * Resources:
+ *	N/A.
+ *
+ * Security:
+ *	No anticipated impact.
+ *
+ */
+
+/***
+ *** Imports.
+ ***/
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#endif /* ISC_STAT_H */
diff --git a/lib/isc/unix/include/isc/stdtime.h b/lib/isc/unix/include/isc/stdtime.h
new file mode 100644
index 0000000..1a3da82
--- /dev/null
+++ b/lib/isc/unix/include/isc/stdtime.h
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+
+#ifndef ISC_STDTIME_H
+#define ISC_STDTIME_H 1
+
+/*! \file */
+
+#include <isc/lang.h>
+#include <inttypes.h>
+
+/*%
+ * It's public information that 'isc_stdtime_t' is an unsigned integral type.
+ * Applications that want maximum portability should not assume anything
+ * about its size.
+ */
+typedef uint32_t isc_stdtime_t;
+
+/* but this flag helps... */
+#define STDTIME_ON_32BITS	1
+
+/*
+ * isc_stdtime32_t is a 32-bit version of isc_stdtime_t.  A variable of this
+ * type should only be used as an opaque integer (e.g.,) to compare two
+ * time values.
+ */
+typedef uint32_t isc_stdtime32_t;
+
+ISC_LANG_BEGINDECLS
+/* */
+void
+isc_stdtime_get(isc_stdtime_t *t);
+/*%<
+ * Set 't' to the number of seconds since 00:00:00 UTC, January 1, 1970.
+ *
+ * Requires:
+ *
+ *\li	't' is a valid pointer.
+ */
+
+#define isc_stdtime_convert32(t, t32p) (*(t32p) = t)
+/*
+ * Convert the standard time to its 32-bit version.
+ */
+
+ISC_LANG_ENDDECLS
+
+#endif /* ISC_STDTIME_H */
diff --git a/lib/isc/unix/include/isc/strerror.h b/lib/isc/unix/include/isc/strerror.h
new file mode 100644
index 0000000..fa0e429
--- /dev/null
+++ b/lib/isc/unix/include/isc/strerror.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+
+#ifndef ISC_STRERROR_H
+#define ISC_STRERROR_H
+
+/*! \file */
+
+#include <sys/types.h>
+
+#include <isc/lang.h>
+
+ISC_LANG_BEGINDECLS
+
+/*% String Error Size */
+#define ISC_STRERRORSIZE 128
+
+/*%
+ * Provide a thread safe wrapper to strerror().
+ *
+ * Requires:
+ * 	'buf' to be non NULL.
+ */
+void
+isc__strerror(int num, char *buf, size_t bufsize);
+
+ISC_LANG_ENDDECLS
+
+#endif /* ISC_STRERROR_H */
diff --git a/lib/isc/unix/include/isc/syslog.h b/lib/isc/unix/include/isc/syslog.h
new file mode 100644
index 0000000..e0b8e85
--- /dev/null
+++ b/lib/isc/unix/include/isc/syslog.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+
+#ifndef ISC_SYSLOG_H
+#define ISC_SYSLOG_H 1
+
+/*! \file */
+
+#include <isc/lang.h>
+#include <isc/types.h>
+
+ISC_LANG_BEGINDECLS
+
+isc_result_t
+isc_syslog_facilityfromstring(const char *str, int *facilityp);
+/*%<
+ * Convert 'str' to the appropriate syslog facility constant.
+ *
+ * Requires:
+ *
+ *\li	'str' is not NULL
+ *\li	'facilityp' is not NULL
+ *
+ * Returns:
+ * \li	#ISC_R_SUCCESS
+ * \li	#ISC_R_NOTFOUND
+ */
+
+ISC_LANG_ENDDECLS
+
+#endif /* ISC_SYSLOG_H */
diff --git a/lib/isc/unix/include/isc/time.h b/lib/isc/unix/include/isc/time.h
new file mode 100644
index 0000000..b864c29
--- /dev/null
+++ b/lib/isc/unix/include/isc/time.h
@@ -0,0 +1,361 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+
+#ifndef ISC_TIME_H
+#define ISC_TIME_H 1
+
+/*! \file */
+
+#include <inttypes.h>
+#include <stdbool.h>
+
+#include <isc/lang.h>
+#include <isc/types.h>
+
+/***
+ *** Intervals
+ ***/
+
+/*!
+ *  \brief
+ * The contents of this structure are private, and MUST NOT be accessed
+ * directly by callers.
+ *
+ * The contents are exposed only to allow callers to avoid dynamic allocation.
+ */
+struct isc_interval {
+	unsigned int seconds;
+	unsigned int nanoseconds;
+};
+
+extern const isc_interval_t * const isc_interval_zero;
+
+/*
+ * ISC_FORMATHTTPTIMESTAMP_SIZE needs to be 30 in C locale and potentially
+ * more for other locales to handle longer national abbreviations when
+ * expanding strftime's %a and %b.
+ */
+#define ISC_FORMATHTTPTIMESTAMP_SIZE 50
+
+ISC_LANG_BEGINDECLS
+
+void
+isc_interval_set(isc_interval_t *i,
+		 unsigned int seconds, unsigned int nanoseconds);
+/*%<
+ * Set 'i' to a value representing an interval of 'seconds' seconds and
+ * 'nanoseconds' nanoseconds, suitable for use in isc_time_add() and
+ * isc_time_subtract().
+ *
+ * Requires:
+ *
+ *\li	't' is a valid pointer.
+ *\li	nanoseconds < 1000000000.
+ */
+
+bool
+isc_interval_iszero(const isc_interval_t *i);
+/*%<
+ * Returns true iff. 'i' is the zero interval.
+ *
+ * Requires:
+ *
+ *\li	'i' is a valid pointer.
+ */
+
+/***
+ *** Absolute Times
+ ***/
+
+/*%
+ * The contents of this structure are private, and MUST NOT be accessed
+ * directly by callers.
+ *
+ * The contents are exposed only to allow callers to avoid dynamic allocation.
+ */
+
+struct isc_time {
+	unsigned int	seconds;
+	unsigned int	nanoseconds;
+};
+
+extern const isc_time_t * const isc_time_epoch;
+
+void
+isc_time_set(isc_time_t *t, unsigned int seconds, unsigned int nanoseconds);
+/*%<
+ * Set 't' to a value which represents the given number of seconds and
+ * nanoseconds since 00:00:00 January 1, 1970, UTC.
+ *
+ * Notes:
+ *\li	The Unix version of this call is equivalent to:
+ *\code
+ *	isc_time_settoepoch(t);
+ *	isc_interval_set(i, seconds, nanoseconds);
+ *	isc_time_add(t, i, t);
+ *\endcode
+ *
+ * Requires:
+ *\li	't' is a valid pointer.
+ *\li	nanoseconds < 1000000000.
+ */
+
+void
+isc_time_settoepoch(isc_time_t *t);
+/*%<
+ * Set 't' to the time of the epoch.
+ *
+ * Notes:
+ *\li	The date of the epoch is platform-dependent.
+ *
+ * Requires:
+ *
+ *\li	't' is a valid pointer.
+ */
+
+bool
+isc_time_isepoch(const isc_time_t *t);
+/*%<
+ * Returns true iff. 't' is the epoch ("time zero").
+ *
+ * Requires:
+ *
+ *\li	't' is a valid pointer.
+ */
+
+isc_result_t
+isc_time_now(isc_time_t *t);
+/*%<
+ * Set 't' to the current absolute time.
+ *
+ * Requires:
+ *
+ *\li	't' is a valid pointer.
+ *
+ * Returns:
+ *
+ *\li	Success
+ *\li	Unexpected error
+ *		Getting the time from the system failed.
+ *\li	Out of range
+ *		The time from the system is too large to be represented
+ *		in the current definition of isc_time_t.
+ */
+
+isc_result_t
+isc_time_nowplusinterval(isc_time_t *t, const isc_interval_t *i);
+/*%<
+ * Set *t to the current absolute time + i.
+ *
+ * Note:
+ *\li	This call is equivalent to:
+ *
+ *\code
+ *		isc_time_now(t);
+ *		isc_time_add(t, i, t);
+ *\endcode
+ *
+ * Requires:
+ *
+ *\li	't' and 'i' are valid pointers.
+ *
+ * Returns:
+ *
+ *\li	Success
+ *\li	Unexpected error
+ *		Getting the time from the system failed.
+ *\li	Out of range
+ *		The interval added to the time from the system is too large to
+ *		be represented in the current definition of isc_time_t.
+ */
+
+int
+isc_time_compare(const isc_time_t *t1, const isc_time_t *t2);
+/*%<
+ * Compare the times referenced by 't1' and 't2'
+ *
+ * Requires:
+ *
+ *\li	't1' and 't2' are valid pointers.
+ *
+ * Returns:
+ *
+ *\li	-1		t1 < t2		(comparing times, not pointers)
+ *\li	0		t1 = t2
+ *\li	1		t1 > t2
+ */
+
+isc_result_t
+isc_time_add(const isc_time_t *t, const isc_interval_t *i, isc_time_t *result);
+/*%<
+ * Add 'i' to 't', storing the result in 'result'.
+ *
+ * Requires:
+ *
+ *\li	't', 'i', and 'result' are valid pointers.
+ *
+ * Returns:
+ *\li	Success
+ *\li	Out of range
+ * 		The interval added to the time is too large to
+ *		be represented in the current definition of isc_time_t.
+ */
+
+isc_result_t
+isc_time_subtract(const isc_time_t *t, const isc_interval_t *i,
+		  isc_time_t *result);
+/*%<
+ * Subtract 'i' from 't', storing the result in 'result'.
+ *
+ * Requires:
+ *
+ *\li	't', 'i', and 'result' are valid pointers.
+ *
+ * Returns:
+ *\li	Success
+ *\li	Out of range
+ *		The interval is larger than the time since the epoch.
+ */
+
+uint64_t
+isc_time_microdiff(const isc_time_t *t1, const isc_time_t *t2);
+/*%<
+ * Find the difference in microseconds between time t1 and time t2.
+ * t2 is the subtrahend of t1; ie, difference = t1 - t2.
+ *
+ * Requires:
+ *
+ *\li	't1' and 't2' are valid pointers.
+ *
+ * Returns:
+ *\li	The difference of t1 - t2, or 0 if t1 <= t2.
+ */
+
+uint32_t
+isc_time_seconds(const isc_time_t *t);
+/*%<
+ * Return the number of seconds since the epoch stored in a time structure.
+ *
+ * Requires:
+ *
+ *\li	't' is a valid pointer.
+ */
+
+isc_result_t
+isc_time_secondsastimet(const isc_time_t *t, time_t *secondsp);
+/*%<
+ * Ensure the number of seconds in an isc_time_t is representable by a time_t.
+ *
+ * Notes:
+ *\li	The number of seconds stored in an isc_time_t might be larger
+ *	than the number of seconds a time_t is able to handle.  Since
+ *	time_t is mostly opaque according to the ANSI/ISO standard
+ *	(essentially, all you can be sure of is that it is an arithmetic type,
+ *	not even necessarily integral), it can be tricky to ensure that
+ *	the isc_time_t is in the range a time_t can handle.  Use this
+ *	function in place of isc_time_seconds() any time you need to set a
+ *	time_t from an isc_time_t.
+ *
+ * Requires:
+ *\li	't' is a valid pointer.
+ *
+ * Returns:
+ *\li	Success
+ *\li	Out of range
+ */
+
+uint32_t
+isc_time_nanoseconds(const isc_time_t *t);
+/*%<
+ * Return the number of nanoseconds stored in a time structure.
+ *
+ * Notes:
+ *\li	This is the number of nanoseconds in excess of the number
+ *	of seconds since the epoch; it will always be less than one
+ *	full second.
+ *
+ * Requires:
+ *\li	't' is a valid pointer.
+ *
+ * Ensures:
+ *\li	The returned value is less than 1*10^9.
+ */
+
+void
+isc_time_formattimestamp(const isc_time_t *t, char *buf, unsigned int len);
+/*%<
+ * Format the time 't' into the buffer 'buf' of length 'len',
+ * using a format like "30-Aug-2000 04:06:47.997" and the local time zone.
+ * If the text does not fit in the buffer, the result is indeterminate,
+ * but is always guaranteed to be null terminated.
+ *
+ *  Requires:
+ *\li      'len' > 0
+ *\li      'buf' points to an array of at least len chars
+ *
+ */
+
+void
+isc_time_formathttptimestamp(const isc_time_t *t, char *buf, unsigned int len);
+/*%<
+ * Format the time 't' into the buffer 'buf' of length 'len',
+ * using a format like "Mon, 30 Aug 2000 04:06:47 GMT"
+ * If the text does not fit in the buffer, the result is indeterminate,
+ * but is always guaranteed to be null terminated.
+ *
+ *  Requires:
+ *\li      'len' > 0
+ *\li      'buf' points to an array of at least len chars
+ *
+ */
+
+isc_result_t
+isc_time_parsehttptimestamp(char *input, isc_time_t *t);
+/*%<
+ * Parse the time in 'input' into the isc_time_t pointed to by 't',
+ * expecting a format like "Mon, 30 Aug 2000 04:06:47 GMT"
+ *
+ *  Requires:
+ *\li      'buf' and 't' are not NULL.
+ */
+
+void
+isc_time_formatISO8601(const isc_time_t *t, char *buf, unsigned int len);
+/*%<
+ * Format the time 't' into the buffer 'buf' of length 'len',
+ * using the ISO8601 format: "yyyy-mm-ddThh:mm:ssZ"
+ * If the text does not fit in the buffer, the result is indeterminate,
+ * but is always guaranteed to be null terminated.
+ *
+ *  Requires:
+ *\li      'len' > 0
+ *\li      'buf' points to an array of at least len chars
+ *
+ */
+
+void
+isc_time_formatISO8601ms(const isc_time_t *t, char *buf, unsigned int len);
+/*%<
+ * Format the time 't' into the buffer 'buf' of length 'len',
+ * using the ISO8601 format: "yyyy-mm-ddThh:mm:ss.sssZ"
+ * If the text does not fit in the buffer, the result is indeterminate,
+ * but is always guaranteed to be null terminated.
+ *
+ *  Requires:
+ *\li      'len' > 0
+ *\li      'buf' points to an array of at least len chars
+ *
+ */
+
+ISC_LANG_ENDDECLS
+
+#endif /* ISC_TIME_H */
diff --git a/lib/isc/unix/include/pkcs11/Makefile.in b/lib/isc/unix/include/pkcs11/Makefile.in
new file mode 100644
index 0000000..420fec1
--- /dev/null
+++ b/lib/isc/unix/include/pkcs11/Makefile.in
@@ -0,0 +1,31 @@
+# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+#
+# See the COPYRIGHT file distributed with this work for additional
+# information regarding copyright ownership.
+
+srcdir =	@srcdir@
+VPATH =		@srcdir@
+top_srcdir =	@top_srcdir@
+
+HEADERS =	cryptoki.h
+SUBDIRS =
+TARGETS =
+
+@BIND9_MAKE_RULES@
+
+installdirs:
+	$(SHELL) ${top_srcdir}/mkinstalldirs ${DESTDIR}${includedir}/pkcs11
+
+install:: installdirs
+	for i in ${HEADERS}; do \
+		${INSTALL_DATA} $(srcdir)/$$i ${DESTDIR}${includedir}/pkcs11 || exit 1; \
+	done
+
+uninstall::
+	for i in ${HEADERS}; do \
+		rm -f ${DESTDIR}${includedir}/pkcs11/$$i || exit 1; \
+	done
diff --git a/lib/isc/unix/include/pkcs11/cryptoki.h b/lib/isc/unix/include/pkcs11/cryptoki.h
new file mode 100644
index 0000000..7dc48b0
--- /dev/null
+++ b/lib/isc/unix/include/pkcs11/cryptoki.h
@@ -0,0 +1,66 @@
+/* cryptoki.h include file for PKCS #11. */
+/*
+ * Copyright (C) 2009  Internet Systems Consortium, Inc. ("ISC")
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND ISC AND NETWORK ASSOCIATES DISCLAIMS
+ * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE
+ * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
+ * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+/* $Revision: 1.3 $ */
+
+/*
+ * Portions Copyright RSA Security Inc.
+ *
+ * License to copy and use this software is granted provided that it is
+ * identified as "RSA Security Inc. PKCS #11 Cryptographic Token Interface
+ * (Cryptoki)" in all material mentioning or referencing this software.
+
+ * License is also granted to make and use derivative works provided that
+ * such works are identified as "derived from the RSA Security Inc. PKCS #11
+ * Cryptographic Token Interface (Cryptoki)" in all material mentioning or 
+ * referencing the derived work.
+
+ * RSA Security Inc. makes no representations concerning either the 
+ * merchantability of this software or the suitability of this software for
+ * any particular purpose. It is provided "as is" without express or implied
+ * warranty of any kind.
+ */
+
+/* This is a sample file containing the top level include directives
+ * for building Unix Cryptoki libraries and applications.
+ */
+
+#ifndef ___CRYPTOKI_H_INC___
+#define ___CRYPTOKI_H_INC___
+
+#define CK_PTR *
+
+#define CK_DEFINE_FUNCTION(returnType, name) \
+  returnType name
+
+#define CK_DECLARE_FUNCTION(returnType, name) \
+  returnType name
+
+#define CK_DECLARE_FUNCTION_POINTER(returnType, name) \
+  returnType (* name)
+
+#define CK_CALLBACK_FUNCTION(returnType, name) \
+  returnType (* name)
+
+/* NULL is in unistd.h */
+#include <unistd.h>
+#define NULL_PTR NULL
+
+#undef CK_PKCS11_FUNCTION_INFO
+
+#include <pkcs11/pkcs11.h>
+
+#endif /* ___CRYPTOKI_H_INC___ */
diff --git a/lib/isc/unix/interfaceiter.c b/lib/isc/unix/interfaceiter.c
new file mode 100644
index 0000000..4df4d34
--- /dev/null
+++ b/lib/isc/unix/interfaceiter.c
@@ -0,0 +1,306 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+
+/*! \file */
+
+#include <config.h>
+
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#ifdef HAVE_SYS_SOCKIO_H
+#include <sys/sockio.h>		/* Required for ifiter_ioctl.c. */
+#endif
+
+#include <stdio.h>
+#include <inttypes.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include <isc/interfaceiter.h>
+#include <isc/log.h>
+#include <isc/magic.h>
+#include <isc/mem.h>
+#include <isc/msgs.h>
+#include <isc/net.h>
+#include <isc/print.h>
+#include <isc/result.h>
+#include <isc/strerror.h>
+#include <isc/string.h>
+#include <isc/types.h>
+#include <isc/util.h>
+
+/* Must follow <isc/net.h>. */
+#ifdef HAVE_NET_IF6_H
+#include <net/if6.h>
+#endif
+#include <net/if.h>
+
+/* Common utility functions */
+
+/*%
+ * Extract the network address part from a "struct sockaddr".
+ * \brief
+ * The address family is given explicitly
+ * instead of using src->sa_family, because the latter does not work
+ * for copying a network mask obtained by SIOCGIFNETMASK (it does
+ * not have a valid address family).
+ */
+
+static void
+get_addr(unsigned int family, isc_netaddr_t *dst, struct sockaddr *src,
+	 char *ifname)
+{
+	struct sockaddr_in6 *sa6;
+
+#if !defined(ISC_PLATFORM_HAVEIFNAMETOINDEX) || \
+    !defined(ISC_PLATFORM_HAVESCOPEID)
+	UNUSED(ifname);
+#endif
+
+	/* clear any remaining value for safety */
+	memset(dst, 0, sizeof(*dst));
+
+	dst->family = family;
+	switch (family) {
+	case AF_INET:
+		memmove(&dst->type.in,
+			&((struct sockaddr_in *) src)->sin_addr,
+			sizeof(struct in_addr));
+		break;
+	case AF_INET6:
+		sa6 = (struct sockaddr_in6 *)src;
+		memmove(&dst->type.in6, &sa6->sin6_addr,
+			sizeof(struct in6_addr));
+#ifdef ISC_PLATFORM_HAVESCOPEID
+		if (sa6->sin6_scope_id != 0)
+			isc_netaddr_setzone(dst, sa6->sin6_scope_id);
+		else {
+			/*
+			 * BSD variants embed scope zone IDs in the 128bit
+			 * address as a kernel internal form.  Unfortunately,
+			 * the embedded IDs are not hidden from applications
+			 * when getting access to them by sysctl or ioctl.
+			 * We convert the internal format to the pure address
+			 * part and the zone ID part.
+			 * Since multicast addresses should not appear here
+			 * and they cannot be distinguished from netmasks,
+			 * we only consider unicast link-local addresses.
+			 */
+			if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) {
+				uint16_t zone16;
+
+				memmove(&zone16, &sa6->sin6_addr.s6_addr[2],
+					sizeof(zone16));
+				zone16 = ntohs(zone16);
+				if (zone16 != 0) {
+					/* the zone ID is embedded */
+					isc_netaddr_setzone(dst,
+							    (uint32_t)zone16);
+					dst->type.in6.s6_addr[2] = 0;
+					dst->type.in6.s6_addr[3] = 0;
+#ifdef ISC_PLATFORM_HAVEIFNAMETOINDEX
+				} else if (ifname != NULL) {
+					unsigned int zone;
+
+					/*
+					 * sin6_scope_id is still not provided,
+					 * but the corresponding interface name
+					 * is know.  Use the interface ID as
+					 * the link ID.
+					 */
+					zone = if_nametoindex(ifname);
+					if (zone != 0) {
+						isc_netaddr_setzone(dst,
+								    (uint32_t)zone);
+					}
+#endif
+				}
+			}
+		}
+#endif
+		break;
+	default:
+		INSIST(0);
+		break;
+	}
+}
+
+/*
+ * Include system-dependent code.
+ */
+
+#ifdef __linux
+#define ISC_IF_INET6_SZ \
+    sizeof("00000000000000000000000000000001 01 80 10 80 XXXXXXloXXXXXXXX\n")
+static isc_result_t linux_if_inet6_next(isc_interfaceiter_t *);
+static isc_result_t linux_if_inet6_current(isc_interfaceiter_t *);
+static void linux_if_inet6_first(isc_interfaceiter_t *iter);
+#endif
+
+#if HAVE_GETIFADDRS
+#include "ifiter_getifaddrs.c"
+#elif HAVE_IFLIST_SYSCTL
+#include "ifiter_sysctl.c"
+#else
+#include "ifiter_ioctl.c"
+#endif
+
+#ifdef __linux
+static void
+linux_if_inet6_first(isc_interfaceiter_t *iter) {
+	if (iter->proc != NULL) {
+		rewind(iter->proc);
+		(void)linux_if_inet6_next(iter);
+	} else
+		iter->valid = ISC_R_NOMORE;
+}
+
+static isc_result_t
+linux_if_inet6_next(isc_interfaceiter_t *iter) {
+	if (iter->proc != NULL &&
+	    fgets(iter->entry, sizeof(iter->entry), iter->proc) != NULL)
+		iter->valid = ISC_R_SUCCESS;
+	else
+		iter->valid = ISC_R_NOMORE;
+	return (iter->valid);
+}
+
+static isc_result_t
+linux_if_inet6_current(isc_interfaceiter_t *iter) {
+	char address[33];
+	char name[IF_NAMESIZE+1];
+	struct in6_addr addr6;
+	unsigned int ifindex, prefix, flag3, flag4;
+	int res;
+	unsigned int i;
+
+	if (iter->valid != ISC_R_SUCCESS)
+		return (iter->valid);
+	if (iter->proc == NULL) {
+		isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+			      ISC_LOGMODULE_INTERFACE, ISC_LOG_ERROR,
+			      "/proc/net/if_inet6:iter->proc == NULL");
+		return (ISC_R_FAILURE);
+	}
+
+	res = sscanf(iter->entry, "%32[a-f0-9] %x %x %x %x %16s\n",
+		     address, &ifindex, &prefix, &flag3, &flag4, name);
+	if (res != 6) {
+		isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+			      ISC_LOGMODULE_INTERFACE, ISC_LOG_ERROR,
+			      "/proc/net/if_inet6:sscanf() -> %d (expected 6)",
+			      res);
+		return (ISC_R_FAILURE);
+	}
+	if (strlen(address) != 32) {
+		isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+			      ISC_LOGMODULE_INTERFACE, ISC_LOG_ERROR,
+			      "/proc/net/if_inet6:strlen(%s) != 32", address);
+		return (ISC_R_FAILURE);
+	}
+	for (i = 0; i < 16; i++) {
+		unsigned char byte;
+		static const char hex[] = "0123456789abcdef";
+		byte = ((strchr(hex, address[i * 2]) - hex) << 4) |
+		       (strchr(hex, address[i * 2 + 1]) - hex);
+		addr6.s6_addr[i] = byte;
+	}
+	iter->current.af = AF_INET6;
+	iter->current.flags = INTERFACE_F_UP;
+	isc_netaddr_fromin6(&iter->current.address, &addr6);
+	if (isc_netaddr_islinklocal(&iter->current.address)) {
+		isc_netaddr_setzone(&iter->current.address,
+				    (uint32_t)ifindex);
+	}
+	for (i = 0; i < 16; i++) {
+		if (prefix > 8) {
+			addr6.s6_addr[i] = 0xff;
+			prefix -= 8;
+		} else {
+			addr6.s6_addr[i] = (0xff << (8 - prefix)) & 0xff;
+			prefix = 0;
+		}
+	}
+	isc_netaddr_fromin6(&iter->current.netmask, &addr6);
+	strlcpy(iter->current.name, name, sizeof(iter->current.name));
+	return (ISC_R_SUCCESS);
+}
+#endif
+
+/*
+ * The remaining code is common to the sysctl and ioctl case.
+ */
+
+isc_result_t
+isc_interfaceiter_current(isc_interfaceiter_t *iter,
+			  isc_interface_t *ifdata)
+{
+	REQUIRE(iter->result == ISC_R_SUCCESS);
+	memmove(ifdata, &iter->current, sizeof(*ifdata));
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc_interfaceiter_first(isc_interfaceiter_t *iter) {
+	isc_result_t result;
+
+	REQUIRE(VALID_IFITER(iter));
+
+	internal_first(iter);
+	for (;;) {
+		result = internal_current(iter);
+		if (result != ISC_R_IGNORE)
+			break;
+		result = internal_next(iter);
+		if (result != ISC_R_SUCCESS)
+			break;
+	}
+	iter->result = result;
+	return (result);
+}
+
+isc_result_t
+isc_interfaceiter_next(isc_interfaceiter_t *iter) {
+	isc_result_t result;
+
+	REQUIRE(VALID_IFITER(iter));
+	REQUIRE(iter->result == ISC_R_SUCCESS);
+
+	for (;;) {
+		result = internal_next(iter);
+		if (result != ISC_R_SUCCESS)
+			break;
+		result = internal_current(iter);
+		if (result != ISC_R_IGNORE)
+			break;
+	}
+	iter->result = result;
+	return (result);
+}
+
+void
+isc_interfaceiter_destroy(isc_interfaceiter_t **iterp)
+{
+	isc_interfaceiter_t *iter;
+	REQUIRE(iterp != NULL);
+	iter = *iterp;
+	REQUIRE(VALID_IFITER(iter));
+
+	internal_destroy(iter);
+	if (iter->buf != NULL)
+		isc_mem_put(iter->mctx, iter->buf, iter->bufsize);
+
+	iter->magic = 0;
+	isc_mem_put(iter->mctx, iter, sizeof(*iter));
+	*iterp = NULL;
+}
diff --git a/lib/isc/unix/ipv6.c b/lib/isc/unix/ipv6.c
new file mode 100644
index 0000000..eb77377
--- /dev/null
+++ b/lib/isc/unix/ipv6.c
@@ -0,0 +1,20 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+
+/*! \file */
+
+#include <config.h>
+
+#include <isc/ipv6.h>
+
+const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
+const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
diff --git a/lib/isc/unix/keyboard.c b/lib/isc/unix/keyboard.c
new file mode 100644
index 0000000..cb5f116
--- /dev/null
+++ b/lib/isc/unix/keyboard.c
@@ -0,0 +1,121 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+
+#include <config.h>
+
+#include <stdbool.h>
+
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/uio.h>
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <termios.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+#include <isc/keyboard.h>
+#include <isc/util.h>
+
+isc_result_t
+isc_keyboard_open(isc_keyboard_t *keyboard) {
+	int fd;
+	isc_result_t ret;
+	struct termios current_mode;
+
+	REQUIRE(keyboard != NULL);
+
+	fd = open("/dev/tty", O_RDONLY, 0);
+	if (fd < 0)
+		return (ISC_R_IOERROR);
+
+	keyboard->fd = fd;
+
+	if (tcgetattr(fd, &keyboard->saved_mode) < 0) {
+		ret = ISC_R_IOERROR;
+		goto errout;
+	}
+
+	current_mode = keyboard->saved_mode;
+
+	current_mode.c_iflag &=
+			~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
+	current_mode.c_oflag &= ~OPOST;
+	current_mode.c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
+	current_mode.c_cflag &= ~(CSIZE|PARENB);
+	current_mode.c_cflag |= CS8;
+
+	current_mode.c_cc[VMIN] = 1;
+	current_mode.c_cc[VTIME] = 0;
+	if (tcsetattr(fd, TCSAFLUSH, &current_mode) < 0) {
+		ret = ISC_R_IOERROR;
+		goto errout;
+	}
+
+	keyboard->result = ISC_R_SUCCESS;
+
+	return (ISC_R_SUCCESS);
+
+ errout:
+	close (fd);
+
+	return (ret);
+}
+
+isc_result_t
+isc_keyboard_close(isc_keyboard_t *keyboard, unsigned int sleeptime) {
+	REQUIRE(keyboard != NULL);
+
+	if (sleeptime > 0 && keyboard->result != ISC_R_CANCELED)
+		(void)sleep(sleeptime);
+
+	(void)tcsetattr(keyboard->fd, TCSAFLUSH, &keyboard->saved_mode);
+	(void)close(keyboard->fd);
+
+	keyboard->fd = -1;
+
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc_keyboard_getchar(isc_keyboard_t *keyboard, unsigned char *cp) {
+	ssize_t cc;
+	unsigned char c;
+	cc_t *controlchars;
+
+	REQUIRE(keyboard != NULL);
+	REQUIRE(cp != NULL);
+
+	cc = read(keyboard->fd, &c, 1);
+	if (cc < 0) {
+		keyboard->result = ISC_R_IOERROR;
+		return (keyboard->result);
+	}
+
+	controlchars = keyboard->saved_mode.c_cc;
+	if (c == controlchars[VINTR] || c == controlchars[VQUIT]) {
+		keyboard->result = ISC_R_CANCELED;
+		return (keyboard->result);
+	}
+
+	*cp = c;
+
+	return (ISC_R_SUCCESS);
+}
+
+bool
+isc_keyboard_canceled(isc_keyboard_t *keyboard) {
+	return (keyboard->result == ISC_R_CANCELED);
+}
diff --git a/lib/isc/unix/meminfo.c b/lib/isc/unix/meminfo.c
new file mode 100644
index 0000000..ad750a7
--- /dev/null
+++ b/lib/isc/unix/meminfo.c
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+#include <config.h>
+
+#include <isc/meminfo.h>
+#include <inttypes.h>
+#include <unistd.h>
+#ifdef HAVE_SYS_SYSCTL_H
+#include <sys/sysctl.h>
+#endif
+
+uint64_t
+isc_meminfo_totalphys(void) {
+#if defined(CTL_HW) && (defined(HW_PHYSMEM64) || defined(HW_MEMSIZE))
+	int mib[2];
+	mib[0] = CTL_HW;
+#if defined(HW_MEMSIZE)
+	mib[1] = HW_MEMSIZE;
+#elif defined(HW_PHYSMEM64)
+	mib[1] = HW_PHYSMEM64;
+#endif
+	uint64_t size = 0;
+	size_t len = sizeof(size);
+	if (sysctl(mib, 2, &size, &len, NULL, 0) == 0)
+		return (size);
+#endif
+#if defined(_SC_PHYS_PAGES) && defined(_SC_PAGESIZE)
+	return ((size_t) (sysconf(_SC_PHYS_PAGES) * sysconf(_SC_PAGESIZE)));
+#endif
+	return (0);
+}
diff --git a/lib/isc/unix/net.c b/lib/isc/unix/net.c
new file mode 100644
index 0000000..efe17bd
--- /dev/null
+++ b/lib/isc/unix/net.c
@@ -0,0 +1,913 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+
+#include <config.h>
+
+#include <sys/types.h>
+
+#if defined(HAVE_SYS_SYSCTL_H)
+#if defined(HAVE_SYS_PARAM_H)
+#include <sys/param.h>
+#endif
+#include <sys/sysctl.h>
+#endif
+#include <sys/uio.h>
+
+#include <errno.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+#include <isc/log.h>
+#include <isc/msgs.h>
+#include <isc/net.h>
+#include <isc/netdb.h>
+#include <isc/once.h>
+#include <isc/strerror.h>
+#include <isc/string.h>
+#include <isc/util.h>
+
+#ifndef ISC_SOCKADDR_LEN_T
+#define ISC_SOCKADDR_LEN_T unsigned int
+#endif
+
+/*%
+ * Definitions about UDP port range specification.  This is a total mess of
+ * portability variants: some use sysctl (but the sysctl names vary), some use
+ * system-specific interfaces, some have the same interface for IPv4 and IPv6,
+ * some separate them, etc...
+ */
+
+/*%
+ * The last resort defaults: use all non well known port space
+ */
+#ifndef ISC_NET_PORTRANGELOW
+#define ISC_NET_PORTRANGELOW 1024
+#endif	/* ISC_NET_PORTRANGELOW */
+#ifndef ISC_NET_PORTRANGEHIGH
+#define ISC_NET_PORTRANGEHIGH 65535
+#endif	/* ISC_NET_PORTRANGEHIGH */
+
+#ifdef HAVE_SYSCTLBYNAME
+
+/*%
+ * sysctl variants
+ */
+#if defined(__FreeBSD__) || defined(__APPLE__) || defined(__DragonFly__)
+#define USE_SYSCTL_PORTRANGE
+#define SYSCTL_V4PORTRANGE_LOW	"net.inet.ip.portrange.hifirst"
+#define SYSCTL_V4PORTRANGE_HIGH	"net.inet.ip.portrange.hilast"
+#define SYSCTL_V6PORTRANGE_LOW	"net.inet.ip.portrange.hifirst"
+#define SYSCTL_V6PORTRANGE_HIGH	"net.inet.ip.portrange.hilast"
+#endif
+
+#ifdef __NetBSD__
+#define USE_SYSCTL_PORTRANGE
+#define SYSCTL_V4PORTRANGE_LOW	"net.inet.ip.anonportmin"
+#define SYSCTL_V4PORTRANGE_HIGH	"net.inet.ip.anonportmax"
+#define SYSCTL_V6PORTRANGE_LOW	"net.inet6.ip6.anonportmin"
+#define SYSCTL_V6PORTRANGE_HIGH	"net.inet6.ip6.anonportmax"
+#endif
+
+#else /* !HAVE_SYSCTLBYNAME */
+
+#ifdef __OpenBSD__
+#define USE_SYSCTL_PORTRANGE
+#define SYSCTL_V4PORTRANGE_LOW	{ CTL_NET, PF_INET, IPPROTO_IP, \
+				  IPCTL_IPPORT_HIFIRSTAUTO }
+#define SYSCTL_V4PORTRANGE_HIGH	{ CTL_NET, PF_INET, IPPROTO_IP, \
+				  IPCTL_IPPORT_HILASTAUTO }
+/* Same for IPv6 */
+#define SYSCTL_V6PORTRANGE_LOW	SYSCTL_V4PORTRANGE_LOW
+#define SYSCTL_V6PORTRANGE_HIGH	SYSCTL_V4PORTRANGE_HIGH
+#endif
+
+#endif /* HAVE_SYSCTLBYNAME */
+
+#if defined(ISC_PLATFORM_HAVEIPV6)
+# if defined(ISC_PLATFORM_NEEDIN6ADDRANY)
+const struct in6_addr isc_net_in6addrany = IN6ADDR_ANY_INIT;
+# endif
+
+# if defined(ISC_PLATFORM_NEEDIN6ADDRLOOPBACK)
+const struct in6_addr isc_net_in6addrloop = IN6ADDR_LOOPBACK_INIT;
+# endif
+
+# if defined(WANT_IPV6)
+static isc_once_t 	once_ipv6only = ISC_ONCE_INIT;
+
+#  if defined(ISC_PLATFORM_HAVEIN6PKTINFO)
+static isc_once_t 	once_ipv6pktinfo = ISC_ONCE_INIT;
+#  endif
+# endif /* WANT_IPV6 */
+#endif /* ISC_PLATFORM_HAVEIPV6 */
+
+#ifndef ISC_CMSG_IP_TOS
+#ifdef __APPLE__
+#define ISC_CMSG_IP_TOS 0	/* As of 10.8.2. */
+#else /* ! __APPLE__ */
+#define ISC_CMSG_IP_TOS 1
+#endif /* ! __APPLE__ */
+#endif /* ! ISC_CMSG_IP_TOS */
+
+static isc_once_t 	once = ISC_ONCE_INIT;
+static isc_once_t 	once_dscp = ISC_ONCE_INIT;
+
+static isc_result_t	ipv4_result = ISC_R_NOTFOUND;
+static isc_result_t	ipv6_result = ISC_R_NOTFOUND;
+static isc_result_t	unix_result = ISC_R_NOTFOUND;
+static isc_result_t	ipv6only_result = ISC_R_NOTFOUND;
+static isc_result_t	ipv6pktinfo_result = ISC_R_NOTFOUND;
+static unsigned int	dscp_result = 0;
+
+static isc_result_t
+try_proto(int domain) {
+	int s;
+	isc_result_t result = ISC_R_SUCCESS;
+	char strbuf[ISC_STRERRORSIZE];
+
+	s = socket(domain, SOCK_STREAM, 0);
+	if (s == -1) {
+		switch (errno) {
+#ifdef EAFNOSUPPORT
+		case EAFNOSUPPORT:
+#endif
+#ifdef EPFNOSUPPORT
+		case EPFNOSUPPORT:
+#endif
+#ifdef EPROTONOSUPPORT
+		case EPROTONOSUPPORT:
+#endif
+#ifdef EINVAL
+		case EINVAL:
+#endif
+			return (ISC_R_NOTFOUND);
+		default:
+			isc__strerror(errno, strbuf, sizeof(strbuf));
+			UNEXPECTED_ERROR(__FILE__, __LINE__,
+					 "socket() %s: %s",
+					 isc_msgcat_get(isc_msgcat,
+							ISC_MSGSET_GENERAL,
+							ISC_MSG_FAILED,
+							"failed"),
+					 strbuf);
+			return (ISC_R_UNEXPECTED);
+		}
+	}
+
+#ifdef ISC_PLATFORM_HAVEIPV6
+#ifdef WANT_IPV6
+#ifdef ISC_PLATFORM_HAVEIN6PKTINFO
+	if (domain == PF_INET6) {
+		struct sockaddr_in6 sin6;
+		unsigned int len;
+
+		/*
+		 * Check to see if IPv6 is broken, as is common on Linux.
+		 */
+		len = sizeof(sin6);
+		if (getsockname(s, (struct sockaddr *)&sin6, (void *)&len) < 0)
+		{
+			isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+				      ISC_LOGMODULE_SOCKET, ISC_LOG_ERROR,
+				      "retrieving the address of an IPv6 "
+				      "socket from the kernel failed.");
+			isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+				      ISC_LOGMODULE_SOCKET, ISC_LOG_ERROR,
+				      "IPv6 is not supported.");
+			result = ISC_R_NOTFOUND;
+		} else {
+			if (len == sizeof(struct sockaddr_in6))
+				result = ISC_R_SUCCESS;
+			else {
+				isc_log_write(isc_lctx,
+					      ISC_LOGCATEGORY_GENERAL,
+					      ISC_LOGMODULE_SOCKET,
+					      ISC_LOG_ERROR,
+					      "IPv6 structures in kernel and "
+					      "user space do not match.");
+				isc_log_write(isc_lctx,
+					      ISC_LOGCATEGORY_GENERAL,
+					      ISC_LOGMODULE_SOCKET,
+					      ISC_LOG_ERROR,
+					      "IPv6 is not supported.");
+				result = ISC_R_NOTFOUND;
+			}
+		}
+	}
+#endif
+#endif
+#endif
+
+	(void)close(s);
+
+	return (result);
+}
+
+static void
+initialize_action(void) {
+	ipv4_result = try_proto(PF_INET);
+#ifdef ISC_PLATFORM_HAVEIPV6
+#ifdef WANT_IPV6
+#ifdef ISC_PLATFORM_HAVEIN6PKTINFO
+	ipv6_result = try_proto(PF_INET6);
+#endif
+#endif
+#endif
+#ifdef ISC_PLATFORM_HAVESYSUNH
+	unix_result = try_proto(PF_UNIX);
+#endif
+}
+
+static void
+initialize(void) {
+	RUNTIME_CHECK(isc_once_do(&once, initialize_action) == ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc_net_probeipv4(void) {
+	initialize();
+	return (ipv4_result);
+}
+
+isc_result_t
+isc_net_probeipv6(void) {
+	initialize();
+	return (ipv6_result);
+}
+
+isc_result_t
+isc_net_probeunix(void) {
+	initialize();
+	return (unix_result);
+}
+
+#ifdef ISC_PLATFORM_HAVEIPV6
+#ifdef WANT_IPV6
+static void
+try_ipv6only(void) {
+#ifdef IPV6_V6ONLY
+	int s, on;
+	char strbuf[ISC_STRERRORSIZE];
+#endif
+	isc_result_t result;
+
+	result = isc_net_probeipv6();
+	if (result != ISC_R_SUCCESS) {
+		ipv6only_result = result;
+		return;
+	}
+
+#ifndef IPV6_V6ONLY
+	ipv6only_result = ISC_R_NOTFOUND;
+	return;
+#else
+	/* check for TCP sockets */
+	s = socket(PF_INET6, SOCK_STREAM, 0);
+	if (s == -1) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 "socket() %s: %s",
+				 isc_msgcat_get(isc_msgcat,
+						ISC_MSGSET_GENERAL,
+						ISC_MSG_FAILED,
+						"failed"),
+				 strbuf);
+		ipv6only_result = ISC_R_UNEXPECTED;
+		return;
+	}
+
+	on = 1;
+	if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) {
+		ipv6only_result = ISC_R_NOTFOUND;
+		goto close;
+	}
+
+	close(s);
+
+	/* check for UDP sockets */
+	s = socket(PF_INET6, SOCK_DGRAM, 0);
+	if (s == -1) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 "socket() %s: %s",
+				 isc_msgcat_get(isc_msgcat,
+						ISC_MSGSET_GENERAL,
+						ISC_MSG_FAILED,
+						"failed"),
+				 strbuf);
+		ipv6only_result = ISC_R_UNEXPECTED;
+		return;
+	}
+
+	on = 1;
+	if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) {
+		ipv6only_result = ISC_R_NOTFOUND;
+		goto close;
+	}
+
+	ipv6only_result = ISC_R_SUCCESS;
+
+close:
+	close(s);
+	return;
+#endif /* IPV6_V6ONLY */
+}
+
+static void
+initialize_ipv6only(void) {
+	RUNTIME_CHECK(isc_once_do(&once_ipv6only,
+				  try_ipv6only) == ISC_R_SUCCESS);
+}
+#endif /* WANT_IPV6 */
+
+#ifdef ISC_PLATFORM_HAVEIN6PKTINFO
+#ifdef WANT_IPV6
+static void
+try_ipv6pktinfo(void) {
+	int s, on;
+	char strbuf[ISC_STRERRORSIZE];
+	isc_result_t result;
+	int optname;
+
+	result = isc_net_probeipv6();
+	if (result != ISC_R_SUCCESS) {
+		ipv6pktinfo_result = result;
+		return;
+	}
+
+	/* we only use this for UDP sockets */
+	s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
+	if (s == -1) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 "socket() %s: %s",
+				 isc_msgcat_get(isc_msgcat,
+						ISC_MSGSET_GENERAL,
+						ISC_MSG_FAILED,
+						"failed"),
+				 strbuf);
+		ipv6pktinfo_result = ISC_R_UNEXPECTED;
+		return;
+	}
+
+#ifdef IPV6_RECVPKTINFO
+	optname = IPV6_RECVPKTINFO;
+#else
+	optname = IPV6_PKTINFO;
+#endif
+	on = 1;
+	if (setsockopt(s, IPPROTO_IPV6, optname, &on, sizeof(on)) < 0) {
+		ipv6pktinfo_result = ISC_R_NOTFOUND;
+		goto close;
+	}
+
+	ipv6pktinfo_result = ISC_R_SUCCESS;
+
+close:
+	close(s);
+	return;
+}
+
+static void
+initialize_ipv6pktinfo(void) {
+	RUNTIME_CHECK(isc_once_do(&once_ipv6pktinfo,
+				  try_ipv6pktinfo) == ISC_R_SUCCESS);
+}
+#endif /* WANT_IPV6 */
+#endif /* ISC_PLATFORM_HAVEIN6PKTINFO */
+#endif /* ISC_PLATFORM_HAVEIPV6 */
+
+isc_result_t
+isc_net_probe_ipv6only(void) {
+#ifdef ISC_PLATFORM_HAVEIPV6
+#ifdef WANT_IPV6
+	initialize_ipv6only();
+#else
+	ipv6only_result = ISC_R_NOTFOUND;
+#endif
+#endif
+	return (ipv6only_result);
+}
+
+isc_result_t
+isc_net_probe_ipv6pktinfo(void) {
+#ifdef ISC_PLATFORM_HAVEIPV6
+#ifdef ISC_PLATFORM_HAVEIN6PKTINFO
+#ifdef WANT_IPV6
+	initialize_ipv6pktinfo();
+#else
+	ipv6pktinfo_result = ISC_R_NOTFOUND;
+#endif
+#endif
+#endif
+	return (ipv6pktinfo_result);
+}
+
+#if ISC_CMSG_IP_TOS || \
+    defined(ISC_NET_BSD44MSGHDR) && defined(IPV6_TCLASS) && defined(WANT_IPV6)
+
+static inline ISC_SOCKADDR_LEN_T
+cmsg_len(ISC_SOCKADDR_LEN_T len) {
+#ifdef CMSG_LEN
+	return (CMSG_LEN(len));
+#else
+	ISC_SOCKADDR_LEN_T hdrlen;
+
+	/*
+	 * Cast NULL so that any pointer arithmetic performed by CMSG_DATA
+	 * is correct.
