Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

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

1 files changed, 5387 insertions, 0 deletions

diff --git a/nsprpub/pr/src/pthreads/ptio.c b/nsprpub/pr/src/pthreads/ptio.c
new file mode 100644
index 0000000000..a2bc3e714d
--- /dev/null
+++ b