+	 */
+	hdrlen = (ISC_SOCKADDR_LEN_T)CMSG_DATA(((struct cmsghdr *)NULL));
+	return (hdrlen + len);
+#endif
+}
+
+static inline ISC_SOCKADDR_LEN_T
+cmsg_space(ISC_SOCKADDR_LEN_T len) {
+#ifdef CMSG_SPACE
+	return (CMSG_SPACE(len));
+#else
+	struct msghdr msg;
+	struct cmsghdr *cmsgp;
+	/*
+	 * XXX: The buffer length is an ad-hoc value, but should be enough
+	 * in a practical sense.
+	 */
+	char dummybuf[sizeof(struct cmsghdr) + 1024];
+
+	memset(&msg, 0, sizeof(msg));
+	msg.msg_control = dummybuf;
+	msg.msg_controllen = sizeof(dummybuf);
+
+	cmsgp = (struct cmsghdr *)dummybuf;
+	cmsgp->cmsg_len = cmsg_len(len);
+
+	cmsgp = CMSG_NXTHDR(&msg, cmsgp);
+	if (cmsgp != NULL)
+		return ((char *)cmsgp - (char *)msg.msg_control);
+	else
+		return (0);
+#endif
+}
+
+#ifdef ISC_NET_BSD44MSGHDR
+/*
+ * Make a fd non-blocking.
+ */
+static isc_result_t
+make_nonblock(int fd) {
+	int ret;
+	int flags;
+	char strbuf[ISC_STRERRORSIZE];
+#ifdef USE_FIONBIO_IOCTL
+	int on = 1;
+
+	ret = ioctl(fd, FIONBIO, (char *)&on);
+#else
+	flags = fcntl(fd, F_GETFL, 0);
+	flags |= PORT_NONBLOCK;
+	ret = fcntl(fd, F_SETFL, flags);
+#endif
+
+	if (ret == -1) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+#ifdef USE_FIONBIO_IOCTL
+				 "ioctl(%d, FIONBIO, &on): %s", fd,
+#else
+				 "fcntl(%d, F_SETFL, %d): %s", fd, flags,
+#endif
+				 strbuf);
+
+		return (ISC_R_UNEXPECTED);
+	}
+
+	return (ISC_R_SUCCESS);
+}
+
+static bool
+cmsgsend(int s, int level, int type, struct addrinfo *res) {
+	char strbuf[ISC_STRERRORSIZE];
+	struct sockaddr_storage ss;
+	ISC_SOCKADDR_LEN_T len = sizeof(ss);
+	struct msghdr msg;
+	union {
+		struct cmsghdr h;
+		unsigned char b[256];
+	} control;
+	struct cmsghdr *cmsgp;
+	int dscp = (46 << 2);	/* Expedited forwarding. */
+	struct iovec iovec;
+	char buf[1] = { 0 };
+	isc_result_t result;
+
+	if (bind(s, res->ai_addr, res->ai_addrlen) < 0) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+			      ISC_LOGMODULE_SOCKET, ISC_LOG_DEBUG(10),
+			      "bind: %s", strbuf);
+		return (false);
+	}
+
+	if (getsockname(s, (struct sockaddr *)&ss, &len) < 0) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+			      ISC_LOGMODULE_SOCKET, ISC_LOG_DEBUG(10),
+			      "getsockname: %s", strbuf);
+		return (false);
+	}
+
+	iovec.iov_base = buf;
+	iovec.iov_len = sizeof(buf);
+
+	memset(&msg, 0, sizeof(msg));
+	msg.msg_name = (struct sockaddr *)&ss;
+	msg.msg_namelen = len;
+	msg.msg_iov = &iovec;
+	msg.msg_iovlen = 1;
+	msg.msg_control = (void*)&control;
+	msg.msg_controllen = 0;
+	msg.msg_flags = 0;
+
+	cmsgp = msg.msg_control;
+
+	switch (type) {
+#ifdef IP_TOS
+	case IP_TOS:
+		memset(cmsgp, 0, cmsg_space(sizeof(char)));
+		cmsgp->cmsg_level = level;
+		cmsgp->cmsg_type = type;
+		cmsgp->cmsg_len = cmsg_len(sizeof(char));
+		*(unsigned char*)CMSG_DATA(cmsgp) = dscp;
+		msg.msg_controllen += cmsg_space(sizeof(char));
+		break;
+#endif
+#ifdef IPV6_TCLASS
+	case IPV6_TCLASS:
+		memset(cmsgp, 0, cmsg_space(sizeof(dscp)));
+		cmsgp->cmsg_level = level;
+		cmsgp->cmsg_type = type;
+		cmsgp->cmsg_len = cmsg_len(sizeof(dscp));
+		memmove(CMSG_DATA(cmsgp), &dscp, sizeof(dscp));
+		msg.msg_controllen += cmsg_space(sizeof(dscp));
+		break;
+#endif
+	default:
+		INSIST(0);
+	}
+
+	if (sendmsg(s, &msg, 0) < 0) {
+		int debug = ISC_LOG_DEBUG(10);
+		const char *typestr;
+		const char *msgstr;
+		switch (errno) {
+#ifdef ENOPROTOOPT
+		case ENOPROTOOPT:
+#endif
+#ifdef EOPNOTSUPP
+		case EOPNOTSUPP:
+#endif
+		case EINVAL:
+		case EPERM:
+			break;
+		default:
+			debug = ISC_LOG_NOTICE;
+		}
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		if (debug != ISC_LOG_NOTICE) {
+			isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+				      ISC_LOGMODULE_SOCKET, ISC_LOG_DEBUG(10),
+				      "sendmsg: %s", strbuf);
+		} else {
+			typestr = (type == IP_TOS) ? "IP_TOS" : "IPV6_TCLASS";
+			msgstr = isc_msgcat_get(isc_msgcat, ISC_MSGSET_GENERAL,
+						ISC_MSG_FAILED, "failed");
+			UNEXPECTED_ERROR(__FILE__, __LINE__, "probing "
+					 "sendmsg() with %s=%02x %s: %s",
+					 typestr, dscp, msgstr, strbuf);
+		}
+		return (false);
+	}
+
+	/*
+	 * Make sure the message actually got sent.
+	 */
+	result = make_nonblock(s);
+	RUNTIME_CHECK(result == ISC_R_SUCCESS);
+
+	iovec.iov_base = buf;
+	iovec.iov_len = sizeof(buf);
+
+	memset(&msg, 0, sizeof(msg));
+	msg.msg_name = (struct sockaddr *)&ss;
+	msg.msg_namelen = sizeof(ss);
+	msg.msg_iov = &iovec;
+	msg.msg_iovlen = 1;
+	msg.msg_control = NULL;
+	msg.msg_controllen = 0;
+	msg.msg_flags = 0;
+
+	if (recvmsg(s, &msg, 0) < 0)
+		return (false);
+
+	return (true);
+}
+#endif
+#endif
+
+static void
+try_dscp_v4(void) {
+#ifdef IP_TOS
+	char strbuf[ISC_STRERRORSIZE];
+	struct addrinfo hints, *res0;
+	int s, dscp = 0, n;
+#ifdef IP_RECVTOS
+	int on = 1;
+#endif /* IP_RECVTOS */
+
+	memset(&hints, 0, sizeof(hints));
+	hints.ai_family = AF_INET;
+	hints.ai_socktype = SOCK_DGRAM;
+	hints.ai_protocol = IPPROTO_UDP;
+#ifdef AI_NUMERICHOST
+	hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
+#else
+	hints.ai_flags = AI_PASSIVE;
+#endif
+
+	n = getaddrinfo("127.0.0.1", NULL, &hints, &res0);
+	if (n != 0 || res0 == NULL) {
+		isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+			      ISC_LOGMODULE_SOCKET, ISC_LOG_DEBUG(10),
+			      "getaddrinfo(127.0.0.1): %s", gai_strerror(n));
+		return;
+	}
+
+	s = socket(res0->ai_family, res0->ai_socktype, res0->ai_protocol);
+
+	if (s == -1) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+			      ISC_LOGMODULE_SOCKET, ISC_LOG_DEBUG(10),
+			      "socket: %s", strbuf);
+		freeaddrinfo(res0);
+		return;
+	}
+
+	if (setsockopt(s, IPPROTO_IP, IP_TOS, &dscp, sizeof(dscp)) == 0)
+		dscp_result |= ISC_NET_DSCPSETV4;
+
+#ifdef IP_RECVTOS
+	on = 1;
+	if (setsockopt(s, IPPROTO_IP, IP_RECVTOS, &on, sizeof(on)) == 0)
+		dscp_result |= ISC_NET_DSCPRECVV4;
+#endif /* IP_RECVTOS */
+
+#ifdef ISC_NET_BSD44MSGHDR
+
+#if ISC_CMSG_IP_TOS
+	if (cmsgsend(s, IPPROTO_IP, IP_TOS, res0))
+		dscp_result |= ISC_NET_DSCPPKTV4;
+#endif /* ISC_CMSG_IP_TOS */
+
+#endif /* ISC_NET_BSD44MSGHDR */
+
+	freeaddrinfo(res0);
+	close(s);
+
+#endif /* IP_TOS */
+}
+
+static void
+try_dscp_v6(void) {
+#ifdef ISC_PLATFORM_HAVEIPV6
+#ifdef WANT_IPV6
+#ifdef IPV6_TCLASS
+	char strbuf[ISC_STRERRORSIZE];
+	struct addrinfo hints, *res0;
+	int s, dscp = 0, n;
+#if defined(IPV6_RECVTCLASS)
+	int on = 1;
+#endif /* IPV6_RECVTCLASS */
+
+	memset(&hints, 0, sizeof(hints));
+	hints.ai_family = AF_INET6;
+	hints.ai_socktype = SOCK_DGRAM;
+	hints.ai_protocol = IPPROTO_UDP;
+#ifdef AI_NUMERICHOST
+	hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
+#else
+	hints.ai_flags = AI_PASSIVE;
+#endif
+
+	n = getaddrinfo("::1", NULL, &hints, &res0);
+	if (n != 0 || res0 == NULL) {
+		isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+			      ISC_LOGMODULE_SOCKET, ISC_LOG_DEBUG(10),
+			      "getaddrinfo(::1): %s", gai_strerror(n));
+		return;
+	}
+
+	s = socket(res0->ai_family, res0->ai_socktype, res0->ai_protocol);
+	if (s == -1) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+			      ISC_LOGMODULE_SOCKET, ISC_LOG_DEBUG(10),
+			      "socket: %s", strbuf);
+		freeaddrinfo(res0);
+		return;
+	}
+	if (setsockopt(s, IPPROTO_IPV6, IPV6_TCLASS, &dscp, sizeof(dscp)) == 0)
+		dscp_result |= ISC_NET_DSCPSETV6;
+
+#ifdef IPV6_RECVTCLASS
+	on = 1;
+	if (setsockopt(s, IPPROTO_IPV6, IPV6_RECVTCLASS, &on, sizeof(on)) == 0)
+		dscp_result |= ISC_NET_DSCPRECVV6;
+#endif /* IPV6_RECVTCLASS */
+
+#ifdef ISC_NET_BSD44MSGHDR
+	if (cmsgsend(s, IPPROTO_IPV6, IPV6_TCLASS, res0))
+		dscp_result |= ISC_NET_DSCPPKTV6;
+#endif /* ISC_NET_BSD44MSGHDR */
+
+	freeaddrinfo(res0);
+	close(s);
+
+#endif /* IPV6_TCLASS */
+#endif /* WANT_IPV6 */
+#endif /* ISC_PLATFORM_HAVEIPV6 */
+}
+
+static void
+try_dscp(void) {
+	try_dscp_v4();
+	try_dscp_v6();
+}
+
+static void
+initialize_dscp(void) {
+	RUNTIME_CHECK(isc_once_do(&once_dscp, try_dscp) == ISC_R_SUCCESS);
+}
+
+unsigned int
+isc_net_probedscp(void) {
+	initialize_dscp();
+	return (dscp_result);
+}
+
+#if defined(USE_SYSCTL_PORTRANGE)
+#if defined(HAVE_SYSCTLBYNAME)
+static isc_result_t
+getudpportrange_sysctl(int af, in_port_t *low, in_port_t *high) {
+	int port_low, port_high;
+	size_t portlen;
+	const char *sysctlname_lowport, *sysctlname_hiport;
+
+	if (af == AF_INET) {
+		sysctlname_lowport = SYSCTL_V4PORTRANGE_LOW;
+		sysctlname_hiport = SYSCTL_V4PORTRANGE_HIGH;
+	} else {
+		sysctlname_lowport = SYSCTL_V6PORTRANGE_LOW;
+		sysctlname_hiport = SYSCTL_V6PORTRANGE_HIGH;
+	}
+	portlen = sizeof(port_low);
+	if (sysctlbyname(sysctlname_lowport, &port_low, &portlen,
+			 NULL, 0) < 0) {
+		return (ISC_R_FAILURE);
+	}
+	portlen = sizeof(port_high);
+	if (sysctlbyname(sysctlname_hiport, &port_high, &portlen,
+			 NULL, 0) < 0) {
+		return (ISC_R_FAILURE);
+	}
+	if ((port_low & ~0xffff) != 0 || (port_high & ~0xffff) != 0)
+		return (ISC_R_RANGE);
+
+	*low = (in_port_t)port_low;
+	*high = (in_port_t)port_high;
+
+	return (ISC_R_SUCCESS);
+}
+#else /* !HAVE_SYSCTLBYNAME */
+static isc_result_t
+getudpportrange_sysctl(int af, in_port_t *low, in_port_t *high) {
+	int mib_lo4[4] = SYSCTL_V4PORTRANGE_LOW;
+	int mib_hi4[4] = SYSCTL_V4PORTRANGE_HIGH;
+	int mib_lo6[4] = SYSCTL_V6PORTRANGE_LOW;
+	int mib_hi6[4] = SYSCTL_V6PORTRANGE_HIGH;
+	int *mib_lo, *mib_hi, miblen;
+	int port_low, port_high;
+	size_t portlen;
+
+	if (af == AF_INET) {
+		mib_lo = mib_lo4;
+		mib_hi = mib_hi4;
+		miblen = sizeof(mib_lo4) / sizeof(mib_lo4[0]);
+	} else {
+		mib_lo = mib_lo6;
+		mib_hi = mib_hi6;
+		miblen = sizeof(mib_lo6) / sizeof(mib_lo6[0]);
+	}
+
+	portlen = sizeof(port_low);
+	if (sysctl(mib_lo, miblen, &port_low, &portlen, NULL, 0) < 0) {
+		return (ISC_R_FAILURE);
+	}
+
+	portlen = sizeof(port_high);
+	if (sysctl(mib_hi, miblen, &port_high, &portlen, NULL, 0) < 0) {
+		return (ISC_R_FAILURE);
+	}
+
+	if ((port_low & ~0xffff) != 0 || (port_high & ~0xffff) != 0)
+		return (ISC_R_RANGE);
+
+	*low = (in_port_t) port_low;
+	*high = (in_port_t) port_high;
+
+	return (ISC_R_SUCCESS);
+}
+#endif /* HAVE_SYSCTLBYNAME */
+#endif /* USE_SYSCTL_PORTRANGE */
+
+isc_result_t
+isc_net_getudpportrange(int af, in_port_t *low, in_port_t *high) {
+	int result = ISC_R_FAILURE;
+#if !defined(USE_SYSCTL_PORTRANGE) && defined(__linux)
+	FILE *fp;
+#endif
+
+	REQUIRE(low != NULL && high != NULL);
+
+#if defined(USE_SYSCTL_PORTRANGE)
+	result = getudpportrange_sysctl(af, low, high);
+#elif defined(__linux)
+
+	UNUSED(af);
+
+	/*
+	 * Linux local ports are address family agnostic.
+	 */
+	fp = fopen("/proc/sys/net/ipv4/ip_local_port_range", "r");
+	if (fp != NULL) {
+		int n;
+		unsigned int l, h;
+
+		n = fscanf(fp, "%u %u", &l, &h);
+		if (n == 2 && (l & ~0xffff) == 0 && (h & ~0xffff) == 0) {
+			*low = l;
+			*high = h;
+			result = ISC_R_SUCCESS;
+		}
+		fclose(fp);
+	}
+#else
+	UNUSED(af);
+#endif
+
+	if (result != ISC_R_SUCCESS) {
+		*low = ISC_NET_PORTRANGELOW;
+		*high = ISC_NET_PORTRANGEHIGH;
+	}
+
+	return (ISC_R_SUCCESS);	/* we currently never fail in this function */
+}
+
+void
+isc_net_disableipv4(void) {
+	initialize();
+	if (ipv4_result == ISC_R_SUCCESS)
+		ipv4_result = ISC_R_DISABLED;
+}
+
+void
+isc_net_disableipv6(void) {
+	initialize();
+	if (ipv6_result == ISC_R_SUCCESS)
+		ipv6_result = ISC_R_DISABLED;
+}
+
+void
+isc_net_enableipv4(void) {
+	initialize();
+	if (ipv4_result == ISC_R_DISABLED)
+		ipv4_result = ISC_R_SUCCESS;
+}
+
+void
+isc_net_enableipv6(void) {
+	initialize();
+	if (ipv6_result == ISC_R_DISABLED)
+		ipv6_result = ISC_R_SUCCESS;
+}
diff --git a/lib/isc/unix/os.c b/lib/isc/unix/os.c
new file mode 100644
index 0000000..8cff6b6
--- /dev/null
+++ b/lib/isc/unix/os.c
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+
+#include <config.h>
+
+#include <isc/os.h>
+
+
+#ifdef HAVE_SYSCONF
+
+#include <unistd.h>
+
+#ifndef __hpux
+static inline long
+sysconf_ncpus(void) {
+#if defined(_SC_NPROCESSORS_ONLN)
+	return sysconf((_SC_NPROCESSORS_ONLN));
+#elif defined(_SC_NPROC_ONLN)
+	return sysconf((_SC_NPROC_ONLN));
+#else
+	return (0);
+#endif
+}
+#endif
+#endif /* HAVE_SYSCONF */
+
+
+#ifdef __hpux
+
+#include <sys/pstat.h>
+
+static inline int
+hpux_ncpus(void) {
+	struct pst_dynamic psd;
+	if (pstat_getdynamic(&psd, sizeof(psd), 1, 0) != -1)
+		return (psd.psd_proc_cnt);
+	else
+		return (0);
+}
+
+#endif /* __hpux */
+
+#if defined(HAVE_SYS_SYSCTL_H) && defined(HAVE_SYSCTLBYNAME)
+#include <sys/types.h>  /* for FreeBSD */
+#include <sys/param.h>  /* for NetBSD */
+#include <sys/sysctl.h>
+
+static int
+sysctl_ncpus(void) {
+	int ncpu, result;
+	size_t len;
+
+	len = sizeof(ncpu);
+	result = sysctlbyname("hw.ncpu", &ncpu, &len , 0, 0);
+	if (result != -1)
+		return (ncpu);
+	return (0);
+}
+#endif
+
+unsigned int
+isc_os_ncpus(void) {
+	long ncpus = 0;
+
+#ifdef __hpux
+	ncpus = hpux_ncpus();
+#elif defined(HAVE_SYSCONF)
+	ncpus = sysconf_ncpus();
+#endif
+#if defined(HAVE_SYS_SYSCTL_H) && defined(HAVE_SYSCTLBYNAME)
+	if (ncpus <= 0)
+		ncpus = sysctl_ncpus();
+#endif
+	if (ncpus <= 0)
+		ncpus = 1;
+
+	return ((unsigned int)ncpus);
+}
diff --git a/lib/isc/unix/pk11_api.c b/lib/isc/unix/pk11_api.c
new file mode 100644
index 0000000..bbc55af
--- /dev/null
+++ b/lib/isc/unix/pk11_api.c
@@ -0,0 +1,681 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+
+/*! \file */
+
+#include <config.h>
+
+#include <string.h>
+#include <dlfcn.h>
+
+#include <isc/log.h>
+#include <isc/mem.h>
+#include <isc/once.h>
+#include <isc/print.h>
+#include <isc/stdio.h>
+#include <isc/thread.h>
+#include <isc/util.h>
+
+#include <pkcs11/cryptoki.h>
+#include <pkcs11/pkcs11.h>
+
+#define KEEP_PKCS11_NAMES
+#include <pk11/pk11.h>
+#include <pk11/internal.h>
+
+static void *hPK11 = NULL;
+static char loaderrmsg[1024];
+
+CK_RV
+pkcs_C_Initialize(CK_VOID_PTR pReserved) {
+	CK_C_Initialize sym;
+
+	if (hPK11 != NULL)
+		return (CKR_LIBRARY_ALREADY_INITIALIZED);
+
+	hPK11 = dlopen(pk11_get_lib_name(), RTLD_NOW);
+
+	if (hPK11 == NULL) {
+		snprintf(loaderrmsg, sizeof(loaderrmsg),
+			 "dlopen(\"%s\") failed: %s\n",
+			 pk11_get_lib_name(), dlerror());
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	}
+	sym = (CK_C_Initialize)dlsym(hPK11, "C_Initialize");
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(pReserved);
+}
+
+char *pk11_get_load_error_message(void) {
+	return (loaderrmsg);
+}
+
+CK_RV
+pkcs_C_Finalize(CK_VOID_PTR pReserved) {
+	CK_C_Finalize sym;
+	CK_RV rv;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	sym = (CK_C_Finalize)dlsym(hPK11, "C_Finalize");
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	rv = (*sym)(pReserved);
+	if ((rv == CKR_OK) && (dlclose(hPK11) != 0))
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	hPK11 = NULL;
+	return (rv);
+}
+
+CK_RV
+pkcs_C_GetSlotList(CK_BBOOL tokenPresent, CK_SLOT_ID_PTR pSlotList,
+		   CK_ULONG_PTR pulCount)
+{
+	static CK_C_GetSlotList sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_GetSlotList)dlsym(hPK11, "C_GetSlotList");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(tokenPresent, pSlotList, pulCount);
+}
+
+CK_RV
+pkcs_C_GetTokenInfo(CK_SLOT_ID slotID, CK_TOKEN_INFO_PTR pInfo) {
+	static CK_C_GetTokenInfo sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_GetTokenInfo)dlsym(hPK11, "C_GetTokenInfo");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(slotID, pInfo);
+}
+
+CK_RV
+pkcs_C_GetMechanismInfo(CK_SLOT_ID slotID, CK_MECHANISM_TYPE type,
+			CK_MECHANISM_INFO_PTR pInfo)
+{
+	static CK_C_GetMechanismInfo sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_GetMechanismInfo)dlsym(hPK11,
+						   "C_GetMechanismInfo");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(slotID, type, pInfo);
+}
+
+CK_RV
+pkcs_C_OpenSession(CK_SLOT_ID slotID, CK_FLAGS flags,
+		   CK_VOID_PTR pApplication,
+		   CK_RV  (*Notify) (CK_SESSION_HANDLE hSession,
+				     CK_NOTIFICATION event,
+				     CK_VOID_PTR pApplication),
+		   CK_SESSION_HANDLE_PTR phSession)
+{
+	static CK_C_OpenSession sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		hPK11 = dlopen(pk11_get_lib_name(), RTLD_NOW);
+	if (hPK11 == NULL) {
+		snprintf(loaderrmsg, sizeof(loaderrmsg),
+			 "dlopen(\"%s\") failed: %s\n",
+			 pk11_get_lib_name(), dlerror());
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	}
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_OpenSession)dlsym(hPK11, "C_OpenSession");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(slotID, flags, pApplication, Notify, phSession);
+}
+
+CK_RV
+pkcs_C_CloseSession(CK_SESSION_HANDLE hSession) {
+	static CK_C_CloseSession sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_CloseSession)dlsym(hPK11, "C_CloseSession");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(hSession);
+}
+
+CK_RV
+pkcs_C_Login(CK_SESSION_HANDLE hSession, CK_USER_TYPE userType,
+	     CK_CHAR_PTR pPin, CK_ULONG usPinLen)
+{
+	static CK_C_Login sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_Login)dlsym(hPK11, "C_Login");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(hSession, userType, pPin, usPinLen);
+}
+
+CK_RV
+pkcs_C_Logout(CK_SESSION_HANDLE hSession) {
+	static CK_C_Logout sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_Logout)dlsym(hPK11, "C_Logout");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(hSession);
+}
+
+CK_RV
+pkcs_C_CreateObject(CK_SESSION_HANDLE hSession, CK_ATTRIBUTE_PTR pTemplate,
+		    CK_ULONG usCount, CK_OBJECT_HANDLE_PTR phObject)
+{
+	static CK_C_CreateObject sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_CreateObject)dlsym(hPK11, "C_CreateObject");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(hSession, pTemplate, usCount, phObject);
+}
+
+CK_RV
+pkcs_C_DestroyObject(CK_SESSION_HANDLE hSession, CK_OBJECT_HANDLE hObject) {
+	static CK_C_DestroyObject sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_DestroyObject)dlsym(hPK11, "C_DestroyObject");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(hSession, hObject);
+}
+
+CK_RV
+pkcs_C_GetAttributeValue(CK_SESSION_HANDLE hSession, CK_OBJECT_HANDLE hObject,
+			 CK_ATTRIBUTE_PTR pTemplate, CK_ULONG usCount)
+{
+	static CK_C_GetAttributeValue sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_GetAttributeValue)dlsym(hPK11,
+						    "C_GetAttributeValue");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(hSession, hObject, pTemplate, usCount);
+}
+
+CK_RV
+pkcs_C_SetAttributeValue(CK_SESSION_HANDLE hSession, CK_OBJECT_HANDLE hObject,
+			 CK_ATTRIBUTE_PTR pTemplate, CK_ULONG usCount)
+{
+	static CK_C_SetAttributeValue sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_SetAttributeValue)dlsym(hPK11,
+						    "C_SetAttributeValue");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(hSession, hObject, pTemplate, usCount);
+}
+
+CK_RV
+pkcs_C_FindObjectsInit(CK_SESSION_HANDLE hSession, CK_ATTRIBUTE_PTR pTemplate,
+		       CK_ULONG usCount)
+{
+	static CK_C_FindObjectsInit sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_FindObjectsInit)dlsym(hPK11, "C_FindObjectsInit");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(hSession, pTemplate, usCount);
+}
+
+CK_RV
+pkcs_C_FindObjects(CK_SESSION_HANDLE hSession, CK_OBJECT_HANDLE_PTR phObject,
+		   CK_ULONG usMaxObjectCount, CK_ULONG_PTR pusObjectCount)
+{
+	static CK_C_FindObjects sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_FindObjects)dlsym(hPK11, "C_FindObjects");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(hSession, phObject, usMaxObjectCount, pusObjectCount);
+}
+
+CK_RV
+pkcs_C_FindObjectsFinal(CK_SESSION_HANDLE hSession)
+{
+	static CK_C_FindObjectsFinal sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_FindObjectsFinal)dlsym(hPK11,
+						   "C_FindObjectsFinal");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(hSession);
+}
+
+CK_RV
+pkcs_C_EncryptInit(CK_SESSION_HANDLE hSession, CK_MECHANISM_PTR pMechanism,
+		   CK_OBJECT_HANDLE hKey)
+{
+	static CK_C_EncryptInit sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_EncryptInit)dlsym(hPK11, "C_EncryptInit");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(hSession, pMechanism, hKey);
+}
+
+CK_RV
+pkcs_C_Encrypt(CK_SESSION_HANDLE hSession, CK_BYTE_PTR pData,
+	       CK_ULONG ulDataLen, CK_BYTE_PTR pEncryptedData,
+	       CK_ULONG_PTR pulEncryptedDataLen)
+{
+	static CK_C_Encrypt sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_Encrypt)dlsym(hPK11, "C_Encrypt");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(hSession, pData, ulDataLen,
+		      pEncryptedData, pulEncryptedDataLen);
+}
+
+CK_RV
+pkcs_C_DigestInit(CK_SESSION_HANDLE hSession, CK_MECHANISM_PTR pMechanism) {
+	static CK_C_DigestInit sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_DigestInit)dlsym(hPK11, "C_DigestInit");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(hSession, pMechanism);
+}
+
+CK_RV
+pkcs_C_DigestUpdate(CK_SESSION_HANDLE hSession, CK_BYTE_PTR pPart,
+		    CK_ULONG ulPartLen)
+{
+	static CK_C_DigestUpdate sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_DigestUpdate)dlsym(hPK11, "C_DigestUpdate");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(hSession, pPart, ulPartLen);
+}
+
+CK_RV
+pkcs_C_DigestFinal(CK_SESSION_HANDLE hSession, CK_BYTE_PTR pDigest,
+		   CK_ULONG_PTR pulDigestLen)
+{
+	static CK_C_DigestFinal sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_DigestFinal)dlsym(hPK11, "C_DigestFinal");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(hSession, pDigest, pulDigestLen);
+}
+
+CK_RV
+pkcs_C_SignInit(CK_SESSION_HANDLE hSession, CK_MECHANISM_PTR pMechanism,
+		CK_OBJECT_HANDLE hKey)
+{
+	static CK_C_SignInit sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_SignInit)dlsym(hPK11, "C_SignInit");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(hSession, pMechanism, hKey);
+}
+
+CK_RV
+pkcs_C_Sign(CK_SESSION_HANDLE hSession, CK_BYTE_PTR pData,
+	    CK_ULONG ulDataLen, CK_BYTE_PTR pSignature,
+	    CK_ULONG_PTR pulSignatureLen)
+{
+	static CK_C_Sign sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_Sign)dlsym(hPK11, "C_Sign");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(hSession, pData, ulDataLen, pSignature, pulSignatureLen);
+}
+
+CK_RV
+pkcs_C_SignUpdate(CK_SESSION_HANDLE hSession, CK_BYTE_PTR pPart,
+		  CK_ULONG ulPartLen)
+{
+	static CK_C_SignUpdate sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_SignUpdate)dlsym(hPK11, "C_SignUpdate");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(hSession, pPart, ulPartLen);
+}
+
+CK_RV
+pkcs_C_SignFinal(CK_SESSION_HANDLE hSession, CK_BYTE_PTR pSignature,
+		 CK_ULONG_PTR pulSignatureLen)
+{
+	static CK_C_SignFinal sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_SignFinal)dlsym(hPK11, "C_SignFinal");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(hSession, pSignature, pulSignatureLen);
+}
+
+CK_RV
+pkcs_C_VerifyInit(CK_SESSION_HANDLE hSession, CK_MECHANISM_PTR pMechanism,
+		  CK_OBJECT_HANDLE hKey)
+{
+	static CK_C_VerifyInit sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_VerifyInit)dlsym(hPK11, "C_VerifyInit");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(hSession, pMechanism, hKey);
+}
+
+CK_RV
+pkcs_C_Verify(CK_SESSION_HANDLE hSession, CK_BYTE_PTR pData,
+	      CK_ULONG ulDataLen, CK_BYTE_PTR pSignature,
+	      CK_ULONG ulSignatureLen)
+{
+	static CK_C_Verify sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_Verify)dlsym(hPK11, "C_Verify");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(hSession, pData, ulDataLen, pSignature, ulSignatureLen);
+}
+
+CK_RV
+pkcs_C_VerifyUpdate(CK_SESSION_HANDLE hSession, CK_BYTE_PTR pPart,
+		    CK_ULONG ulPartLen)
+{
+	static CK_C_VerifyUpdate sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_VerifyUpdate)dlsym(hPK11, "C_VerifyUpdate");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(hSession, pPart, ulPartLen);
+}
+
+CK_RV
+pkcs_C_VerifyFinal(CK_SESSION_HANDLE hSession, CK_BYTE_PTR pSignature,
+		   CK_ULONG ulSignatureLen)
+{
+	static CK_C_VerifyFinal sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_VerifyFinal)dlsym(hPK11, "C_VerifyFinal");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(hSession, pSignature, ulSignatureLen);
+}
+
+CK_RV
+pkcs_C_GenerateKey(CK_SESSION_HANDLE hSession, CK_MECHANISM_PTR pMechanism,
+		   CK_ATTRIBUTE_PTR pTemplate, CK_ULONG ulCount,
+		   CK_OBJECT_HANDLE_PTR phKey)
+{
+	static CK_C_GenerateKey sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_GenerateKey)dlsym(hPK11, "C_GenerateKey");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(hSession, pMechanism, pTemplate, ulCount, phKey);
+}
+
+CK_RV
+pkcs_C_GenerateKeyPair(CK_SESSION_HANDLE hSession,
+		       CK_MECHANISM_PTR pMechanism,
+		       CK_ATTRIBUTE_PTR pPublicKeyTemplate,
+		       CK_ULONG usPublicKeyAttributeCount,
+		       CK_ATTRIBUTE_PTR pPrivateKeyTemplate,
+		       CK_ULONG usPrivateKeyAttributeCount,
+		       CK_OBJECT_HANDLE_PTR phPrivateKey,
+		       CK_OBJECT_HANDLE_PTR phPublicKey)
+{
+	static CK_C_GenerateKeyPair sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_GenerateKeyPair)dlsym(hPK11, "C_GenerateKeyPair");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(hSession,
+		      pMechanism,
+		      pPublicKeyTemplate,
+		      usPublicKeyAttributeCount,
+		      pPrivateKeyTemplate,
+		      usPrivateKeyAttributeCount,
+		      phPrivateKey,
+		      phPublicKey);
+}
+
+CK_RV
+pkcs_C_DeriveKey(CK_SESSION_HANDLE hSession, CK_MECHANISM_PTR pMechanism,
+		 CK_OBJECT_HANDLE hBaseKey, CK_ATTRIBUTE_PTR pTemplate,
+		 CK_ULONG ulAttributeCount, CK_OBJECT_HANDLE_PTR phKey)
+{
+	static CK_C_DeriveKey sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_DeriveKey)dlsym(hPK11, "C_DeriveKey");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(hSession,
+		      pMechanism,
+		      hBaseKey,
+		      pTemplate,
+		      ulAttributeCount,
+		      phKey);
+}
+
+CK_RV
+pkcs_C_SeedRandom(CK_SESSION_HANDLE hSession, CK_BYTE_PTR pSeed,
+		  CK_ULONG ulSeedLen)
+{
+	static CK_C_SeedRandom sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_SeedRandom)dlsym(hPK11, "C_SeedRandom");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(hSession, pSeed, ulSeedLen);
+}
+
+CK_RV
+pkcs_C_GenerateRandom(CK_SESSION_HANDLE hSession, CK_BYTE_PTR RandomData,
+		      CK_ULONG ulRandomLen)
+{
+	static CK_C_GenerateRandom sym = NULL;
+	static void *pPK11 = NULL;
+
+	if (hPK11 == NULL)
+		return (CKR_LIBRARY_FAILED_TO_LOAD);
+	if ((sym == NULL) || (hPK11 != pPK11)) {
+		pPK11 = hPK11;
+		sym = (CK_C_GenerateRandom)dlsym(hPK11, "C_GenerateRandom");
+	}
+	if (sym == NULL)
+		return (CKR_SYMBOL_RESOLUTION_FAILED);
+	return (*sym)(hSession, RandomData, ulRandomLen);
+}
diff --git a/lib/isc/unix/resource.c b/lib/isc/unix/resource.c
new file mode 100644
index 0000000..6d5c5aa
--- /dev/null
+++ b/lib/isc/unix/resource.c
@@ -0,0 +1,227 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+
+#include <config.h>
+
+#include <inttypes.h>
+#include <stdbool.h>
+
+#include <sys/types.h>
+#include <sys/time.h>	/* Required on some systems for <sys/resource.h>. */
+#include <sys/resource.h>
+
+#include <isc/platform.h>
+#include <isc/resource.h>
+#include <isc/result.h>
+#include <isc/util.h>
+
+#ifdef __linux__
+#include <linux/fs.h>	/* To get the large NR_OPEN. */
+#endif
+
+#if defined(__hpux) && defined(HAVE_SYS_DYNTUNE_H)
+#include <sys/dyntune.h>
+#endif
+
+#include "errno2result.h"
+
+static isc_result_t
+resource2rlim(isc_resource_t resource, int *rlim_resource) {
+	isc_result_t result = ISC_R_SUCCESS;
+
+	switch (resource) {
+	case isc_resource_coresize:
+		*rlim_resource = RLIMIT_CORE;
+		break;
+	case isc_resource_cputime:
+		*rlim_resource = RLIMIT_CPU;
+		break;
+	case isc_resource_datasize:
+		*rlim_resource = RLIMIT_DATA;
+		break;
+	case isc_resource_filesize:
+		*rlim_resource = RLIMIT_FSIZE;
+		break;
+	case isc_resource_lockedmemory:
+#ifdef RLIMIT_MEMLOCK
+		*rlim_resource = RLIMIT_MEMLOCK;
+#else
+		result = ISC_R_NOTIMPLEMENTED;
+#endif
+		break;
+	case isc_resource_openfiles:
+#ifdef RLIMIT_NOFILE
+		*rlim_resource = RLIMIT_NOFILE;
+#else
+		result = ISC_R_NOTIMPLEMENTED;
+#endif
+		break;
+	case isc_resource_processes:
+#ifdef RLIMIT_NPROC
+		*rlim_resource = RLIMIT_NPROC;
+#else
+		result = ISC_R_NOTIMPLEMENTED;
+#endif
+		break;
+	case isc_resource_residentsize:
+#ifdef RLIMIT_RSS
+		*rlim_resource = RLIMIT_RSS;
+#else
+		result = ISC_R_NOTIMPLEMENTED;
+#endif
+		break;
+	case isc_resource_stacksize:
+		*rlim_resource = RLIMIT_STACK;
+		break;
+	default:
+		/*
+		 * This test is not very robust if isc_resource_t
+		 * changes, but generates a clear assertion message.
+		 */
+		REQUIRE(resource >= isc_resource_coresize &&
+			resource <= isc_resource_stacksize);
+
+		result = ISC_R_RANGE;
+		break;
+	}
+
+	return (result);
+}
+
+isc_result_t
+isc_resource_setlimit(isc_resource_t resource, isc_resourcevalue_t value) {
+	struct rlimit rl;
+	ISC_PLATFORM_RLIMITTYPE rlim_value;
+	int unixresult;
+	int unixresource;
+	isc_result_t result;
+
+	result = resource2rlim(resource, &unixresource);
+	if (result != ISC_R_SUCCESS)
+		return (result);
+
+	if (value == ISC_RESOURCE_UNLIMITED)
+		rlim_value = RLIM_INFINITY;
+
+	else {
+		/*
+		 * isc_resourcevalue_t was chosen as an unsigned 64 bit
+		 * integer so that it could contain the maximum range of
+		 * reasonable values.  Unfortunately, this exceeds the typical
+		 * range on Unix systems.  Ensure the range of
+		 * ISC_PLATFORM_RLIMITTYPE is not overflowed.
+		 */
+		isc_resourcevalue_t rlim_max;
+		bool rlim_t_is_signed =
+			(((double)(ISC_PLATFORM_RLIMITTYPE)-1) < 0);
+
+		if (rlim_t_is_signed)
+			rlim_max = ~((ISC_PLATFORM_RLIMITTYPE)1 <<
+				     (sizeof(ISC_PLATFORM_RLIMITTYPE) * 8 - 1));
+		else
+			rlim_max = (ISC_PLATFORM_RLIMITTYPE)-1;
+
+		if (value > rlim_max)
+			value = rlim_max;
+
+		rlim_value = value;
+	}
+
+	rl.rlim_cur = rl.rlim_max = rlim_value;
+	unixresult = setrlimit(unixresource, &rl);
+
+	if (unixresult == 0)
+		return (ISC_R_SUCCESS);
+
+#if defined(OPEN_MAX) && defined(__APPLE__)
+	/*
+	 * The Darwin kernel doesn't accept RLIM_INFINITY for rlim_cur; the
+	 * maximum possible value is OPEN_MAX.  BIND8 used to use
+	 * sysconf(_SC_OPEN_MAX) for such a case, but this value is much
+	 * smaller than OPEN_MAX and is not really effective.
+	 */
+	if (resource == isc_resource_openfiles && rlim_value == RLIM_INFINITY) {
+		rl.rlim_cur = OPEN_MAX;
+		unixresult = setrlimit(unixresource, &rl);
+		if (unixresult == 0)
+			return (ISC_R_SUCCESS);
+	}
+#elif defined(__linux__)
+#ifndef NR_OPEN
+#define NR_OPEN (1024*1024)
+#endif
+
+	/*
+	 * Some Linux kernels don't accept RLIM_INFINIT; the maximum
+	 * possible value is the NR_OPEN defined in linux/fs.h.
+	 */
+	if (resource == isc_resource_openfiles && rlim_value == RLIM_INFINITY) {
+		rl.rlim_cur = rl.rlim_max = NR_OPEN;
+		unixresult = setrlimit(unixresource, &rl);
+		if (unixresult == 0)
+			return (ISC_R_SUCCESS);
+	}
+#elif defined(__hpux) && defined(HAVE_SYS_DYNTUNE_H)
+	if (resource == isc_resource_openfiles && rlim_value == RLIM_INFINITY) {
+		uint64_t maxfiles;
+		if (gettune("maxfiles_lim", &maxfiles) == 0) {
+			rl.rlim_cur = rl.rlim_max = maxfiles;
+			unixresult = setrlimit(unixresource, &rl);
+			if (unixresult == 0)
+				return (ISC_R_SUCCESS);
+		}
+	}
+#endif
+	if (resource == isc_resource_openfiles && rlim_value == RLIM_INFINITY) {
+		if (getrlimit(unixresource, &rl) == 0) {
+			rl.rlim_cur = rl.rlim_max;
+			unixresult = setrlimit(unixresource, &rl);
+			if (unixresult == 0)
+				return (ISC_R_SUCCESS);
+		}
+	}
+	return (isc__errno2result(errno));
+}
+
+isc_result_t
+isc_resource_getlimit(isc_resource_t resource, isc_resourcevalue_t *value) {
+	int unixresult;
+	int unixresource;
+	struct rlimit rl;
+	isc_result_t result;
+
+	result = resource2rlim(resource, &unixresource);
+	if (result == ISC_R_SUCCESS) {
+		unixresult = getrlimit(unixresource, &rl);
+		INSIST(unixresult == 0);
+		*value = rl.rlim_max;
+	}
+
+	return (result);
+}
+
+isc_result_t
+isc_resource_getcurlimit(isc_resource_t resource, isc_resourcevalue_t *value) {
+	int unixresult;
+	int unixresource;
+	struct rlimit rl;
+	isc_result_t result;
+
+	result = resource2rlim(resource, &unixresource);
+	if (result == ISC_R_SUCCESS) {
+		unixresult = getrlimit(unixresource, &rl);
+		INSIST(unixresult == 0);
+		*value = rl.rlim_cur;
+	}
+
+	return (result);
+}
diff --git a/lib/isc/unix/socket.c b/lib/isc/unix/socket.c
new file mode 100644
index 0000000..5a40768
--- /dev/null
+++ b/lib/isc/unix/socket.c
@@ -0,0 +1,6848 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*! \file */
+
+#include <config.h>
+
+#include <inttypes.h>
+#include <stdbool.h>
+
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#ifdef HAVE_SYS_SYSCTL_H
+#include <sys/sysctl.h>
+#endif
+#include <sys/time.h>
+#include <sys/uio.h>
+
+#if defined(HAVE_LINUX_NETLINK_H) && defined(HAVE_LINUX_RTNETLINK_H)
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+#endif
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <isc/buffer.h>
+#include <isc/bufferlist.h>
+#include <isc/condition.h>
+#include <isc/formatcheck.h>
+#include <isc/json.h>
+#include <isc/list.h>
+#include <isc/log.h>
+#include <isc/mem.h>
+#include <isc/msgs.h>
+#include <isc/mutex.h>
+#include <isc/net.h>
+#include <isc/once.h>
+#include <isc/platform.h>
+#include <isc/print.h>
+#include <isc/region.h>
+#include <isc/resource.h>
+#include <isc/socket.h>
+#include <isc/stats.h>
+#include <isc/strerror.h>
+#include <isc/string.h>
+#include <isc/task.h>
+#include <isc/thread.h>
+#include <isc/util.h>
+#include <isc/xml.h>
+
+#ifdef ISC_PLATFORM_HAVESYSUNH
+#include <sys/un.h>
+#endif
+#ifdef ISC_PLATFORM_HAVEKQUEUE
+#include <sys/event.h>
+#endif
+#ifdef ISC_PLATFORM_HAVEEPOLL
+#include <sys/epoll.h>
+#endif
+#ifdef ISC_PLATFORM_HAVEDEVPOLL
+#if defined(HAVE_SYS_DEVPOLL_H)
+#include <sys/devpoll.h>
+#elif defined(HAVE_DEVPOLL_H)
+#include <devpoll.h>
+#endif
+#endif
+
+#include <netinet/tcp.h>
+
+#include "errno2result.h"
+
+/* See task.c about the following definition: */
+#ifdef ISC_PLATFORM_USETHREADS
+#define USE_WATCHER_THREAD
+#else
+#define USE_SHARED_MANAGER
+#endif	/* ISC_PLATFORM_USETHREADS */
+
+#ifndef USE_WATCHER_THREAD
+#include "socket_p.h"
+#include "../task_p.h"
+#endif /* USE_WATCHER_THREAD */
+
+#if defined(SO_BSDCOMPAT) && defined(__linux__)
+#include <sys/utsname.h>
+#endif
+
+#ifdef ISC_PLATFORM_HAVETFO
+#include <netinet/tcp.h>
+#endif
+
+/*%
+ * Choose the most preferable multiplex method.
+ */
+#ifdef ISC_PLATFORM_HAVEKQUEUE
+#define USE_KQUEUE
+#elif defined (ISC_PLATFORM_HAVEEPOLL)
+#define USE_EPOLL
+#elif defined (ISC_PLATFORM_HAVEDEVPOLL)
+#define USE_DEVPOLL
+typedef struct {
+	unsigned int want_read : 1,
+		want_write : 1;
+} pollinfo_t;
+#else
+#define USE_SELECT
+#endif	/* ISC_PLATFORM_HAVEKQUEUE */
+
+#ifndef USE_WATCHER_THREAD
+#if defined(USE_KQUEUE) || defined(USE_EPOLL) || defined(USE_DEVPOLL)
+struct isc_socketwait {
+	int nevents;
+};
+#elif defined (USE_SELECT)
+struct isc_socketwait {
+	fd_set *readset;
+	fd_set *writeset;
+	int nfds;
+	int maxfd;
+};
+#endif	/* USE_KQUEUE */
+#endif /* !USE_WATCHER_THREAD */
+
+/*
+ * Set by the -T dscp option on the command line. If set to a value
+ * other than -1, we check to make sure DSCP values match it, and
+ * assert if not.
+ */
+int isc_dscp_check_value = -1;
+
+/*%
+ * Maximum number of allowable open sockets.  This is also the maximum
+ * allowable socket file descriptor.
+ *
+ * Care should be taken before modifying this value for select():
+ * The API standard doesn't ensure select() accept more than (the system default
+ * of) FD_SETSIZE descriptors, and the default size should in fact be fine in
+ * the vast majority of cases.  This constant should therefore be increased only
+ * when absolutely necessary and possible, i.e., the server is exhausting all
+ * available file descriptors (up to FD_SETSIZE) and the select() function
+ * and FD_xxx macros support larger values than FD_SETSIZE (which may not
+ * always by true, but we keep using some of them to ensure as much
+ * portability as possible).  Note also that overall server performance
+ * may be rather worsened with a larger value of this constant due to
+ * inherent scalability problems of select().
+ *
+ * As a special note, this value shouldn't have to be touched if
+ * this is a build for an authoritative only DNS server.
+ */
+#ifndef ISC_SOCKET_MAXSOCKETS
+#if defined(USE_KQUEUE) || defined(USE_EPOLL) || defined(USE_DEVPOLL)
+#ifdef TUNE_LARGE
+#define ISC_SOCKET_MAXSOCKETS 21000
+#else
+#define ISC_SOCKET_MAXSOCKETS 4096
+#endif /* TUNE_LARGE */
+#elif defined(USE_SELECT)
+#define ISC_SOCKET_MAXSOCKETS FD_SETSIZE
+#endif	/* USE_KQUEUE... */
+#endif	/* ISC_SOCKET_MAXSOCKETS */
+
+#ifdef USE_SELECT
+/*%
+ * Mac OS X needs a special definition to support larger values in select().
+ * We always define this because a larger value can be specified run-time.
+ */
+#ifdef __APPLE__
+#define _DARWIN_UNLIMITED_SELECT
+#endif	/* __APPLE__ */
+#endif	/* USE_SELECT */
+
+#ifdef ISC_SOCKET_USE_POLLWATCH
+/*%
+ * If this macro is defined, enable workaround for a Solaris /dev/poll kernel
+ * bug: DP_POLL ioctl could keep sleeping even if socket I/O is possible for
+ * some of the specified FD.  The idea is based on the observation that it's
+ * likely for a busy server to keep receiving packets.  It specifically works
+ * as follows: the socket watcher is first initialized with the state of
+ * "poll_idle".  While it's in the idle state it keeps sleeping until a socket
+ * event occurs.  When it wakes up for a socket I/O event, it moves to the
+ * poll_active state, and sets the poll timeout to a short period
+ * (ISC_SOCKET_POLLWATCH_TIMEOUT msec).  If timeout occurs in this state, the
+ * watcher goes to the poll_checking state with the same timeout period.
+ * In this state, the watcher tries to detect whether this is a break
+ * during intermittent events or the kernel bug is triggered.  If the next
+ * polling reports an event within the short period, the previous timeout is
+ * likely to be a kernel bug, and so the watcher goes back to the active state.
+ * Otherwise, it moves to the idle state again.
+ *
+ * It's not clear whether this is a thread-related bug, but since we've only
+ * seen this with threads, this workaround is used only when enabling threads.
+ */
+
+typedef enum { poll_idle, poll_active, poll_checking } pollstate_t;
+
+#ifndef ISC_SOCKET_POLLWATCH_TIMEOUT
+#define ISC_SOCKET_POLLWATCH_TIMEOUT 10
+#endif	/* ISC_SOCKET_POLLWATCH_TIMEOUT */
+#endif	/* ISC_SOCKET_USE_POLLWATCH */
+
+/*%
+ * Size of per-FD lock buckets.
+ */
+#ifdef ISC_PLATFORM_USETHREADS
+#define FDLOCK_COUNT		1024
+#define FDLOCK_ID(fd)		((fd) % FDLOCK_COUNT)
+#else
+#define FDLOCK_COUNT		1
+#define FDLOCK_ID(fd)		0
+#endif	/* ISC_PLATFORM_USETHREADS */
+
+/*%
+ * Maximum number of events communicated with the kernel.  There should normally
+ * be no need for having a large number.
+ */
+#if defined(USE_KQUEUE) || defined(USE_EPOLL) || defined(USE_DEVPOLL)
+#ifndef ISC_SOCKET_MAXEVENTS
+#ifdef TUNE_LARGE
+#define ISC_SOCKET_MAXEVENTS	2048
+#else
+#define ISC_SOCKET_MAXEVENTS	64
+#endif /* TUNE_LARGE */
+#endif
+#endif
+
+/*%
+ * Some systems define the socket length argument as an int, some as size_t,
+ * some as socklen_t.  This is here so it can be easily changed if needed.
+ */
+#ifndef ISC_SOCKADDR_LEN_T
+#define ISC_SOCKADDR_LEN_T unsigned int
+#endif
+
+/*%
+ * Define what the possible "soft" errors can be.  These are non-fatal returns
+ * of various network related functions, like recv() and so on.
+ *
+ * For some reason, BSDI (and perhaps others) will sometimes return <0
+ * from recv() but will have errno==0.  This is broken, but we have to
+ * work around it here.
+ */
+#define SOFT_ERROR(e)	((e) == EAGAIN || \
+			 (e) == EWOULDBLOCK || \
+			 (e) == ENOBUFS || \
+			 (e) == EINTR || \
+			 (e) == 0)
+
+#define DLVL(x) ISC_LOGCATEGORY_GENERAL, ISC_LOGMODULE_SOCKET, ISC_LOG_DEBUG(x)
+
+/*!<
+ * DLVL(90)  --  Function entry/exit and other tracing.
+ * DLVL(70)  --  Socket "correctness" -- including returning of events, etc.
+ * DLVL(60)  --  Socket data send/receive
+ * DLVL(50)  --  Event tracing, including receiving/sending completion events.
+ * DLVL(20)  --  Socket creation/destruction.
+ */
+#define TRACE_LEVEL		90
+#define CORRECTNESS_LEVEL	70
+#define IOEVENT_LEVEL		60
+#define EVENT_LEVEL		50
+#define CREATION_LEVEL		20
+
+#define TRACE		DLVL(TRACE_LEVEL)
+#define CORRECTNESS	DLVL(CORRECTNESS_LEVEL)
+#define IOEVENT		DLVL(IOEVENT_LEVEL)
+#define EVENT		DLVL(EVENT_LEVEL)
+#define CREATION	DLVL(CREATION_LEVEL)
+
+typedef isc_event_t intev_t;
+
+#define SOCKET_MAGIC		ISC_MAGIC('I', 'O', 'i', 'o')
+#define VALID_SOCKET(s)		ISC_MAGIC_VALID(s, SOCKET_MAGIC)
+
+/*!
+ * IPv6 control information.  If the socket is an IPv6 socket we want
+ * to collect the destination address and interface so the client can
+ * set them on outgoing packets.
+ */
+#ifdef ISC_PLATFORM_HAVEIN6PKTINFO
+#ifndef USE_CMSG
+#define USE_CMSG	1
+#endif
+#endif
+
+/*%
+ * NetBSD and FreeBSD can timestamp packets.  XXXMLG Should we have
+ * a setsockopt() like interface to request timestamps, and if the OS
+ * doesn't do it for us, call gettimeofday() on every UDP receive?
+ */
+#ifdef SO_TIMESTAMP
+#ifndef USE_CMSG
+#define USE_CMSG	1
+#endif
+#endif
+
+/*%
+ * The size to raise the receive buffer to (from BIND 8).
+ */
+#ifdef TUNE_LARGE
+#ifdef sun
+#define RCVBUFSIZE (1*1024*1024)
+#else
+#define RCVBUFSIZE (16*1024*1024)
+#endif
+#else
+#define RCVBUFSIZE (32*1024)
+#endif /* TUNE_LARGE */
+
+/*%
+ * Instead of calculating the cmsgbuf lengths every time we take
+ * a rule of thumb approach - sizes are taken from x86_64 linux,
+ * multiplied by 2, everything should fit. Those sizes are not
+ * large enough to cause any concern.
+ */
+#if defined(USE_CMSG) && defined(ISC_PLATFORM_HAVEIN6PKTINFO)
+#define CMSG_SP_IN6PKT 40
+#else
+#define CMSG_SP_IN6PKT 0
+#endif
+
+#if defined(USE_CMSG) && defined(SO_TIMESTAMP)
+#define CMSG_SP_TIMESTAMP 32
+#else
+#define CMSG_SP_TIMESTAMP 0
+#endif
+
+#if defined(USE_CMSG) && (defined(IPV6_TCLASS) || defined(IP_TOS))
+#define CMSG_SP_TCTOS 24
+#else
+#define CMSG_SP_TCTOS 0
+#endif
+
+#define CMSG_SP_INT 24
+
+/* Align cmsg buffers to be safe on SPARC etc. */
+#define RECVCMSGBUFLEN ISC_ALIGN(2*(CMSG_SP_IN6PKT + CMSG_SP_TIMESTAMP + CMSG_SP_TCTOS)+1, sizeof(void*))
+#define SENDCMSGBUFLEN ISC_ALIGN(2*(CMSG_SP_IN6PKT + CMSG_SP_INT + CMSG_SP_TCTOS)+1, sizeof(void*))
+
+/*%
+ * The number of times a send operation is repeated if the result is EINTR.
+ */
+#define NRETRIES 10
+
+typedef struct isc__socket isc__socket_t;
+typedef struct isc__socketmgr isc__socketmgr_t;
+
+#define NEWCONNSOCK(ev) ((isc__socket_t *)(ev)->newsocket)
+
+struct isc__socket {
+	/* Not locked. */
+	isc_socket_t		common;
+	isc__socketmgr_t	*manager;
+	isc_mutex_t		lock;
+	isc_sockettype_t	type;
+	const isc_statscounter_t	*statsindex;
+
+	/* Locked by socket lock. */
+	ISC_LINK(isc__socket_t)	link;
+	unsigned int		references;
+	int			fd;
+	int			pf;
+	char				name[16];
+	void *				tag;
+
+	ISC_LIST(isc_socketevent_t)		send_list;
+	ISC_LIST(isc_socketevent_t)		recv_list;
+	ISC_LIST(isc_socket_newconnev_t)	accept_list;
+	ISC_LIST(isc_socket_connev_t)		connect_list;
+
+	/*
+	 * Internal events.  Posted when a descriptor is readable or
+	 * writable.  These are statically allocated and never freed.
+	 * They will be set to non-purgable before use.
+	 */
+	intev_t			readable_ev;
+	intev_t			writable_ev;
+
+	isc_sockaddr_t		peer_address;       /* remote address */
+
+	unsigned int		pending_recv : 1,
+				pending_send : 1,
+				pending_accept : 1,
+				listener : 1,       /* listener socket */
+				connected : 1,
+				connecting : 1,     /* connect pending */
+				bound : 1,          /* bound to local addr */
+				dupped : 1,
+				active : 1,         /* currently active */
+				pktdscp : 1;	    /* per packet dscp */
+
+#ifdef ISC_PLATFORM_RECVOVERFLOW
+	unsigned char		overflow; /* used for MSG_TRUNC fake */
+#endif
+
+	void			*fdwatcharg;
+	isc_sockfdwatch_t	fdwatchcb;
+	int			fdwatchflags;
+	isc_task_t		*fdwatchtask;
+	unsigned int		dscp;
+};
+
+#define SOCKET_MANAGER_MAGIC	ISC_MAGIC('I', 'O', 'm', 'g')
+#define VALID_MANAGER(m)	ISC_MAGIC_VALID(m, SOCKET_MANAGER_MAGIC)
+
+struct isc__socketmgr {
+	/* Not locked. */
+	isc_socketmgr_t		common;
+	isc_mem_t	       *mctx;
+	isc_mutex_t		lock;
+	isc_mutex_t		*fdlock;
+	isc_stats_t		*stats;
+#ifdef USE_KQUEUE
+	int			kqueue_fd;
+	int			nevents;
+	struct kevent		*events;
+#endif	/* USE_KQUEUE */
+#ifdef USE_EPOLL
+	int			epoll_fd;
+	int			nevents;
+	struct epoll_event	*events;
+#endif	/* USE_EPOLL */
+#ifdef USE_DEVPOLL
+	int			devpoll_fd;
+	isc_resourcevalue_t	open_max;
+	unsigned int		calls;
+	int			nevents;
+	struct pollfd		*events;
+#endif	/* USE_DEVPOLL */
+#ifdef USE_SELECT
+	int			fd_bufsize;
+#endif	/* USE_SELECT */
+	unsigned int		maxsocks;
+#ifdef ISC_PLATFORM_USETHREADS
+	int			pipe_fds[2];
+#endif
+
+	/* Locked by fdlock. */
+	isc__socket_t	       **fds;
+	int			*fdstate;
+#if defined(USE_EPOLL)
+	uint32_t		*epoll_events;
+#endif
+#ifdef USE_DEVPOLL
+	pollinfo_t		*fdpollinfo;
+#endif
+
+	/* Locked by manager lock. */
+	ISC_LIST(isc__socket_t)	socklist;
+#ifdef USE_SELECT
+	fd_set			*read_fds;
+	fd_set			*read_fds_copy;
+	fd_set			*write_fds;
+	fd_set			*write_fds_copy;
+	int			maxfd;
+#endif	/* USE_SELECT */
+	int			reserved;	/* unlocked */
+#ifdef USE_WATCHER_THREAD
+	isc_thread_t		watcher;
+	isc_condition_t		shutdown_ok;
+#else /* USE_WATCHER_THREAD */
+	unsigned int		refs;
+#endif /* USE_WATCHER_THREAD */
+	int			maxudp;
+};
+
+#ifdef USE_SHARED_MANAGER
+static isc__socketmgr_t *socketmgr = NULL;
+#endif /* USE_SHARED_MANAGER */
+
+#define CLOSED			0	/* this one must be zero */
+#define MANAGED			1
+#define CLOSE_PENDING		2
+
+/*
+ * send() and recv() iovec counts
+ */
+#define MAXSCATTERGATHER_SEND	(ISC_SOCKET_MAXSCATTERGATHER)
+#ifdef ISC_PLATFORM_RECVOVERFLOW
+# define MAXSCATTERGATHER_RECV	(ISC_SOCKET_MAXSCATTERGATHER + 1)
+#else
+# define MAXSCATTERGATHER_RECV	(ISC_SOCKET_MAXSCATTERGATHER)
+#endif
+
+static isc_result_t socket_create(isc_socketmgr_t *manager0, int pf,
+				  isc_sockettype_t type,
+				  isc_socket_t **socketp,
+				  isc_socket_t *dup_socket);
+static void send_recvdone_event(isc__socket_t *, isc_socketevent_t **);
+static void send_senddone_event(isc__socket_t *, isc_socketevent_t **);
+static void send_connectdone_event(isc__socket_t *, isc_socket_connev_t **);
+static void free_socket(isc__socket_t **);
+static isc_result_t allocate_socket(isc__socketmgr_t *, isc_sockettype_t,
+				    isc__socket_t **);
+static void destroy(isc__socket_t **);
+static void internal_accept(isc_task_t *, isc_event_t *);
+static void internal_connect(isc_task_t *, isc_event_t *);
+static void internal_recv(isc_task_t *, isc_event_t *);
+static void internal_send(isc_task_t *, isc_event_t *);
+static void internal_fdwatch_write(isc_task_t *, isc_event_t *);
+static void internal_fdwatch_read(isc_task_t *, isc_event_t *);
+static void process_cmsg(isc__socket_t *, struct msghdr *, isc_socketevent_t *);
+static void build_msghdr_send(isc__socket_t *, char *, isc_socketevent_t *,
+			      struct msghdr *, struct iovec *, size_t *);
+static void build_msghdr_recv(isc__socket_t *, char *, isc_socketevent_t *,
+			      struct msghdr *, struct iovec *, size_t *);
+#ifdef USE_WATCHER_THREAD
+static bool process_ctlfd(isc__socketmgr_t *manager);
+#endif
+static void setdscp(isc__socket_t *sock, isc_dscp_t dscp);
+
+/*%
+ * The following are intended for internal use (indicated by "isc__"
+ * prefix) but are not declared as static, allowing direct access from
+ * unit tests etc.
+ */
+
+isc_result_t
+isc__socket_open(isc_socket_t *sock0);
+isc_result_t
+isc__socket_close(isc_socket_t *sock0);
+isc_result_t
+isc__socket_create(isc_socketmgr_t *manager, int pf, isc_sockettype_t type,
+		   isc_socket_t **socketp);
+void
+isc__socket_attach(isc_socket_t *sock, isc_socket_t **socketp);
+void
+isc__socket_detach(isc_socket_t **socketp);
+isc_result_t
+isc__socket_recvv(isc_socket_t *sock, isc_bufferlist_t *buflist,
+		 unsigned int minimum, isc_task_t *task,
+		  isc_taskaction_t action, void *arg);
+isc_result_t
+isc__socket_recv(isc_socket_t *sock, isc_region_t *region,
+		 unsigned int minimum, isc_task_t *task,
+		 isc_taskaction_t action, void *arg);
+isc_result_t
+isc__socket_recv2(isc_socket_t *sock, isc_region_t *region,
+		  unsigned int minimum, isc_task_t *task,
+		  isc_socketevent_t *event, unsigned int flags);
+isc_result_t
+isc__socket_send(isc_socket_t *sock, isc_region_t *region,
+		 isc_task_t *task, isc_taskaction_t action, void *arg);
+isc_result_t
+isc__socket_sendto(isc_socket_t *sock, isc_region_t *region,
+		   isc_task_t *task, isc_taskaction_t action, void *arg,
+		   isc_sockaddr_t *address, struct in6_pktinfo *pktinfo);
+isc_result_t
+isc__socket_sendv(isc_socket_t *sock, isc_bufferlist_t *buflist,
+		  isc_task_t *task, isc_taskaction_t action, void *arg);
+isc_result_t
+isc__socket_sendtov(isc_socket_t *sock, isc_bufferlist_t *buflist,
+		    isc_task_t *task, isc_taskaction_t action, void *arg,
+		    isc_sockaddr_t *address, struct in6_pktinfo *pktinfo);
+isc_result_t
+isc__socket_sendtov2(isc_socket_t *sock, isc_bufferlist_t *buflist,
+		     isc_task_t *task, isc_taskaction_t action, void *arg,
+		     isc_sockaddr_t *address, struct in6_pktinfo *pktinfo,
+		     unsigned int flags);
+isc_result_t
+isc__socket_sendto2(isc_socket_t *sock, isc_region_t *region,
+		    isc_task_t *task,
+		    isc_sockaddr_t *address, struct in6_pktinfo *pktinfo,
+		    isc_socketevent_t *event, unsigned int flags);
+isc_socketevent_t *
+isc_socket_socketevent(isc_mem_t *mctx, void *sender,
+		       isc_eventtype_t eventtype, isc_taskaction_t action,
+		       void *arg);
+
+void
+isc__socket_cleanunix(isc_sockaddr_t *sockaddr, bool active);
+isc_result_t
+isc__socket_permunix(isc_sockaddr_t *sockaddr, uint32_t perm,
+		     uint32_t owner, uint32_t group);
+isc_result_t
+isc__socket_bind(isc_socket_t *sock, isc_sockaddr_t *sockaddr,
+		 unsigned int options);
+isc_result_t
+isc__socket_filter(isc_socket_t *sock, const char *filter);
+isc_result_t
+isc__socket_listen(isc_socket_t *sock, unsigned int backlog);
+isc_result_t
+isc__socket_accept(isc_socket_t *sock,
+		   isc_task_t *task, isc_taskaction_t action, void *arg);
+isc_result_t
+isc__socket_connect(isc_socket_t *sock, isc_sockaddr_t *addr,
+		    isc_task_t *task, isc_taskaction_t action,
+		    void *arg);
+isc_result_t
+isc__socket_getpeername(isc_socket_t *sock, isc_sockaddr_t *addressp);
+isc_result_t
+isc__socket_getsockname(isc_socket_t *sock, isc_sockaddr_t *addressp);
+void
+isc__socket_cancel(isc_socket_t *sock, isc_task_t *task, unsigned int how);
+isc_sockettype_t
+isc__socket_gettype(isc_socket_t *sock);
+bool
+isc__socket_isbound(isc_socket_t *sock);
+void
+isc__socket_ipv6only(isc_socket_t *sock, bool yes);
+void
+isc__socket_dscp(isc_socket_t *sock, isc_dscp_t dscp);
+isc_result_t
+isc__socket_fdwatchcreate(isc_socketmgr_t *manager, int fd, int flags,
+			  isc_sockfdwatch_t callback, void *cbarg,
+			  isc_task_t *task, isc_socket_t **socketp);
+isc_result_t
+isc__socket_fdwatchpoke(isc_socket_t *sock, int flags);
+isc_result_t
+isc__socket_dup(isc_socket_t *sock, isc_socket_t **socketp);
+int
+isc__socket_getfd(isc_socket_t *sock);
+
+isc_result_t
+isc__socketmgr_create(isc_mem_t *mctx, isc_socketmgr_t **managerp);
+isc_result_t
+isc__socketmgr_create2(isc_mem_t *mctx, isc_socketmgr_t **managerp,
+		       unsigned int maxsocks);
+isc_result_t
+isc_socketmgr_getmaxsockets(isc_socketmgr_t *manager0, unsigned int *nsockp);
+void
+isc_socketmgr_setstats(isc_socketmgr_t *manager0, isc_stats_t *stats);
+void
+isc__socketmgr_destroy(isc_socketmgr_t **managerp);
+void
+isc__socket_setname(isc_socket_t *socket0, const char *name, void *tag);
+const char *
+isc__socket_getname(isc_socket_t *socket0);
+void *
+isc__socket_gettag(isc_socket_t *socket0);
+
+#ifdef HAVE_LIBXML2
+void
+isc__socketmgr_renderxml(isc_socketmgr_t *mgr0, xmlTextWriterPtr writer);
+#endif
+#ifdef HAVE_JSON
+isc_result_t
+isc__socketmgr_renderjson(isc_socketmgr_t *mgr0, json_object *stats);
+#endif
+
+static struct {
+	isc_socketmethods_t methods;
+
+	/*%
+	 * The following are defined just for avoiding unused static functions.
+	 */
+	void *recvv, *send, *sendv, *sendto2, *cleanunix, *permunix, *filter,
+	     *listen, *accept, *getpeername, *isbound;
+} socketmethods = {
+	{
+		isc__socket_attach,
+		isc__socket_detach,
+		isc__socket_bind,
+		isc__socket_sendto,
+		isc__socket_sendto2,
+		isc__socket_connect,
+		isc__socket_recv,
+		isc__socket_recv2,
+		isc__socket_cancel,
+		isc__socket_getsockname,
+		isc__socket_gettype,
+		isc__socket_ipv6only,
+		isc__socket_fdwatchpoke,
+		isc__socket_dup,
+		isc__socket_getfd,
+		isc__socket_dscp
+	},
+	(void *)isc__socket_recvv, (void *)isc__socket_send,
+	(void *)isc__socket_sendv, (void *)isc__socket_sendto2,
+	(void *)isc__socket_cleanunix, (void *)isc__socket_permunix,
+	(void *)isc__socket_filter, (void *)isc__socket_listen,
+	(void *)isc__socket_accept, (void *)isc__socket_getpeername,
+	(void *)isc__socket_isbound
+};
+
+static isc_socketmgrmethods_t socketmgrmethods = {
+	isc__socketmgr_destroy,
+	isc__socket_create,
+	isc__socket_fdwatchcreate
+};
+
+#define SELECT_POKE_SHUTDOWN		(-1)
+#define SELECT_POKE_NOTHING		(-2)
+#define SELECT_POKE_READ		(-3)
+#define SELECT_POKE_ACCEPT		(-3) /*%< Same as _READ */
+#define SELECT_POKE_WRITE		(-4)
+#define SELECT_POKE_CONNECT		(-4) /*%< Same as _WRITE */
+#define SELECT_POKE_CLOSE		(-5)
+
+#define SOCK_DEAD(s)			((s)->references == 0)
+
+/*%
+ * Shortcut index arrays to get access to statistics counters.
+ */
+enum {
+	STATID_OPEN = 0,
+	STATID_OPENFAIL = 1,
+	STATID_CLOSE = 2,
+	STATID_BINDFAIL = 3,
+	STATID_CONNECTFAIL = 4,
+	STATID_CONNECT = 5,
+	STATID_ACCEPTFAIL = 6,
+	STATID_ACCEPT = 7,
+	STATID_SENDFAIL = 8,
+	STATID_RECVFAIL = 9,
+	STATID_ACTIVE = 10
+};
+static const isc_statscounter_t udp4statsindex[] = {
+	isc_sockstatscounter_udp4open,
+	isc_sockstatscounter_udp4openfail,
+	isc_sockstatscounter_udp4close,
+	isc_sockstatscounter_udp4bindfail,
+	isc_sockstatscounter_udp4connectfail,
+	isc_sockstatscounter_udp4connect,
+	-1,
+	-1,
+	isc_sockstatscounter_udp4sendfail,
+	isc_sockstatscounter_udp4recvfail,
+	isc_sockstatscounter_udp4active
+};
+static const isc_statscounter_t udp6statsindex[] = {
+	isc_sockstatscounter_udp6open,
+	isc_sockstatscounter_udp6openfail,
+	isc_sockstatscounter_udp6close,
+	isc_sockstatscounter_udp6bindfail,
+	isc_sockstatscounter_udp6connectfail,
+	isc_sockstatscounter_udp6connect,
+	-1,
+	-1,
+	isc_sockstatscounter_udp6sendfail,
+	isc_sockstatscounter_udp6recvfail,
+	isc_sockstatscounter_udp6active
+};
+static const isc_statscounter_t tcp4statsindex[] = {
+	isc_sockstatscounter_tcp4open,
+	isc_sockstatscounter_tcp4openfail,
+	isc_sockstatscounter_tcp4close,
+	isc_sockstatscounter_tcp4bindfail,
+	isc_sockstatscounter_tcp4connectfail,
+	isc_sockstatscounter_tcp4connect,
+	isc_sockstatscounter_tcp4acceptfail,
+	isc_sockstatscounter_tcp4accept,
+	isc_sockstatscounter_tcp4sendfail,
+	isc_sockstatscounter_tcp4recvfail,
+	isc_sockstatscounter_tcp4active
+};
+static const isc_statscounter_t tcp6statsindex[] = {
+	isc_sockstatscounter_tcp6open,
+	isc_sockstatscounter_tcp6openfail,
+	isc_sockstatscounter_tcp6close,
+	isc_sockstatscounter_tcp6bindfail,
+	isc_sockstatscounter_tcp6connectfail,
+	isc_sockstatscounter_tcp6connect,
+	isc_sockstatscounter_tcp6acceptfail,
+	isc_sockstatscounter_tcp6accept,
+	isc_sockstatscounter_tcp6sendfail,
+	isc_sockstatscounter_tcp6recvfail,
+	isc_sockstatscounter_tcp6active
+};
+static const isc_statscounter_t unixstatsindex[] = {
+	isc_sockstatscounter_unixopen,
+	isc_sockstatscounter_unixopenfail,
+	isc_sockstatscounter_unixclose,
+	isc_sockstatscounter_unixbindfail,
+	isc_sockstatscounter_unixconnectfail,
+	isc_sockstatscounter_unixconnect,
+	isc_sockstatscounter_unixacceptfail,
+	isc_sockstatscounter_unixaccept,
+	isc_sockstatscounter_unixsendfail,
+	isc_sockstatscounter_unixrecvfail,
+	isc_sockstatscounter_unixactive
+};
+static const isc_statscounter_t fdwatchstatsindex[] = {
+	-1,
+	-1,
+	isc_sockstatscounter_fdwatchclose,
+	isc_sockstatscounter_fdwatchbindfail,
+	isc_sockstatscounter_fdwatchconnectfail,
+	isc_sockstatscounter_fdwatchconnect,
+	-1,
+	-1,
+	isc_sockstatscounter_fdwatchsendfail,
+	isc_sockstatscounter_fdwatchrecvfail,
+	-1
+};
+static const isc_statscounter_t rawstatsindex[] = {
+	isc_sockstatscounter_rawopen,
+	isc_sockstatscounter_rawopenfail,
+	isc_sockstatscounter_rawclose,
+	-1,
+	-1,
+	-1,
+	-1,
+	-1,
+	-1,
+	isc_sockstatscounter_rawrecvfail,
+	isc_sockstatscounter_rawactive
+};
+
+#if defined(USE_KQUEUE) || defined(USE_EPOLL) || defined(USE_DEVPOLL) || \
+    defined(USE_WATCHER_THREAD)
+static void
+manager_log(isc__socketmgr_t *sockmgr,
+	    isc_logcategory_t *category, isc_logmodule_t *module, int level,
+	    const char *fmt, ...) ISC_FORMAT_PRINTF(5, 6);
+static void
+manager_log(isc__socketmgr_t *sockmgr,
+	    isc_logcategory_t *category, isc_logmodule_t *module, int level,
+	    const char *fmt, ...)
+{
+	char msgbuf[2048];
+	va_list ap;
+
+	if (! isc_log_wouldlog(isc_lctx, level))
+		return;
+
+	va_start(ap, fmt);
+	vsnprintf(msgbuf, sizeof(msgbuf), fmt, ap);
+	va_end(ap);
+
+	isc_log_write(isc_lctx, category, module, level,
+		      "sockmgr %p: %s", sockmgr, msgbuf);
+}
+#endif
+
+static void
+socket_log(isc__socket_t *sock, isc_sockaddr_t *address,
+	   isc_logcategory_t *category, isc_logmodule_t *module, int level,
+	   isc_msgcat_t *msgcat, int msgset, int message,
+	   const char *fmt, ...) ISC_FORMAT_PRINTF(9, 10);
+static void
+socket_log(isc__socket_t *sock, isc_sockaddr_t *address,
+	   isc_logcategory_t *category, isc_logmodule_t *module, int level,
+	   isc_msgcat_t *msgcat, int msgset, int message,
+	   const char *fmt, ...)
+{
+	char msgbuf[2048];
+	char peerbuf[ISC_SOCKADDR_FORMATSIZE];
+	va_list ap;
+
+	if (! isc_log_wouldlog(isc_lctx, level))
+		return;
+
+	va_start(ap, fmt);
+	vsnprintf(msgbuf, sizeof(msgbuf), fmt, ap);
+	va_end(ap);
+
+	if (address == NULL) {
+		isc_log_iwrite(isc_lctx, category, module, level,
+			       msgcat, msgset, message,
+			       "socket %p: %s", sock, msgbuf);
+	} else {
+		isc_sockaddr_format(address, peerbuf, sizeof(peerbuf));
+		isc_log_iwrite(isc_lctx, category, module, level,
+			       msgcat, msgset, message,
+			       "socket %p %s: %s", sock, peerbuf, msgbuf);
+	}
+}
+
+#if defined(_AIX) && defined(ISC_NET_BSD44MSGHDR) && \
+    defined(USE_CMSG) && defined(IPV6_RECVPKTINFO)
+/*
+ * AIX has a kernel bug where IPV6_RECVPKTINFO gets cleared by
+ * setting IPV6_V6ONLY.
+ */
+static void
+FIX_IPV6_RECVPKTINFO(isc__socket_t *sock)
+{
+	char strbuf[ISC_STRERRORSIZE];
+	int on = 1;
+
+	if (sock->pf != AF_INET6 || sock->type != isc_sockettype_udp)
+		return;
+
+	if (setsockopt(sock->fd, IPPROTO_IPV6, IPV6_RECVPKTINFO,
+		       (void *)&on, sizeof(on)) < 0) {
+
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 "setsockopt(%d, IPV6_RECVPKTINFO) "
+				 "%s: %s", sock->fd,
+				 isc_msgcat_get(isc_msgcat,
+						ISC_MSGSET_GENERAL,
+						ISC_MSG_FAILED,
+						"failed"),
+				 strbuf);
+	}
+}
+#else
+#define FIX_IPV6_RECVPKTINFO(sock) (void)0
+#endif
+
+/*%
+ * Increment socket-related statistics counters.
+ */
+static inline void
+inc_stats(isc_stats_t *stats, isc_statscounter_t counterid) {
+	REQUIRE(counterid != -1);
+
+	if (stats != NULL)
+		isc_stats_increment(stats, counterid);
+}
+
+/*%
+ * Decrement socket-related statistics counters.
+ */
+static inline void
+dec_stats(isc_stats_t *stats, isc_statscounter_t counterid) {
+	REQUIRE(counterid != -1);
+
+	if (stats != NULL)
+		isc_stats_decrement(stats, counterid);
+}
+
+static inline isc_result_t
+watch_fd(isc__socketmgr_t *manager, int fd, int msg) {
+	isc_result_t result = ISC_R_SUCCESS;
+
+#ifdef USE_KQUEUE
+	struct kevent evchange;
+
+	memset(&evchange, 0, sizeof(evchange));
+	if (msg == SELECT_POKE_READ)
+		evchange.filter = EVFILT_READ;
+	else
+		evchange.filter = EVFILT_WRITE;
+	evchange.flags = EV_ADD;
+	evchange.ident = fd;
+	if (kevent(manager->kqueue_fd, &evchange, 1, NULL, 0, NULL) != 0)
+		result = isc__errno2result(errno);
+
+	return (result);
+#elif defined(USE_EPOLL)
+	struct epoll_event event;
+	uint32_t oldevents;
+	int ret;
+	int op;
+
+	oldevents = manager->epoll_events[fd];
+	if (msg == SELECT_POKE_READ)
+		manager->epoll_events[fd] |= EPOLLIN;
+	else
+		manager->epoll_events[fd] |= EPOLLOUT;
+
+	event.events = manager->epoll_events[fd];
+	memset(&event.data, 0, sizeof(event.data));
+	event.data.fd = fd;
+
+	op = (oldevents == 0U) ? EPOLL_CTL_ADD : EPOLL_CTL_MOD;
+	ret = epoll_ctl(manager->epoll_fd, op, fd, &event);
+	if (ret == -1) {
+		if (errno == EEXIST)
+			UNEXPECTED_ERROR(__FILE__, __LINE__,
+					 "epoll_ctl(ADD/MOD) returned "
+					 "EEXIST for fd %d", fd);
+		result = isc__errno2result(errno);
+	}
+
+	return (result);
+#elif defined(USE_DEVPOLL)
+	struct pollfd pfd;
+	int lockid = FDLOCK_ID(fd);
+
+	memset(&pfd, 0, sizeof(pfd));
+	if (msg == SELECT_POKE_READ)
+		pfd.events = POLLIN;
+	else
+		pfd.events = POLLOUT;
+	pfd.fd = fd;
+	pfd.revents = 0;
+	LOCK(&manager->fdlock[lockid]);
+	if (write(manager->devpoll_fd, &pfd, sizeof(pfd)) == -1)
+		result = isc__errno2result(errno);
+	else {
+		if (msg == SELECT_POKE_READ)
+			manager->fdpollinfo[fd].want_read = 1;
+		else
+			manager->fdpollinfo[fd].want_write = 1;
+	}
+	UNLOCK(&manager->fdlock[lockid]);
+
+	return (result);
+#elif defined(USE_SELECT)
+	LOCK(&manager->lock);
+	if (msg == SELECT_POKE_READ)
+		FD_SET(fd, manager->read_fds);
+	if (msg == SELECT_POKE_WRITE)
+		FD_SET(fd, manager->write_fds);
+	UNLOCK(&manager->lock);
+
+	return (result);
+#endif
+}
+
+static inline isc_result_t
+unwatch_fd(isc__socketmgr_t *manager, int fd, int msg) {
+	isc_result_t result = ISC_R_SUCCESS;
+
+#ifdef USE_KQUEUE
+	struct kevent evchange;
+
+	memset(&evchange, 0, sizeof(evchange));
+	if (msg == SELECT_POKE_READ)
+		evchange.filter = EVFILT_READ;
+	else
+		evchange.filter = EVFILT_WRITE;
+	evchange.flags = EV_DELETE;
+	evchange.ident = fd;
+	if (kevent(manager->kqueue_fd, &evchange, 1, NULL, 0, NULL) != 0)
+		result = isc__errno2result(errno);
+
+	return (result);
+#elif defined(USE_EPOLL)
+	struct epoll_event event;
+	int ret;
+	int op;
+
+	if (msg == SELECT_POKE_READ)
+		manager->epoll_events[fd] &= ~(EPOLLIN);
+	else
+		manager->epoll_events[fd] &= ~(EPOLLOUT);
+
+	event.events = manager->epoll_events[fd];
+	memset(&event.data, 0, sizeof(event.data));
+	event.data.fd = fd;
+
+	op = (event.events == 0U) ? EPOLL_CTL_DEL : EPOLL_CTL_MOD;
+	ret = epoll_ctl(manager->epoll_fd, op, fd, &event);
+	if (ret == -1 && errno != ENOENT) {
+		char strbuf[ISC_STRERRORSIZE];
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 "epoll_ctl(DEL), %d: %s", fd, strbuf);
+		result = ISC_R_UNEXPECTED;
+	}
+	return (result);
+#elif defined(USE_DEVPOLL)
+	struct pollfd pfds[2];
+	size_t writelen = sizeof(pfds[0]);
+	int lockid = FDLOCK_ID(fd);
+
+	memset(pfds, 0, sizeof(pfds));
+	pfds[0].events = POLLREMOVE;
+	pfds[0].fd = fd;
+
+	/*
+	 * Canceling read or write polling via /dev/poll is tricky.  Since it
+	 * only provides a way of canceling per FD, we may need to re-poll the
+	 * socket for the other operation.
+	 */
+	LOCK(&manager->fdlock[lockid]);
+	if (msg == SELECT_POKE_READ &&
+	    manager->fdpollinfo[fd].want_write == 1) {
+		pfds[1].events = POLLOUT;
+		pfds[1].fd = fd;
+		writelen += sizeof(pfds[1]);
+	}
+	if (msg == SELECT_POKE_WRITE &&
+	    manager->fdpollinfo[fd].want_read == 1) {
+		pfds[1].events = POLLIN;
+		pfds[1].fd = fd;
+		writelen += sizeof(pfds[1]);
+	}
+
+	if (write(manager->devpoll_fd, pfds, writelen) == -1)
+		result = isc__errno2result(errno);
+	else {
+		if (msg == SELECT_POKE_READ)
+			manager->fdpollinfo[fd].want_read = 0;
+		else
+			manager->fdpollinfo[fd].want_write = 0;
+	}
+	UNLOCK(&manager->fdlock[lockid]);
+
+	return (result);
+#elif defined(USE_SELECT)
+	LOCK(&manager->lock);
+	if (msg == SELECT_POKE_READ)
+		FD_CLR(fd, manager->read_fds);
+	else if (msg == SELECT_POKE_WRITE)
+		FD_CLR(fd, manager->write_fds);
+	UNLOCK(&manager->lock);
+
+	return (result);
+#endif
+}
+
+static void
+wakeup_socket(isc__socketmgr_t *manager, int fd, int msg) {
+	isc_result_t result;
+	int lockid = FDLOCK_ID(fd);
+
+	/*
+	 * This is a wakeup on a socket.  If the socket is not in the
+	 * process of being closed, start watching it for either reads
+	 * or writes.
+	 */
+
+	INSIST(fd >= 0 && fd < (int)manager->maxsocks);
+
+	if (msg == SELECT_POKE_CLOSE) {
+		/* No one should be updating fdstate, so no need to lock it */
+		INSIST(manager->fdstate[fd] == CLOSE_PENDING);
+		manager->fdstate[fd] = CLOSED;
+		(void)unwatch_fd(manager, fd, SELECT_POKE_READ);
+		(void)unwatch_fd(manager, fd, SELECT_POKE_WRITE);
+		(void)close(fd);
+		return;
+	}
+
+	LOCK(&manager->fdlock[lockid]);
+	if (manager->fdstate[fd] == CLOSE_PENDING) {
+		UNLOCK(&manager->fdlock[lockid]);
+
+		/*
+		 * We accept (and ignore) any error from unwatch_fd() as we are
+		 * closing the socket, hoping it doesn't leave dangling state in
+		 * the kernel.
+		 * Note that unwatch_fd() must be called after releasing the
+		 * fdlock; otherwise it could cause deadlock due to a lock order
+		 * reversal.
+		 */
+		(void)unwatch_fd(manager, fd, SELECT_POKE_READ);
+		(void)unwatch_fd(manager, fd, SELECT_POKE_WRITE);
+		return;
+	}
+	if (manager->fdstate[fd] != MANAGED) {
+		UNLOCK(&manager->fdlock[lockid]);
+		return;
+	}
+	UNLOCK(&manager->fdlock[lockid]);
+
+	/*
+	 * Set requested bit.
+	 */
+	result = watch_fd(manager, fd, msg);
+	if (result != ISC_R_SUCCESS) {
+		/*
+		 * XXXJT: what should we do?  Ignoring the failure of watching
+		 * a socket will make the application dysfunctional, but there
+		 * seems to be no reasonable recovery process.
+		 */
+		isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+			      ISC_LOGMODULE_SOCKET, ISC_LOG_ERROR,
+			      "failed to start watching FD (%d): %s",
+			      fd, isc_result_totext(result));
+	}
+}
+
+#ifdef USE_WATCHER_THREAD
+/*
+ * Poke the select loop when there is something for us to do.
+ * The write is required (by POSIX) to complete.  That is, we
+ * will not get partial writes.
+ */
+static void
+select_poke(isc__socketmgr_t *mgr, int fd, int msg) {
+	int cc;
+	int buf[2];
+	char strbuf[ISC_STRERRORSIZE];
+
+	buf[0] = fd;
+	buf[1] = msg;
+
+	do {
+		cc = write(mgr->pipe_fds[1], buf, sizeof(buf));
+#ifdef ENOSR
+		/*
+		 * Treat ENOSR as EAGAIN but loop slowly as it is
+		 * unlikely to clear fast.
+		 */
+		if (cc < 0 && errno == ENOSR) {
+			sleep(1);
+			errno = EAGAIN;
+		}
+#endif
+	} while (cc < 0 && SOFT_ERROR(errno));
+
+	if (cc < 0) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		FATAL_ERROR(__FILE__, __LINE__,
+			    isc_msgcat_get(isc_msgcat, ISC_MSGSET_SOCKET,
+					   ISC_MSG_WRITEFAILED,
+					   "write() failed "
+					   "during watcher poke: %s"),
+			    strbuf);
+	}
+
+	INSIST(cc == sizeof(buf));
+}
+
+/*
+ * Read a message on the internal fd.
+ */
+static void
+select_readmsg(isc__socketmgr_t *mgr, int *fd, int *msg) {
+	int buf[2];
+	int cc;
+	char strbuf[ISC_STRERRORSIZE];
+
+	cc = read(mgr->pipe_fds[0], buf, sizeof(buf));
+	if (cc < 0) {
+		*msg = SELECT_POKE_NOTHING;
+		*fd = -1;	/* Silence compiler. */
+		if (SOFT_ERROR(errno))
+			return;
+
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		FATAL_ERROR(__FILE__, __LINE__,
+			    isc_msgcat_get(isc_msgcat, ISC_MSGSET_SOCKET,
+					   ISC_MSG_READFAILED,
+					   "read() failed "
+					   "during watcher poke: %s"),
+			    strbuf);
+	}
+	INSIST(cc == sizeof(buf));
+
+	*fd = buf[0];
+	*msg = buf[1];
+}
+#else /* USE_WATCHER_THREAD */
+/*
+ * Update the state of the socketmgr when something changes.
+ */
+static void
+select_poke(isc__socketmgr_t *manager, int fd, int msg) {
+	if (msg == SELECT_POKE_SHUTDOWN)
+		return;
+	else if (fd >= 0)
+		wakeup_socket(manager, fd, msg);
+	return;
+}
+#endif /* USE_WATCHER_THREAD */
+
+/*
+ * Make a fd non-blocking.
+ */
+static isc_result_t
+make_nonblock(int fd) {
+	int ret;
+	char strbuf[ISC_STRERRORSIZE];
+#ifdef USE_FIONBIO_IOCTL
+	int on = 1;
+#else
+	int flags;
+#endif
+
+#ifdef USE_FIONBIO_IOCTL
+	ret = ioctl(fd, FIONBIO, (char *)&on);
+#else
+	flags = fcntl(fd, F_GETFL, 0);
+	flags |= PORT_NONBLOCK;
+	ret = fcntl(fd, F_SETFL, flags);
+#endif
+
+	if (ret == -1) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+#ifdef USE_FIONBIO_IOCTL
+				 "ioctl(%d, FIONBIO, &on): %s", fd,
+#else
+				 "fcntl(%d, F_SETFL, %d): %s", fd, flags,
+#endif
+				 strbuf);
+
+		return (ISC_R_UNEXPECTED);
+	}
+
+	return (ISC_R_SUCCESS);
+}
+
+#ifdef USE_CMSG
+/*
+ * Not all OSes support advanced CMSG macros: CMSG_LEN and CMSG_SPACE.
+ * In order to ensure as much portability as possible, we provide wrapper
+ * functions of these macros.
+ * Note that cmsg_space() could run slow on OSes that do not have
+ * CMSG_SPACE.
+ */
+static inline ISC_SOCKADDR_LEN_T
+cmsg_len(ISC_SOCKADDR_LEN_T len) {
+#ifdef CMSG_LEN
+	return (CMSG_LEN(len));
+#else
+	ISC_SOCKADDR_LEN_T hdrlen;
+
+	/*
+	 * Cast NULL so that any pointer arithmetic performed by CMSG_DATA
+	 * is correct.
+	 */
+	hdrlen = (ISC_SOCKADDR_LEN_T)CMSG_DATA(((struct cmsghdr *)NULL));
+	return (hdrlen + len);
+#endif
+}
+
+static inline ISC_SOCKADDR_LEN_T
+cmsg_space(ISC_SOCKADDR_LEN_T len) {
+#ifdef CMSG_SPACE
+	return (CMSG_SPACE(len));
+#else
+	struct msghdr msg;
+	struct cmsghdr *cmsgp;
+	/*
+	 * XXX: The buffer length is an ad-hoc value, but should be enough
+	 * in a practical sense.
+	 */
+	char dummybuf[sizeof(struct cmsghdr) + 1024];
+
+	memset(&msg, 0, sizeof(msg));
+	msg.msg_control = dummybuf;
+	msg.msg_controllen = sizeof(dummybuf);
+
+	cmsgp = (struct cmsghdr *)dummybuf;
+	cmsgp->cmsg_len = cmsg_len(len);
+
+	cmsgp = CMSG_NXTHDR(&msg, cmsgp);
+	if (cmsgp != NULL)
+		return ((char *)cmsgp - (char *)msg.msg_control);
+	else
+		return (0);
+#endif
+}
+#endif /* USE_CMSG */
+
+/*
+ * Process control messages received on a socket.
+ */
+static void
+process_cmsg(isc__socket_t *sock, struct msghdr *msg, isc_socketevent_t *dev) {
+#ifdef ISC_NET_BSD44MSGHDR
+#ifdef USE_CMSG
+	struct cmsghdr *cmsgp;
+#ifdef ISC_PLATFORM_HAVEIN6PKTINFO
+	struct in6_pktinfo *pktinfop;
+#endif
+#ifdef SO_TIMESTAMP
+	void *timevalp;
+#endif
+#endif
+#endif
+
+	/*
+	 * sock is used only when ISC_NET_BSD44MSGHDR and USE_CMSG are defined.
+	 * msg and dev are used only when ISC_NET_BSD44MSGHDR is defined.
+	 * They are all here, outside of the CPP tests, because it is
+	 * more consistent with the usual ISC coding style.
+	 */
+	UNUSED(sock);
+	UNUSED(msg);
+	UNUSED(dev);
+
+#ifdef ISC_NET_BSD44MSGHDR
+
+#ifdef MSG_TRUNC
+	if ((msg->msg_flags & MSG_TRUNC) == MSG_TRUNC)
+		dev->attributes |= ISC_SOCKEVENTATTR_TRUNC;
+#endif
+
+#ifdef MSG_CTRUNC
+	if ((msg->msg_flags & MSG_CTRUNC) == MSG_CTRUNC)
+		dev->attributes |= ISC_SOCKEVENTATTR_CTRUNC;
+#endif
+
+#ifndef USE_CMSG
+	return;
+#else
+	if (msg->msg_controllen == 0U || msg->msg_control == NULL)
+		return;
+
+#ifdef SO_TIMESTAMP
+	timevalp = NULL;
+#endif
+#ifdef ISC_PLATFORM_HAVEIN6PKTINFO
+	pktinfop = NULL;
+#endif
+
+	cmsgp = CMSG_FIRSTHDR(msg);
+	while (cmsgp != NULL) {
+		socket_log(sock, NULL, TRACE,
+			   isc_msgcat, ISC_MSGSET_SOCKET, ISC_MSG_PROCESSCMSG,
+			   "processing cmsg %p", cmsgp);
+
+#ifdef ISC_PLATFORM_HAVEIN6PKTINFO
+		if (cmsgp->cmsg_level == IPPROTO_IPV6
+		    && cmsgp->cmsg_type == IPV6_PKTINFO) {
+
+			pktinfop = (struct in6_pktinfo *)CMSG_DATA(cmsgp);
+			memmove(&dev->pktinfo, pktinfop,
+				sizeof(struct in6_pktinfo));
+			dev->attributes |= ISC_SOCKEVENTATTR_PKTINFO;
+			socket_log(sock, NULL, TRACE,
+				   isc_msgcat, ISC_MSGSET_SOCKET,
+				   ISC_MSG_IFRECEIVED,
+				   "interface received on ifindex %u",
+				   dev->pktinfo.ipi6_ifindex);
+			if (IN6_IS_ADDR_MULTICAST(&pktinfop->ipi6_addr))
+				dev->attributes |= ISC_SOCKEVENTATTR_MULTICAST;
+			goto next;
+		}
+#endif
+
+#ifdef SO_TIMESTAMP
+		if (cmsgp->cmsg_level == SOL_SOCKET
+		    && cmsgp->cmsg_type == SCM_TIMESTAMP) {
+			struct timeval tv;
+			timevalp = CMSG_DATA(cmsgp);
+			memmove(&tv, timevalp, sizeof(tv));
+			dev->timestamp.seconds = tv.tv_sec;
+			dev->timestamp.nanoseconds = tv.tv_usec * 1000;
+			dev->attributes |= ISC_SOCKEVENTATTR_TIMESTAMP;
+			goto next;
+		}
+#endif
+
+#ifdef IPV6_TCLASS
+		if (cmsgp->cmsg_level == IPPROTO_IPV6
+		    && cmsgp->cmsg_type == IPV6_TCLASS) {
+			dev->dscp = *(int *)CMSG_DATA(cmsgp);
+			dev->dscp >>= 2;
+			dev->attributes |= ISC_SOCKEVENTATTR_DSCP;
+			goto next;
+		}
+#endif
+
+#ifdef IP_TOS
+		if (cmsgp->cmsg_level == IPPROTO_IP
+		    && (cmsgp->cmsg_type == IP_TOS
+#ifdef IP_RECVTOS
+			|| cmsgp->cmsg_type == IP_RECVTOS
+#endif
+			)) {
+			dev->dscp = (int) *(unsigned char *)CMSG_DATA(cmsgp);
+			dev->dscp >>= 2;
+			dev->attributes |= ISC_SOCKEVENTATTR_DSCP;
+			goto next;
+		}
+#endif
+	next:
+		cmsgp = CMSG_NXTHDR(msg, cmsgp);
+	}
+#endif /* USE_CMSG */
+
+#endif /* ISC_NET_BSD44MSGHDR */
+}
+
+/*
+ * Construct an iov array and attach it to the msghdr passed in.  This is
+ * the SEND constructor, which will use the used region of the buffer
+ * (if using a buffer list) or will use the internal region (if a single
+ * buffer I/O is requested).
+ *
+ * Nothing can be NULL, and the done event must list at least one buffer
+ * on the buffer linked list for this function to be meaningful.
+ *
+ * If write_countp != NULL, *write_countp will hold the number of bytes
+ * this transaction can send.
+ */
+static void
+build_msghdr_send(isc__socket_t *sock, char* cmsgbuf, isc_socketevent_t *dev,
+		  struct msghdr *msg, struct iovec *iov, size_t *write_countp)
+{
+	unsigned int iovcount;
+	isc_buffer_t *buffer;
+	isc_region_t used;
+	size_t write_count;
+	size_t skip_count;
+#ifdef ISC_NET_BSD44MSGHDR
+	struct cmsghdr *cmsgp;
+#endif
+
+	memset(msg, 0, sizeof(*msg));
+
+	if (!sock->connected) {
+		msg->msg_name = (void *)&dev->address.type.sa;
+		msg->msg_namelen = dev->address.length;
+	} else {
+		msg->msg_name = NULL;
+		msg->msg_namelen = 0;
+	}
+
+	buffer = ISC_LIST_HEAD(dev->bufferlist);
+	write_count = 0;
+	iovcount = 0;
+
+	/*
+	 * Single buffer I/O?  Skip what we've done so far in this region.
+	 */
+	if (buffer == NULL) {
+		write_count = dev->region.length - dev->n;
+		iov[0].iov_base = (void *)(dev->region.base + dev->n);
+		iov[0].iov_len = write_count;
+		iovcount = 1;
+
+		goto config;
+	}
+
+	/*
+	 * Multibuffer I/O.
+	 * Skip the data in the buffer list that we have already written.
+	 */
+	skip_count = dev->n;
+	while (buffer != NULL) {
+		REQUIRE(ISC_BUFFER_VALID(buffer));
+		if (skip_count < isc_buffer_usedlength(buffer))
+			break;
+		skip_count -= isc_buffer_usedlength(buffer);
+		buffer = ISC_LIST_NEXT(buffer, link);
+	}
+
+	while (buffer != NULL) {
+		INSIST(iovcount < MAXSCATTERGATHER_SEND);
+
+		isc_buffer_usedregion(buffer, &used);
+
+		if (used.length > 0) {
+			iov[iovcount].iov_base = (void *)(used.base
+							  + skip_count);
+			iov[iovcount].iov_len = used.length - skip_count;
+			write_count += (used.length - skip_count);
+			skip_count = 0;
+			iovcount++;
+		}
+		buffer = ISC_LIST_NEXT(buffer, link);
+	}
+
+	INSIST(skip_count == 0U);
+
+ config:
+	msg->msg_iov = iov;
+	msg->msg_iovlen = iovcount;
+
+#ifdef ISC_NET_BSD44MSGHDR
+	msg->msg_control = NULL;
+	msg->msg_controllen = 0;
+	msg->msg_flags = 0;
+#if defined(USE_CMSG)
+
+#if defined(ISC_PLATFORM_HAVEIN6PKTINFO)
+	if ((sock->type == isc_sockettype_udp) &&
+	    ((dev->attributes & ISC_SOCKEVENTATTR_PKTINFO) != 0))
+	{
+		struct in6_pktinfo *pktinfop;
+
+		socket_log(sock, NULL, TRACE,
+			   isc_msgcat, ISC_MSGSET_SOCKET, ISC_MSG_SENDTODATA,
+			   "sendto pktinfo data, ifindex %u",
+			   dev->pktinfo.ipi6_ifindex);
+
+		msg->msg_control = (void *)cmsgbuf;
+		msg->msg_controllen = cmsg_space(sizeof(struct in6_pktinfo));
+		INSIST(msg->msg_controllen <= SENDCMSGBUFLEN);
+
+		cmsgp = (struct cmsghdr *)cmsgbuf;
+		cmsgp->cmsg_level = IPPROTO_IPV6;
+		cmsgp->cmsg_type = IPV6_PKTINFO;
+		cmsgp->cmsg_len = cmsg_len(sizeof(struct in6_pktinfo));
+		pktinfop = (struct in6_pktinfo *)CMSG_DATA(cmsgp);
+		memmove(pktinfop, &dev->pktinfo, sizeof(struct in6_pktinfo));
+	}
+#endif
+
+#if defined(IPV6_USE_MIN_MTU)
+	if ((sock->type == isc_sockettype_udp) &&
+	    ((dev->attributes & ISC_SOCKEVENTATTR_USEMINMTU) != 0))
+	{
+		int use_min_mtu = 1;	/* -1, 0, 1 */
+
+		cmsgp = (struct cmsghdr *)(cmsgbuf +
+					   msg->msg_controllen);
+
+		msg->msg_control = (void *)cmsgbuf;
+		msg->msg_controllen += cmsg_space(sizeof(use_min_mtu));
+		INSIST(msg->msg_controllen <= SENDCMSGBUFLEN);
+
+		cmsgp->cmsg_level = IPPROTO_IPV6;
+		cmsgp->cmsg_type = IPV6_USE_MIN_MTU;
+		cmsgp->cmsg_len = cmsg_len(sizeof(use_min_mtu));
+		memmove(CMSG_DATA(cmsgp), &use_min_mtu, sizeof(use_min_mtu));
+	}
+#endif
+
+	if (isc_dscp_check_value > -1) {
+		if (sock->type == isc_sockettype_udp)
+			INSIST((int)dev->dscp == isc_dscp_check_value);
+		else if (sock->type == isc_sockettype_tcp)
+			INSIST((int)sock->dscp == isc_dscp_check_value);
+	}
+
+#if defined(IP_TOS) || (defined(IPPROTO_IPV6) && defined(IPV6_TCLASS))
+	if ((sock->type == isc_sockettype_udp) &&
+	    ((dev->attributes & ISC_SOCKEVENTATTR_DSCP) != 0))
+	{
+		int dscp = (dev->dscp << 2) & 0xff;
+
+		INSIST(dev->dscp < 0x40);
+
+#ifdef IP_TOS
+		if (sock->pf == AF_INET && sock->pktdscp) {
+			cmsgp = (struct cmsghdr *)(cmsgbuf +
+						   msg->msg_controllen);
+			msg->msg_control = (void *)cmsgbuf;
+			msg->msg_controllen += cmsg_space(sizeof(dscp));
+			INSIST(msg->msg_controllen <= SENDCMSGBUFLEN);
+
+			cmsgp->cmsg_level = IPPROTO_IP;
+			cmsgp->cmsg_type = IP_TOS;
+			cmsgp->cmsg_len = cmsg_len(sizeof(char));
+			*(unsigned char*)CMSG_DATA(cmsgp) = dscp;
+		} else if (sock->pf == AF_INET && sock->dscp != dev->dscp) {
+			if (setsockopt(sock->fd, IPPROTO_IP, IP_TOS,
+			       (void *)&dscp, sizeof(int)) < 0)
+			{
+				char strbuf[ISC_STRERRORSIZE];
+				isc__strerror(errno, strbuf, sizeof(strbuf));
+				UNEXPECTED_ERROR(__FILE__, __LINE__,
+						 "setsockopt(%d, IP_TOS, %.02x)"
+						 " %s: %s",
+						 sock->fd, dscp >> 2,
+						 isc_msgcat_get(isc_msgcat,
+							ISC_MSGSET_GENERAL,
+							ISC_MSG_FAILED,
+							"failed"),
+						 strbuf);
+			} else
+				sock->dscp = dscp;
+		}
+#endif
+#if defined(IPPROTO_IPV6) && defined(IPV6_TCLASS)
+		if (sock->pf == AF_INET6 && sock->pktdscp) {
+			cmsgp = (struct cmsghdr *)(cmsgbuf +
+						   msg->msg_controllen);
+			msg->msg_control = (void *)cmsgbuf;
+			msg->msg_controllen += cmsg_space(sizeof(dscp));
+			INSIST(msg->msg_controllen <= SENDCMSGBUFLEN);
+
+			cmsgp->cmsg_level = IPPROTO_IPV6;
+			cmsgp->cmsg_type = IPV6_TCLASS;
+			cmsgp->cmsg_len = cmsg_len(sizeof(dscp));
+			memmove(CMSG_DATA(cmsgp), &dscp, sizeof(dscp));
+		} else if (sock->pf == AF_INET6 && sock->dscp != dev->dscp) {
+			if (setsockopt(sock->fd, IPPROTO_IPV6, IPV6_TCLASS,
+				       (void *)&dscp, sizeof(int)) < 0) {
+				char strbuf[ISC_STRERRORSIZE];
+				isc__strerror(errno, strbuf, sizeof(strbuf));
+				UNEXPECTED_ERROR(__FILE__, __LINE__,
+						 "setsockopt(%d, IPV6_TCLASS, "
+						 "%.02x) %s: %s",
+						 sock->fd, dscp >> 2,
+						 isc_msgcat_get(isc_msgcat,
+							ISC_MSGSET_GENERAL,
+							ISC_MSG_FAILED,
+							"failed"),
+						 strbuf);
+			} else
+				sock->dscp = dscp;
+		}
+#endif
+		if (msg->msg_controllen != 0 &&
+		    msg->msg_controllen < SENDCMSGBUFLEN)
+		{
+			memset(cmsgbuf + msg->msg_controllen, 0,
+			       SENDCMSGBUFLEN - msg->msg_controllen);
+		}
+	}
+#endif
+#endif /* USE_CMSG */
+#else /* ISC_NET_BSD44MSGHDR */
+	msg->msg_accrights = NULL;
+	msg->msg_accrightslen = 0;
+#endif /* ISC_NET_BSD44MSGHDR */
+
+	if (write_countp != NULL)
+		*write_countp = write_count;
+}
+
+/*
+ * Construct an iov array and attach it to the msghdr passed in.  This is
+ * the RECV constructor, which will use the available region of the buffer
+ * (if using a buffer list) or will use the internal region (if a single
+ * buffer I/O is requested).
+ *
+ * Nothing can be NULL, and the done event must list at least one buffer
+ * on the buffer linked list for this function to be meaningful.
+ *
+ * If read_countp != NULL, *read_countp will hold the number of bytes
+ * this transaction can receive.
+ */
+static void
+build_msghdr_recv(isc__socket_t *sock, char *cmsgbuf, isc_socketevent_t *dev,
+		  struct msghdr *msg, struct iovec *iov, size_t *read_countp)
+{
+	unsigned int iovcount;
+	isc_buffer_t *buffer;
+	isc_region_t available;
+	size_t read_count;
+
+	memset(msg, 0, sizeof(struct msghdr));
+
+	if (sock->type == isc_sockettype_udp) {
+		memset(&dev->address, 0, sizeof(dev->address));
+#ifdef BROKEN_RECVMSG
+		if (sock->pf == AF_INET) {
+			msg->msg_name = (void *)&dev->address.type.sin;
+			msg->msg_namelen = sizeof(dev->address.type.sin6);
+		} else if (sock->pf == AF_INET6) {
+			msg->msg_name = (void *)&dev->address.type.sin6;
+			msg->msg_namelen = sizeof(dev->address.type.sin6);
+#ifdef ISC_PLATFORM_HAVESYSUNH
+		} else if (sock->pf == AF_UNIX) {
+			msg->msg_name = (void *)&dev->address.type.sunix;
+			msg->msg_namelen = sizeof(dev->address.type.sunix);
+#endif
+		} else {
+			msg->msg_name = (void *)&dev->address.type.sa;
+			msg->msg_namelen = sizeof(dev->address.type);
+		}
+#else
+		msg->msg_name = (void *)&dev->address.type.sa;
+		msg->msg_namelen = sizeof(dev->address.type);
+#endif
+	} else { /* TCP */
+		msg->msg_name = NULL;
+		msg->msg_namelen = 0;
+		dev->address = sock->peer_address;
+	}
+
+	buffer = ISC_LIST_HEAD(dev->bufferlist);
+	read_count = 0;
+
+	/*
+	 * Single buffer I/O?  Skip what we've done so far in this region.
+	 */
+	if (buffer == NULL) {
+		read_count = dev->region.length - dev->n;
+		iov[0].iov_base = (void *)(dev->region.base + dev->n);
+		iov[0].iov_len = read_count;
+		iovcount = 1;
+
+		goto config;
+	}
+
+	/*
+	 * Multibuffer I/O.
+	 * Skip empty buffers.
+	 */
+	while (buffer != NULL) {
+		REQUIRE(ISC_BUFFER_VALID(buffer));
+		if (isc_buffer_availablelength(buffer) != 0)
+			break;
+		buffer = ISC_LIST_NEXT(buffer, link);
+	}
+
+	iovcount = 0;
+	while (buffer != NULL) {
+		INSIST(iovcount < MAXSCATTERGATHER_RECV);
+
+		isc_buffer_availableregion(buffer, &available);
+
+		if (available.length > 0) {
+			iov[iovcount].iov_base = (void *)(available.base);
+			iov[iovcount].iov_len = available.length;
+			read_count += available.length;
+			iovcount++;
+		}
+		buffer = ISC_LIST_NEXT(buffer, link);
+	}
+
+ config:
+
+	/*
+	 * If needed, set up to receive that one extra byte.
+	 */
+#ifdef ISC_PLATFORM_RECVOVERFLOW
+	if (sock->type == isc_sockettype_udp) {
+		INSIST(iovcount < MAXSCATTERGATHER_RECV);
+		iov[iovcount].iov_base = (void *)(&sock->overflow);
+		iov[iovcount].iov_len = 1;
+		iovcount++;
+	}
+#endif
+
+	msg->msg_iov = iov;
+	msg->msg_iovlen = iovcount;
+
+#ifdef ISC_NET_BSD44MSGHDR
+#if defined(USE_CMSG)
+	msg->msg_control = cmsgbuf;
+	msg->msg_controllen = RECVCMSGBUFLEN;
+#else
+	msg->msg_control = NULL;
+	msg->msg_controllen = 0;
+#endif /* USE_CMSG */
+	msg->msg_flags = 0;
+#else /* ISC_NET_BSD44MSGHDR */
+	msg->msg_accrights = NULL;
+	msg->msg_accrightslen = 0;
+#endif /* ISC_NET_BSD44MSGHDR */
+
+	if (read_countp != NULL)
+		*read_countp = read_count;
+}
+
+static void
+set_dev_address(isc_sockaddr_t *address, isc__socket_t *sock,
+		isc_socketevent_t *dev)
+{
+	if (sock->type == isc_sockettype_udp) {
+		if (address != NULL)
+			dev->address = *address;
+		else
+			dev->address = sock->peer_address;
+	} else if (sock->type == isc_sockettype_tcp) {
+		INSIST(address == NULL);
+		dev->address = sock->peer_address;
+	}
+}
+
+static void
+destroy_socketevent(isc_event_t *event) {
+	isc_socketevent_t *ev = (isc_socketevent_t *)event;
+
+	INSIST(ISC_LIST_EMPTY(ev->bufferlist));
+
+	(ev->destroy)(event);
+}
+
+static isc_socketevent_t *
+allocate_socketevent(isc_mem_t *mctx, void *sender,
+		     isc_eventtype_t eventtype, isc_taskaction_t action,
+		     void *arg)
+{
+	isc_socketevent_t *ev;
+
+	ev = (isc_socketevent_t *)isc_event_allocate(mctx, sender,
+						     eventtype, action, arg,
+						     sizeof(*ev));
+
+	if (ev == NULL)
+		return (NULL);
+
+	ev->result = ISC_R_UNSET;
+	ISC_LINK_INIT(ev, ev_link);
+	ISC_LIST_INIT(ev->bufferlist);
+	ev->region.base = NULL;
+	ev->n = 0;
+	ev->offset = 0;
+	ev->attributes = 0;
+	ev->destroy = ev->ev_destroy;
+	ev->ev_destroy = destroy_socketevent;
+	ev->dscp = 0;
+
+	return (ev);
+}
+
+#if defined(ISC_SOCKET_DEBUG)
+static void
+dump_msg(struct msghdr *msg) {
+	unsigned int i;
+
+	printf("MSGHDR %p\n", msg);
+	printf("\tname %p, namelen %ld\n", msg->msg_name,
+	       (long) msg->msg_namelen);
+	printf("\tiov %p, iovlen %ld\n", msg->msg_iov,
+	       (long) msg->msg_iovlen);
+	for (i = 0; i < (unsigned int)msg->msg_iovlen; i++)
+		printf("\t\t%u\tbase %p, len %ld\n", i,
+		       msg->msg_iov[i].iov_base,
+		       (long) msg->msg_iov[i].iov_len);
+#ifdef ISC_NET_BSD44MSGHDR
+	printf("\tcontrol %p, controllen %ld\n", msg->msg_control,
+	       (long) msg->msg_controllen);
+#endif
+}
+#endif
+
+#define DOIO_SUCCESS		0	/* i/o ok, event sent */
+#define DOIO_SOFT		1	/* i/o ok, soft error, no event sent */
+#define DOIO_HARD		2	/* i/o error, event sent */
+#define DOIO_EOF		3	/* EOF, no event sent */
+
+static int
+doio_recv(isc__socket_t *sock, isc_socketevent_t *dev) {
+	int cc;
+	struct iovec iov[MAXSCATTERGATHER_RECV];
+	size_t read_count;
+	size_t actual_count;
+	struct msghdr msghdr;
+	isc_buffer_t *buffer;
+	int recv_errno;
+	char strbuf[ISC_STRERRORSIZE];
+	char cmsgbuf[RECVCMSGBUFLEN] = {0};
+
+	build_msghdr_recv(sock, cmsgbuf, dev, &msghdr, iov, &read_count);
+
+#if defined(ISC_SOCKET_DEBUG)
+	dump_msg(&msghdr);
+#endif
+
+	cc = recvmsg(sock->fd, &msghdr, 0);
+	recv_errno = errno;
+
+#if defined(ISC_SOCKET_DEBUG)
+	dump_msg(&msghdr);
+#endif
+
+	if (cc < 0) {
+		if (SOFT_ERROR(recv_errno))
+			return (DOIO_SOFT);
+
+		if (isc_log_wouldlog(isc_lctx, IOEVENT_LEVEL)) {
+			isc__strerror(recv_errno, strbuf, sizeof(strbuf));
+			socket_log(sock, NULL, IOEVENT,
+				   isc_msgcat, ISC_MSGSET_SOCKET,
+				   ISC_MSG_DOIORECV,
+				  "doio_recv: recvmsg(%d) %d bytes, err %d/%s",
+				   sock->fd, cc, recv_errno, strbuf);
+		}
+
+#define SOFT_OR_HARD(_system, _isc) \
+	if (recv_errno == _system) { \
+		if (sock->connected) { \
+			dev->result = _isc; \
+			inc_stats(sock->manager->stats, \
+				  sock->statsindex[STATID_RECVFAIL]); \
+			return (DOIO_HARD); \
+		} \
+		return (DOIO_SOFT); \
+	}
+#define ALWAYS_HARD(_system, _isc) \
+	if (recv_errno == _system) { \
+		dev->result = _isc; \
+		inc_stats(sock->manager->stats, \
+			  sock->statsindex[STATID_RECVFAIL]); \
+		return (DOIO_HARD); \
+	}
+
+		SOFT_OR_HARD(ECONNREFUSED, ISC_R_CONNREFUSED);
+		SOFT_OR_HARD(ENETUNREACH, ISC_R_NETUNREACH);
+		SOFT_OR_HARD(EHOSTUNREACH, ISC_R_HOSTUNREACH);
+		SOFT_OR_HARD(EHOSTDOWN, ISC_R_HOSTDOWN);
+		/* HPUX 11.11 can return EADDRNOTAVAIL. */
+		SOFT_OR_HARD(EADDRNOTAVAIL, ISC_R_ADDRNOTAVAIL);
+		SOFT_OR_HARD(ENOBUFS, ISC_R_NORESOURCES);
+		/* Should never get this one but it was seen. */
+#ifdef ENOPROTOOPT
+		SOFT_OR_HARD(ENOPROTOOPT, ISC_R_HOSTUNREACH);
+#endif
+		/*
+		 * HPUX returns EPROTO and EINVAL on receiving some ICMP/ICMPv6
+		 * errors.
+		 */
+#ifdef EPROTO
+		SOFT_OR_HARD(EPROTO, ISC_R_HOSTUNREACH);
+#endif
+		SOFT_OR_HARD(EINVAL, ISC_R_HOSTUNREACH);
+
+#undef SOFT_OR_HARD
+#undef ALWAYS_HARD
+
+		dev->result = isc__errno2result(recv_errno);
+		inc_stats(sock->manager->stats,
+			  sock->statsindex[STATID_RECVFAIL]);
+		return (DOIO_HARD);
+	}
+
+	/*
+	 * On TCP and UNIX sockets, zero length reads indicate EOF,
+	 * while on UDP sockets, zero length reads are perfectly valid,
+	 * although strange.
+	 */
+	switch (sock->type) {
+	case isc_sockettype_tcp:
+	case isc_sockettype_unix:
+		if (cc == 0)
+			return (DOIO_EOF);
+		break;
+	case isc_sockettype_udp:
+	case isc_sockettype_raw:
+		break;
+	case isc_sockettype_fdwatch:
+	default:
+		INSIST(0);
+	}
+
+	if (sock->type == isc_sockettype_udp) {
+		dev->address.length = msghdr.msg_namelen;
+		if (isc_sockaddr_getport(&dev->address) == 0) {
+			if (isc_log_wouldlog(isc_lctx, IOEVENT_LEVEL)) {
+				socket_log(sock, &dev->address, IOEVENT,
+					   isc_msgcat, ISC_MSGSET_SOCKET,
+					   ISC_MSG_ZEROPORT,
+					   "dropping source port zero packet");
+			}
+			return (DOIO_SOFT);
+		}
+		/*
+		 * Simulate a firewall blocking UDP responses bigger than
+		 * 'maxudp' bytes.
+		 */
+		if (sock->manager->maxudp != 0 && cc > sock->manager->maxudp)
+			return (DOIO_SOFT);
+	}
+
+	socket_log(sock, &dev->address, IOEVENT,
+		   isc_msgcat, ISC_MSGSET_SOCKET, ISC_MSG_PKTRECV,
+		   "packet received correctly");
+
+	/*
+	 * Overflow bit detection.  If we received MORE bytes than we should,
+	 * this indicates an overflow situation.  Set the flag in the
+	 * dev entry and adjust how much we read by one.
+	 */
+#ifdef ISC_PLATFORM_RECVOVERFLOW
+	if ((sock->type == isc_sockettype_udp) && ((size_t)cc > read_count)) {
+		dev->attributes |= ISC_SOCKEVENTATTR_TRUNC;
+		cc--;
+	}
+#endif
+
+	/*
+	 * If there are control messages attached, run through them and pull
+	 * out the interesting bits.
+	 */
+	process_cmsg(sock, &msghdr, dev);
+
+	/*
+	 * update the buffers (if any) and the i/o count
+	 */
+	dev->n += cc;
+	actual_count = cc;
+	buffer = ISC_LIST_HEAD(dev->bufferlist);
+	while (buffer != NULL && actual_count > 0U) {
+		REQUIRE(ISC_BUFFER_VALID(buffer));
+		if (isc_buffer_availablelength(buffer) <= actual_count) {
+			actual_count -= isc_buffer_availablelength(buffer);
+			isc_buffer_add(buffer,
+				       isc_buffer_availablelength(buffer));
+		} else {
+			isc_buffer_add(buffer, actual_count);
+			actual_count = 0;
+			POST(actual_count);
+			break;
+		}
+		buffer = ISC_LIST_NEXT(buffer, link);
+		if (buffer == NULL) {
+			INSIST(actual_count == 0U);
+		}
+	}
+
+	/*
+	 * If we read less than we expected, update counters,
+	 * and let the upper layer poke the descriptor.
+	 */
+	if (((size_t)cc != read_count) && (dev->n < dev->minimum))
+		return (DOIO_SOFT);
+
+	/*
+	 * Full reads are posted, or partials if partials are ok.
+	 */
+	dev->result = ISC_R_SUCCESS;
+	return (DOIO_SUCCESS);
+}
+
+/*
+ * Returns:
+ *	DOIO_SUCCESS	The operation succeeded.  dev->result contains
+ *			ISC_R_SUCCESS.
+ *
+ *	DOIO_HARD	A hard or unexpected I/O error was encountered.
+ *			dev->result contains the appropriate error.
+ *
+ *	DOIO_SOFT	A soft I/O error was encountered.  No senddone
+ *			event was sent.  The operation should be retried.
+ *
+ *	No other return values are possible.
+ */
+static int
+doio_send(isc__socket_t *sock, isc_socketevent_t *dev) {
+	int cc;
+	struct iovec iov[MAXSCATTERGATHER_SEND];
+	size_t write_count;
+	struct msghdr msghdr;
+	char addrbuf[ISC_SOCKADDR_FORMATSIZE];
+	int attempts = 0;
+	int send_errno;
+	char strbuf[ISC_STRERRORSIZE];
+	char cmsgbuf[SENDCMSGBUFLEN] = {0};
+
+	build_msghdr_send(sock, cmsgbuf, dev, &msghdr, iov, &write_count);
+
+ resend:
+	if (sock->type == isc_sockettype_udp &&
+	    sock->manager->maxudp != 0 &&
+	    write_count > (size_t)sock->manager->maxudp)
+		cc = write_count;
+	else
+		cc = sendmsg(sock->fd, &msghdr, 0);
+	send_errno = errno;
+
+	/*
+	 * Check for error or block condition.
+	 */
+	if (cc < 0) {
+		if (send_errno == EINTR && ++attempts < NRETRIES)
+			goto resend;
+
+		if (SOFT_ERROR(send_errno)) {
+			if (errno == EWOULDBLOCK || errno == EAGAIN)
+				dev->result = ISC_R_WOULDBLOCK;
+			return (DOIO_SOFT);
+		}
+
+#define SOFT_OR_HARD(_system, _isc) \
+	if (send_errno == _system) { \
+		if (sock->connected) { \
+			dev->result = _isc; \
+			inc_stats(sock->manager->stats, \
+				  sock->statsindex[STATID_SENDFAIL]); \
+			return (DOIO_HARD); \
+		} \
+		return (DOIO_SOFT); \
+	}
+#define ALWAYS_HARD(_system, _isc) \
+	if (send_errno == _system) { \
+		dev->result = _isc; \
+		inc_stats(sock->manager->stats, \
+			  sock->statsindex[STATID_SENDFAIL]); \
+		return (DOIO_HARD); \
+	}
+
+		SOFT_OR_HARD(ECONNREFUSED, ISC_R_CONNREFUSED);
+		ALWAYS_HARD(EACCES, ISC_R_NOPERM);
+		ALWAYS_HARD(EAFNOSUPPORT, ISC_R_ADDRNOTAVAIL);
+		ALWAYS_HARD(EADDRNOTAVAIL, ISC_R_ADDRNOTAVAIL);
+		ALWAYS_HARD(EHOSTUNREACH, ISC_R_HOSTUNREACH);
+#ifdef EHOSTDOWN
+		ALWAYS_HARD(EHOSTDOWN, ISC_R_HOSTUNREACH);
+#endif
+		ALWAYS_HARD(ENETUNREACH, ISC_R_NETUNREACH);
+		SOFT_OR_HARD(ENOBUFS, ISC_R_NORESOURCES);
+		ALWAYS_HARD(EPERM, ISC_R_HOSTUNREACH);
+		ALWAYS_HARD(EPIPE, ISC_R_NOTCONNECTED);
+		ALWAYS_HARD(ECONNRESET, ISC_R_CONNECTIONRESET);
+
+#undef SOFT_OR_HARD
+#undef ALWAYS_HARD
+
+		/*
+		 * The other error types depend on whether or not the
+		 * socket is UDP or TCP.  If it is UDP, some errors
+		 * that we expect to be fatal under TCP are merely
+		 * annoying, and are really soft errors.
+		 *
+		 * However, these soft errors are still returned as
+		 * a status.
+		 */
+		isc_sockaddr_format(&dev->address, addrbuf, sizeof(addrbuf));
+		isc__strerror(send_errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__, "internal_send: %s: %s",
+				 addrbuf, strbuf);
+		dev->result = isc__errno2result(send_errno);
+		inc_stats(sock->manager->stats,
+			  sock->statsindex[STATID_SENDFAIL]);
+		return (DOIO_HARD);
+	}
+
+	if (cc == 0) {
+		inc_stats(sock->manager->stats,
+			  sock->statsindex[STATID_SENDFAIL]);
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 "doio_send: send() %s 0",
+				 isc_msgcat_get(isc_msgcat, ISC_MSGSET_GENERAL,
+						ISC_MSG_RETURNED, "returned"));
+	}
+
+	/*
+	 * If we write less than we expected, update counters, poke.
+	 */
+	dev->n += cc;
+	if ((size_t)cc != write_count)
+		return (DOIO_SOFT);
+
+	/*
+	 * Exactly what we wanted to write.  We're done with this
+	 * entry.  Post its completion event.
+	 */
+	dev->result = ISC_R_SUCCESS;
+	return (DOIO_SUCCESS);
+}
+
+/*
+ * Kill.
+ *
+ * Caller must ensure that the socket is not locked and no external
+ * references exist.
+ */
+static void
+socketclose(isc__socketmgr_t *manager, isc__socket_t *sock, int fd) {
+	isc_sockettype_t type = sock->type;
+	int lockid = FDLOCK_ID(fd);
+
+	/*
+	 * No one has this socket open, so the watcher doesn't have to be
+	 * poked, and the socket doesn't have to be locked.
+	 */
+	LOCK(&manager->fdlock[lockid]);
+	manager->fds[fd] = NULL;
+	if (type == isc_sockettype_fdwatch)
+		manager->fdstate[fd] = CLOSED;
+	else
+		manager->fdstate[fd] = CLOSE_PENDING;
+	UNLOCK(&manager->fdlock[lockid]);
+	if (type == isc_sockettype_fdwatch) {
+		/*
+		 * The caller may close the socket once this function returns,
+		 * and `fd' may be reassigned for a new socket.  So we do
+		 * unwatch_fd() here, rather than defer it via select_poke().
+		 * Note: this may complicate data protection among threads and
+		 * may reduce performance due to additional locks.  One way to
+		 * solve this would be to dup() the watched descriptor, but we
+		 * take a simpler approach at this moment.
+		 */
+		(void)unwatch_fd(manager, fd, SELECT_POKE_READ);
+		(void)unwatch_fd(manager, fd, SELECT_POKE_WRITE);
+	} else
+		select_poke(manager, fd, SELECT_POKE_CLOSE);
+
+	inc_stats(manager->stats, sock->statsindex[STATID_CLOSE]);
+	if (sock->active == 1) {
+		dec_stats(manager->stats, sock->statsindex[STATID_ACTIVE]);
+		sock->active = 0;
+	}
+
+	/*
+	 * update manager->maxfd here (XXX: this should be implemented more
+	 * efficiently)
+	 */
+#ifdef USE_SELECT
+	LOCK(&manager->lock);
+	if (manager->maxfd == fd) {
+		int i;
+
+		manager->maxfd = 0;
+		for (i = fd - 1; i >= 0; i--) {
+			lockid = FDLOCK_ID(i);
+
+			LOCK(&manager->fdlock[lockid]);
+			if (manager->fdstate[i] == MANAGED) {
+				manager->maxfd = i;
+				UNLOCK(&manager->fdlock[lockid]);
+				break;
+			}
+			UNLOCK(&manager->fdlock[lockid]);
+		}
+#ifdef ISC_PLATFORM_USETHREADS
+		if (manager->maxfd < manager->pipe_fds[0])
+			manager->maxfd = manager->pipe_fds[0];
+#endif
+	}
+
+	UNLOCK(&manager->lock);
+#endif	/* USE_SELECT */
+}
+
+static void
+destroy(isc__socket_t **sockp) {
+	int fd;
+	isc__socket_t *sock = *sockp;
+	isc__socketmgr_t *manager = sock->manager;
+
+	socket_log(sock, NULL, CREATION, isc_msgcat, ISC_MSGSET_SOCKET,
+		   ISC_MSG_DESTROYING, "destroying");
+
+	INSIST(ISC_LIST_EMPTY(sock->connect_list));
+	INSIST(ISC_LIST_EMPTY(sock->accept_list));
+	INSIST(ISC_LIST_EMPTY(sock->recv_list));
+	INSIST(ISC_LIST_EMPTY(sock->send_list));
+	INSIST(sock->fd >= -1 && sock->fd < (int)manager->maxsocks);
+
+	if (sock->fd >= 0) {
+		fd = sock->fd;
+		sock->fd = -1;
+		socketclose(manager, sock, fd);
+	}
+
+	LOCK(&manager->lock);
+
+	ISC_LIST_UNLINK(manager->socklist, sock, link);
+
+#ifdef USE_WATCHER_THREAD
+	if (ISC_LIST_EMPTY(manager->socklist))
+		SIGNAL(&manager->shutdown_ok);
+#endif /* USE_WATCHER_THREAD */
+
+	/* can't unlock manager as its memory context is still used */
+	free_socket(sockp);
+
+	UNLOCK(&manager->lock);
+}
+
+static isc_result_t
+allocate_socket(isc__socketmgr_t *manager, isc_sockettype_t type,
+		isc__socket_t **socketp)
+{
+	isc__socket_t *sock;
+	isc_result_t result;
+
+	sock = isc_mem_get(manager->mctx, sizeof(*sock));
+
+	if (sock == NULL)
+		return (ISC_R_NOMEMORY);
+
+	sock->common.magic = 0;
+	sock->common.impmagic = 0;
+	sock->references = 0;
+
+	sock->manager = manager;
+	sock->type = type;
+	sock->fd = -1;
+	sock->dscp = 0;		/* TOS/TCLASS is zero until set. */
+	sock->dupped = 0;
+	sock->statsindex = NULL;
+	sock->active = 0;
+
+	ISC_LINK_INIT(sock, link);
+
+
+	memset(sock->name, 0, sizeof(sock->name));
+	sock->tag = NULL;
+
+	/*
+	 * Set up list of readers and writers to be initially empty.
+	 */
+	ISC_LIST_INIT(sock->recv_list);
+	ISC_LIST_INIT(sock->send_list);
+	ISC_LIST_INIT(sock->accept_list);
+	ISC_LIST_INIT(sock->connect_list);
+	sock->pending_recv = 0;
+	sock->pending_send = 0;
+	sock->pending_accept = 0;
+	sock->listener = 0;
+	sock->connected = 0;
+	sock->connecting = 0;
+	sock->bound = 0;
+	sock->pktdscp = 0;
+
+	/*
+	 * Initialize the lock.
+	 */
+	result = isc_mutex_init(&sock->lock);
+	if (result != ISC_R_SUCCESS) {
+		sock->common.magic = 0;
+		sock->common.impmagic = 0;
+		goto error;
+	}
+
+	/*
+	 * Initialize readable and writable events.
+	 */
+	ISC_EVENT_INIT(&sock->readable_ev, sizeof(intev_t),
+		       ISC_EVENTATTR_NOPURGE, NULL, ISC_SOCKEVENT_INTR,
+		       NULL, sock, sock, NULL, NULL);
+	ISC_EVENT_INIT(&sock->writable_ev, sizeof(intev_t),
+		       ISC_EVENTATTR_NOPURGE, NULL, ISC_SOCKEVENT_INTW,
+		       NULL, sock, sock, NULL, NULL);
+
+	sock->common.magic = ISCAPI_SOCKET_MAGIC;
+	sock->common.impmagic = SOCKET_MAGIC;
+	*socketp = sock;
+
+	return (ISC_R_SUCCESS);
+
+ error:
+	isc_mem_put(manager->mctx, sock, sizeof(*sock));
+
+	return (result);
+}
+
+/*
+ * This event requires that the various lists be empty, that the reference
+ * count be 1, and that the magic number is valid.  The other socket bits,
+ * like the lock, must be initialized as well.  The fd associated must be
+ * marked as closed, by setting it to -1 on close, or this routine will
+ * also close the socket.
+ */
+static void
+free_socket(isc__socket_t **socketp) {
+	isc__socket_t *sock = *socketp;
+
+	INSIST(VALID_SOCKET(sock));
+	INSIST(sock->references == 0);
+	INSIST(!sock->connecting);
+	INSIST(!sock->pending_recv);
+	INSIST(!sock->pending_send);
+	INSIST(!sock->pending_accept);
+	INSIST(ISC_LIST_EMPTY(sock->recv_list));
+	INSIST(ISC_LIST_EMPTY(sock->send_list));
+	INSIST(ISC_LIST_EMPTY(sock->accept_list));
+	INSIST(ISC_LIST_EMPTY(sock->connect_list));
+	INSIST(!ISC_LINK_LINKED(sock, link));
+
+	sock->common.magic = 0;
+	sock->common.impmagic = 0;
+
+	DESTROYLOCK(&sock->lock);
+
+	isc_mem_put(sock->manager->mctx, sock, sizeof(*sock));
+
+	*socketp = NULL;
+}
+
+#ifdef SO_RCVBUF
+static isc_once_t	rcvbuf_once = ISC_ONCE_INIT;
+static int		rcvbuf = RCVBUFSIZE;
+
+static void
+set_rcvbuf(void) {
+	int fd;
+	int max = rcvbuf, min;
+	ISC_SOCKADDR_LEN_T len;
+
+	fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
+#if defined(ISC_PLATFORM_HAVEIPV6)
+	if (fd == -1) {
+		switch (errno) {
+		case EPROTONOSUPPORT:
+		case EPFNOSUPPORT:
+		case EAFNOSUPPORT:
+		/*
+		 * Linux 2.2 (and maybe others) return EINVAL instead of
+		 * EAFNOSUPPORT.
+		 */
+		case EINVAL:
+			fd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
+			break;
+		}
+	}
+#endif
+	if (fd == -1)
+		return;
+
+	len = sizeof(min);
+	if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, (void *)&min, &len) == 0 &&
+	    min < rcvbuf) {
+ again:
+		if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, (void *)&rcvbuf,
+			       sizeof(rcvbuf)) == -1) {
+			if (errno == ENOBUFS && rcvbuf > min) {
+				max = rcvbuf - 1;
+				rcvbuf = (rcvbuf + min) / 2;
+				goto again;
+			} else {
+				rcvbuf = min;
+				goto cleanup;
+			}
+		} else
+			min = rcvbuf;
+		if (min != max) {
+			rcvbuf = max;
+			goto again;
+		}
+	}
+ cleanup:
+	close (fd);
+}
+#endif
+
+#ifdef SO_BSDCOMPAT
+/*
+ * This really should not be necessary to do.  Having to workout
+ * which kernel version we are on at run time so that we don't cause
+ * the kernel to issue a warning about us using a deprecated socket option.
+ * Such warnings should *never* be on by default in production kernels.
+ *
+ * We can't do this a build time because executables are moved between
+ * machines and hence kernels.
+ *
+ * We can't just not set SO_BSDCOMAT because some kernels require it.
+ */
+
+static isc_once_t         bsdcompat_once = ISC_ONCE_INIT;
+bool bsdcompat = true;
+
+static void
+clear_bsdcompat(void) {
+#ifdef __linux__
+	 struct utsname buf;
+	 char *endp;
+	 long int major;
+	 long int minor;
+
+	 uname(&buf);    /* Can only fail if buf is bad in Linux. */
+
+	 /* Paranoia in parsing can be increased, but we trust uname(). */
+	 major = strtol(buf.release, &endp, 10);
+	 if (*endp == '.') {
+		minor = strtol(endp+1, &endp, 10);
+		if ((major > 2) || ((major == 2) && (minor >= 4))) {
+			bsdcompat = false;
+		}
+	 }
+#endif /* __linux __ */
+}
+#endif
+
+static void
+use_min_mtu(isc__socket_t *sock) {
+#if !defined(IPV6_USE_MIN_MTU) && !defined(IPV6_MTU)
+	UNUSED(sock);
+#endif
+#ifdef IPV6_USE_MIN_MTU
+	/* use minimum MTU */
+	if (sock->pf == AF_INET6) {
+		int on = 1;
+		(void)setsockopt(sock->fd, IPPROTO_IPV6, IPV6_USE_MIN_MTU,
+				(void *)&on, sizeof(on));
+	}
+#endif
+#if defined(IPV6_MTU)
+	/*
+	 * Use minimum MTU on IPv6 sockets.
+	 */
+	if (sock->pf == AF_INET6) {
+		int mtu = 1280;
+		(void)setsockopt(sock->fd, IPPROTO_IPV6, IPV6_MTU,
+				 &mtu, sizeof(mtu));
+	}
+#endif
+}
+
+static void
+set_tcp_maxseg(isc__socket_t *sock, int size) {
+#ifdef TCP_MAXSEG
+	if (sock->type == isc_sockettype_tcp)
+		(void)setsockopt(sock->fd, IPPROTO_TCP, TCP_MAXSEG,
+				(void *)&size, sizeof(size));
+#endif
+}
+
+static isc_result_t
+opensocket(isc__socketmgr_t *manager, isc__socket_t *sock,
+	   isc__socket_t *dup_socket)
+{
+	isc_result_t result;
+	char strbuf[ISC_STRERRORSIZE];
+	const char *err = "socket";
+	int tries = 0;
+#if defined(USE_CMSG) || defined(SO_BSDCOMPAT) || defined(SO_NOSIGPIPE)
+	int on = 1;
+#endif
+#if defined(SO_RCVBUF)
+	ISC_SOCKADDR_LEN_T optlen;
+	int size = 0;
+#endif
+
+ again:
+	if (dup_socket == NULL) {
+		switch (sock->type) {
+		case isc_sockettype_udp:
+			sock->fd = socket(sock->pf, SOCK_DGRAM, IPPROTO_UDP);
+			break;
+		case isc_sockettype_tcp:
+			sock->fd = socket(sock->pf, SOCK_STREAM, IPPROTO_TCP);
+			break;
+		case isc_sockettype_unix:
+			sock->fd = socket(sock->pf, SOCK_STREAM, 0);
+			break;
+		case isc_sockettype_raw:
+			errno = EPFNOSUPPORT;
+			/*
+			 * PF_ROUTE is a alias for PF_NETLINK on linux.
+			 */
+#if defined(PF_ROUTE)
+			if (sock->fd == -1 && sock->pf == PF_ROUTE) {
+#ifdef NETLINK_ROUTE
+				sock->fd = socket(sock->pf, SOCK_RAW,
+						  NETLINK_ROUTE);
+#else
+				sock->fd = socket(sock->pf, SOCK_RAW, 0);
+#endif
+				if (sock->fd != -1) {
+#ifdef NETLINK_ROUTE
+					struct sockaddr_nl sa;
+					int n;
+
+					/*
+					 * Do an implicit bind.
+					 */
+					memset(&sa, 0, sizeof(sa));
+					sa.nl_family = AF_NETLINK;
+					sa.nl_groups = RTMGRP_IPV4_IFADDR |
+						       RTMGRP_IPV6_IFADDR;
+					n = bind(sock->fd,
+						 (struct sockaddr *) &sa,
+						 sizeof(sa));
+					if (n < 0) {
+						close(sock->fd);
+						sock->fd = -1;
+					}
+#endif
+					sock->bound = 1;
+				}
+			}
+#endif
+			break;
+		case isc_sockettype_fdwatch:
+			/*
+			 * We should not be called for isc_sockettype_fdwatch
+			 * sockets.
+			 */
+			INSIST(0);
+			break;
+		}
+	} else {
+		sock->fd = dup(dup_socket->fd);
+		sock->dupped = 1;
+		sock->bound = dup_socket->bound;
+	}
+	if (sock->fd == -1 && errno == EINTR && tries++ < 42)
+		goto again;
+
+#ifdef F_DUPFD
+	/*
+	 * Leave a space for stdio and TCP to work in.
+	 */
+	if (manager->reserved != 0 && sock->type == isc_sockettype_udp &&
+	    sock->fd >= 0 && sock->fd < manager->reserved) {
+		int newfd, tmp;
+		newfd = fcntl(sock->fd, F_DUPFD, manager->reserved);
+		tmp = errno;
+		(void)close(sock->fd);
+		errno = tmp;
+		sock->fd = newfd;
+		err = "isc_socket_create: fcntl/reserved";
+	} else if (sock->fd >= 0 && sock->fd < 20) {
+		int newfd, tmp;
+		newfd = fcntl(sock->fd, F_DUPFD, 20);
+		tmp = errno;
+		(void)close(sock->fd);
+		errno = tmp;
+		sock->fd = newfd;
+		err = "isc_socket_create: fcntl";
+	}
+#endif
+
+	if (sock->fd >= (int)manager->maxsocks) {
+		(void)close(sock->fd);
+		isc_log_iwrite(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+			       ISC_LOGMODULE_SOCKET, ISC_LOG_ERROR,
+			       isc_msgcat, ISC_MSGSET_SOCKET,
+			       ISC_MSG_TOOMANYFDS,
+			       "socket: file descriptor exceeds limit (%d/%u)",
+			       sock->fd, manager->maxsocks);
+		inc_stats(manager->stats, sock->statsindex[STATID_OPENFAIL]);
+		return (ISC_R_NORESOURCES);
+	}
+
+	if (sock->fd < 0) {
+		switch (errno) {
+		case EMFILE:
+		case ENFILE:
+			isc__strerror(errno, strbuf, sizeof(strbuf));
+			isc_log_iwrite(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+				       ISC_LOGMODULE_SOCKET, ISC_LOG_ERROR,
+				       isc_msgcat, ISC_MSGSET_SOCKET,
+				       ISC_MSG_TOOMANYFDS,
+				       "%s: %s", err, strbuf);
+			/* fallthrough */
+		case ENOBUFS:
+			inc_stats(manager->stats,
+				  sock->statsindex[STATID_OPENFAIL]);
+			return (ISC_R_NORESOURCES);
+
+		case EPROTONOSUPPORT:
+		case EPFNOSUPPORT:
+		case EAFNOSUPPORT:
+		/*
+		 * Linux 2.2 (and maybe others) return EINVAL instead of
+		 * EAFNOSUPPORT.
+		 */
+		case EINVAL:
+			inc_stats(manager->stats,
+				  sock->statsindex[STATID_OPENFAIL]);
+			return (ISC_R_FAMILYNOSUPPORT);
+
+		default:
+			isc__strerror(errno, strbuf, sizeof(strbuf));
+			UNEXPECTED_ERROR(__FILE__, __LINE__,
+					 "%s() %s: %s", err,
+					 isc_msgcat_get(isc_msgcat,
+							ISC_MSGSET_GENERAL,
+							ISC_MSG_FAILED,
+							"failed"),
+					 strbuf);
+			inc_stats(manager->stats,
+				  sock->statsindex[STATID_OPENFAIL]);
+			return (ISC_R_UNEXPECTED);
+		}
+	}
+
+	if (dup_socket != NULL)
+		goto setup_done;
+
+	result = make_nonblock(sock->fd);
+	if (result != ISC_R_SUCCESS) {
+		(void)close(sock->fd);
+		inc_stats(manager->stats, sock->statsindex[STATID_OPENFAIL]);
+		return (result);
+	}
+
+#ifdef SO_BSDCOMPAT
+	RUNTIME_CHECK(isc_once_do(&bsdcompat_once,
+				  clear_bsdcompat) == ISC_R_SUCCESS);
+	if (sock->type != isc_sockettype_unix && bsdcompat &&
+	    setsockopt(sock->fd, SOL_SOCKET, SO_BSDCOMPAT,
+		       (void *)&on, sizeof(on)) < 0) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 "setsockopt(%d, SO_BSDCOMPAT) %s: %s",
+				 sock->fd,
+				 isc_msgcat_get(isc_msgcat, ISC_MSGSET_GENERAL,
+						ISC_MSG_FAILED, "failed"),
+				 strbuf);
+		/* Press on... */
+	}
+#endif
+
+#ifdef SO_NOSIGPIPE
+	if (setsockopt(sock->fd, SOL_SOCKET, SO_NOSIGPIPE,
+		       (void *)&on, sizeof(on)) < 0) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 "setsockopt(%d, SO_NOSIGPIPE) %s: %s",
+				 sock->fd,
+				 isc_msgcat_get(isc_msgcat, ISC_MSGSET_GENERAL,
+						ISC_MSG_FAILED, "failed"),
+				 strbuf);
+		/* Press on... */
+	}
+#endif
+
+	/*
+	 * Use minimum mtu if possible.
+	 */
+	if (sock->type == isc_sockettype_tcp && sock->pf == AF_INET6) {
+		use_min_mtu(sock);
+		set_tcp_maxseg(sock, 1280 - 20 - 40); /* 1280 - TCP - IPV6 */
+	}
+
+#if defined(USE_CMSG) || defined(SO_RCVBUF)
+	if (sock->type == isc_sockettype_udp) {
+
+#if defined(USE_CMSG)
+#if defined(SO_TIMESTAMP)
+		if (setsockopt(sock->fd, SOL_SOCKET, SO_TIMESTAMP,
+			       (void *)&on, sizeof(on)) < 0
+		    && errno != ENOPROTOOPT) {
+			isc__strerror(errno, strbuf, sizeof(strbuf));
+			UNEXPECTED_ERROR(__FILE__, __LINE__,
+					 "setsockopt(%d, SO_TIMESTAMP) %s: %s",
+					 sock->fd,
+					 isc_msgcat_get(isc_msgcat,
+							ISC_MSGSET_GENERAL,
+							ISC_MSG_FAILED,
+							"failed"),
+					 strbuf);
+			/* Press on... */
+		}
+#endif /* SO_TIMESTAMP */
+
+#if defined(ISC_PLATFORM_HAVEIPV6)
+#ifdef ISC_PLATFORM_HAVEIN6PKTINFO
+#ifdef IPV6_RECVPKTINFO
+		/* RFC 3542 */
+		if ((sock->pf == AF_INET6)
+		    && (setsockopt(sock->fd, IPPROTO_IPV6, IPV6_RECVPKTINFO,
+				   (void *)&on, sizeof(on)) < 0)) {
+			isc__strerror(errno, strbuf, sizeof(strbuf));
+			UNEXPECTED_ERROR(__FILE__, __LINE__,
+					 "setsockopt(%d, IPV6_RECVPKTINFO) "
+					 "%s: %s", sock->fd,
+					 isc_msgcat_get(isc_msgcat,
+							ISC_MSGSET_GENERAL,
+							ISC_MSG_FAILED,
+							"failed"),
+					 strbuf);
+		}
+#else
+		/* RFC 2292 */
+		if ((sock->pf == AF_INET6)
+		    && (setsockopt(sock->fd, IPPROTO_IPV6, IPV6_PKTINFO,
+				   (void *)&on, sizeof(on)) < 0)) {
+			isc__strerror(errno, strbuf, sizeof(strbuf));
+			UNEXPECTED_ERROR(__FILE__, __LINE__,
+					 "setsockopt(%d, IPV6_PKTINFO) %s: %s",
+					 sock->fd,
+					 isc_msgcat_get(isc_msgcat,
+							ISC_MSGSET_GENERAL,
+							ISC_MSG_FAILED,
+							"failed"),
+					 strbuf);
+		}
+#endif /* IPV6_RECVPKTINFO */
+#endif /* ISC_PLATFORM_HAVEIN6PKTINFO */
+#if defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DONT)
+		/*
+		 * Turn off Path MTU discovery on IPv6/UDP sockets.
+		 */
+		if (sock->pf == AF_INET6) {
+			int action = IPV6_PMTUDISC_DONT;
+			(void)setsockopt(sock->fd, IPPROTO_IPV6,
+					 IPV6_MTU_DISCOVER, &action,
+					 sizeof(action));
+		}
+#endif
+#endif /* ISC_PLATFORM_HAVEIPV6 */
+#endif /* defined(USE_CMSG) */
+
+#if defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DONT)
+		/*
+		 * Turn off Path MTU discovery on IPv4/UDP sockets.
+		 * Prefer IP_PMTUDISC_OMIT over IP_PMTUDISC_DONT
+		 * if it available.
+		 */
+		if (sock->pf == AF_INET) {
+			int action;
+#if defined(IP_PMTUDISC_OMIT)
+			action = IP_PMTUDISC_OMIT;
+			if (setsockopt(sock->fd, IPPROTO_IP,
+				       IP_MTU_DISCOVER, &action,
+				       sizeof(action)) < 0) {
+#endif
+				action = IP_PMTUDISC_DONT;
+				(void)setsockopt(sock->fd, IPPROTO_IP,
+						 IP_MTU_DISCOVER,
+						 &action, sizeof(action));
+#if defined(IP_PMTUDISC_OMIT)
+			}
+#endif
+		}
+#endif
+#if defined(IP_DONTFRAG)
+		/*
+		 * Turn off Path MTU discovery on IPv4/UDP sockets.
+		 */
+		if (sock->pf == AF_INET) {
+			int off = 0;
+			(void)setsockopt(sock->fd, IPPROTO_IP, IP_DONTFRAG,
+					 &off, sizeof(off));
+		}
+#endif
+
+#if defined(SO_RCVBUF)
+		optlen = sizeof(size);
+		if (getsockopt(sock->fd, SOL_SOCKET, SO_RCVBUF,
+			       (void *)&size, &optlen) == 0 && size < rcvbuf) {
+			RUNTIME_CHECK(isc_once_do(&rcvbuf_once,
+						  set_rcvbuf) == ISC_R_SUCCESS);
+			if (setsockopt(sock->fd, SOL_SOCKET, SO_RCVBUF,
+			       (void *)&rcvbuf, sizeof(rcvbuf)) == -1) {
+				isc__strerror(errno, strbuf, sizeof(strbuf));
+				UNEXPECTED_ERROR(__FILE__, __LINE__,
+					"setsockopt(%d, SO_RCVBUF, %d) %s: %s",
+					sock->fd, rcvbuf,
+					isc_msgcat_get(isc_msgcat,
+						       ISC_MSGSET_GENERAL,
+						       ISC_MSG_FAILED,
+						       "failed"),
+					strbuf);
+			}
+		}
+#endif
+	}
+#ifdef IPV6_RECVTCLASS
+	if ((sock->pf == AF_INET6)
+	    && (setsockopt(sock->fd, IPPROTO_IPV6, IPV6_RECVTCLASS,
+			   (void *)&on, sizeof(on)) < 0)) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 "setsockopt(%d, IPV6_RECVTCLASS) "
+				 "%s: %s", sock->fd,
+				 isc_msgcat_get(isc_msgcat, ISC_MSGSET_GENERAL,
+						ISC_MSG_FAILED, "failed"),
+				 strbuf);
+	}
+#endif
+#ifdef IP_RECVTOS
+	if ((sock->pf == AF_INET)
+	    && (setsockopt(sock->fd, IPPROTO_IP, IP_RECVTOS,
+			   (void *)&on, sizeof(on)) < 0)) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 "setsockopt(%d, IP_RECVTOS) "
+				 "%s: %s", sock->fd,
+				 isc_msgcat_get(isc_msgcat, ISC_MSGSET_GENERAL,
+						ISC_MSG_FAILED, "failed"),
+				 strbuf);
+	}
+#endif
+#endif /* defined(USE_CMSG) || defined(SO_RCVBUF) */
+
+setup_done:
+	inc_stats(manager->stats, sock->statsindex[STATID_OPEN]);
+	if (sock->active == 0) {
+		inc_stats(manager->stats, sock->statsindex[STATID_ACTIVE]);
+		sock->active = 1;
+	}
+
+	return (ISC_R_SUCCESS);
+}
+
+/*
+ * Create a 'type' socket or duplicate an existing socket, managed
+ * by 'manager'.  Events will be posted to 'task' and when dispatched
+ * 'action' will be called with 'arg' as the arg value.  The new
+ * socket is returned in 'socketp'.
+ */
+static isc_result_t
+socket_create(isc_socketmgr_t *manager0, int pf, isc_sockettype_t type,
+	      isc_socket_t **socketp, isc_socket_t *dup_socket)
+{
+	isc__socket_t *sock = NULL;
+	isc__socketmgr_t *manager = (isc__socketmgr_t *)manager0;
+	isc_result_t result;
+	int lockid;
+
+	REQUIRE(VALID_MANAGER(manager));
+	REQUIRE(socketp != NULL && *socketp == NULL);
+	REQUIRE(type != isc_sockettype_fdwatch);
+
+	result = allocate_socket(manager, type, &sock);
+	if (result != ISC_R_SUCCESS)
+		return (result);
+
+	switch (sock->type) {
+	case isc_sockettype_udp:
+		sock->statsindex =
+			(pf == AF_INET) ? udp4statsindex : udp6statsindex;
+#define DCSPPKT(pf) ((pf == AF_INET) ? ISC_NET_DSCPPKTV4 : ISC_NET_DSCPPKTV6)
+		sock->pktdscp = (isc_net_probedscp() & DCSPPKT(pf)) != 0;
+		break;
+	case isc_sockettype_tcp:
+		sock->statsindex =
+			(pf == AF_INET) ? tcp4statsindex : tcp6statsindex;
+		break;
+	case isc_sockettype_unix:
+		sock->statsindex = unixstatsindex;
+		break;
+	case isc_sockettype_raw:
+		sock->statsindex = rawstatsindex;
+		break;
+	default:
+		INSIST(0);
+	}
+
+	sock->pf = pf;
+
+	result = opensocket(manager, sock, (isc__socket_t *)dup_socket);
+	if (result != ISC_R_SUCCESS) {
+		free_socket(&sock);
+		return (result);
+	}
+
+	sock->common.methods = (isc_socketmethods_t *)&socketmethods;
+	sock->references = 1;
+	*socketp = (isc_socket_t *)sock;
+
+	/*
+	 * Note we don't have to lock the socket like we normally would because
+	 * there are no external references to it yet.
+	 */
+
+	lockid = FDLOCK_ID(sock->fd);
+	LOCK(&manager->fdlock[lockid]);
+	manager->fds[sock->fd] = sock;
+	manager->fdstate[sock->fd] = MANAGED;
+#if defined(USE_EPOLL)
+	manager->epoll_events[sock->fd] = 0;
+#endif
+#ifdef USE_DEVPOLL
+	INSIST(sock->manager->fdpollinfo[sock->fd].want_read == 0 &&
+	       sock->manager->fdpollinfo[sock->fd].want_write == 0);
+#endif
+	UNLOCK(&manager->fdlock[lockid]);
+
+	LOCK(&manager->lock);
+	ISC_LIST_APPEND(manager->socklist, sock, link);
+#ifdef USE_SELECT
+	if (manager->maxfd < sock->fd)
+		manager->maxfd = sock->fd;
+#endif
+	UNLOCK(&manager->lock);
+
+	socket_log(sock, NULL, CREATION, isc_msgcat, ISC_MSGSET_SOCKET,
+		   ISC_MSG_CREATED, dup_socket != NULL ? "dupped" : "created");
+
+	return (ISC_R_SUCCESS);
+}
+
+/*%
+ * Create a new 'type' socket managed by 'manager'.  Events
+ * will be posted to 'task' and when dispatched 'action' will be
+ * called with 'arg' as the arg value.  The new socket is returned
+ * in 'socketp'.
+ */
+isc_result_t
+isc__socket_create(isc_socketmgr_t *manager0, int pf, isc_sockettype_t type,
+		   isc_socket_t **socketp)
+{
+	return (socket_create(manager0, pf, type, socketp, NULL));
+}
+
+/*%
+ * Duplicate an existing socket.  The new socket is returned
+ * in 'socketp'.
+ */
+isc_result_t
+isc__socket_dup(isc_socket_t *sock0, isc_socket_t **socketp) {
+	isc__socket_t *sock = (isc__socket_t *)sock0;
+
+	REQUIRE(VALID_SOCKET(sock));
+	REQUIRE(socketp != NULL && *socketp == NULL);
+
+	return (socket_create((isc_socketmgr_t *) sock->manager,
+			      sock->pf, sock->type, socketp,
+			      sock0));
+}
+
+isc_result_t
+isc__socket_open(isc_socket_t *sock0) {
+	isc_result_t result;
+	isc__socket_t *sock = (isc__socket_t *)sock0;
+
+	REQUIRE(VALID_SOCKET(sock));
+
+	LOCK(&sock->lock);
+	REQUIRE(sock->references == 1);
+	REQUIRE(sock->type != isc_sockettype_fdwatch);
+	UNLOCK(&sock->lock);
+	/*
+	 * We don't need to retain the lock hereafter, since no one else has
+	 * this socket.
+	 */
+	REQUIRE(sock->fd == -1);
+
+	result = opensocket(sock->manager, sock, NULL);
+	if (result != ISC_R_SUCCESS)
+		sock->fd = -1;
+
+	if (result == ISC_R_SUCCESS) {
+		int lockid = FDLOCK_ID(sock->fd);
+
+		LOCK(&sock->manager->fdlock[lockid]);
+		sock->manager->fds[sock->fd] = sock;
+		sock->manager->fdstate[sock->fd] = MANAGED;
+#if defined(USE_EPOLL)
+		sock->manager->epoll_events[sock->fd] = 0;
+#endif
+#ifdef USE_DEVPOLL
+		INSIST(sock->manager->fdpollinfo[sock->fd].want_read == 0 &&
+		       sock->manager->fdpollinfo[sock->fd].want_write == 0);
+#endif
+		UNLOCK(&sock->manager->fdlock[lockid]);
+
+#ifdef USE_SELECT
+		LOCK(&sock->manager->lock);
+		if (sock->manager->maxfd < sock->fd)
+			sock->manager->maxfd = sock->fd;
+		UNLOCK(&sock->manager->lock);
+#endif
+	}
+
+	return (result);
+}
+
+/*
+ * Create a new 'type' socket managed by 'manager'.  Events
+ * will be posted to 'task' and when dispatched 'action' will be
+ * called with 'arg' as the arg value.  The new socket is returned
+ * in 'socketp'.
+ */
+isc_result_t
+isc__socket_fdwatchcreate(isc_socketmgr_t *manager0, int fd, int flags,
+			  isc_sockfdwatch_t callback, void *cbarg,
+			  isc_task_t *task, isc_socket_t **socketp)
+{
+	isc__socketmgr_t *manager = (isc__socketmgr_t *)manager0;
+	isc__socket_t *sock = NULL;
+	isc_result_t result;
+	int lockid;
+
+	REQUIRE(VALID_MANAGER(manager));
+	REQUIRE(socketp != NULL && *socketp == NULL);
+
+	if (fd < 0 || (unsigned int)fd >= manager->maxsocks)
+		return (ISC_R_RANGE);
+
+	result = allocate_socket(manager, isc_sockettype_fdwatch, &sock);
+	if (result != ISC_R_SUCCESS)
+		return (result);
+
+	sock->fd = fd;
+	sock->fdwatcharg = cbarg;
+	sock->fdwatchcb = callback;
+	sock->fdwatchflags = flags;
+	sock->fdwatchtask = task;
+	sock->statsindex = fdwatchstatsindex;
+
+	sock->common.methods = (isc_socketmethods_t *)&socketmethods;
+	sock->references = 1;
+	*socketp = (isc_socket_t *)sock;
+
+	/*
+	 * Note we don't have to lock the socket like we normally would because
+	 * there are no external references to it yet.
+	 */
+
+	lockid = FDLOCK_ID(sock->fd);
+	LOCK(&manager->fdlock[lockid]);
+	manager->fds[sock->fd] = sock;
+	manager->fdstate[sock->fd] = MANAGED;
+#if defined(USE_EPOLL)
+	manager->epoll_events[sock->fd] = 0;
+#endif
+	UNLOCK(&manager->fdlock[lockid]);
+
+	LOCK(&manager->lock);
+	ISC_LIST_APPEND(manager->socklist, sock, link);
+#ifdef USE_SELECT
+	if (manager->maxfd < sock->fd)
+		manager->maxfd = sock->fd;
+#endif
+	UNLOCK(&manager->lock);
+
+	if (flags & ISC_SOCKFDWATCH_READ)
+		select_poke(sock->manager, sock->fd, SELECT_POKE_READ);
+	if (flags & ISC_SOCKFDWATCH_WRITE)
+		select_poke(sock->manager, sock->fd, SELECT_POKE_WRITE);
+
+	socket_log(sock, NULL, CREATION, isc_msgcat, ISC_MSGSET_SOCKET,
+		   ISC_MSG_CREATED, "fdwatch-created");
+
+	return (ISC_R_SUCCESS);
+}
+
+/*
+ * Indicate to the manager that it should watch the socket again.
+ * This can be used to restart watching if the previous event handler
+ * didn't indicate there was more data to be processed.  Primarily
+ * it is for writing but could be used for reading if desired
+ */
+
+isc_result_t
+isc__socket_fdwatchpoke(isc_socket_t *sock0, int flags)
+{
+	isc__socket_t *sock = (isc__socket_t *)sock0;
+
+	REQUIRE(VALID_SOCKET(sock));
+
+	/*
+	 * We check both flags first to allow us to get the lock
+	 * once but only if we need it.
+	 */
+
+	if ((flags & (ISC_SOCKFDWATCH_READ | ISC_SOCKFDWATCH_WRITE)) != 0) {
+		LOCK(&sock->lock);
+		if (((flags & ISC_SOCKFDWATCH_READ) != 0) &&
+		    !sock->pending_recv)
+			select_poke(sock->manager, sock->fd,
+				    SELECT_POKE_READ);
+		if (((flags & ISC_SOCKFDWATCH_WRITE) != 0) &&
+		    !sock->pending_send)
+			select_poke(sock->manager, sock->fd,
+				    SELECT_POKE_WRITE);
+		UNLOCK(&sock->lock);
+	}
+
+	socket_log(sock, NULL, TRACE, isc_msgcat, ISC_MSGSET_SOCKET,
+		   ISC_MSG_POKED, "fdwatch-poked flags: %d", flags);
+
+	return (ISC_R_SUCCESS);
+}
+
+/*
+ * Attach to a socket.  Caller must explicitly detach when it is done.
+ */
+void
+isc__socket_attach(isc_socket_t *sock0, isc_socket_t **socketp) {
+	isc__socket_t *sock = (isc__socket_t *)sock0;
+
+	REQUIRE(VALID_SOCKET(sock));
+	REQUIRE(socketp != NULL && *socketp == NULL);
+
+	LOCK(&sock->lock);
+	sock->references++;
+	UNLOCK(&sock->lock);
+
+	*socketp = (isc_socket_t *)sock;
+}
+
+/*
+ * Dereference a socket.  If this is the last reference to it, clean things
+ * up by destroying the socket.
+ */
+void
+isc__socket_detach(isc_socket_t **socketp) {
+	isc__socket_t *sock;
+	bool kill_socket = false;
+
+	REQUIRE(socketp != NULL);
+	sock = (isc__socket_t *)*socketp;
+	REQUIRE(VALID_SOCKET(sock));
+
+	LOCK(&sock->lock);
+	REQUIRE(sock->references > 0);
+	sock->references--;
+	if (sock->references == 0)
+		kill_socket = true;
+	UNLOCK(&sock->lock);
+
+	if (kill_socket)
+		destroy(&sock);
+
+	*socketp = NULL;
+}
+
+isc_result_t
+isc__socket_close(isc_socket_t *sock0) {
+	isc__socket_t *sock = (isc__socket_t *)sock0;
+	int fd;
+	isc__socketmgr_t *manager;
+
+	fflush(stdout);
+	REQUIRE(VALID_SOCKET(sock));
+
+	LOCK(&sock->lock);
+
+	REQUIRE(sock->references == 1);
+	REQUIRE(sock->type != isc_sockettype_fdwatch);
+	REQUIRE(sock->fd >= 0 && sock->fd < (int)sock->manager->maxsocks);
+
+	INSIST(!sock->connecting);
+	INSIST(!sock->pending_recv);
+	INSIST(!sock->pending_send);
+	INSIST(!sock->pending_accept);
+	INSIST(ISC_LIST_EMPTY(sock->recv_list));
+	INSIST(ISC_LIST_EMPTY(sock->send_list));
+	INSIST(ISC_LIST_EMPTY(sock->accept_list));
+	INSIST(ISC_LIST_EMPTY(sock->connect_list));
+
+	manager = sock->manager;
+	fd = sock->fd;
+	sock->fd = -1;
+	sock->dupped = 0;
+	memset(sock->name, 0, sizeof(sock->name));
+	sock->tag = NULL;
+	sock->listener = 0;
+	sock->connected = 0;
+	sock->connecting = 0;
+	sock->bound = 0;
+	isc_sockaddr_any(&sock->peer_address);
+
+	UNLOCK(&sock->lock);
+
+	socketclose(manager, sock, fd);
+
+	return (ISC_R_SUCCESS);
+}
+
+/*
+ * I/O is possible on a given socket.  Schedule an event to this task that
+ * will call an internal function to do the I/O.  This will charge the
+ * task with the I/O operation and let our select loop handler get back
+ * to doing something real as fast as possible.
+ *
+ * The socket and manager must be locked before calling this function.
+ */
+static void
+dispatch_recv(isc__socket_t *sock) {
+	intev_t *iev;
+	isc_socketevent_t *ev;
+	isc_task_t *sender;
+
+	INSIST(!sock->pending_recv);
+
+	if (sock->type != isc_sockettype_fdwatch) {
+		ev = ISC_LIST_HEAD(sock->recv_list);
+		if (ev == NULL)
+			return;
+		socket_log(sock, NULL, EVENT, NULL, 0, 0,
+			   "dispatch_recv:  event %p -> task %p",
+			   ev, ev->ev_sender);
+		sender = ev->ev_sender;
+	} else {
+		sender = sock->fdwatchtask;
+	}
+
+	sock->pending_recv = 1;
+	iev = &sock->readable_ev;
+
+	sock->references++;
+	iev->ev_sender = sock;
+	if (sock->type == isc_sockettype_fdwatch)
+		iev->ev_action = internal_fdwatch_read;
+	else
+		iev->ev_action = internal_recv;
+	iev->ev_arg = sock;
+
+	isc_task_send(sender, (isc_event_t **)&iev);
+}
+
+static void
+dispatch_send(isc__socket_t *sock) {
+	intev_t *iev;
+	isc_socketevent_t *ev;
+	isc_task_t *sender;
+
+	INSIST(!sock->pending_send);
+
+	if (sock->type != isc_sockettype_fdwatch) {
+		ev = ISC_LIST_HEAD(sock->send_list);
+		if (ev == NULL)
+			return;
+		socket_log(sock, NULL, EVENT, NULL, 0, 0,
+			   "dispatch_send:  event %p -> task %p",
+			   ev, ev->ev_sender);
+		sender = ev->ev_sender;
+	} else {
+		sender = sock->fdwatchtask;
+	}
+
+	sock->pending_send = 1;
+	iev = &sock->writable_ev;
+
+	sock->references++;
+	iev->ev_sender = sock;
+	if (sock->type == isc_sockettype_fdwatch)
+		iev->ev_action = internal_fdwatch_write;
+	else
+		iev->ev_action = internal_send;
+	iev->ev_arg = sock;
+
+	isc_task_send(sender, (isc_event_t **)&iev);
+}
+
+/*
+ * Dispatch an internal accept event.
+ */
+static void
+dispatch_accept(isc__socket_t *sock) {
+	intev_t *iev;
+	isc_socket_newconnev_t *ev;
+
+	INSIST(!sock->pending_accept);
+
+	/*
+	 * Are there any done events left, or were they all canceled
+	 * before the manager got the socket lock?
+	 */
+	ev = ISC_LIST_HEAD(sock->accept_list);
+	if (ev == NULL)
+		return;
+
+	sock->pending_accept = 1;
+	iev = &sock->readable_ev;
+
+	sock->references++;  /* keep socket around for this internal event */
+	iev->ev_sender = sock;
+	iev->ev_action = internal_accept;
+	iev->ev_arg = sock;
+
+	isc_task_send(ev->ev_sender, (isc_event_t **)&iev);
+}
+
+static void
+dispatch_connect(isc__socket_t *sock) {
+	intev_t *iev;
+	isc_socket_connev_t *ev;
+
+	iev = &sock->writable_ev;
+
+	ev = ISC_LIST_HEAD(sock->connect_list);
+	INSIST(ev != NULL); /* XXX */
+
+	INSIST(sock->connecting);
+
+	sock->references++;  /* keep socket around for this internal event */
+	iev->ev_sender = sock;
+	iev->ev_action = internal_connect;
+	iev->ev_arg = sock;
+
+	isc_task_send(ev->ev_sender, (isc_event_t **)&iev);
+}
+
+/*
+ * Dequeue an item off the given socket's read queue, set the result code
+ * in the done event to the one provided, and send it to the task it was
+ * destined for.
+ *
+ * If the event to be sent is on a list, remove it before sending.  If
+ * asked to, send and detach from the socket as well.
+ *
+ * Caller must have the socket locked if the event is attached to the socket.
+ */
+static void
+send_recvdone_event(isc__socket_t *sock, isc_socketevent_t **dev) {
+	isc_task_t *task;
+
+	task = (*dev)->ev_sender;
+
+	(*dev)->ev_sender = sock;
+
+	if (ISC_LINK_LINKED(*dev, ev_link))
+		ISC_LIST_DEQUEUE(sock->recv_list, *dev, ev_link);
+
+	if (((*dev)->attributes & ISC_SOCKEVENTATTR_ATTACHED)
+	    == ISC_SOCKEVENTATTR_ATTACHED)
+		isc_task_sendanddetach(&task, (isc_event_t **)dev);
+	else
+		isc_task_send(task, (isc_event_t **)dev);
+}
+
+/*
+ * See comments for send_recvdone_event() above.
+ *
+ * Caller must have the socket locked if the event is attached to the socket.
+ */
+static void
+send_senddone_event(isc__socket_t *sock, isc_socketevent_t **dev) {
+	isc_task_t *task;
+
+	INSIST(dev != NULL && *dev != NULL);
+
+	task = (*dev)->ev_sender;
+	(*dev)->ev_sender = sock;
+
+	if (ISC_LINK_LINKED(*dev, ev_link))
+		ISC_LIST_DEQUEUE(sock->send_list, *dev, ev_link);
+
+	if (((*dev)->attributes & ISC_SOCKEVENTATTR_ATTACHED)
+	    == ISC_SOCKEVENTATTR_ATTACHED)
+		isc_task_sendanddetach(&task, (isc_event_t **)dev);
+	else
+		isc_task_send(task, (isc_event_t **)dev);
+}
+
+/*
+ * See comments for send_recvdone_event() above.
+ *
+ * Caller must have the socket locked if the event is attached to the socket.
+ */
+static void
+send_connectdone_event(isc__socket_t *sock, isc_socket_connev_t **dev) {
+	isc_task_t *task;
+
+	INSIST(dev != NULL && *dev != NULL);
+
+	task = (*dev)->ev_sender;
+	(*dev)->ev_sender = sock;
+
+	if (ISC_LINK_LINKED(*dev, ev_link))
+		ISC_LIST_DEQUEUE(sock->connect_list, *dev, ev_link);
+
+	isc_task_sendanddetach(&task, (isc_event_t **)dev);
+}
+
+/*
+ * Call accept() on a socket, to get the new file descriptor.  The listen
+ * socket is used as a prototype to create a new isc_socket_t.  The new
+ * socket has one outstanding reference.  The task receiving the event
+ * will be detached from just after the event is delivered.
+ *
+ * On entry to this function, the event delivered is the internal
+ * readable event, and the first item on the accept_list should be
+ * the done event we want to send.  If the list is empty, this is a no-op,
+ * so just unlock and return.
+ */
+static void
+internal_accept(isc_task_t *me, isc_event_t *ev) {
+	isc__socket_t *sock;
+	isc__socketmgr_t *manager;
+	isc_socket_newconnev_t *dev;
+	isc_task_t *task;
+	ISC_SOCKADDR_LEN_T addrlen;
+	int fd;
+	isc_result_t result = ISC_R_SUCCESS;
+	char strbuf[ISC_STRERRORSIZE];
+	const char *err = "accept";
+
+	UNUSED(me);
+
+	sock = ev->ev_sender;
+	INSIST(VALID_SOCKET(sock));
+
+	LOCK(&sock->lock);
+	socket_log(sock, NULL, TRACE,
+		   isc_msgcat, ISC_MSGSET_SOCKET, ISC_MSG_ACCEPTLOCK,
+		   "internal_accept called, locked socket");
+
+	manager = sock->manager;
+	INSIST(VALID_MANAGER(manager));
+
+	INSIST(sock->listener);
+	INSIST(sock->pending_accept == 1);
+	sock->pending_accept = 0;
+
+	INSIST(sock->references > 0);
+	sock->references--;  /* the internal event is done with this socket */
+	if (sock->references == 0) {
+		UNLOCK(&sock->lock);
+		destroy(&sock);
+		return;
+	}
+
+	/*
+	 * Get the first item off the accept list.
+	 * If it is empty, unlock the socket and return.
+	 */
+	dev = ISC_LIST_HEAD(sock->accept_list);
+	if (dev == NULL) {
+		UNLOCK(&sock->lock);
+		return;
+	}
+
+	/*
+	 * Try to accept the new connection.  If the accept fails with
+	 * EAGAIN or EINTR, simply poke the watcher to watch this socket
+	 * again.  Also ignore ECONNRESET, which has been reported to
+	 * be spuriously returned on Linux 2.2.19 although it is not
+	 * a documented error for accept().  ECONNABORTED has been
+	 * reported for Solaris 8.  The rest are thrown in not because
+	 * we have seen them but because they are ignored by other
+	 * daemons such as BIND 8 and Apache.
+	 */
+
+	addrlen = sizeof(NEWCONNSOCK(dev)->peer_address.type);
+	memset(&NEWCONNSOCK(dev)->peer_address.type, 0, addrlen);
+	fd = accept(sock->fd, &NEWCONNSOCK(dev)->peer_address.type.sa,
+		    (void *)&addrlen);
+
+#ifdef F_DUPFD
+	/*
+	 * Leave a space for stdio to work in.
+	 */
+	if (fd >= 0 && fd < 20) {
+		int newfd, tmp;
+		newfd = fcntl(fd, F_DUPFD, 20);
+		tmp = errno;
+		(void)close(fd);
+		errno = tmp;
+		fd = newfd;
+		err = "accept/fcntl";
+	}
+#endif
+
+	if (fd < 0) {
+		if (SOFT_ERROR(errno))
+			goto soft_error;
+		switch (errno) {
+		case ENFILE:
+		case EMFILE:
+			isc_log_iwrite(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+				       ISC_LOGMODULE_SOCKET, ISC_LOG_ERROR,
+				       isc_msgcat, ISC_MSGSET_SOCKET,
+				       ISC_MSG_TOOMANYFDS,
+				       "%s: too many open file descriptors",
+				       err);
+			goto soft_error;
+
+		case ENOBUFS:
+		case ENOMEM:
+		case ECONNRESET:
+		case ECONNABORTED:
+		case EHOSTUNREACH:
+		case EHOSTDOWN:
+		case ENETUNREACH:
+		case ENETDOWN:
+		case ECONNREFUSED:
+#ifdef EPROTO
+		case EPROTO:
+#endif
+#ifdef ENONET
+		case ENONET:
+#endif
+			goto soft_error;
+		default:
+			break;
+		}
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 "internal_accept: %s() %s: %s", err,
+				 isc_msgcat_get(isc_msgcat,
+						ISC_MSGSET_GENERAL,
+						ISC_MSG_FAILED,
+						"failed"),
+				 strbuf);
+		fd = -1;
+		result = ISC_R_UNEXPECTED;
+	} else {
+		if (addrlen == 0U) {
+			UNEXPECTED_ERROR(__FILE__, __LINE__,
+					 "internal_accept(): "
+					 "accept() failed to return "
+					 "remote address");
+
+			(void)close(fd);
+			goto soft_error;
+		} else if (NEWCONNSOCK(dev)->peer_address.type.sa.sa_family !=
+			   sock->pf)
+		{
+			UNEXPECTED_ERROR(__FILE__, __LINE__,
+					 "internal_accept(): "
+					 "accept() returned peer address "
+					 "family %u (expected %u)",
+					 NEWCONNSOCK(dev)->peer_address.
+					 type.sa.sa_family,
+					 sock->pf);
+			(void)close(fd);
+			goto soft_error;
+		} else if (fd >= (int)manager->maxsocks) {
+			isc_log_iwrite(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+				       ISC_LOGMODULE_SOCKET, ISC_LOG_ERROR,
+				       isc_msgcat, ISC_MSGSET_SOCKET,
+				       ISC_MSG_TOOMANYFDS,
+				       "accept: "
+				       "file descriptor exceeds limit (%d/%u)",
+				       fd, manager->maxsocks);
+			(void)close(fd);
+			goto soft_error;
+		}
+	}
+
+	if (fd != -1) {
+		NEWCONNSOCK(dev)->peer_address.length = addrlen;
+		NEWCONNSOCK(dev)->pf = sock->pf;
+	}
+
+	/*
+	 * Pull off the done event.
+	 */
+	ISC_LIST_UNLINK(sock->accept_list, dev, ev_link);
+
+	/*
+	 * Poke watcher if there are more pending accepts.
+	 */
+	if (!ISC_LIST_EMPTY(sock->accept_list))
+		select_poke(sock->manager, sock->fd, SELECT_POKE_ACCEPT);
+
+	UNLOCK(&sock->lock);
+
+	if (fd != -1) {
+		result = make_nonblock(fd);
+		if (result != ISC_R_SUCCESS) {
+			(void)close(fd);
+			fd = -1;
+		}
+	}
+
+	/*
+	 * -1 means the new socket didn't happen.
+	 */
+	if (fd != -1) {
+		int lockid = FDLOCK_ID(fd);
+
+		NEWCONNSOCK(dev)->fd = fd;
+		NEWCONNSOCK(dev)->bound = 1;
+		NEWCONNSOCK(dev)->connected = 1;
+
+		/*
+		 * Use minimum mtu if possible.
+		 */
+		use_min_mtu(NEWCONNSOCK(dev));
+		set_tcp_maxseg(NEWCONNSOCK(dev), 1280 - 20 - 40);
+
+		/*
+		 * Ensure DSCP settings are inherited across accept.
+		 */
+		setdscp(NEWCONNSOCK(dev), sock->dscp);
+
+		/*
+		 * Save away the remote address
+		 */
+		dev->address = NEWCONNSOCK(dev)->peer_address;
+
+		if (NEWCONNSOCK(dev)->active == 0) {
+			inc_stats(manager->stats,
+				  NEWCONNSOCK(dev)->statsindex[STATID_ACTIVE]);
+			NEWCONNSOCK(dev)->active = 1;
+		}
+
+		LOCK(&manager->fdlock[lockid]);
+		manager->fds[fd] = NEWCONNSOCK(dev);
+		manager->fdstate[fd] = MANAGED;
+#if defined(USE_EPOLL)
+		manager->epoll_events[fd] = 0;
+#endif
+		UNLOCK(&manager->fdlock[lockid]);
+
+		LOCK(&manager->lock);
+
+#ifdef USE_SELECT
+		if (manager->maxfd < fd)
+			manager->maxfd = fd;
+#endif
+
+		socket_log(sock, &NEWCONNSOCK(dev)->peer_address, CREATION,
+			   isc_msgcat, ISC_MSGSET_SOCKET, ISC_MSG_ACCEPTEDCXN,
+			   "accepted connection, new socket %p",
+			   dev->newsocket);
+
+		ISC_LIST_APPEND(manager->socklist, NEWCONNSOCK(dev), link);
+
+		UNLOCK(&manager->lock);
+
+		inc_stats(manager->stats, sock->statsindex[STATID_ACCEPT]);
+	} else {
+		inc_stats(manager->stats, sock->statsindex[STATID_ACCEPTFAIL]);
+		NEWCONNSOCK(dev)->references--;
+		free_socket((isc__socket_t **)&dev->newsocket);
+	}
+
+	/*
+	 * Fill in the done event details and send it off.
+	 */
+	dev->result = result;
+	task = dev->ev_sender;
+	dev->ev_sender = sock;
+
+	isc_task_sendanddetach(&task, ISC_EVENT_PTR(&dev));
+	return;
+
+ soft_error:
+	select_poke(sock->manager, sock->fd, SELECT_POKE_ACCEPT);
+	UNLOCK(&sock->lock);
+
+	inc_stats(manager->stats, sock->statsindex[STATID_ACCEPTFAIL]);
+	return;
+}
+
+static void
+internal_recv(isc_task_t *me, isc_event_t *ev) {
+	isc_socketevent_t *dev;
+	isc__socket_t *sock;
+
+	INSIST(ev->ev_type == ISC_SOCKEVENT_INTR);
+
+	sock = ev->ev_sender;
+	INSIST(VALID_SOCKET(sock));
+
+	LOCK(&sock->lock);
+	socket_log(sock, NULL, IOEVENT,
+		   isc_msgcat, ISC_MSGSET_SOCKET, ISC_MSG_INTERNALRECV,
+		   "internal_recv: task %p got event %p", me, ev);
+
+	INSIST(sock->pending_recv == 1);
+	sock->pending_recv = 0;
+
+	INSIST(sock->references > 0);
+	sock->references--;  /* the internal event is done with this socket */
+	if (sock->references == 0) {
+		UNLOCK(&sock->lock);
+		destroy(&sock);
+		return;
+	}
+
+	/*
+	 * Try to do as much I/O as possible on this socket.  There are no
+	 * limits here, currently.
+	 */
+	dev = ISC_LIST_HEAD(sock->recv_list);
+	while (dev != NULL) {
+		switch (doio_recv(sock, dev)) {
+		case DOIO_SOFT:
+			goto poke;
+
+		case DOIO_EOF:
+			/*
+			 * read of 0 means the remote end was closed.
+			 * Run through the event queue and dispatch all
+			 * the events with an EOF result code.
+			 */
+			do {
+				dev->result = ISC_R_EOF;
+				send_recvdone_event(sock, &dev);
+				dev = ISC_LIST_HEAD(sock->recv_list);
+			} while (dev != NULL);
+			goto poke;
+
+		case DOIO_SUCCESS:
+		case DOIO_HARD:
+			send_recvdone_event(sock, &dev);
+			break;
+		}
+
+		dev = ISC_LIST_HEAD(sock->recv_list);
+	}
+
+ poke:
+	if (!ISC_LIST_EMPTY(sock->recv_list))
+		select_poke(sock->manager, sock->fd, SELECT_POKE_READ);
+
+	UNLOCK(&sock->lock);
+}
+
+static void
+internal_send(isc_task_t *me, isc_event_t *ev) {
+	isc_socketevent_t *dev;
+	isc__socket_t *sock;
+
+	INSIST(ev->ev_type == ISC_SOCKEVENT_INTW);
+
+	/*
+	 * Find out what socket this is and lock it.
+	 */
+	sock = (isc__socket_t *)ev->ev_sender;
+	INSIST(VALID_SOCKET(sock));
+
+	LOCK(&sock->lock);
+	socket_log(sock, NULL, IOEVENT,
+		   isc_msgcat, ISC_MSGSET_SOCKET, ISC_MSG_INTERNALSEND,
+		   "internal_send: task %p got event %p", me, ev);
+
+	INSIST(sock->pending_send == 1);
+	sock->pending_send = 0;
+
+	INSIST(sock->references > 0);
+	sock->references--;  /* the internal event is done with this socket */
+	if (sock->references == 0) {
+		UNLOCK(&sock->lock);
+		destroy(&sock);
+		return;
+	}
+
+	/*
+	 * Try to do as much I/O as possible on this socket.  There are no
+	 * limits here, currently.
+	 */
+	dev = ISC_LIST_HEAD(sock->send_list);
+	while (dev != NULL) {
+		switch (doio_send(sock, dev)) {
+		case DOIO_SOFT:
+			goto poke;
+
+		case DOIO_HARD:
+		case DOIO_SUCCESS:
+			send_senddone_event(sock, &dev);
+			break;
+		}
+
+		dev = ISC_LIST_HEAD(sock->send_list);
+	}
+
+ poke:
+	if (!ISC_LIST_EMPTY(sock->send_list))
+		select_poke(sock->manager, sock->fd, SELECT_POKE_WRITE);
+
+	UNLOCK(&sock->lock);
+}
+
+static void
+internal_fdwatch_write(isc_task_t *me, isc_event_t *ev) {
+	isc__socket_t *sock;
+	int more_data;
+
+	INSIST(ev->ev_type == ISC_SOCKEVENT_INTW);
+
+	/*
+	 * Find out what socket this is and lock it.
+	 */
+	sock = (isc__socket_t *)ev->ev_sender;
+	INSIST(VALID_SOCKET(sock));
+
+	LOCK(&sock->lock);
+	socket_log(sock, NULL, IOEVENT,
+		   isc_msgcat, ISC_MSGSET_SOCKET, ISC_MSG_INTERNALSEND,
+		   "internal_fdwatch_write: task %p got event %p", me, ev);
+
+	INSIST(sock->pending_send == 1);
+
+	UNLOCK(&sock->lock);
+	more_data = (sock->fdwatchcb)(me, (isc_socket_t *)sock,
+				      sock->fdwatcharg, ISC_SOCKFDWATCH_WRITE);
+	LOCK(&sock->lock);
+
+	sock->pending_send = 0;
+
+	INSIST(sock->references > 0);
+	sock->references--;  /* the internal event is done with this socket */
+	if (sock->references == 0) {
+		UNLOCK(&sock->lock);
+		destroy(&sock);
+		return;
+	}
+
+	if (more_data)
+		select_poke(sock->manager, sock->fd, SELECT_POKE_WRITE);
+
+	UNLOCK(&sock->lock);
+}
+
+static void
+internal_fdwatch_read(isc_task_t *me, isc_event_t *ev) {
+	isc__socket_t *sock;
+	int more_data;
+
+	INSIST(ev->ev_type == ISC_SOCKEVENT_INTR);
+
+	/*
+	 * Find out what socket this is and lock it.
+	 */
+	sock = (isc__socket_t *)ev->ev_sender;
+	INSIST(VALID_SOCKET(sock));
+
+	LOCK(&sock->lock);
+	socket_log(sock, NULL, IOEVENT,
+		   isc_msgcat, ISC_MSGSET_SOCKET, ISC_MSG_INTERNALRECV,
+		   "internal_fdwatch_read: task %p got event %p", me, ev);
+
+	INSIST(sock->pending_recv == 1);
+
+	UNLOCK(&sock->lock);
+	more_data = (sock->fdwatchcb)(me, (isc_socket_t *)sock,
+				      sock->fdwatcharg, ISC_SOCKFDWATCH_READ);
+	LOCK(&sock->lock);
+
+	sock->pending_recv = 0;
+
+	INSIST(sock->references > 0);
+	sock->references--;  /* the internal event is done with this socket */
+	if (sock->references == 0) {
+		UNLOCK(&sock->lock);
+		destroy(&sock);
+		return;
+	}
+
+	if (more_data)
+		select_poke(sock->manager, sock->fd, SELECT_POKE_READ);
+
+	UNLOCK(&sock->lock);
+}
+
+/*
+ * Process read/writes on each fd here.  Avoid locking
+ * and unlocking twice if both reads and writes are possible.
+ */
+static void
+process_fd(isc__socketmgr_t *manager, int fd, bool readable,
+	   bool writeable)
+{
+	isc__socket_t *sock;
+	bool unlock_sock;
+	bool unwatch_read = false, unwatch_write = false;
+	int lockid = FDLOCK_ID(fd);
+
+	/*
+	 * If the socket is going to be closed, don't do more I/O.
+	 */
+	LOCK(&manager->fdlock[lockid]);
+	if (manager->fdstate[fd] == CLOSE_PENDING) {
+		UNLOCK(&manager->fdlock[lockid]);
+
+		(void)unwatch_fd(manager, fd, SELECT_POKE_READ);
+		(void)unwatch_fd(manager, fd, SELECT_POKE_WRITE);
+		return;
+	}
+
+	sock = manager->fds[fd];
+	unlock_sock = false;
+	if (readable) {
+		if (sock == NULL) {
+			unwatch_read = true;
+			goto check_write;
+		}
+		unlock_sock = true;
+		LOCK(&sock->lock);
+		if (!SOCK_DEAD(sock)) {
+			if (sock->listener)
+				dispatch_accept(sock);
+			else
+				dispatch_recv(sock);
+		}
+		unwatch_read = true;
+	}
+check_write:
+	if (writeable) {
+		if (sock == NULL) {
+			unwatch_write = true;
+			goto unlock_fd;
+		}
+		if (!unlock_sock) {
+			unlock_sock = true;
+			LOCK(&sock->lock);
+		}
+		if (!SOCK_DEAD(sock)) {
+			if (sock->connecting)
+				dispatch_connect(sock);
+			else
+				dispatch_send(sock);
+		}
+		unwatch_write = true;
+	}
+	if (unlock_sock)
+		UNLOCK(&sock->lock);
+
+ unlock_fd:
+	UNLOCK(&manager->fdlock[lockid]);
+	if (unwatch_read)
+		(void)unwatch_fd(manager, fd, SELECT_POKE_READ);
+	if (unwatch_write)
+		(void)unwatch_fd(manager, fd, SELECT_POKE_WRITE);
+
+}
+
+#ifdef USE_KQUEUE
+static bool
+process_fds(isc__socketmgr_t *manager, struct kevent *events, int nevents) {
+	int i;
+	bool readable, writable;
+	bool done = false;
+#ifdef USE_WATCHER_THREAD
+	bool have_ctlevent = false;
+#endif
+
+	if (nevents == manager->nevents) {
+		/*
+		 * This is not an error, but something unexpected.  If this
+		 * happens, it may indicate the need for increasing
+		 * ISC_SOCKET_MAXEVENTS.
+		 */
+		manager_log(manager, ISC_LOGCATEGORY_GENERAL,
+			    ISC_LOGMODULE_SOCKET, ISC_LOG_INFO,
+			    "maximum number of FD events (%d) received",
+			    nevents);
+	}
+
+	for (i = 0; i < nevents; i++) {
+		REQUIRE(events[i].ident < manager->maxsocks);
+#ifdef USE_WATCHER_THREAD
+		if (events[i].ident == (uintptr_t)manager->pipe_fds[0]) {
+			have_ctlevent = true;
+			continue;
+		}
+#endif
+		readable = (events[i].filter == EVFILT_READ);
+		writable = (events[i].filter == EVFILT_WRITE);
+		process_fd(manager, events[i].ident, readable, writable);
+	}
+
+#ifdef USE_WATCHER_THREAD
+	if (have_ctlevent)
+		done = process_ctlfd(manager);
+#endif
+
+	return (done);
+}
+#elif defined(USE_EPOLL)
+static bool
+process_fds(isc__socketmgr_t *manager, struct epoll_event *events, int nevents)
+{
+	int i;
+	bool done = false;
+#ifdef USE_WATCHER_THREAD
+	bool have_ctlevent = false;
+#endif
+
+	if (nevents == manager->nevents) {
+		manager_log(manager, ISC_LOGCATEGORY_GENERAL,
+			    ISC_LOGMODULE_SOCKET, ISC_LOG_INFO,
+			    "maximum number of FD events (%d) received",
+			    nevents);
+	}
+
+	for (i = 0; i < nevents; i++) {
+		REQUIRE(events[i].data.fd < (int)manager->maxsocks);
+#ifdef USE_WATCHER_THREAD
+		if (events[i].data.fd == manager->pipe_fds[0]) {
+			have_ctlevent = true;
+			continue;
+		}
+#endif
+		if ((events[i].events & EPOLLERR) != 0 ||
+		    (events[i].events & EPOLLHUP) != 0) {
+			/*
+			 * epoll does not set IN/OUT bits on an erroneous
+			 * condition, so we need to try both anyway.  This is a
+			 * bit inefficient, but should be okay for such rare
+			 * events.  Note also that the read or write attempt
+			 * won't block because we use non-blocking sockets.
+			 */
+			int fd = events[i].data.fd;
+			events[i].events |= manager->epoll_events[fd];
+		}
+		process_fd(manager, events[i].data.fd,
+			   (events[i].events & EPOLLIN) != 0,
+			   (events[i].events & EPOLLOUT) != 0);
+	}
+
+#ifdef USE_WATCHER_THREAD
+	if (have_ctlevent)
+		done = process_ctlfd(manager);
+#endif
+
+	return (done);
+}
+#elif defined(USE_DEVPOLL)
+static bool
+process_fds(isc__socketmgr_t *manager, struct pollfd *events, int nevents) {
+	int i;
+	bool done = false;
+#ifdef USE_WATCHER_THREAD
+	bool have_ctlevent = false;
+#endif
+
+	if (nevents == manager->nevents) {
+		manager_log(manager, ISC_LOGCATEGORY_GENERAL,
+			    ISC_LOGMODULE_SOCKET, ISC_LOG_INFO,
+			    "maximum number of FD events (%d) received",
+			    nevents);
+	}
+
+	for (i = 0; i < nevents; i++) {
+		REQUIRE(events[i].fd < (int)manager->maxsocks);
+#ifdef USE_WATCHER_THREAD
+		if (events[i].fd == manager->pipe_fds[0]) {
+			have_ctlevent = true;
+			continue;
+		}
+#endif
+		process_fd(manager, events[i].fd,
+			   (events[i].events & POLLIN) != 0,
+			   (events[i].events & POLLOUT) != 0);
+	}
+
+#ifdef USE_WATCHER_THREAD
+	if (have_ctlevent)
+		done = process_ctlfd(manager);
+#endif
+
+	return (done);
+}
+#elif defined(USE_SELECT)
+static void
+process_fds(isc__socketmgr_t *manager, int maxfd, fd_set *readfds,
+	    fd_set *writefds)
+{
+	int i;
+
+	REQUIRE(maxfd <= (int)manager->maxsocks);
+
+	for (i = 0; i < maxfd; i++) {
+#ifdef USE_WATCHER_THREAD
+		if (i == manager->pipe_fds[0] || i == manager->pipe_fds[1])
+			continue;
+#endif /* USE_WATCHER_THREAD */
+		process_fd(manager, i, FD_ISSET(i, readfds),
+			   FD_ISSET(i, writefds));
+	}
+}
+#endif
+
+#ifdef USE_WATCHER_THREAD
+static bool
+process_ctlfd(isc__socketmgr_t *manager) {
+	int msg, fd;
+
+	for (;;) {
+		select_readmsg(manager, &fd, &msg);
+
+		manager_log(manager, IOEVENT,
+			    isc_msgcat_get(isc_msgcat, ISC_MSGSET_SOCKET,
+					   ISC_MSG_WATCHERMSG,
+					   "watcher got message %d "
+					   "for socket %d"), msg, fd);
+
+		/*
+		 * Nothing to read?
+		 */
+		if (msg == SELECT_POKE_NOTHING)
+			break;
+
+		/*
+		 * Handle shutdown message.  We really should
+		 * jump out of this loop right away, but
+		 * it doesn't matter if we have to do a little
+		 * more work first.
+		 */
+		if (msg == SELECT_POKE_SHUTDOWN)
+			return (true);
+
+		/*
+		 * This is a wakeup on a socket.  Look
+		 * at the event queue for both read and write,
+		 * and decide if we need to watch on it now
+		 * or not.
+		 */
+		wakeup_socket(manager, fd, msg);
+	}
+
+	return (false);
+}
+
+/*
+ * This is the thread that will loop forever, always in a select or poll
+ * call.
+ *
+ * When select returns something to do, track down what thread gets to do
+ * this I/O and post the event to it.
+ */
+static isc_threadresult_t
+watcher(void *uap) {
+	isc__socketmgr_t *manager = uap;
+	bool done;
+	int cc;
+#ifdef USE_KQUEUE
+	const char *fnname = "kevent()";
+#elif defined (USE_EPOLL)
+	const char *fnname = "epoll_wait()";
+#elif defined(USE_DEVPOLL)
+	isc_result_t result;
+	const char *fnname = "ioctl(DP_POLL)";
+	struct dvpoll dvp;
+	int pass;
+#if defined(ISC_SOCKET_USE_POLLWATCH)
+	pollstate_t pollstate = poll_idle;
+#endif
+#elif defined (USE_SELECT)
+	const char *fnname = "select()";
+	int maxfd;
+	int ctlfd;
+#endif
+	char strbuf[ISC_STRERRORSIZE];
+
+#if defined (USE_SELECT)
+	/*
+	 * Get the control fd here.  This will never change.
+	 */
+	ctlfd = manager->pipe_fds[0];
+#endif
+	done = false;
+	while (!done) {
+		do {
+#ifdef USE_KQUEUE
+			cc = kevent(manager->kqueue_fd, NULL, 0,
+				    manager->events, manager->nevents, NULL);
+#elif defined(USE_EPOLL)
+			cc = epoll_wait(manager->epoll_fd, manager->events,
+					manager->nevents, -1);
+#elif defined(USE_DEVPOLL)
+			/*
+			 * Re-probe every thousand calls.
+			 */
+			if (manager->calls++ > 1000U) {
+				result = isc_resource_getcurlimit(
+							isc_resource_openfiles,
+							&manager->open_max);
+				if (result != ISC_R_SUCCESS)
+					manager->open_max = 64;
+				manager->calls = 0;
+			}
+			for (pass = 0; pass < 2; pass++) {
+				dvp.dp_fds = manager->events;
+				dvp.dp_nfds = manager->nevents;
+				if (dvp.dp_nfds >= manager->open_max)
+					dvp.dp_nfds = manager->open_max - 1;
+#ifndef ISC_SOCKET_USE_POLLWATCH
+				dvp.dp_timeout = -1;
+#else
+				if (pollstate == poll_idle)
+					dvp.dp_timeout = -1;
+				else
+					dvp.dp_timeout =
+						 ISC_SOCKET_POLLWATCH_TIMEOUT;
+#endif	/* ISC_SOCKET_USE_POLLWATCH */
+				cc = ioctl(manager->devpoll_fd, DP_POLL, &dvp);
+				if (cc == -1 && errno == EINVAL) {
+					/*
+					 * {OPEN_MAX} may have dropped.  Look
+					 * up the current value and try again.
+					 */
+					result = isc_resource_getcurlimit(
+							isc_resource_openfiles,
+							&manager->open_max);
+					if (result != ISC_R_SUCCESS)
+						manager->open_max = 64;
+				} else
+					break;
+			}
+#elif defined(USE_SELECT)
+			LOCK(&manager->lock);
+			memmove(manager->read_fds_copy, manager->read_fds,
+				manager->fd_bufsize);
+			memmove(manager->write_fds_copy, manager->write_fds,
+				manager->fd_bufsize);
+			maxfd = manager->maxfd + 1;
+			UNLOCK(&manager->lock);
+
+			cc = select(maxfd, manager->read_fds_copy,
+				    manager->write_fds_copy, NULL, NULL);
+#endif	/* USE_KQUEUE */
+
+			if (cc < 0 && !SOFT_ERROR(errno)) {
+				isc__strerror(errno, strbuf, sizeof(strbuf));
+				FATAL_ERROR(__FILE__, __LINE__,
+					    "%s %s: %s", fnname,
+					    isc_msgcat_get(isc_msgcat,
+							   ISC_MSGSET_GENERAL,
+							   ISC_MSG_FAILED,
+							   "failed"), strbuf);
+			}
+
+#if defined(USE_DEVPOLL) && defined(ISC_SOCKET_USE_POLLWATCH)
+			if (cc == 0) {
+				if (pollstate == poll_active)
+					pollstate = poll_checking;
+				else if (pollstate == poll_checking)
+					pollstate = poll_idle;
+			} else if (cc > 0) {
+				if (pollstate == poll_checking) {
+					/*
+					 * XXX: We'd like to use a more
+					 * verbose log level as it's actually an
+					 * unexpected event, but the kernel bug
+					 * reportedly happens pretty frequently
+					 * (and it can also be a false positive)
+					 * so it would be just too noisy.
+					 */
+					manager_log(manager,
+						    ISC_LOGCATEGORY_GENERAL,
+						    ISC_LOGMODULE_SOCKET,
+						    ISC_LOG_DEBUG(1),
+						    "unexpected POLL timeout");
+				}
+				pollstate = poll_active;
+			}
+#endif
+		} while (cc < 0);
+
+#if defined(USE_KQUEUE) || defined (USE_EPOLL) || defined (USE_DEVPOLL)
+		done = process_fds(manager, manager->events, cc);
+#elif defined(USE_SELECT)
+		process_fds(manager, maxfd, manager->read_fds_copy,
+			    manager->write_fds_copy);
+
+		/*
+		 * Process reads on internal, control fd.
+		 */
+		if (FD_ISSET(ctlfd, manager->read_fds_copy))
+			done = process_ctlfd(manager);
+#endif
+	}
+
+	manager_log(manager, TRACE, "%s",
+		    isc_msgcat_get(isc_msgcat, ISC_MSGSET_GENERAL,
+				   ISC_MSG_EXITING, "watcher exiting"));
+
+	return ((isc_threadresult_t)0);
+}
+#endif /* USE_WATCHER_THREAD */
+
+void
+isc__socketmgr_setreserved(isc_socketmgr_t *manager0, uint32_t reserved) {
+	isc__socketmgr_t *manager = (isc__socketmgr_t *)manager0;
+
+	REQUIRE(VALID_MANAGER(manager));
+
+	manager->reserved = reserved;
+}
+
+void
+isc__socketmgr_maxudp(isc_socketmgr_t *manager0, int maxudp) {
+	isc__socketmgr_t *manager = (isc__socketmgr_t *)manager0;
+
+	REQUIRE(VALID_MANAGER(manager));
+
+	manager->maxudp = maxudp;
+}
+
+/*
+ * Create a new socket manager.
+ */
+
+static isc_result_t
+setup_watcher(isc_mem_t *mctx, isc__socketmgr_t *manager) {
+	isc_result_t result;
+#if defined(USE_KQUEUE) || defined(USE_EPOLL) || defined(USE_DEVPOLL)
+	char strbuf[ISC_STRERRORSIZE];
+#endif
+
+#ifdef USE_KQUEUE
+	manager->nevents = ISC_SOCKET_MAXEVENTS;
+	manager->events = isc_mem_get(mctx, sizeof(struct kevent) *
+				      manager->nevents);
+	if (manager->events == NULL)
+		return (ISC_R_NOMEMORY);
+	manager->kqueue_fd = kqueue();
+	if (manager->kqueue_fd == -1) {
+		result = isc__errno2result(errno);
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 "kqueue %s: %s",
+				 isc_msgcat_get(isc_msgcat, ISC_MSGSET_GENERAL,
+						ISC_MSG_FAILED, "failed"),
+				 strbuf);
+		isc_mem_put(mctx, manager->events,
+			    sizeof(struct kevent) * manager->nevents);
+		return (result);
+	}
+
+#ifdef USE_WATCHER_THREAD
+	result = watch_fd(manager, manager->pipe_fds[0], SELECT_POKE_READ);
+	if (result != ISC_R_SUCCESS) {
+		close(manager->kqueue_fd);
+		isc_mem_put(mctx, manager->events,
+			    sizeof(struct kevent) * manager->nevents);
+		return (result);
+	}
+#endif	/* USE_WATCHER_THREAD */
+#elif defined(USE_EPOLL)
+	manager->nevents = ISC_SOCKET_MAXEVENTS;
+	manager->events = isc_mem_get(mctx, sizeof(struct epoll_event) *
+				      manager->nevents);
+	if (manager->events == NULL)
+		return (ISC_R_NOMEMORY);
+	manager->epoll_fd = epoll_create(manager->nevents);
+	if (manager->epoll_fd == -1) {
+		result = isc__errno2result(errno);
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 "epoll_create %s: %s",
+				 isc_msgcat_get(isc_msgcat, ISC_MSGSET_GENERAL,
+						ISC_MSG_FAILED, "failed"),
+				 strbuf);
+		isc_mem_put(mctx, manager->events,
+			    sizeof(struct epoll_event) * manager->nevents);
+		return (result);
+	}
+#ifdef USE_WATCHER_THREAD
+	result = watch_fd(manager, manager->pipe_fds[0], SELECT_POKE_READ);
+	if (result != ISC_R_SUCCESS) {
+		close(manager->epoll_fd);
+		isc_mem_put(mctx, manager->events,
+			    sizeof(struct epoll_event) * manager->nevents);
+		return (result);
+	}
+#endif	/* USE_WATCHER_THREAD */
+#elif defined(USE_DEVPOLL)
+	manager->nevents = ISC_SOCKET_MAXEVENTS;
+	result = isc_resource_getcurlimit(isc_resource_openfiles,
+					  &manager->open_max);
+	if (result != ISC_R_SUCCESS)
+		manager->open_max = 64;
+	manager->calls = 0;
+	manager->events = isc_mem_get(mctx, sizeof(struct pollfd) *
+				      manager->nevents);
+	if (manager->events == NULL)
+		return (ISC_R_NOMEMORY);
+	/*
+	 * Note: fdpollinfo should be able to support all possible FDs, so
+	 * it must have maxsocks entries (not nevents).
+	 */
+	manager->fdpollinfo = isc_mem_get(mctx, sizeof(pollinfo_t) *
+					  manager->maxsocks);
+	if (manager->fdpollinfo == NULL) {
+		isc_mem_put(mctx, manager->events,
+			    sizeof(struct pollfd) * manager->nevents);
+		return (ISC_R_NOMEMORY);
+	}
+	memset(manager->fdpollinfo, 0, sizeof(pollinfo_t) * manager->maxsocks);
+	manager->devpoll_fd = open("/dev/poll", O_RDWR);
+	if (manager->devpoll_fd == -1) {
+		result = isc__errno2result(errno);
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 "open(/dev/poll) %s: %s",
+				 isc_msgcat_get(isc_msgcat, ISC_MSGSET_GENERAL,
+						ISC_MSG_FAILED, "failed"),
+				 strbuf);
+		isc_mem_put(mctx, manager->events,
+			    sizeof(struct pollfd) * manager->nevents);
+		isc_mem_put(mctx, manager->fdpollinfo,
+			    sizeof(pollinfo_t) * manager->maxsocks);
+		return (result);
+	}
+#ifdef USE_WATCHER_THREAD
+	result = watch_fd(manager, manager->pipe_fds[0], SELECT_POKE_READ);
+	if (result != ISC_R_SUCCESS) {
+		close(manager->devpoll_fd);
+		isc_mem_put(mctx, manager->events,
+			    sizeof(struct pollfd) * manager->nevents);
+		isc_mem_put(mctx, manager->fdpollinfo,
+			    sizeof(pollinfo_t) * manager->maxsocks);
+		return (result);
+	}
+#endif	/* USE_WATCHER_THREAD */
+#elif defined(USE_SELECT)
+	UNUSED(result);
+
+#if ISC_SOCKET_MAXSOCKETS > FD_SETSIZE
+	/*
+	 * Note: this code should also cover the case of MAXSOCKETS <=
+	 * FD_SETSIZE, but we separate the cases to avoid possible portability
+	 * issues regarding howmany() and the actual representation of fd_set.
+	 */
+	manager->fd_bufsize = howmany(manager->maxsocks, NFDBITS) *
+		sizeof(fd_mask);
+#else
+	manager->fd_bufsize = sizeof(fd_set);
+#endif
+
+	manager->read_fds = NULL;
+	manager->read_fds_copy = NULL;
+	manager->write_fds = NULL;
+	manager->write_fds_copy = NULL;
+
+	manager->read_fds = isc_mem_get(mctx, manager->fd_bufsize);
+	if (manager->read_fds != NULL)
+		manager->read_fds_copy = isc_mem_get(mctx, manager->fd_bufsize);
+	if (manager->read_fds_copy != NULL)
+		manager->write_fds = isc_mem_get(mctx, manager->fd_bufsize);
+	if (manager->write_fds != NULL) {
+		manager->write_fds_copy = isc_mem_get(mctx,
+						      manager->fd_bufsize);
+	}
+	if (manager->write_fds_copy == NULL) {
+		if (manager->write_fds != NULL) {
+			isc_mem_put(mctx, manager->write_fds,
+				    manager->fd_bufsize);
+		}
+		if (manager->read_fds_copy != NULL) {
+			isc_mem_put(mctx, manager->read_fds_copy,
+				    manager->fd_bufsize);
+		}
+		if (manager->read_fds != NULL) {
+			isc_mem_put(mctx, manager->read_fds,
+				    manager->fd_bufsize);
+		}
+		return (ISC_R_NOMEMORY);
+	}
+	memset(manager->read_fds, 0, manager->fd_bufsize);
+	memset(manager->write_fds, 0, manager->fd_bufsize);
+
+#ifdef USE_WATCHER_THREAD
+	(void)watch_fd(manager, manager->pipe_fds[0], SELECT_POKE_READ);
+	manager->maxfd = manager->pipe_fds[0];
+#else /* USE_WATCHER_THREAD */
+	manager->maxfd = 0;
+#endif /* USE_WATCHER_THREAD */
+#endif	/* USE_KQUEUE */
+
+	return (ISC_R_SUCCESS);
+}
+
+static void
+cleanup_watcher(isc_mem_t *mctx, isc__socketmgr_t *manager) {
+#ifdef USE_WATCHER_THREAD
+	isc_result_t result;
+
+	result = unwatch_fd(manager, manager->pipe_fds[0], SELECT_POKE_READ);
+	if (result != ISC_R_SUCCESS) {
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 "epoll_ctl(DEL) %s",
+				 isc_msgcat_get(isc_msgcat, ISC_MSGSET_GENERAL,
+						ISC_MSG_FAILED, "failed"));
+	}
+#endif	/* USE_WATCHER_THREAD */
+
+#ifdef USE_KQUEUE
+	close(manager->kqueue_fd);
+	isc_mem_put(mctx, manager->events,
+		    sizeof(struct kevent) * manager->nevents);
+#elif defined(USE_EPOLL)
+	close(manager->epoll_fd);
+	isc_mem_put(mctx, manager->events,
+		    sizeof(struct epoll_event) * manager->nevents);
+#elif defined(USE_DEVPOLL)
+	close(manager->devpoll_fd);
+	isc_mem_put(mctx, manager->events,
+		    sizeof(struct pollfd) * manager->nevents);
+	isc_mem_put(mctx, manager->fdpollinfo,
+		    sizeof(pollinfo_t) * manager->maxsocks);
+#elif defined(USE_SELECT)
+	if (manager->read_fds != NULL)
+		isc_mem_put(mctx, manager->read_fds, manager->fd_bufsize);
+	if (manager->read_fds_copy != NULL)
+		isc_mem_put(mctx, manager->read_fds_copy, manager->fd_bufsize);
+	if (manager->write_fds != NULL)
+		isc_mem_put(mctx, manager->write_fds, manager->fd_bufsize);
+	if (manager->write_fds_copy != NULL)
+		isc_mem_put(mctx, manager->write_fds_copy, manager->fd_bufsize);
+#endif	/* USE_KQUEUE */
+}
+
+isc_result_t
+isc__socketmgr_create(isc_mem_t *mctx, isc_socketmgr_t **managerp) {
+	return (isc__socketmgr_create2(mctx, managerp, 0));
+}
+
+isc_result_t
+isc__socketmgr_create2(isc_mem_t *mctx, isc_socketmgr_t **managerp,
+		       unsigned int maxsocks)
+{
+	int i;
+	isc__socketmgr_t *manager;
+#ifdef USE_WATCHER_THREAD
+	char strbuf[ISC_STRERRORSIZE];
+#endif
+	isc_result_t result;
+
+	REQUIRE(managerp != NULL && *managerp == NULL);
+
+#ifdef USE_SHARED_MANAGER
+	if (socketmgr != NULL) {
+		/* Don't allow maxsocks to be updated */
+		if (maxsocks > 0 && socketmgr->maxsocks != maxsocks)
+			return (ISC_R_EXISTS);
+
+		socketmgr->refs++;
+		*managerp = (isc_socketmgr_t *)socketmgr;
+		return (ISC_R_SUCCESS);
+	}
+#endif /* USE_SHARED_MANAGER */
+
+	if (maxsocks == 0)
+		maxsocks = ISC_SOCKET_MAXSOCKETS;
+
+	manager = isc_mem_get(mctx, sizeof(*manager));
+	if (manager == NULL)
+		return (ISC_R_NOMEMORY);
+
+	/* zero-clear so that necessary cleanup on failure will be easy */
+	memset(manager, 0, sizeof(*manager));
+	manager->maxsocks = maxsocks;
+	manager->reserved = 0;
+	manager->maxudp = 0;
+	manager->fds = isc_mem_get(mctx,
+				   manager->maxsocks * sizeof(isc__socket_t *));
+	if (manager->fds == NULL) {
+		result = ISC_R_NOMEMORY;
+		goto free_manager;
+	}
+	manager->fdstate = isc_mem_get(mctx, manager->maxsocks * sizeof(int));
+	if (manager->fdstate == NULL) {
+		result = ISC_R_NOMEMORY;
+		goto free_manager;
+	}
+#if defined(USE_EPOLL)
+	manager->epoll_events = isc_mem_get(mctx, (manager->maxsocks *
+						   sizeof(uint32_t)));
+	if (manager->epoll_events == NULL) {
+		result = ISC_R_NOMEMORY;
+		goto free_manager;
+	}
+	memset(manager->epoll_events, 0, manager->maxsocks * sizeof(uint32_t));
+#endif
+	manager->stats = NULL;
+
+	manager->common.methods = &socketmgrmethods;
+	manager->common.magic = ISCAPI_SOCKETMGR_MAGIC;
+	manager->common.impmagic = SOCKET_MANAGER_MAGIC;
+	manager->mctx = NULL;
+	memset(manager->fds, 0, manager->maxsocks * sizeof(isc_socket_t *));
+	ISC_LIST_INIT(manager->socklist);
+	result = isc_mutex_init(&manager->lock);
+	if (result != ISC_R_SUCCESS)
+		goto free_manager;
+	manager->fdlock = isc_mem_get(mctx, FDLOCK_COUNT * sizeof(isc_mutex_t));
+	if (manager->fdlock == NULL) {
+		result = ISC_R_NOMEMORY;
+		goto cleanup_lock;
+	}
+	for (i = 0; i < FDLOCK_COUNT; i++) {
+		result = isc_mutex_init(&manager->fdlock[i]);
+		if (result != ISC_R_SUCCESS) {
+			while (--i >= 0)
+				DESTROYLOCK(&manager->fdlock[i]);
+			isc_mem_put(mctx, manager->fdlock,
+				    FDLOCK_COUNT * sizeof(isc_mutex_t));
+			manager->fdlock = NULL;
+			goto cleanup_lock;
+		}
+	}
+
+#ifdef USE_WATCHER_THREAD
+	if (isc_condition_init(&manager->shutdown_ok) != ISC_R_SUCCESS) {
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 "isc_condition_init() %s",
+				 isc_msgcat_get(isc_msgcat, ISC_MSGSET_GENERAL,
+						ISC_MSG_FAILED, "failed"));
+		result = ISC_R_UNEXPECTED;
+		goto cleanup_lock;
+	}
+
+	/*
+	 * Create the special fds that will be used to wake up the
+	 * select/poll loop when something internal needs to be done.
+	 */
+	if (pipe(manager->pipe_fds) != 0) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 "pipe() %s: %s",
+				 isc_msgcat_get(isc_msgcat, ISC_MSGSET_GENERAL,
+						ISC_MSG_FAILED, "failed"),
+				 strbuf);
+		result = ISC_R_UNEXPECTED;
+		goto cleanup_condition;
+	}
+
+	RUNTIME_CHECK(make_nonblock(manager->pipe_fds[0]) == ISC_R_SUCCESS);
+#if 0
+	RUNTIME_CHECK(make_nonblock(manager->pipe_fds[1]) == ISC_R_SUCCESS);
+#endif
+#endif	/* USE_WATCHER_THREAD */
+
+#ifdef USE_SHARED_MANAGER
+	manager->refs = 1;
+#endif /* USE_SHARED_MANAGER */
+
+	/*
+	 * Set up initial state for the select loop
+	 */
+	result = setup_watcher(mctx, manager);
+	if (result != ISC_R_SUCCESS)
+		goto cleanup;
+
+	memset(manager->fdstate, 0, manager->maxsocks * sizeof(int));
+
+#ifdef USE_WATCHER_THREAD
+	/*
+	 * Start up the select/poll thread.
+	 */
+	if (isc_thread_create(watcher, manager, &manager->watcher) !=
+	    ISC_R_SUCCESS) {
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 "isc_thread_create() %s",
+				 isc_msgcat_get(isc_msgcat, ISC_MSGSET_GENERAL,
+						ISC_MSG_FAILED, "failed"));
+		cleanup_watcher(mctx, manager);
+		result = ISC_R_UNEXPECTED;
+		goto cleanup;
+	}
+	isc_thread_setname(manager->watcher, "isc-socket");
+#endif /* USE_WATCHER_THREAD */
+	isc_mem_attach(mctx, &manager->mctx);
+
+#ifdef USE_SHARED_MANAGER
+	socketmgr = manager;
+#endif /* USE_SHARED_MANAGER */
+	*managerp = (isc_socketmgr_t *)manager;
+
+	return (ISC_R_SUCCESS);
+
+cleanup:
+#ifdef USE_WATCHER_THREAD
+	(void)close(manager->pipe_fds[0]);
+	(void)close(manager->pipe_fds[1]);
+#endif	/* USE_WATCHER_THREAD */
+
+#ifdef USE_WATCHER_THREAD
+cleanup_condition:
+	(void)isc_condition_destroy(&manager->shutdown_ok);
+#endif	/* USE_WATCHER_THREAD */
+
+
+cleanup_lock:
+	if (manager->fdlock != NULL) {
+		for (i = 0; i < FDLOCK_COUNT; i++)
+			DESTROYLOCK(&manager->fdlock[i]);
+	}
+	DESTROYLOCK(&manager->lock);
+
+free_manager:
+	if (manager->fdlock != NULL) {
+		isc_mem_put(mctx, manager->fdlock,
+			    FDLOCK_COUNT * sizeof(isc_mutex_t));
+	}
+#if defined(USE_EPOLL)
+	if (manager->epoll_events != NULL) {
+		isc_mem_put(mctx, manager->epoll_events,
+			    manager->maxsocks * sizeof(uint32_t));
+	}
+#endif
+	if (manager->fdstate != NULL) {
+		isc_mem_put(mctx, manager->fdstate,
+			    manager->maxsocks * sizeof(int));
+	}
+	if (manager->fds != NULL) {
+		isc_mem_put(mctx, manager->fds,
+			    manager->maxsocks * sizeof(isc_socket_t *));
+	}
+	isc_mem_put(mctx, manager, sizeof(*manager));
+
+	return (result);
+}
+
+isc_result_t
+isc_socketmgr_getmaxsockets(isc_socketmgr_t *manager0, unsigned int *nsockp) {
+	isc__socketmgr_t *manager = (isc__socketmgr_t *)manager0;
+	REQUIRE(VALID_MANAGER(manager));
+	REQUIRE(nsockp != NULL);
+
+	*nsockp = manager->maxsocks;
+
+	return (ISC_R_SUCCESS);
+}
+
+void
+isc_socketmgr_setstats(isc_socketmgr_t *manager0, isc_stats_t *stats) {
+	isc__socketmgr_t *manager = (isc__socketmgr_t *)manager0;
+
+	REQUIRE(VALID_MANAGER(manager));
+	REQUIRE(ISC_LIST_EMPTY(manager->socklist));
+	REQUIRE(manager->stats == NULL);
+	REQUIRE(isc_stats_ncounters(stats) == isc_sockstatscounter_max);
+
+	isc_stats_attach(stats, &manager->stats);
+}
+
+void
+isc__socketmgr_destroy(isc_socketmgr_t **managerp) {
+	isc__socketmgr_t *manager;
+	int i;
+	isc_mem_t *mctx;
+
+	/*
+	 * Destroy a socket manager.
+	 */
+
+	REQUIRE(managerp != NULL);
+	manager = (isc__socketmgr_t *)*managerp;
+	REQUIRE(VALID_MANAGER(manager));
+
+#ifdef USE_SHARED_MANAGER
+	manager->refs--;
+	if (manager->refs > 0) {
+		*managerp = NULL;
+		return;
+	}
+	socketmgr = NULL;
+#endif /* USE_SHARED_MANAGER */
+
+	LOCK(&manager->lock);
+
+	/*
+	 * Wait for all sockets to be destroyed.
+	 */
+	while (!ISC_LIST_EMPTY(manager->socklist)) {
+#ifdef USE_WATCHER_THREAD
+		manager_log(manager, CREATION, "%s",
+			    isc_msgcat_get(isc_msgcat, ISC_MSGSET_SOCKET,
+					   ISC_MSG_SOCKETSREMAIN,
+					   "sockets exist"));
+		WAIT(&manager->shutdown_ok, &manager->lock);
+#else /* USE_WATCHER_THREAD */
+		UNLOCK(&manager->lock);
+		isc__taskmgr_dispatch(NULL);
+		LOCK(&manager->lock);
+#endif /* USE_WATCHER_THREAD */
+	}
+
+	UNLOCK(&manager->lock);
+
+	/*
+	 * Here, poke our select/poll thread.  Do this by closing the write
+	 * half of the pipe, which will send EOF to the read half.
+	 * This is currently a no-op in the non-threaded case.
+	 */
+	select_poke(manager, 0, SELECT_POKE_SHUTDOWN);
+
+#ifdef USE_WATCHER_THREAD
+	/*
+	 * Wait for thread to exit.
+	 */
+	if (isc_thread_join(manager->watcher, NULL) != ISC_R_SUCCESS)
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 "isc_thread_join() %s",
+				 isc_msgcat_get(isc_msgcat, ISC_MSGSET_GENERAL,
+						ISC_MSG_FAILED, "failed"));
+#endif /* USE_WATCHER_THREAD */
+
+	/*
+	 * Clean up.
+	 */
+	cleanup_watcher(manager->mctx, manager);
+
+#ifdef USE_WATCHER_THREAD
+	(void)close(manager->pipe_fds[0]);
+	(void)close(manager->pipe_fds[1]);
+	(void)isc_condition_destroy(&manager->shutdown_ok);
+#endif /* USE_WATCHER_THREAD */
+
+	for (i = 0; i < (int)manager->maxsocks; i++)
+		if (manager->fdstate[i] == CLOSE_PENDING) /* no need to lock */
+			(void)close(i);
+
+#if defined(USE_EPOLL)
+	isc_mem_put(manager->mctx, manager->epoll_events,
+		    manager->maxsocks * sizeof(uint32_t));
+#endif
+	isc_mem_put(manager->mctx, manager->fds,
+		    manager->maxsocks * sizeof(isc__socket_t *));
+	isc_mem_put(manager->mctx, manager->fdstate,
+		    manager->maxsocks * sizeof(int));
+
+	if (manager->stats != NULL)
+		isc_stats_detach(&manager->stats);
+
+	if (manager->fdlock != NULL) {
+		for (i = 0; i < FDLOCK_COUNT; i++)
+			DESTROYLOCK(&manager->fdlock[i]);
+		isc_mem_put(manager->mctx, manager->fdlock,
+			    FDLOCK_COUNT * sizeof(isc_mutex_t));
+	}
+	DESTROYLOCK(&manager->lock);
+	manager->common.magic = 0;
+	manager->common.impmagic = 0;
+	mctx= manager->mctx;
+	isc_mem_put(mctx, manager, sizeof(*manager));
+
+	isc_mem_detach(&mctx);
+
+	*managerp = NULL;
+
+#ifdef USE_SHARED_MANAGER
+	socketmgr = NULL;
+#endif
+}
+
+static isc_result_t
+socket_recv(isc__socket_t *sock, isc_socketevent_t *dev, isc_task_t *task,
+	    unsigned int flags)
+{
+	int io_state;
+	bool have_lock = false;
+	isc_task_t *ntask = NULL;
+	isc_result_t result = ISC_R_SUCCESS;
+
+	dev->ev_sender = task;
+
+	if (sock->type == isc_sockettype_udp) {
+		io_state = doio_recv(sock, dev);
+	} else {
+		LOCK(&sock->lock);
+		have_lock = true;
+
+		if (ISC_LIST_EMPTY(sock->recv_list))
+			io_state = doio_recv(sock, dev);
+		else
+			io_state = DOIO_SOFT;
+	}
+
+	switch (io_state) {
+	case DOIO_SOFT:
+		/*
+		 * We couldn't read all or part of the request right now, so
+		 * queue it.
+		 *
+		 * Attach to socket and to task
+		 */
+		isc_task_attach(task, &ntask);
+		dev->attributes |= ISC_SOCKEVENTATTR_ATTACHED;
+
+		if (!have_lock) {
+			LOCK(&sock->lock);
+			have_lock = true;
+		}
+
+		/*
+		 * Enqueue the request.  If the socket was previously not being
+		 * watched, poke the watcher to start paying attention to it.
+		 */
+		if (ISC_LIST_EMPTY(sock->recv_list) && !sock->pending_recv)
+			select_poke(sock->manager, sock->fd, SELECT_POKE_READ);
+		ISC_LIST_ENQUEUE(sock->recv_list, dev, ev_link);
+
+		socket_log(sock, NULL, EVENT, NULL, 0, 0,
+			   "socket_recv: event %p -> task %p",
+			   dev, ntask);
+
+		if ((flags & ISC_SOCKFLAG_IMMEDIATE) != 0)
+			result = ISC_R_INPROGRESS;
+		break;
+
+	case DOIO_EOF:
+		dev->result = ISC_R_EOF;
+		/* fallthrough */
+
+	case DOIO_HARD:
+	case DOIO_SUCCESS:
+		if ((flags & ISC_SOCKFLAG_IMMEDIATE) == 0)
+			send_recvdone_event(sock, &dev);
+		break;
+	}
+
+	if (have_lock)
+		UNLOCK(&sock->lock);
+
+	return (result);
+}
+
+isc_result_t
+isc__socket_recvv(isc_socket_t *sock0, isc_bufferlist_t *buflist,
+		  unsigned int minimum, isc_task_t *task,
+		  isc_taskaction_t action, void *arg)
+{
+	isc__socket_t *sock = (isc__socket_t *)sock0;
+	isc_socketevent_t *dev;
+	isc__socketmgr_t *manager;
+	unsigned int iocount;
+	isc_buffer_t *buffer;
+
+	REQUIRE(VALID_SOCKET(sock));
+	REQUIRE(buflist != NULL);
+	REQUIRE(!ISC_LIST_EMPTY(*buflist));
+	REQUIRE(task != NULL);
+	REQUIRE(action != NULL);
+
+	manager = sock->manager;
+	REQUIRE(VALID_MANAGER(manager));
+
+	iocount = isc_bufferlist_availablecount(buflist);
+	REQUIRE(iocount > 0);
+
+	INSIST(sock->bound);
+
+	dev = allocate_socketevent(manager->mctx, sock,
+				   ISC_SOCKEVENT_RECVDONE, action, arg);
+	if (dev == NULL)
+		return (ISC_R_NOMEMORY);
+
+	/*
+	 * UDP sockets are always partial read
+	 */
+	if (sock->type == isc_sockettype_udp)
+		dev->minimum = 1;
+	else {
+		if (minimum == 0)
+			dev->minimum = iocount;
+		else
+			dev->minimum = minimum;
+	}
+
+	/*
+	 * Move each buffer from the passed in list to our internal one.
+	 */
+	buffer = ISC_LIST_HEAD(*buflist);
+	while (buffer != NULL) {
+		ISC_LIST_DEQUEUE(*buflist, buffer, link);
+		ISC_LIST_ENQUEUE(dev->bufferlist, buffer, link);
+		buffer = ISC_LIST_HEAD(*buflist);
+	}
+
+	return (socket_recv(sock, dev, task, 0));
+}
+
+isc_result_t
+isc__socket_recv(isc_socket_t *sock0, isc_region_t *region,
+		 unsigned int minimum, isc_task_t *task,
+		 isc_taskaction_t action, void *arg)
+{
+	isc__socket_t *sock = (isc__socket_t *)sock0;
+	isc_socketevent_t *dev;
+	isc__socketmgr_t *manager;
+
+	REQUIRE(VALID_SOCKET(sock));
+	REQUIRE(action != NULL);
+
+	manager = sock->manager;
+	REQUIRE(VALID_MANAGER(manager));
+
+	INSIST(sock->bound);
+
+	dev = allocate_socketevent(manager->mctx, sock,
+				   ISC_SOCKEVENT_RECVDONE, action, arg);
+	if (dev == NULL)
+		return (ISC_R_NOMEMORY);
+
+	return (isc__socket_recv2(sock0, region, minimum, task, dev, 0));
+}
+
+isc_result_t
+isc__socket_recv2(isc_socket_t *sock0, isc_region_t *region,
+		  unsigned int minimum, isc_task_t *task,
+		  isc_socketevent_t *event, unsigned int flags)
+{
+	isc__socket_t *sock = (isc__socket_t *)sock0;
+
+	event->ev_sender = sock;
+	event->result = ISC_R_UNSET;
+	ISC_LIST_INIT(event->bufferlist);
+	event->region = *region;
+	event->n = 0;
+	event->offset = 0;
+	event->attributes = 0;
+
+	/*
+	 * UDP sockets are always partial read.
+	 */
+	if (sock->type == isc_sockettype_udp)
+		event->minimum = 1;
+	else {
+		if (minimum == 0)
+			event->minimum = region->length;
+		else
+			event->minimum = minimum;
+	}
+
+	return (socket_recv(sock, event, task, flags));
+}
+
+static isc_result_t
+socket_send(isc__socket_t *sock, isc_socketevent_t *dev, isc_task_t *task,
+	    isc_sockaddr_t *address, struct in6_pktinfo *pktinfo,
+	    unsigned int flags)
+{
+	int io_state;
+	bool have_lock = false;
+	isc_task_t *ntask = NULL;
+	isc_result_t result = ISC_R_SUCCESS;
+
+	dev->ev_sender = task;
+
+	set_dev_address(address, sock, dev);
+	if (pktinfo != NULL) {
+		dev->attributes |= ISC_SOCKEVENTATTR_PKTINFO;
+		dev->pktinfo = *pktinfo;
+
+		if (!isc_sockaddr_issitelocal(&dev->address) &&
+		    !isc_sockaddr_islinklocal(&dev->address)) {
+			socket_log(sock, NULL, TRACE, isc_msgcat,
+				   ISC_MSGSET_SOCKET, ISC_MSG_PKTINFOPROVIDED,
+				   "pktinfo structure provided, ifindex %u "
+				   "(set to 0)", pktinfo->ipi6_ifindex);
+
+			/*
+			 * Set the pktinfo index to 0 here, to let the
+			 * kernel decide what interface it should send on.
+			 */
+			dev->pktinfo.ipi6_ifindex = 0;
+		}
+	}
+
+	if (sock->type == isc_sockettype_udp)
+		io_state = doio_send(sock, dev);
+	else {
+		LOCK(&sock->lock);
+		have_lock = true;
+
+		if (ISC_LIST_EMPTY(sock->send_list))
+			io_state = doio_send(sock, dev);
+		else
+			io_state = DOIO_SOFT;
+	}
+
+	switch (io_state) {
+	case DOIO_SOFT:
+		/*
+		 * We couldn't send all or part of the request right now, so
+		 * queue it unless ISC_SOCKFLAG_NORETRY is set.
+		 */
+		if ((flags & ISC_SOCKFLAG_NORETRY) == 0) {
+			isc_task_attach(task, &ntask);
+			dev->attributes |= ISC_SOCKEVENTATTR_ATTACHED;
+
+			if (!have_lock) {
+				LOCK(&sock->lock);
+				have_lock = true;
+			}
+
+			/*
+			 * Enqueue the request.  If the socket was previously
+			 * not being watched, poke the watcher to start
+			 * paying attention to it.
+			 */
+			if (ISC_LIST_EMPTY(sock->send_list) &&
+			    !sock->pending_send)
+				select_poke(sock->manager, sock->fd,
+					    SELECT_POKE_WRITE);
+			ISC_LIST_ENQUEUE(sock->send_list, dev, ev_link);
+
+			socket_log(sock, NULL, EVENT, NULL, 0, 0,
+				   "socket_send: event %p -> task %p",
+				   dev, ntask);
+
+			if ((flags & ISC_SOCKFLAG_IMMEDIATE) != 0)
+				result = ISC_R_INPROGRESS;
+			break;
+		}
+
+		/* FALLTHROUGH */
+
+	case DOIO_HARD:
+	case DOIO_SUCCESS:
+		if ((flags & ISC_SOCKFLAG_IMMEDIATE) == 0)
+			send_senddone_event(sock, &dev);
+		break;
+	}
+
+	if (have_lock)
+		UNLOCK(&sock->lock);
+
+	return (result);
+}
+
+isc_result_t
+isc__socket_send(isc_socket_t *sock, isc_region_t *region,
+		 isc_task_t *task, isc_taskaction_t action, void *arg)
+{
+	/*
+	 * REQUIRE() checking is performed in isc_socket_sendto().
+	 */
+	return (isc__socket_sendto(sock, region, task, action, arg, NULL,
+				   NULL));
+}
+
+isc_result_t
+isc__socket_sendto(isc_socket_t *sock0, isc_region_t *region,
+		   isc_task_t *task, isc_taskaction_t action, void *arg,
+		   isc_sockaddr_t *address, struct in6_pktinfo *pktinfo)
+{
+	isc__socket_t *sock = (isc__socket_t *)sock0;
+	isc_socketevent_t *dev;
+	isc__socketmgr_t *manager;
+
+	REQUIRE(VALID_SOCKET(sock));
+	REQUIRE(region != NULL);
+	REQUIRE(task != NULL);
+	REQUIRE(action != NULL);
+
+	manager = sock->manager;
+	REQUIRE(VALID_MANAGER(manager));
+
+	INSIST(sock->bound);
+
+	dev = allocate_socketevent(manager->mctx, sock,
+				   ISC_SOCKEVENT_SENDDONE, action, arg);
+	if (dev == NULL)
+		return (ISC_R_NOMEMORY);
+
+	dev->region = *region;
+
+	return (socket_send(sock, dev, task, address, pktinfo, 0));
+}
+
+isc_result_t
+isc__socket_sendv(isc_socket_t *sock, isc_bufferlist_t *buflist,
+		  isc_task_t *task, isc_taskaction_t action, void *arg)
+{
+	return (isc__socket_sendtov2(sock, buflist, task, action, arg, NULL,
+				     NULL, 0));
+}
+
+isc_result_t
+isc__socket_sendtov(isc_socket_t *sock, isc_bufferlist_t *buflist,
+		    isc_task_t *task, isc_taskaction_t action, void *arg,
+		    isc_sockaddr_t *address, struct in6_pktinfo *pktinfo)
+{
+	return (isc__socket_sendtov2(sock, buflist, task, action, arg, address,
+				     pktinfo, 0));
+}
+
+isc_result_t
+isc__socket_sendtov2(isc_socket_t *sock0, isc_bufferlist_t *buflist,
+		     isc_task_t *task, isc_taskaction_t action, void *arg,
+		     isc_sockaddr_t *address, struct in6_pktinfo *pktinfo,
+		     unsigned int flags)
+{
+	isc__socket_t *sock = (isc__socket_t *)sock0;
+	isc_socketevent_t *dev;
+	isc__socketmgr_t *manager;
+	unsigned int iocount;
+	isc_buffer_t *buffer;
+
+	REQUIRE(VALID_SOCKET(sock));
+	REQUIRE(buflist != NULL);
+	REQUIRE(!ISC_LIST_EMPTY(*buflist));
+	REQUIRE(task != NULL);
+	REQUIRE(action != NULL);
+
+	manager = sock->manager;
+	REQUIRE(VALID_MANAGER(manager));
+
+	iocount = isc_bufferlist_usedcount(buflist);
+	REQUIRE(iocount > 0);
+
+	dev = allocate_socketevent(manager->mctx, sock,
+				   ISC_SOCKEVENT_SENDDONE, action, arg);
+	if (dev == NULL)
+		return (ISC_R_NOMEMORY);
+
+	/*
+	 * Move each buffer from the passed in list to our internal one.
+	 */
+	buffer = ISC_LIST_HEAD(*buflist);
+	while (buffer != NULL) {
+		ISC_LIST_DEQUEUE(*buflist, buffer, link);
+		ISC_LIST_ENQUEUE(dev->bufferlist, buffer, link);
+		buffer = ISC_LIST_HEAD(*buflist);
+	}
+
+	return (socket_send(sock, dev, task, address, pktinfo, flags));
+}
+
+isc_result_t
+isc__socket_sendto2(isc_socket_t *sock0, isc_region_t *region,
+		    isc_task_t *task,
+		    isc_sockaddr_t *address, struct in6_pktinfo *pktinfo,
+		    isc_socketevent_t *event, unsigned int flags)
+{
+	isc__socket_t *sock = (isc__socket_t *)sock0;
+
+	REQUIRE(VALID_SOCKET(sock));
+	REQUIRE((flags & ~(ISC_SOCKFLAG_IMMEDIATE|ISC_SOCKFLAG_NORETRY)) == 0);
+	if ((flags & ISC_SOCKFLAG_NORETRY) != 0)
+		REQUIRE(sock->type == isc_sockettype_udp);
+	event->ev_sender = sock;
+	event->result = ISC_R_UNSET;
+	ISC_LIST_INIT(event->bufferlist);
+	event->region = *region;
+	event->n = 0;
+	event->offset = 0;
+	event->attributes &= ~ISC_SOCKEVENTATTR_ATTACHED;
+
+	return (socket_send(sock, event, task, address, pktinfo, flags));
+}
+
+void
+isc__socket_cleanunix(isc_sockaddr_t *sockaddr, bool active) {
+#ifdef ISC_PLATFORM_HAVESYSUNH
+	int s;
+	struct stat sb;
+	char strbuf[ISC_STRERRORSIZE];
+
+	if (sockaddr->type.sa.sa_family != AF_UNIX)
+		return;
+
+#ifndef S_ISSOCK
+#if defined(S_IFMT) && defined(S_IFSOCK)
+#define S_ISSOCK(mode) ((mode & S_IFMT)==S_IFSOCK)
+#elif defined(_S_IFMT) && defined(S_IFSOCK)
+#define S_ISSOCK(mode) ((mode & _S_IFMT)==S_IFSOCK)
+#endif
+#endif
+
+#ifndef S_ISFIFO
+#if defined(S_IFMT) && defined(S_IFIFO)
+#define S_ISFIFO(mode) ((mode & S_IFMT)==S_IFIFO)
+#elif defined(_S_IFMT) && defined(S_IFIFO)
+#define S_ISFIFO(mode) ((mode & _S_IFMT)==S_IFIFO)
+#endif
+#endif
+
+#if !defined(S_ISFIFO) && !defined(S_ISSOCK)
+#error You need to define S_ISFIFO and S_ISSOCK as appropriate for your platform.  See <sys/stat.h>.
+#endif
+
+#ifndef S_ISFIFO
+#define S_ISFIFO(mode) 0
+#endif
+
+#ifndef S_ISSOCK
+#define S_ISSOCK(mode) 0
+#endif
+
+	if (active) {
+		if (stat(sockaddr->type.sunix.sun_path, &sb) < 0) {
+			isc__strerror(errno, strbuf, sizeof(strbuf));
+			isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+				      ISC_LOGMODULE_SOCKET, ISC_LOG_ERROR,
+				      "isc_socket_cleanunix: stat(%s): %s",
+				      sockaddr->type.sunix.sun_path, strbuf);
+			return;
+		}
+		if (!(S_ISSOCK(sb.st_mode) || S_ISFIFO(sb.st_mode))) {
+			isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+				      ISC_LOGMODULE_SOCKET, ISC_LOG_ERROR,
+				      "isc_socket_cleanunix: %s: not a socket",
+				      sockaddr->type.sunix.sun_path);
+			return;
+		}
+		if (unlink(sockaddr->type.sunix.sun_path) < 0) {
+			isc__strerror(errno, strbuf, sizeof(strbuf));
+			isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+				      ISC_LOGMODULE_SOCKET, ISC_LOG_ERROR,
+				      "isc_socket_cleanunix: unlink(%s): %s",
+				      sockaddr->type.sunix.sun_path, strbuf);
+		}
+		return;
+	}
+
+	s = socket(AF_UNIX, SOCK_STREAM, 0);
+	if (s < 0) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+			      ISC_LOGMODULE_SOCKET, ISC_LOG_WARNING,
+			      "isc_socket_cleanunix: socket(%s): %s",
+			      sockaddr->type.sunix.sun_path, strbuf);
+		return;
+	}
+
+	if (stat(sockaddr->type.sunix.sun_path, &sb) < 0) {
+		switch (errno) {
+		case ENOENT:    /* We exited cleanly last time */
+			break;
+		default:
+			isc__strerror(errno, strbuf, sizeof(strbuf));
+			isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+				      ISC_LOGMODULE_SOCKET, ISC_LOG_WARNING,
+				      "isc_socket_cleanunix: stat(%s): %s",
+				      sockaddr->type.sunix.sun_path, strbuf);
+			break;
+		}
+		goto cleanup;
+	}
+
+	if (!(S_ISSOCK(sb.st_mode) || S_ISFIFO(sb.st_mode))) {
+		isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+			      ISC_LOGMODULE_SOCKET, ISC_LOG_WARNING,
+			      "isc_socket_cleanunix: %s: not a socket",
+			      sockaddr->type.sunix.sun_path);
+		goto cleanup;
+	}
+
+	if (connect(s, (struct sockaddr *)&sockaddr->type.sunix,
+		    sizeof(sockaddr->type.sunix)) < 0) {
+		switch (errno) {
+		case ECONNREFUSED:
+		case ECONNRESET:
+			if (unlink(sockaddr->type.sunix.sun_path) < 0) {
+				isc__strerror(errno, strbuf, sizeof(strbuf));
+				isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+					      ISC_LOGMODULE_SOCKET,
+					      ISC_LOG_WARNING,
+					      "isc_socket_cleanunix: "
+					      "unlink(%s): %s",
+					      sockaddr->type.sunix.sun_path,
+					      strbuf);
+			}
+			break;
+		default:
+			isc__strerror(errno, strbuf, sizeof(strbuf));
+			isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+				      ISC_LOGMODULE_SOCKET, ISC_LOG_WARNING,
+				      "isc_socket_cleanunix: connect(%s): %s",
+				      sockaddr->type.sunix.sun_path, strbuf);
+			break;
+		}
+	}
+ cleanup:
+	close(s);
+#else
+	UNUSED(sockaddr);
+	UNUSED(active);
+#endif
+}
+
+isc_result_t
+isc__socket_permunix(isc_sockaddr_t *sockaddr, uint32_t perm,
+		    uint32_t owner, uint32_t group)
+{
+#ifdef ISC_PLATFORM_HAVESYSUNH
+	isc_result_t result = ISC_R_SUCCESS;
+	char strbuf[ISC_STRERRORSIZE];
+	char path[sizeof(sockaddr->type.sunix.sun_path)];
+#ifdef NEED_SECURE_DIRECTORY
+	char *slash;
+#endif
+
+	REQUIRE(sockaddr->type.sa.sa_family == AF_UNIX);
+	INSIST(strlen(sockaddr->type.sunix.sun_path) < sizeof(path));
+	strlcpy(path, sockaddr->type.sunix.sun_path, sizeof(path));
+
+#ifdef NEED_SECURE_DIRECTORY
+	slash = strrchr(path, '/');
+	if (slash != NULL) {
+		if (slash != path) {
+			*slash = '\0';
+		} else {
+			strlcpy(path, "/", sizeof(path));
+		}
+	} else {
+		strlcpy(path, ".", sizeof(path));
+	}
+#endif
+
+	if (chmod(path, perm) < 0) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+			      ISC_LOGMODULE_SOCKET, ISC_LOG_ERROR,
+			      "isc_socket_permunix: chmod(%s, %d): %s",
+			      path, perm, strbuf);
+		result = ISC_R_FAILURE;
+	}
+	if (chown(path, owner, group) < 0) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+			      ISC_LOGMODULE_SOCKET, ISC_LOG_ERROR,
+			      "isc_socket_permunix: chown(%s, %d, %d): %s",
+			      path, owner, group,
+			      strbuf);
+		result = ISC_R_FAILURE;
+	}
+	return (result);
+#else
+	UNUSED(sockaddr);
+	UNUSED(perm);
+	UNUSED(owner);
+	UNUSED(group);
+	return (ISC_R_NOTIMPLEMENTED);
+#endif
+}
+
+isc_result_t
+isc__socket_bind(isc_socket_t *sock0, isc_sockaddr_t *sockaddr,
+		 unsigned int options) {
+	isc__socket_t *sock = (isc__socket_t *)sock0;
+	char strbuf[ISC_STRERRORSIZE];
+	int on = 1;
+
+	REQUIRE(VALID_SOCKET(sock));
+
+	LOCK(&sock->lock);
+
+	INSIST(!sock->bound);
+	INSIST(!sock->dupped);
+
+	if (sock->pf != sockaddr->type.sa.sa_family) {
+		UNLOCK(&sock->lock);
+		return (ISC_R_FAMILYMISMATCH);
+	}
+
+	/*
+	 * Only set SO_REUSEADDR when we want a specific port.
+	 */
+#ifdef AF_UNIX
+	if (sock->pf == AF_UNIX)
+		goto bind_socket;
+#endif
+	if ((options & ISC_SOCKET_REUSEADDRESS) != 0 &&
+	    isc_sockaddr_getport(sockaddr) != (in_port_t)0 &&
+	    setsockopt(sock->fd, SOL_SOCKET, SO_REUSEADDR, (void *)&on,
+		       sizeof(on)) < 0) {
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 "setsockopt(%d) %s", sock->fd,
+				 isc_msgcat_get(isc_msgcat, ISC_MSGSET_GENERAL,
+						ISC_MSG_FAILED, "failed"));
+		/* Press on... */
+	}
+#ifdef AF_UNIX
+ bind_socket:
+#endif
+	if (bind(sock->fd, &sockaddr->type.sa, sockaddr->length) < 0) {
+		inc_stats(sock->manager->stats,
+			  sock->statsindex[STATID_BINDFAIL]);
+
+		UNLOCK(&sock->lock);
+		switch (errno) {
+		case EACCES:
+			return (ISC_R_NOPERM);
+		case EADDRNOTAVAIL:
+			return (ISC_R_ADDRNOTAVAIL);
+		case EADDRINUSE:
+			return (ISC_R_ADDRINUSE);
+		case EINVAL:
+			return (ISC_R_BOUND);
+		default:
+			isc__strerror(errno, strbuf, sizeof(strbuf));
+			UNEXPECTED_ERROR(__FILE__, __LINE__, "bind: %s",
+					 strbuf);
+			return (ISC_R_UNEXPECTED);
+		}
+	}
+
+	socket_log(sock, sockaddr, TRACE,
+		   isc_msgcat, ISC_MSGSET_SOCKET, ISC_MSG_BOUND, "bound");
+	sock->bound = 1;
+
+	UNLOCK(&sock->lock);
+	return (ISC_R_SUCCESS);
+}
+
+/*
+ * Enable this only for specific OS versions, and only when they have repaired
+ * their problems with it.  Until then, this is is broken and needs to be
+ * diabled by default.  See RT22589 for details.
+ */
+#undef ENABLE_ACCEPTFILTER
+
+isc_result_t
+isc__socket_filter(isc_socket_t *sock0, const char *filter) {
+	isc__socket_t *sock = (isc__socket_t *)sock0;
+#if defined(SO_ACCEPTFILTER) && defined(ENABLE_ACCEPTFILTER)
+	char strbuf[ISC_STRERRORSIZE];
+	struct accept_filter_arg afa;
+#else
+	UNUSED(sock);
+	UNUSED(filter);
+#endif
+
+	REQUIRE(VALID_SOCKET(sock));
+
+#if defined(SO_ACCEPTFILTER) && defined(ENABLE_ACCEPTFILTER)
+	bzero(&afa, sizeof(afa));
+	strlcpy(afa.af_name, filter, sizeof(afa.af_name));
+	if (setsockopt(sock->fd, SOL_SOCKET, SO_ACCEPTFILTER,
+			 &afa, sizeof(afa)) == -1) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		socket_log(sock, NULL, CREATION, isc_msgcat, ISC_MSGSET_SOCKET,
+			   ISC_MSG_FILTER, "setsockopt(SO_ACCEPTFILTER): %s",
+			   strbuf);
+		return (ISC_R_FAILURE);
+	}
+	return (ISC_R_SUCCESS);
+#else
+	return (ISC_R_NOTIMPLEMENTED);
+#endif
+}
+
+/*
+ * Try enabling TCP Fast Open for a given socket if the OS supports it.
+ */
+static void
+set_tcp_fastopen(isc__socket_t *sock, unsigned int backlog) {
+#if defined(ISC_PLATFORM_HAVETFO) && defined(TCP_FASTOPEN)
+	char strbuf[ISC_STRERRORSIZE];
+
+/*
+ * FreeBSD, as of versions 10.3 and 11.0, defines TCP_FASTOPEN while also
+ * shipping a default kernel without TFO support, so we special-case it by
+ * performing an additional runtime check for TFO support using sysctl to
+ * prevent setsockopt() errors from being logged.
+ */
+#if defined(__FreeBSD__) && defined(HAVE_SYSCTLBYNAME)
+#define SYSCTL_TFO "net.inet.tcp.fastopen.enabled"
+	unsigned int enabled;
+	size_t enabledlen = sizeof(enabled);
+	static bool tfo_notice_logged = false;
+
+	if (sysctlbyname(SYSCTL_TFO, &enabled, &enabledlen, NULL, 0) < 0) {
+		/*
+		 * This kernel does not support TCP Fast Open.  There is
+		 * nothing more we can do.
+		 */
+		return;
+	} else if (enabled == 0) {
+		/*
+		 * This kernel does support TCP Fast Open, but it is disabled
+		 * by sysctl.  Notify the user, but do not nag.
+		 */
+		if (!tfo_notice_logged) {
+			isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+				      ISC_LOGMODULE_SOCKET, ISC_LOG_NOTICE,
+				      "TCP_FASTOPEN support is disabled by "
+				      "sysctl (" SYSCTL_TFO " = 0)");
+			tfo_notice_logged = true;
+		}
+		return;
+	}
+#endif
+
+#ifdef __APPLE__
+	backlog = 1;
+#else
+	backlog = backlog / 2;
+	if (backlog == 0)
+		backlog = 1;
+#endif
+	if (setsockopt(sock->fd, IPPROTO_TCP, TCP_FASTOPEN,
+		       (void *)&backlog, sizeof(backlog)) < 0) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 "setsockopt(%d, TCP_FASTOPEN) failed with %s",
+				 sock->fd, strbuf);
+		/* TCP_FASTOPEN is experimental so ignore failures */
+	}
+#else
+	UNUSED(sock);
+	UNUSED(backlog);
+#endif
+}
+
+/*
+ * Set up to listen on a given socket.  We do this by creating an internal
+ * event that will be dispatched when the socket has read activity.  The
+ * watcher will send the internal event to the task when there is a new
+ * connection.
+ *
+ * Unlike in read, we don't preallocate a done event here.  Every time there
+ * is a new connection we'll have to allocate a new one anyway, so we might
+ * as well keep things simple rather than having to track them.
+ */
+isc_result_t
+isc__socket_listen(isc_socket_t *sock0, unsigned int backlog) {
+	isc__socket_t *sock = (isc__socket_t *)sock0;
+	char strbuf[ISC_STRERRORSIZE];
+
+	REQUIRE(VALID_SOCKET(sock));
+
+	LOCK(&sock->lock);
+
+	REQUIRE(!sock->listener);
+	REQUIRE(sock->bound);
+	REQUIRE(sock->type == isc_sockettype_tcp ||
+		sock->type == isc_sockettype_unix);
+
+	if (backlog == 0)
+		backlog = SOMAXCONN;
+
+	if (listen(sock->fd, (int)backlog) < 0) {
+		UNLOCK(&sock->lock);
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+
+		UNEXPECTED_ERROR(__FILE__, __LINE__, "listen: %s", strbuf);
+
+		return (ISC_R_UNEXPECTED);
+	}
+
+	set_tcp_fastopen(sock, backlog);
+
+	sock->listener = 1;
+
+	UNLOCK(&sock->lock);
+	return (ISC_R_SUCCESS);
+}
+
+/*
+ * This should try to do aggressive accept() XXXMLG
+ */
+isc_result_t
+isc__socket_accept(isc_socket_t *sock0,
+		  isc_task_t *task, isc_taskaction_t action, void *arg)
+{
+	isc__socket_t *sock = (isc__socket_t *)sock0;
+	isc_socket_newconnev_t *dev;
+	isc__socketmgr_t *manager;
+	isc_task_t *ntask = NULL;
+	isc__socket_t *nsock;
+	isc_result_t result;
+	bool do_poke = false;
+
+	REQUIRE(VALID_SOCKET(sock));
+	manager = sock->manager;
+	REQUIRE(VALID_MANAGER(manager));
+
+	LOCK(&sock->lock);
+
+	REQUIRE(sock->listener);
+
+	/*
+	 * Sender field is overloaded here with the task we will be sending
+	 * this event to.  Just before the actual event is delivered the
+	 * actual ev_sender will be touched up to be the socket.
+	 */
+	dev = (isc_socket_newconnev_t *)
+		isc_event_allocate(manager->mctx, task, ISC_SOCKEVENT_NEWCONN,
+				   action, arg, sizeof(*dev));
+	if (dev == NULL) {
+		UNLOCK(&sock->lock);
+		return (ISC_R_NOMEMORY);
+	}
+	ISC_LINK_INIT(dev, ev_link);
+
+	result = allocate_socket(manager, sock->type, &nsock);
+	if (result != ISC_R_SUCCESS) {
+		isc_event_free(ISC_EVENT_PTR(&dev));
+		UNLOCK(&sock->lock);
+		return (result);
+	}
+
+	/*
+	 * Attach to socket and to task.
+	 */
+	isc_task_attach(task, &ntask);
+	if (isc_task_exiting(ntask)) {
+		free_socket(&nsock);
+		isc_task_detach(&ntask);
+		isc_event_free(ISC_EVENT_PTR(&dev));
+		UNLOCK(&sock->lock);
+		return (ISC_R_SHUTTINGDOWN);
+	}
+	nsock->references++;
+	nsock->statsindex = sock->statsindex;
+
+	dev->ev_sender = ntask;
+	dev->newsocket = (isc_socket_t *)nsock;
+
+	/*
+	 * Poke watcher here.  We still have the socket locked, so there
+	 * is no race condition.  We will keep the lock for such a short
+	 * bit of time waking it up now or later won't matter all that much.
+	 */
+	if (ISC_LIST_EMPTY(sock->accept_list))
+		do_poke = true;
+
+	ISC_LIST_ENQUEUE(sock->accept_list, dev, ev_link);
+
+	if (do_poke)
+		select_poke(manager, sock->fd, SELECT_POKE_ACCEPT);
+
+	UNLOCK(&sock->lock);
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc__socket_connect(isc_socket_t *sock0, isc_sockaddr_t *addr,
+		   isc_task_t *task, isc_taskaction_t action, void *arg)
+{
+	isc__socket_t *sock = (isc__socket_t *)sock0;
+	isc_socket_connev_t *dev;
+	isc_task_t *ntask = NULL;
+	isc__socketmgr_t *manager;
+	int cc;
+	char strbuf[ISC_STRERRORSIZE];
+	char addrbuf[ISC_SOCKADDR_FORMATSIZE];
+
+	REQUIRE(VALID_SOCKET(sock));
+	REQUIRE(addr != NULL);
+	REQUIRE(task != NULL);
+	REQUIRE(action != NULL);
+
+	manager = sock->manager;
+	REQUIRE(VALID_MANAGER(manager));
+	REQUIRE(addr != NULL);
+
+	if (isc_sockaddr_ismulticast(addr))
+		return (ISC_R_MULTICAST);
+
+	LOCK(&sock->lock);
+
+	dev = (isc_socket_connev_t *)isc_event_allocate(manager->mctx, sock,
+							ISC_SOCKEVENT_CONNECT,
+							action,	arg,
+							sizeof(*dev));
+	if (dev == NULL) {
+		UNLOCK(&sock->lock);
+		return (ISC_R_NOMEMORY);
+	}
+	ISC_LINK_INIT(dev, ev_link);
+
+	if (sock->connecting) {
+		INSIST(isc_sockaddr_equal(&sock->peer_address, addr));
+		goto queue;
+	}
+
+	if (sock->connected) {
+		INSIST(isc_sockaddr_equal(&sock->peer_address, addr));
+		dev->result = ISC_R_SUCCESS;
+		isc_task_send(task, ISC_EVENT_PTR(&dev));
+
+		UNLOCK(&sock->lock);
+
+		return (ISC_R_SUCCESS);
+	}
+
+	/*
+	 * Try to do the connect right away, as there can be only one
+	 * outstanding, and it might happen to complete.
+	 */
+	sock->peer_address = *addr;
+	cc = connect(sock->fd, &addr->type.sa, addr->length);
+	if (cc < 0) {
+		/*
+		 * HP-UX "fails" to connect a UDP socket and sets errno to
+		 * EINPROGRESS if it's non-blocking.  We'd rather regard this as
+		 * a success and let the user detect it if it's really an error
+		 * at the time of sending a packet on the socket.
+		 */
+		if (sock->type == isc_sockettype_udp && errno == EINPROGRESS) {
+			cc = 0;
+			goto success;
+		}
+		if (SOFT_ERROR(errno) || errno == EINPROGRESS)
+			goto queue;
+
+		switch (errno) {
+#define ERROR_MATCH(a, b) case a: dev->result = b; goto err_exit;
+			ERROR_MATCH(EACCES, ISC_R_NOPERM);
+			ERROR_MATCH(EADDRNOTAVAIL, ISC_R_ADDRNOTAVAIL);
+			ERROR_MATCH(EAFNOSUPPORT, ISC_R_ADDRNOTAVAIL);
+			ERROR_MATCH(ECONNREFUSED, ISC_R_CONNREFUSED);
+			ERROR_MATCH(EHOSTUNREACH, ISC_R_HOSTUNREACH);
+#ifdef EHOSTDOWN
+			ERROR_MATCH(EHOSTDOWN, ISC_R_HOSTUNREACH);
+#endif
+			ERROR_MATCH(ENETUNREACH, ISC_R_NETUNREACH);
+			ERROR_MATCH(ENOBUFS, ISC_R_NORESOURCES);
+			ERROR_MATCH(EPERM, ISC_R_HOSTUNREACH);
+			ERROR_MATCH(EPIPE, ISC_R_NOTCONNECTED);
+			ERROR_MATCH(ECONNRESET, ISC_R_CONNECTIONRESET);
+#undef ERROR_MATCH
+		}
+
+		sock->connected = 0;
+
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		isc_sockaddr_format(addr, addrbuf, sizeof(addrbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__, "connect(%s) %d/%s",
+				 addrbuf, errno, strbuf);
+
+		UNLOCK(&sock->lock);
+		inc_stats(sock->manager->stats,
+			  sock->statsindex[STATID_CONNECTFAIL]);
+		isc_event_free(ISC_EVENT_PTR(&dev));
+		return (ISC_R_UNEXPECTED);
+
+	err_exit:
+		sock->connected = 0;
+		isc_task_send(task, ISC_EVENT_PTR(&dev));
+
+		UNLOCK(&sock->lock);
+		inc_stats(sock->manager->stats,
+			  sock->statsindex[STATID_CONNECTFAIL]);
+		return (ISC_R_SUCCESS);
+	}
+
+	/*
+	 * If connect completed, fire off the done event.
+	 */
+ success:
+	if (cc == 0) {
+		sock->connected = 1;
+		sock->bound = 1;
+		dev->result = ISC_R_SUCCESS;
+		isc_task_send(task, ISC_EVENT_PTR(&dev));
+
+		UNLOCK(&sock->lock);
+
+		inc_stats(sock->manager->stats,
+			  sock->statsindex[STATID_CONNECT]);
+
+		return (ISC_R_SUCCESS);
+	}
+
+ queue:
+
+	/*
+	 * Attach to task.
+	 */
+	isc_task_attach(task, &ntask);
+
+	dev->ev_sender = ntask;
+
+	/*
+	 * Poke watcher here.  We still have the socket locked, so there
+	 * is no race condition.  We will keep the lock for such a short
+	 * bit of time waking it up now or later won't matter all that much.
+	 */
+	if (ISC_LIST_EMPTY(sock->connect_list) && !sock->connecting)
+		select_poke(manager, sock->fd, SELECT_POKE_CONNECT);
+
+	sock->connecting = 1;
+
+	ISC_LIST_ENQUEUE(sock->connect_list, dev, ev_link);
+
+	UNLOCK(&sock->lock);
+	return (ISC_R_SUCCESS);
+}
+
+/*
+ * Called when a socket with a pending connect() finishes.
+ */
+static void
+internal_connect(isc_task_t *me, isc_event_t *ev) {
+	isc__socket_t *sock;
+	isc_socket_connev_t *dev;
+	int cc;
+	isc_result_t result;
+	ISC_SOCKADDR_LEN_T optlen;
+	char strbuf[ISC_STRERRORSIZE];
+	char peerbuf[ISC_SOCKADDR_FORMATSIZE];
+
+	UNUSED(me);
+	INSIST(ev->ev_type == ISC_SOCKEVENT_INTW);
+
+	sock = ev->ev_sender;
+	INSIST(VALID_SOCKET(sock));
+
+	LOCK(&sock->lock);
+
+	/*
+	 * When the internal event was sent the reference count was bumped
+	 * to keep the socket around for us.  Decrement the count here.
+	 */
+	INSIST(sock->references > 0);
+	sock->references--;
+	if (sock->references == 0) {
+		UNLOCK(&sock->lock);
+		destroy(&sock);
+		return;
+	}
+
+	/*
+	 * Get the first item off the connect list.
+	 * If it is empty, unlock the socket and return.
+	 */
+	dev = ISC_LIST_HEAD(sock->connect_list);
+	if (dev == NULL) {
+		INSIST(!sock->connecting);
+		UNLOCK(&sock->lock);
+		return;
+	}
+
+	INSIST(sock->connecting);
+	sock->connecting = 0;
+
+	/*
+	 * Get any possible error status here.
+	 */
+	optlen = sizeof(cc);
+	if (getsockopt(sock->fd, SOL_SOCKET, SO_ERROR,
+		       (void *)&cc, (void *)&optlen) != 0)
+		cc = errno;
+	else
+		errno = cc;
+
+	if (errno != 0) {
+		/*
+		 * If the error is EAGAIN, just re-select on this
+		 * fd and pretend nothing strange happened.
+		 */
+		if (SOFT_ERROR(errno) || errno == EINPROGRESS) {
+			sock->connecting = 1;
+			select_poke(sock->manager, sock->fd,
+				    SELECT_POKE_CONNECT);
+			UNLOCK(&sock->lock);
+
+			return;
+		}
+
+		inc_stats(sock->manager->stats,
+			  sock->statsindex[STATID_CONNECTFAIL]);
+
+		/*
+		 * Translate other errors into ISC_R_* flavors.
+		 */
+		switch (errno) {
+#define ERROR_MATCH(a, b) case a: result = b; break;
+			ERROR_MATCH(EACCES, ISC_R_NOPERM);
+			ERROR_MATCH(EADDRNOTAVAIL, ISC_R_ADDRNOTAVAIL);
+			ERROR_MATCH(EAFNOSUPPORT, ISC_R_ADDRNOTAVAIL);
+			ERROR_MATCH(ECONNREFUSED, ISC_R_CONNREFUSED);
+			ERROR_MATCH(EHOSTUNREACH, ISC_R_HOSTUNREACH);
+#ifdef EHOSTDOWN
+			ERROR_MATCH(EHOSTDOWN, ISC_R_HOSTUNREACH);
+#endif
+			ERROR_MATCH(ENETUNREACH, ISC_R_NETUNREACH);
+			ERROR_MATCH(ENOBUFS, ISC_R_NORESOURCES);
+			ERROR_MATCH(EPERM, ISC_R_HOSTUNREACH);
+			ERROR_MATCH(EPIPE, ISC_R_NOTCONNECTED);
+			ERROR_MATCH(ETIMEDOUT, ISC_R_TIMEDOUT);
+			ERROR_MATCH(ECONNRESET, ISC_R_CONNECTIONRESET);
+#undef ERROR_MATCH
+		default:
+			result = ISC_R_UNEXPECTED;
+			isc_sockaddr_format(&sock->peer_address, peerbuf,
+					    sizeof(peerbuf));
+			isc__strerror(errno, strbuf, sizeof(strbuf));
+			UNEXPECTED_ERROR(__FILE__, __LINE__,
+					 "internal_connect: connect(%s) %s",
+					 peerbuf, strbuf);
+		}
+	} else {
+		inc_stats(sock->manager->stats,
+			  sock->statsindex[STATID_CONNECT]);
+		result = ISC_R_SUCCESS;
+		sock->connected = 1;
+		sock->bound = 1;
+	}
+
+	do {
+		dev->result = result;
+		send_connectdone_event(sock, &dev);
+		dev = ISC_LIST_HEAD(sock->connect_list);
+	} while (dev != NULL);
+
+	UNLOCK(&sock->lock);
+}
+
+isc_result_t
+isc__socket_getpeername(isc_socket_t *sock0, isc_sockaddr_t *addressp) {
+	isc__socket_t *sock = (isc__socket_t *)sock0;
+	isc_result_t result;
+
+	REQUIRE(VALID_SOCKET(sock));
+	REQUIRE(addressp != NULL);
+
+	LOCK(&sock->lock);
+
+	if (sock->connected) {
+		*addressp = sock->peer_address;
+		result = ISC_R_SUCCESS;
+	} else {
+		result = ISC_R_NOTCONNECTED;
+	}
+
+	UNLOCK(&sock->lock);
+
+	return (result);
+}
+
+isc_result_t
+isc__socket_getsockname(isc_socket_t *sock0, isc_sockaddr_t *addressp) {
+	isc__socket_t *sock = (isc__socket_t *)sock0;
+	ISC_SOCKADDR_LEN_T len;
+	isc_result_t result;
+	char strbuf[ISC_STRERRORSIZE];
+
+	REQUIRE(VALID_SOCKET(sock));
+	REQUIRE(addressp != NULL);
+
+	LOCK(&sock->lock);
+
+	if (!sock->bound) {
+		result = ISC_R_NOTBOUND;
+		goto out;
+	}
+
+	result = ISC_R_SUCCESS;
+
+	len = sizeof(addressp->type);
+	if (getsockname(sock->fd, &addressp->type.sa, (void *)&len) < 0) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__, "getsockname: %s",
+				 strbuf);
+		result = ISC_R_UNEXPECTED;
+		goto out;
+	}
+	addressp->length = (unsigned int)len;
+
+ out:
+	UNLOCK(&sock->lock);
+
+	return (result);
+}
+
+/*
+ * Run through the list of events on this socket, and cancel the ones
+ * queued for task "task" of type "how".  "how" is a bitmask.
+ */
+void
+isc__socket_cancel(isc_socket_t *sock0, isc_task_t *task, unsigned int how) {
+	isc__socket_t *sock = (isc__socket_t *)sock0;
+
+	REQUIRE(VALID_SOCKET(sock));
+
+	/*
+	 * Quick exit if there is nothing to do.  Don't even bother locking
+	 * in this case.
+	 */
+	if (how == 0)
+		return;
+
+	LOCK(&sock->lock);
+
+	/*
+	 * All of these do the same thing, more or less.
+	 * Each will:
+	 *	o If the internal event is marked as "posted" try to
+	 *	  remove it from the task's queue.  If this fails, mark it
+	 *	  as canceled instead, and let the task clean it up later.
+	 *	o For each I/O request for that task of that type, post
+	 *	  its done event with status of "ISC_R_CANCELED".
+	 *	o Reset any state needed.
+	 */
+	if (((how & ISC_SOCKCANCEL_RECV) == ISC_SOCKCANCEL_RECV)
+	    && !ISC_LIST_EMPTY(sock->recv_list)) {
+		isc_socketevent_t      *dev;
+		isc_socketevent_t      *next;
+		isc_task_t	       *current_task;
+
+		dev = ISC_LIST_HEAD(sock->recv_list);
+
+		while (dev != NULL) {
+			current_task = dev->ev_sender;
+			next = ISC_LIST_NEXT(dev, ev_link);
+
+			if ((task == NULL) || (task == current_task)) {
+				dev->result = ISC_R_CANCELED;
+				send_recvdone_event(sock, &dev);
+			}
+			dev = next;
+		}
+	}
+
+	if (((how & ISC_SOCKCANCEL_SEND) == ISC_SOCKCANCEL_SEND)
+	    && !ISC_LIST_EMPTY(sock->send_list)) {
+		isc_socketevent_t      *dev;
+		isc_socketevent_t      *next;
+		isc_task_t	       *current_task;
+
+		dev = ISC_LIST_HEAD(sock->send_list);
+
+		while (dev != NULL) {
+			current_task = dev->ev_sender;
+			next = ISC_LIST_NEXT(dev, ev_link);
+
+			if ((task == NULL) || (task == current_task)) {
+				dev->result = ISC_R_CANCELED;
+				send_senddone_event(sock, &dev);
+			}
+			dev = next;
+		}
+	}
+
+	if (((how & ISC_SOCKCANCEL_ACCEPT) == ISC_SOCKCANCEL_ACCEPT)
+	    && !ISC_LIST_EMPTY(sock->accept_list)) {
+		isc_socket_newconnev_t *dev;
+		isc_socket_newconnev_t *next;
+		isc_task_t	       *current_task;
+
+		dev = ISC_LIST_HEAD(sock->accept_list);
+		while (dev != NULL) {
+			current_task = dev->ev_sender;
+			next = ISC_LIST_NEXT(dev, ev_link);
+
+			if ((task == NULL) || (task == current_task)) {
+
+				ISC_LIST_UNLINK(sock->accept_list, dev,
+						ev_link);
+
+				NEWCONNSOCK(dev)->references--;
+				free_socket((isc__socket_t **)&dev->newsocket);
+
+				dev->result = ISC_R_CANCELED;
+				dev->ev_sender = sock;
+				isc_task_sendanddetach(&current_task,
+						       ISC_EVENT_PTR(&dev));
+			}
+
+			dev = next;
+		}
+	}
+
+	if (((how & ISC_SOCKCANCEL_CONNECT) == ISC_SOCKCANCEL_CONNECT)
+	    && !ISC_LIST_EMPTY(sock->connect_list)) {
+		isc_socket_connev_t    *dev;
+		isc_socket_connev_t    *next;
+		isc_task_t	       *current_task;
+
+		INSIST(sock->connecting);
+		sock->connecting = 0;
+
+		dev = ISC_LIST_HEAD(sock->connect_list);
+
+		while (dev != NULL) {
+			current_task = dev->ev_sender;
+			next = ISC_LIST_NEXT(dev, ev_link);
+
+			if ((task == NULL) || (task == current_task)) {
+				dev->result = ISC_R_CANCELED;
+				send_connectdone_event(sock, &dev);
+			}
+			dev = next;
+		}
+	}
+
+	UNLOCK(&sock->lock);
+}
+
+isc_sockettype_t
+isc__socket_gettype(isc_socket_t *sock0) {
+	isc__socket_t *sock = (isc__socket_t *)sock0;
+
+	REQUIRE(VALID_SOCKET(sock));
+
+	return (sock->type);
+}
+
+bool
+isc__socket_isbound(isc_socket_t *sock0) {
+	isc__socket_t *sock = (isc__socket_t *)sock0;
+	bool val;
+
+	REQUIRE(VALID_SOCKET(sock));
+
+	LOCK(&sock->lock);
+	val = ((sock->bound) ? true : false);
+	UNLOCK(&sock->lock);
+
+	return (val);
+}
+
+void
+isc__socket_ipv6only(isc_socket_t *sock0, bool yes) {
+	isc__socket_t *sock = (isc__socket_t *)sock0;
+#if defined(IPV6_V6ONLY)
+	int onoff = yes ? 1 : 0;
+#else
+	UNUSED(yes);
+	UNUSED(sock);
+#endif
+
+	REQUIRE(VALID_SOCKET(sock));
+	INSIST(!sock->dupped);
+
+#ifdef IPV6_V6ONLY
+	if (sock->pf == AF_INET6) {
+		if (setsockopt(sock->fd, IPPROTO_IPV6, IPV6_V6ONLY,
+			       (void *)&onoff, sizeof(int)) < 0) {
+			char strbuf[ISC_STRERRORSIZE];
+			isc__strerror(errno, strbuf, sizeof(strbuf));
+			UNEXPECTED_ERROR(__FILE__, __LINE__,
+					 "setsockopt(%d, IPV6_V6ONLY) "
+					 "%s: %s", sock->fd,
+					 isc_msgcat_get(isc_msgcat,
+							ISC_MSGSET_GENERAL,
+							ISC_MSG_FAILED,
+							"failed"),
+					 strbuf);
+		}
+	}
+	FIX_IPV6_RECVPKTINFO(sock);	/* AIX */
+#endif
+}
+
+static void
+setdscp(isc__socket_t *sock, isc_dscp_t dscp) {
+#if defined(IP_TOS) || defined(IPV6_TCLASS)
+	int value = dscp << 2;
+#endif
+
+	sock->dscp = dscp;
+
+#ifdef IP_TOS
+	if (sock->pf == AF_INET) {
+		if (setsockopt(sock->fd, IPPROTO_IP, IP_TOS,
+			       (void *)&value, sizeof(value)) < 0) {
+			char strbuf[ISC_STRERRORSIZE];
+			isc__strerror(errno, strbuf, sizeof(strbuf));
+			UNEXPECTED_ERROR(__FILE__, __LINE__,
+					 "setsockopt(%d, IP_TOS, %.02x) "
+					 "%s: %s", sock->fd, value >> 2,
+					 isc_msgcat_get(isc_msgcat,
+							ISC_MSGSET_GENERAL,
+							ISC_MSG_FAILED,
+							"failed"),
+					 strbuf);
+		}
+	}
+#endif
+#ifdef IPV6_TCLASS
+	if (sock->pf == AF_INET6) {
+		if (setsockopt(sock->fd, IPPROTO_IPV6, IPV6_TCLASS,
+			       (void *)&value, sizeof(value)) < 0) {
+			char strbuf[ISC_STRERRORSIZE];
+			isc__strerror(errno, strbuf, sizeof(strbuf));
+			UNEXPECTED_ERROR(__FILE__, __LINE__,
+					 "setsockopt(%d, IPV6_TCLASS, %.02x) "
+					 "%s: %s", sock->fd, dscp >> 2,
+					 isc_msgcat_get(isc_msgcat,
+							ISC_MSGSET_GENERAL,
+							ISC_MSG_FAILED,
+							"failed"),
+					 strbuf);
+		}
+	}
+#endif
+}
+
+void
+isc__socket_dscp(isc_socket_t *sock0, isc_dscp_t dscp) {
+	isc__socket_t *sock = (isc__socket_t *)sock0;
+
+	REQUIRE(VALID_SOCKET(sock));
+	REQUIRE(dscp < 0x40);
+
+#if !defined(IP_TOS) && !defined(IPV6_TCLASS)
+	UNUSED(dscp);
+#else
+	if (dscp < 0)
+		return;
+
+	/* The DSCP value must not be changed once it has been set. */
+	if (isc_dscp_check_value != -1)
+		INSIST(dscp == isc_dscp_check_value);
+#endif
+
+
+#ifdef notyet
+	REQUIRE(!sock->dupped);
+#endif
+
+	setdscp(sock, dscp);
+}
+
+isc_socketevent_t *
+isc_socket_socketevent(isc_mem_t *mctx, void *sender,
+			isc_eventtype_t eventtype, isc_taskaction_t action,
+			void *arg)
+{
+	return (allocate_socketevent(mctx, sender, eventtype, action, arg));
+}
+
+#ifndef USE_WATCHER_THREAD
+/*
+ * In our assumed scenario, we can simply use a single static object.
+ * XXX: this is not true if the application uses multiple threads with
+ *      'multi-context' mode.  Fixing this is a future TODO item.
+ */
+static isc_socketwait_t swait_private;
+
+int
+isc__socketmgr_waitevents(isc_socketmgr_t *manager0, struct timeval *tvp,
+			  isc_socketwait_t **swaitp)
+{
+	isc__socketmgr_t *manager = (isc__socketmgr_t *)manager0;
+	int n;
+#ifdef USE_KQUEUE
+	struct timespec ts, *tsp;
+#endif
+#ifdef USE_EPOLL
+	int timeout;
+#endif
+#ifdef USE_DEVPOLL
+	isc_result_t result;
+	int pass;
+	struct dvpoll dvp;
+#endif
+
+	REQUIRE(swaitp != NULL && *swaitp == NULL);
+
+#ifdef USE_SHARED_MANAGER
+	if (manager == NULL)
+		manager = socketmgr;
+#endif
+	if (manager == NULL)
+		return (0);
+
+#ifdef USE_KQUEUE
+	if (tvp != NULL) {
+		ts.tv_sec = tvp->tv_sec;
+		ts.tv_nsec = tvp->tv_usec * 1000;
+		tsp = &ts;
+	} else
+		tsp = NULL;
+	swait_private.nevents = kevent(manager->kqueue_fd, NULL, 0,
+				       manager->events, manager->nevents,
+				       tsp);
+	n = swait_private.nevents;
+#elif defined(USE_EPOLL)
+	if (tvp != NULL)
+		timeout = tvp->tv_sec * 1000 + (tvp->tv_usec + 999) / 1000;
+	else
+		timeout = -1;
+	swait_private.nevents = epoll_wait(manager->epoll_fd,
+					   manager->events,
+					   manager->nevents, timeout);
+	n = swait_private.nevents;
+#elif defined(USE_DEVPOLL)
+	/*
+	 * Re-probe every thousand calls.
+	 */
+	if (manager->calls++ > 1000U) {
+		result = isc_resource_getcurlimit(isc_resource_openfiles,
+						  &manager->open_max);
+		if (result != ISC_R_SUCCESS)
+			manager->open_max = 64;
+		manager->calls = 0;
+	}
+	for (pass = 0; pass < 2; pass++) {
+		dvp.dp_fds = manager->events;
+		dvp.dp_nfds = manager->nevents;
+		if (dvp.dp_nfds >= manager->open_max)
+			dvp.dp_nfds = manager->open_max - 1;
+		if (tvp != NULL) {
+			dvp.dp_timeout = tvp->tv_sec * 1000 +
+				(tvp->tv_usec + 999) / 1000;
+		} else
+			dvp.dp_timeout = -1;
+		n = ioctl(manager->devpoll_fd, DP_POLL, &dvp);
+		if (n == -1 && errno == EINVAL) {
+			/*
+			 * {OPEN_MAX} may have dropped.  Look
+			 * up the current value and try again.
+			 */
+			result = isc_resource_getcurlimit(
+							isc_resource_openfiles,
+							&manager->open_max);
+			if (result != ISC_R_SUCCESS)
+				manager->open_max = 64;
+		} else
+			break;
+	}
+	swait_private.nevents = n;
+#elif defined(USE_SELECT)
+	memmove(manager->read_fds_copy, manager->read_fds, manager->fd_bufsize);
+	memmove(manager->write_fds_copy, manager->write_fds,
+		manager->fd_bufsize);
+
+	swait_private.readset = manager->read_fds_copy;
+	swait_private.writeset = manager->write_fds_copy;
+	swait_private.maxfd = manager->maxfd + 1;
+
+	n = select(swait_private.maxfd, swait_private.readset,
+		   swait_private.writeset, NULL, tvp);
+#endif
+
+	*swaitp = &swait_private;
+	return (n);
+}
+
+isc_result_t
+isc__socketmgr_dispatch(isc_socketmgr_t *manager0, isc_socketwait_t *swait) {
+	isc__socketmgr_t *manager = (isc__socketmgr_t *)manager0;
+
+	REQUIRE(swait == &swait_private);
+
+#ifdef USE_SHARED_MANAGER
+	if (manager == NULL)
+		manager = socketmgr;
+#endif
+	if (manager == NULL)
+		return (ISC_R_NOTFOUND);
+
+#if defined(USE_KQUEUE) || defined(USE_EPOLL) || defined(USE_DEVPOLL)
+	(void)process_fds(manager, manager->events, swait->nevents);
+	return (ISC_R_SUCCESS);
+#elif defined(USE_SELECT)
+	process_fds(manager, swait->maxfd, swait->readset, swait->writeset);
+	return (ISC_R_SUCCESS);
+#endif
+}
+#endif /* USE_WATCHER_THREAD */
+
+void
+isc__socket_setname(isc_socket_t *socket0, const char *name, void *tag) {
+	isc__socket_t *sock = (isc__socket_t *)socket0;
+
+	/*
+	 * Name 'sock'.
+	 */
+
+	REQUIRE(VALID_SOCKET(sock));
+
+	LOCK(&sock->lock);
+	strlcpy(sock->name, name, sizeof(sock->name));
+	sock->tag = tag;
+	UNLOCK(&sock->lock);
+}
+
+const char *
+isc__socket_getname(isc_socket_t *socket0) {
+	isc__socket_t *sock = (isc__socket_t *)socket0;
+
+	return (sock->name);
+}
+
+void *
+isc__socket_gettag(isc_socket_t *socket0) {
+	isc__socket_t *sock = (isc__socket_t *)socket0;
+
+	return (sock->tag);
+}
+
+isc_result_t
+isc__socket_register(void) {
+	return (isc_socket_register(isc__socketmgr_create));
+}
+
+int
+isc__socket_getfd(isc_socket_t *socket0) {
+	isc__socket_t *sock = (isc__socket_t *)socket0;
+
+	return ((short) sock->fd);
+}
+
+#if defined(HAVE_LIBXML2) || defined(HAVE_JSON)
+static const char *
+_socktype(isc_sockettype_t type)
+{
+	if (type == isc_sockettype_udp)
+		return ("udp");
+	else if (type == isc_sockettype_tcp)
+		return ("tcp");
+	else if (type == isc_sockettype_unix)
+		return ("unix");
+	else if (type == isc_sockettype_fdwatch)
+		return ("fdwatch");
+	else
+		return ("not-initialized");
+}
+#endif
+
+#ifdef HAVE_LIBXML2
+#define TRY0(a) do { xmlrc = (a); if (xmlrc < 0) goto error; } while(0)
+int
+isc_socketmgr_renderxml(isc_socketmgr_t *mgr0, xmlTextWriterPtr writer) {
+	isc__socketmgr_t *mgr = (isc__socketmgr_t *)mgr0;
+	isc__socket_t *sock = NULL;
+	char peerbuf[ISC_SOCKADDR_FORMATSIZE];
+	isc_sockaddr_t addr;
+	ISC_SOCKADDR_LEN_T len;
+	int xmlrc;
+
+	LOCK(&mgr->lock);
+
+#ifdef USE_SHARED_MANAGER
+	TRY0(xmlTextWriterStartElement(writer, ISC_XMLCHAR "references"));
+	TRY0(xmlTextWriterWriteFormatString(writer, "%d", mgr->refs));
+	TRY0(xmlTextWriterEndElement(writer));
+#endif	/* USE_SHARED_MANAGER */
+
+	TRY0(xmlTextWriterStartElement(writer, ISC_XMLCHAR "sockets"));
+	sock = ISC_LIST_HEAD(mgr->socklist);
+	while (sock != NULL) {
+		LOCK(&sock->lock);
+		TRY0(xmlTextWriterStartElement(writer, ISC_XMLCHAR "socket"));
+
+		TRY0(xmlTextWriterStartElement(writer, ISC_XMLCHAR "id"));
+		TRY0(xmlTextWriterWriteFormatString(writer, "%p", sock));
+		TRY0(xmlTextWriterEndElement(writer));
+
+		if (sock->name[0] != 0) {
+			TRY0(xmlTextWriterStartElement(writer,
+						       ISC_XMLCHAR "name"));
+			TRY0(xmlTextWriterWriteFormatString(writer, "%s",
+							    sock->name));
+			TRY0(xmlTextWriterEndElement(writer)); /* name */
+		}
+
+		TRY0(xmlTextWriterStartElement(writer,
+					       ISC_XMLCHAR "references"));
+		TRY0(xmlTextWriterWriteFormatString(writer, "%d",
+						    sock->references));
+		TRY0(xmlTextWriterEndElement(writer));
+
+		TRY0(xmlTextWriterWriteElement(writer, ISC_XMLCHAR "type",
+					  ISC_XMLCHAR _socktype(sock->type)));
+
+		if (sock->connected) {
+			isc_sockaddr_format(&sock->peer_address, peerbuf,
+					    sizeof(peerbuf));
+			TRY0(xmlTextWriterWriteElement(writer,
+						  ISC_XMLCHAR "peer-address",
+						  ISC_XMLCHAR peerbuf));
+		}
+
+		len = sizeof(addr);
+		if (getsockname(sock->fd, &addr.type.sa, (void *)&len) == 0) {
+			isc_sockaddr_format(&addr, peerbuf, sizeof(peerbuf));
+			TRY0(xmlTextWriterWriteElement(writer,
+						  ISC_XMLCHAR "local-address",
+						  ISC_XMLCHAR peerbuf));
+		}
+
+		TRY0(xmlTextWriterStartElement(writer, ISC_XMLCHAR "states"));
+		if (sock->pending_recv)
+			TRY0(xmlTextWriterWriteElement(writer,
+						ISC_XMLCHAR "state",
+						ISC_XMLCHAR "pending-receive"));
+		if (sock->pending_send)
+			TRY0(xmlTextWriterWriteElement(writer,
+						  ISC_XMLCHAR "state",
+						  ISC_XMLCHAR "pending-send"));
+		if (sock->pending_accept)
+			TRY0(xmlTextWriterWriteElement(writer,
+						 ISC_XMLCHAR "state",
+						 ISC_XMLCHAR "pending_accept"));
+		if (sock->listener)
+			TRY0(xmlTextWriterWriteElement(writer,
+						       ISC_XMLCHAR "state",
+						       ISC_XMLCHAR "listener"));
+		if (sock->connected)
+			TRY0(xmlTextWriterWriteElement(writer,
+						     ISC_XMLCHAR "state",
+						     ISC_XMLCHAR "connected"));
+		if (sock->connecting)
+			TRY0(xmlTextWriterWriteElement(writer,
+						    ISC_XMLCHAR "state",
+						    ISC_XMLCHAR "connecting"));
+		if (sock->bound)
+			TRY0(xmlTextWriterWriteElement(writer,
+						       ISC_XMLCHAR "state",
+						       ISC_XMLCHAR "bound"));
+
+		TRY0(xmlTextWriterEndElement(writer)); /* states */
+
+		TRY0(xmlTextWriterEndElement(writer)); /* socket */
+
+		UNLOCK(&sock->lock);
+		sock = ISC_LIST_NEXT(sock, link);
+	}
+	TRY0(xmlTextWriterEndElement(writer)); /* sockets */
+
+ error:
+	if (sock != NULL)
+		UNLOCK(&sock->lock);
+
+	UNLOCK(&mgr->lock);
+
+	return (xmlrc);
+}
+#endif /* HAVE_LIBXML2 */
+
+#ifdef HAVE_JSON
+#define CHECKMEM(m) do { \
+	if (m == NULL) { \
+		result = ISC_R_NOMEMORY;\
+		goto error;\
+	} \
+} while(0)
+
+isc_result_t
+isc_socketmgr_renderjson(isc_socketmgr_t *mgr0, json_object *stats) {
+	isc_result_t result = ISC_R_SUCCESS;
+	isc__socketmgr_t *mgr = (isc__socketmgr_t *)mgr0;
+	isc__socket_t *sock = NULL;
+	char peerbuf[ISC_SOCKADDR_FORMATSIZE];
+	isc_sockaddr_t addr;
+	ISC_SOCKADDR_LEN_T len;
+	json_object *obj, *array = json_object_new_array();
+
+	CHECKMEM(array);
+
+	LOCK(&mgr->lock);
+
+#ifdef USE_SHARED_MANAGER
+	obj = json_object_new_int(mgr->refs);
+	CHECKMEM(obj);
+	json_object_object_add(stats, "references", obj);
+#endif	/* USE_SHARED_MANAGER */
+
+	sock = ISC_LIST_HEAD(mgr->socklist);
+	while (sock != NULL) {
+		json_object *states, *entry = json_object_new_object();
+		char buf[255];
+
+		CHECKMEM(entry);
+		json_object_array_add(array, entry);
+
+		LOCK(&sock->lock);
+
+		snprintf(buf, sizeof(buf), "%p", sock);
+		obj = json_object_new_string(buf);
+		CHECKMEM(obj);
+		json_object_object_add(entry, "id", obj);
+
+		if (sock->name[0] != 0) {
+			obj = json_object_new_string(sock->name);
+			CHECKMEM(obj);
+			json_object_object_add(entry, "name", obj);
+		}
+
+		obj = json_object_new_int(sock->references);
+		CHECKMEM(obj);
+		json_object_object_add(entry, "references", obj);
+
+		obj = json_object_new_string(_socktype(sock->type));
+		CHECKMEM(obj);
+		json_object_object_add(entry, "type", obj);
+
+		if (sock->connected) {
+			isc_sockaddr_format(&sock->peer_address, peerbuf,
+					    sizeof(peerbuf));
+			obj = json_object_new_string(peerbuf);
+			CHECKMEM(obj);
+			json_object_object_add(entry, "peer-address", obj);
+		}
+
+		len = sizeof(addr);
+		if (getsockname(sock->fd, &addr.type.sa, (void *)&len) == 0) {
+			isc_sockaddr_format(&addr, peerbuf, sizeof(peerbuf));
+			obj = json_object_new_string(peerbuf);
+			CHECKMEM(obj);
+			json_object_object_add(entry, "local-address", obj);
+		}
+
+		states = json_object_new_array();
+		CHECKMEM(states);
+		json_object_object_add(entry, "states", states);
+
+		if (sock->pending_recv) {
+			obj = json_object_new_string("pending-receive");
+			CHECKMEM(obj);
+			json_object_array_add(states, obj);
+		}
+
+		if (sock->pending_send) {
+			obj = json_object_new_string("pending-send");
+			CHECKMEM(obj);
+			json_object_array_add(states, obj);
+		}
+
+		if (sock->pending_accept) {
+			obj = json_object_new_string("pending-accept");
+			CHECKMEM(obj);
+			json_object_array_add(states, obj);
+		}
+
+		if (sock->listener) {
+			obj = json_object_new_string("listener");
+			CHECKMEM(obj);
+			json_object_array_add(states, obj);
+		}
+
+		if (sock->connected) {
+			obj = json_object_new_string("connected");
+			CHECKMEM(obj);
+			json_object_array_add(states, obj);
+		}
+
+		if (sock->connecting) {
+			obj = json_object_new_string("connecting");
+			CHECKMEM(obj);
+			json_object_array_add(states, obj);
+		}
+
+		if (sock->bound) {
+			obj = json_object_new_string("bound");
+			CHECKMEM(obj);
+			json_object_array_add(states, obj);
+		}
+
+		UNLOCK(&sock->lock);
+		sock = ISC_LIST_NEXT(sock, link);
+	}
+
+	json_object_object_add(stats, "sockets", array);
+	array = NULL;
+	result = ISC_R_SUCCESS;
+
+ error:
+	if (array != NULL)
+		json_object_put(array);
+
+	if (sock != NULL)
+		UNLOCK(&sock->lock);
+
+	UNLOCK(&mgr->lock);
+
+	return (result);
+}
+#endif /* HAVE_JSON */
+
+#include "../socket_api.c"
diff --git a/lib/isc/unix/socket_p.h b/lib/isc/unix/socket_p.h
new file mode 100644
index 0000000..fb4fdb8
--- /dev/null
+++ b/lib/isc/unix/socket_p.h
@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+
+#ifndef ISC_SOCKET_P_H
+#define ISC_SOCKET_P_H
+
+/*! \file */
+
+#ifdef ISC_PLATFORM_NEEDSYSSELECTH
+#include <sys/select.h>
+#endif
+
+typedef struct isc_socketwait isc_socketwait_t;
+int isc__socketmgr_waitevents(isc_socketmgr_t *, struct timeval *,
+			      isc_socketwait_t **);
+isc_result_t isc__socketmgr_dispatch(isc_socketmgr_t *, isc_socketwait_t *);
+#endif /* ISC_SOCKET_P_H */
diff --git a/lib/isc/unix/stdio.c b/lib/isc/unix/stdio.c
new file mode 100644
index 0000000..e60fa65
--- /dev/null
+++ b/lib/isc/unix/stdio.c
@@ -0,0 +1,151 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+
+#include <config.h>
+
+#include <errno.h>
+#include <unistd.h>
+
+#include <isc/stdio.h>
+#include <isc/stat.h>
+#include <isc/util.h>
+
+#include "errno2result.h"
+
+isc_result_t
+isc_stdio_open(const char *filename, const char *mode, FILE **fp) {
+	FILE *f;
+
+	f = fopen(filename, mode);
+	if (f == NULL)
+		return (isc__errno2result(errno));
+	*fp = f;
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc_stdio_close(FILE *f) {
+	int r;
+
+	r = fclose(f);
+	if (r == 0)
+		return (ISC_R_SUCCESS);
+	else
+		return (isc__errno2result(errno));
+}
+
+isc_result_t
+isc_stdio_seek(FILE *f, off_t offset, int whence) {
+	int r;
+
+#ifdef HAVE_FSEEKO
+	r = fseeko(f, offset, whence);
+#else
+	r = fseek(f, offset, whence);
+#endif
+	if (r == 0)
+		return (ISC_R_SUCCESS);
+	else
+		return (isc__errno2result(errno));
+}
+
+isc_result_t
+isc_stdio_tell(FILE *f, off_t *offsetp) {
+	off_t r;
+
+	REQUIRE(offsetp != NULL);
+
+#ifdef HAVE_FTELLO
+	r = ftello(f);
+#else
+	r = ftell(f);
+#endif
+	if (r >= 0) {
+		*offsetp = r;
+		return (ISC_R_SUCCESS);
+	} else
+		return (isc__errno2result(errno));
+}
+
+isc_result_t
+isc_stdio_read(void *ptr, size_t size, size_t nmemb, FILE *f, size_t *nret) {
+	isc_result_t result = ISC_R_SUCCESS;
+	size_t r;
+
+	clearerr(f);
+	r = fread(ptr, size, nmemb, f);
+	if (r != nmemb) {
+		if (feof(f))
+			result = ISC_R_EOF;
+		else
+			result = isc__errno2result(errno);
+	}
+	if (nret != NULL)
+		*nret = r;
+	return (result);
+}
+
+isc_result_t
+isc_stdio_write(const void *ptr, size_t size, size_t nmemb, FILE *f,
+	       size_t *nret)
+{
+	isc_result_t result = ISC_R_SUCCESS;
+	size_t r;
+
+	clearerr(f);
+	r = fwrite(ptr, size, nmemb, f);
+	if (r != nmemb)
+		result = isc__errno2result(errno);
+	if (nret != NULL)
+		*nret = r;
+	return (result);
+}
+
+isc_result_t
+isc_stdio_flush(FILE *f) {
+	int r;
+
+	r = fflush(f);
+	if (r == 0)
+		return (ISC_R_SUCCESS);
+	else
+		return (isc__errno2result(errno));
+}
+
+/*
+ * OpenBSD has deprecated ENOTSUP in favor of EOPNOTSUPP.
+ */
+#if defined(EOPNOTSUPP) && !defined(ENOTSUP)
+#define ENOTSUP EOPNOTSUPP
+#endif
+
+isc_result_t
+isc_stdio_sync(FILE *f) {
+	struct stat buf;
+	int r;
+
+	if (fstat(fileno(f), &buf) != 0)
+		return (isc__errno2result(errno));
+
+	/*
+	 * Only call fsync() on regular files.
+	 */
+	if ((buf.st_mode & S_IFMT) != S_IFREG)
+		return (ISC_R_SUCCESS);
+
+	r = fsync(fileno(f));
+	if (r == 0)
+		return (ISC_R_SUCCESS);
+	else
+		return (isc__errno2result(errno));
+}
+
diff --git a/lib/isc/unix/stdtime.c b/lib/isc/unix/stdtime.c
new file mode 100644
index 0000000..989bde4
--- /dev/null
+++ b/lib/isc/unix/stdtime.c
@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+
+/*! \file */
+
+#include <config.h>
+
+#include <stdbool.h>
+#include <stddef.h>	/* NULL */
+#include <stdlib.h>	/* NULL */
+#include <syslog.h>
+
+#include <sys/time.h>
+
+#include <isc/stdtime.h>
+#include <isc/util.h>
+
+#ifndef ISC_FIX_TV_USEC
+#define ISC_FIX_TV_USEC 1
+#endif
+
+#define US_PER_S 1000000
+
+#if ISC_FIX_TV_USEC
+static inline void
+fix_tv_usec(struct timeval *tv) {
+	bool fixed = false;
+
+	if (tv->tv_usec < 0) {
+		fixed = true;
+		do {
+			tv->tv_sec -= 1;
+			tv->tv_usec += US_PER_S;
+		} while (tv->tv_usec < 0);
+	} else if (tv->tv_usec >= US_PER_S) {
+		fixed = true;
+		do {
+			tv->tv_sec += 1;
+			tv->tv_usec -= US_PER_S;
+		} while (tv->tv_usec >=US_PER_S);
+	}
+	/*
+	 * Call syslog directly as we are called from the logging functions.
+	 */
+	if (fixed)
+		(void)syslog(LOG_ERR, "gettimeofday returned bad tv_usec: corrected");
+}
+#endif
+
+void
+isc_stdtime_get(isc_stdtime_t *t) {
+	struct timeval tv;
+
+	/*
+	 * Set 't' to the number of seconds since 00:00:00 UTC, January 1,
+	 * 1970.
+	 */
+
+	REQUIRE(t != NULL);
+
+	RUNTIME_CHECK(gettimeofday(&tv, NULL) != -1);
+
+#if ISC_FIX_TV_USEC
+	fix_tv_usec(&tv);
+	INSIST(tv.tv_usec >= 0);
+#else
+	INSIST(tv.tv_usec >= 0 && tv.tv_usec < US_PER_S);
+#endif
+
+	*t = (unsigned int)tv.tv_sec;
+}
diff --git a/lib/isc/unix/strerror.c b/lib/isc/unix/strerror.c
new file mode 100644
index 0000000..e4fb793
--- /dev/null
+++ b/lib/isc/unix/strerror.c
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+
+/*! \file */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <string.h>
+
+#include <isc/mutex.h>
+#include <isc/once.h>
+#include <isc/print.h>
+#include <isc/strerror.h>
+#include <isc/util.h>
+
+#ifdef HAVE_STRERROR
+/*%
+ * We need to do this this way for profiled locks.
+ */
+static isc_mutex_t isc_strerror_lock;
+static void init_lock(void) {
+	RUNTIME_CHECK(isc_mutex_init(&isc_strerror_lock) == ISC_R_SUCCESS);
+}
+#else
+extern const char * const sys_errlist[];
+extern const int sys_nerr;
+#endif
+
+void
+isc__strerror(int num, char *buf, size_t size) {
+#ifdef HAVE_STRERROR
+	char *msg;
+	unsigned int unum = (unsigned int)num;
+	static isc_once_t once = ISC_ONCE_INIT;
+
+	REQUIRE(buf != NULL);
+
+	RUNTIME_CHECK(isc_once_do(&once, init_lock) == ISC_R_SUCCESS);
+
+	LOCK(&isc_strerror_lock);
+	msg = strerror(num);
+	if (msg != NULL)
+		snprintf(buf, size, "%s", msg);
+	else
+		snprintf(buf, size, "Unknown error: %u", unum);
+	UNLOCK(&isc_strerror_lock);
+#else
+	unsigned int unum = (unsigned int)num;
+
+	REQUIRE(buf != NULL);
+
+	if (num >= 0 && num < sys_nerr)
+		snprintf(buf, size, "%s", sys_errlist[num]);
+	else
+		snprintf(buf, size, "Unknown error: %u", unum);
+#endif
+}
diff --git a/lib/isc/unix/syslog.c b/lib/isc/unix/syslog.c
new file mode 100644
index 0000000..4ce3272
--- /dev/null
+++ b/lib/isc/unix/syslog.c
@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+
+/*! \file */
+
+#include <config.h>
+
+#include <stdlib.h>
+#include <syslog.h>
+
+#include <isc/result.h>
+#include <isc/string.h>
+#include <isc/syslog.h>
+#include <isc/util.h>
+
+static struct dsn_c_pvt_sfnt {
+	int val;
+	const char *strval;
+} facilities[] = {
+	{ LOG_KERN,			"kern" },
+	{ LOG_USER,			"user" },
+	{ LOG_MAIL,			"mail" },
+	{ LOG_DAEMON,			"daemon" },
+	{ LOG_AUTH,			"auth" },
+	{ LOG_SYSLOG,			"syslog" },
+	{ LOG_LPR,			"lpr" },
+#ifdef LOG_NEWS
+	{ LOG_NEWS,			"news" },
+#endif
+#ifdef LOG_UUCP
+	{ LOG_UUCP,			"uucp" },
+#endif
+#ifdef LOG_CRON
+	{ LOG_CRON,			"cron" },
+#endif
+#ifdef LOG_AUTHPRIV
+	{ LOG_AUTHPRIV,			"authpriv" },
+#endif
+#ifdef LOG_FTP
+	{ LOG_FTP,			"ftp" },
+#endif
+	{ LOG_LOCAL0,			"local0"},
+	{ LOG_LOCAL1,			"local1"},
+	{ LOG_LOCAL2,			"local2"},
+	{ LOG_LOCAL3,			"local3"},
+	{ LOG_LOCAL4,			"local4"},
+	{ LOG_LOCAL5,			"local5"},
+	{ LOG_LOCAL6,			"local6"},
+	{ LOG_LOCAL7,			"local7"},
+	{ 0,				NULL }
+};
+
+isc_result_t
+isc_syslog_facilityfromstring(const char *str, int *facilityp) {
+	int i;
+
+	REQUIRE(str != NULL);
+	REQUIRE(facilityp != NULL);
+
+	for (i = 0; facilities[i].strval != NULL; i++) {
+		if (strcasecmp(facilities[i].strval, str) == 0) {
+			*facilityp = facilities[i].val;
+			return (ISC_R_SUCCESS);
+		}
+	}
+	return (ISC_R_NOTFOUND);
+
+}
diff --git a/lib/isc/unix/time.c b/lib/isc/unix/time.c
new file mode 100644
index 0000000..8edc9df
--- /dev/null
+++ b/lib/isc/unix/time.c
@@ -0,0 +1,500 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+
+/*! \file */
+
+#include <config.h>
+
+#include <errno.h>
+#include <limits.h>
+#include <inttypes.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <syslog.h>
+#include <time.h>
+
+#include <sys/time.h>	/* Required for struct timeval on some platforms. */
+
+#include <isc/log.h>
+#include <isc/platform.h>
+#include <isc/print.h>
+#include <isc/strerror.h>
+#include <isc/string.h>
+#include <isc/time.h>
+#include <isc/tm.h>
+#include <isc/util.h>
+
+#define NS_PER_S	1000000000	/*%< Nanoseconds per second. */
+#define NS_PER_US	1000		/*%< Nanoseconds per microsecond. */
+#define NS_PER_MS	1000000		/*%< Nanoseconds per millisecond. */
+#define US_PER_S	1000000		/*%< Microseconds per second. */
+
+/*
+ * All of the INSIST()s checks of nanoseconds < NS_PER_S are for
+ * consistency checking of the type. In lieu of magic numbers, it
+ * is the best we've got.  The check is only performed on functions which
+ * need an initialized type.
+ */
+
+#ifndef ISC_FIX_TV_USEC
+#define ISC_FIX_TV_USEC 1
+#endif
+
+/*%
+ *** Intervals
+ ***/
+
+static const isc_interval_t zero_interval = { 0, 0 };
+const isc_interval_t * const isc_interval_zero = &zero_interval;
+
+#if ISC_FIX_TV_USEC
+static inline void
+fix_tv_usec(struct timeval *tv) {
+	bool fixed = false;
+
+	if (tv->tv_usec < 0) {
+		fixed = true;
+		do {
+			tv->tv_sec -= 1;
+			tv->tv_usec += US_PER_S;
+		} while (tv->tv_usec < 0);
+	} else if (tv->tv_usec >= US_PER_S) {
+		fixed = true;
+		do {
+			tv->tv_sec += 1;
+			tv->tv_usec -= US_PER_S;
+		} while (tv->tv_usec >=US_PER_S);
+	}
+	/*
+	 * Call syslog directly as was are called from the logging functions.
+	 */
+	if (fixed)
+		(void)syslog(LOG_ERR, "gettimeofday returned bad tv_usec: corrected");
+}
+#endif
+
+void
+isc_interval_set(isc_interval_t *i,
+		 unsigned int seconds, unsigned int nanoseconds)
+{
+	REQUIRE(i != NULL);
+	REQUIRE(nanoseconds < NS_PER_S);
+
+	i->seconds = seconds;
+	i->nanoseconds = nanoseconds;
+}
+
+bool
+isc_interval_iszero(const isc_interval_t *i) {
+	REQUIRE(i != NULL);
+	INSIST(i->nanoseconds < NS_PER_S);
+
+	if (i->seconds == 0 && i->nanoseconds == 0)
+		return (true);
+
+	return (false);
+}
+
+
+/***
+ *** Absolute Times
+ ***/
+
+static const isc_time_t epoch = { 0, 0 };
+const isc_time_t * const isc_time_epoch = &epoch;
+
+void
+isc_time_set(isc_time_t *t, unsigned int seconds, unsigned int nanoseconds) {
+	REQUIRE(t != NULL);
+	REQUIRE(nanoseconds < NS_PER_S);
+
+	t->seconds = seconds;
+	t->nanoseconds = nanoseconds;
+}
+
+void
+isc_time_settoepoch(isc_time_t *t) {
+	REQUIRE(t != NULL);
+
+	t->seconds = 0;
+	t->nanoseconds = 0;
+}
+
+bool
+isc_time_isepoch(const isc_time_t *t) {
+	REQUIRE(t != NULL);
+	INSIST(t->nanoseconds < NS_PER_S);
+
+	if (t->seconds == 0 && t->nanoseconds == 0)
+		return (true);
+
+	return (false);
+}
+
+
+isc_result_t
+isc_time_now(isc_time_t *t) {
+	struct timeval tv;
+	char strbuf[ISC_STRERRORSIZE];
+
+	REQUIRE(t != NULL);
+
+	if (gettimeofday(&tv, NULL) == -1) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__, "%s", strbuf);
+		return (ISC_R_UNEXPECTED);
+	}
+
+	/*
+	 * Does POSIX guarantee the signedness of tv_sec and tv_usec?  If not,
+	 * then this test will generate warnings for platforms on which it is
+	 * unsigned.  In any event, the chances of any of these problems
+	 * happening are pretty much zero, but since the libisc library ensures
+	 * certain things to be true ...
+	 */
+#if ISC_FIX_TV_USEC
+	fix_tv_usec(&tv);
+	if (tv.tv_sec < 0)
+		return (ISC_R_UNEXPECTED);
+#else
+	if (tv.tv_sec < 0 || tv.tv_usec < 0 || tv.tv_usec >= US_PER_S)
+		return (ISC_R_UNEXPECTED);
+#endif
+
+	/*
+	 * Ensure the tv_sec value fits in t->seconds.
+	 */
+	if (sizeof(tv.tv_sec) > sizeof(t->seconds) &&
+	    ((tv.tv_sec | (unsigned int)-1) ^ (unsigned int)-1) != 0U)
+		return (ISC_R_RANGE);
+
+	t->seconds = tv.tv_sec;
+	t->nanoseconds = tv.tv_usec * NS_PER_US;
+
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc_time_nowplusinterval(isc_time_t *t, const isc_interval_t *i) {
+	struct timeval tv;
+	char strbuf[ISC_STRERRORSIZE];
+
+	REQUIRE(t != NULL);
+	REQUIRE(i != NULL);
+	INSIST(i->nanoseconds < NS_PER_S);
+
+	if (gettimeofday(&tv, NULL) == -1) {
+		isc__strerror(errno, strbuf, sizeof(strbuf));
+		UNEXPECTED_ERROR(__FILE__, __LINE__, "%s", strbuf);
+		return (ISC_R_UNEXPECTED);
+	}
+
+	/*
+	 * Does POSIX guarantee the signedness of tv_sec and tv_usec?  If not,
+	 * then this test will generate warnings for platforms on which it is
+	 * unsigned.  In any event, the chances of any of these problems
+	 * happening are pretty much zero, but since the libisc library ensures
+	 * certain things to be true ...
+	 */
+#if ISC_FIX_TV_USEC
+	fix_tv_usec(&tv);
+	if (tv.tv_sec < 0)
+		return (ISC_R_UNEXPECTED);
+#else
+	if (tv.tv_sec < 0 || tv.tv_usec < 0 || tv.tv_usec >= US_PER_S)
+		return (ISC_R_UNEXPECTED);
+#endif
+
+	/*
+	 * Ensure the resulting seconds value fits in the size of an
+	 * unsigned int.  (It is written this way as a slight optimization;
+	 * note that even if both values == INT_MAX, then when added
+	 * and getting another 1 added below the result is UINT_MAX.)
+	 */
+	if ((tv.tv_sec > INT_MAX || i->seconds > INT_MAX) &&
+	    ((long long)tv.tv_sec + i->seconds > UINT_MAX))
+		return (ISC_R_RANGE);
+
+	t->seconds = tv.tv_sec + i->seconds;
+	t->nanoseconds = tv.tv_usec * NS_PER_US + i->nanoseconds;
+	if (t->nanoseconds >= NS_PER_S) {
+		t->seconds++;
+		t->nanoseconds -= NS_PER_S;
+	}
+
+	return (ISC_R_SUCCESS);
+}
+
+int
+isc_time_compare(const isc_time_t *t1, const isc_time_t *t2) {
+	REQUIRE(t1 != NULL && t2 != NULL);
+	INSIST(t1->nanoseconds < NS_PER_S && t2->nanoseconds < NS_PER_S);
+
+	if (t1->seconds < t2->seconds)
+		return (-1);
+	if (t1->seconds > t2->seconds)
+		return (1);
+	if (t1->nanoseconds < t2->nanoseconds)
+		return (-1);
+	if (t1->nanoseconds > t2->nanoseconds)
+		return (1);
+	return (0);
+}
+
+isc_result_t
+isc_time_add(const isc_time_t *t, const isc_interval_t *i, isc_time_t *result)
+{
+	REQUIRE(t != NULL && i != NULL && result != NULL);
+	INSIST(t->nanoseconds < NS_PER_S && i->nanoseconds < NS_PER_S);
+
+	/*
+	 * Ensure the resulting seconds value fits in the size of an
+	 * unsigned int.  (It is written this way as a slight optimization;
+	 * note that even if both values == INT_MAX, then when added
+	 * and getting another 1 added below the result is UINT_MAX.)
+	 */
+	if ((t->seconds > INT_MAX || i->seconds > INT_MAX) &&
+	    ((long long)t->seconds + i->seconds > UINT_MAX))
+		return (ISC_R_RANGE);
+
+	result->seconds = t->seconds + i->seconds;
+	result->nanoseconds = t->nanoseconds + i->nanoseconds;
+	if (result->nanoseconds >= NS_PER_S) {
+		result->seconds++;
+		result->nanoseconds -= NS_PER_S;
+	}
+
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc_time_subtract(const isc_time_t *t, const isc_interval_t *i,
+		  isc_time_t *result)
+{
+	REQUIRE(t != NULL && i != NULL && result != NULL);
+	INSIST(t->nanoseconds < NS_PER_S && i->nanoseconds < NS_PER_S);
+
+	if ((unsigned int)t->seconds < i->seconds ||
+	    ((unsigned int)t->seconds == i->seconds &&
+	     t->nanoseconds < i->nanoseconds))
+	    return (ISC_R_RANGE);
+
+	result->seconds = t->seconds - i->seconds;
+	if (t->nanoseconds >= i->nanoseconds)
+		result->nanoseconds = t->nanoseconds - i->nanoseconds;
+	else {
+		result->nanoseconds = NS_PER_S - i->nanoseconds +
+			t->nanoseconds;
+		result->seconds--;
+	}
+
+	return (ISC_R_SUCCESS);
+}
+
+uint64_t
+isc_time_microdiff(const isc_time_t *t1, const isc_time_t *t2) {
+	uint64_t i1, i2, i3;
+
+	REQUIRE(t1 != NULL && t2 != NULL);
+	INSIST(t1->nanoseconds < NS_PER_S && t2->nanoseconds < NS_PER_S);
+
+	i1 = (uint64_t)t1->seconds * NS_PER_S + t1->nanoseconds;
+	i2 = (uint64_t)t2->seconds * NS_PER_S + t2->nanoseconds;
+
+	if (i1 <= i2)
+		return (0);
+
+	i3 = i1 - i2;
+
+	/*
+	 * Convert to microseconds.
+	 */
+	i3 /= NS_PER_US;
+
+	return (i3);
+}
+
+uint32_t
+isc_time_seconds(const isc_time_t *t) {
+	REQUIRE(t != NULL);
+	INSIST(t->nanoseconds < NS_PER_S);
+
+	return ((uint32_t)t->seconds);
+}
+
+isc_result_t
+isc_time_secondsastimet(const isc_time_t *t, time_t *secondsp) {
+	time_t seconds;
+
+	REQUIRE(t != NULL);
+	INSIST(t->nanoseconds < NS_PER_S);
+
+	/*
+	 * Ensure that the number of seconds represented by t->seconds
+	 * can be represented by a time_t.  Since t->seconds is an unsigned
+	 * int and since time_t is mostly opaque, this is trickier than
+	 * it seems.  (This standardized opaqueness of time_t is *very*
+	 * frustrating; time_t is not even limited to being an integral
+	 * type.)
+	 *
+	 * The mission, then, is to avoid generating any kind of warning
+	 * about "signed versus unsigned" while trying to determine if the
+	 * the unsigned int t->seconds is out range for tv_sec, which is
+	 * pretty much only true if time_t is a signed integer of the same
+	 * size as the return value of isc_time_seconds.
+	 *
+	 * If the paradox in the if clause below is true, t->seconds is out
+	 * of range for time_t.
+	 */
+	seconds = (time_t)t->seconds;
+
+	INSIST(sizeof(unsigned int) == sizeof(uint32_t));
+	INSIST(sizeof(time_t) >= sizeof(uint32_t));
+
+	if (t->seconds > (~0U>>1) && seconds <= (time_t)(~0U>>1))
+		return (ISC_R_RANGE);
+
+	*secondsp = seconds;
+
+	return (ISC_R_SUCCESS);
+}
+
+uint32_t
+isc_time_nanoseconds(const isc_time_t *t) {
+	REQUIRE(t != NULL);
+
+	ENSURE(t->nanoseconds < NS_PER_S);
+
+	return ((uint32_t)t->nanoseconds);
+}
+
+void
+isc_time_formattimestamp(const isc_time_t *t, char *buf, unsigned int len) {
+	time_t now;
+	unsigned int flen;
+#ifdef ISC_PLATFORM_USETHREADS
+	struct tm tm;
+#endif
+
+	REQUIRE(t != NULL);
+	INSIST(t->nanoseconds < NS_PER_S);
+	REQUIRE(buf != NULL);
+	REQUIRE(len > 0);
+
+	now = (time_t) t->seconds;
+#ifdef ISC_PLATFORM_USETHREADS
+	flen = strftime(buf, len, "%d-%b-%Y %X", localtime_r(&now, &tm));
+#else
+	flen = strftime(buf, len, "%d-%b-%Y %X", localtime(&now));
+#endif
+	INSIST(flen < len);
+	if (flen != 0)
+		snprintf(buf + flen, len - flen,
+			 ".%03u", t->nanoseconds / NS_PER_MS);
+	else {
+		strlcpy(buf, "99-Bad-9999 99:99:99.999", len);
+	}
+}
+
+void
+isc_time_formathttptimestamp(const isc_time_t *t, char *buf, unsigned int len) {
+	time_t now;
+	unsigned int flen;
+#ifdef ISC_PLATFORM_USETHREADS
+	struct tm tm;
+#endif
+
+	REQUIRE(t != NULL);
+	INSIST(t->nanoseconds < NS_PER_S);
+	REQUIRE(buf != NULL);
+	REQUIRE(len > 0);
+
+	/*
+	 * 5 spaces, 1 comma, 3 GMT, 2 %d, 4 %Y, 8 %H:%M:%S, 3+ %a, 3+ %b (29+)
+	 */
+	now = (time_t)t->seconds;
+#ifdef ISC_PLATFORM_USETHREADS
+	flen = strftime(buf, len, "%a, %d %b %Y %H:%M:%S GMT",
+			gmtime_r(&now, &tm));
+#else
+	flen = strftime(buf, len, "%a, %d %b %Y %H:%M:%S GMT", gmtime(&now));
+#endif
+	INSIST(flen < len);
+}
+
+isc_result_t
+isc_time_parsehttptimestamp(char *buf, isc_time_t *t) {
+	struct tm t_tm;
+	time_t when;
+	char *p;
+
+	REQUIRE(buf != NULL);
+	REQUIRE(t != NULL);
+
+	p = isc_tm_strptime(buf, "%a, %d %b %Y %H:%M:%S", &t_tm);
+	if (p == NULL)
+		return (ISC_R_UNEXPECTED);
+	when = isc_tm_timegm(&t_tm);
+	if (when == -1)
+		return (ISC_R_UNEXPECTED);
+	isc_time_set(t, when, 0);
+	return (ISC_R_SUCCESS);
+}
+
+void
+isc_time_formatISO8601(const isc_time_t *t, char *buf, unsigned int len) {
+	time_t now;
+	unsigned int flen;
+#ifdef ISC_PLATFORM_USETHREADS
+	struct tm tm;
+#endif
+
+	REQUIRE(t != NULL);
+	INSIST(t->nanoseconds < NS_PER_S);
+	REQUIRE(buf != NULL);
+	REQUIRE(len > 0);
+
+	now = (time_t)t->seconds;
+#ifdef ISC_PLATFORM_USETHREADS
+	flen = strftime(buf, len, "%Y-%m-%dT%H:%M:%SZ", gmtime_r(&now, &tm));
+#else
+	flen = strftime(buf, len, "%Y-%m-%dT%H:%M:%SZ", gmtime(&now));
+#endif
+	INSIST(flen < len);
+}
+
+void
+isc_time_formatISO8601ms(const isc_time_t *t, char *buf, unsigned int len) {
+	time_t now;
+	unsigned int flen;
+#ifdef ISC_PLATFORM_USETHREADS
+	struct tm tm;
+#endif
+
+	REQUIRE(t != NULL);
+	INSIST(t->nanoseconds < NS_PER_S);
+	REQUIRE(buf != NULL);
+	REQUIRE(len > 0);
+
+	now = (time_t)t->seconds;
+#ifdef ISC_PLATFORM_USETHREADS
+	flen = strftime(buf, len, "%Y-%m-%dT%H:%M:%SZ", gmtime_r(&now, &tm));
+#else
+	flen = strftime(buf, len, "%Y-%m-%dT%H:%M:%SZ", gmtime(&now));
+#endif
+	INSIST(flen < len);
+	if (flen > 0U && len - flen >= 5) {
+		flen -= 1; /* rewind one character (Z) */
+		snprintf(buf + flen, len - flen, ".%03uZ",
+			 t->nanoseconds / NS_PER_MS);
+	}
+}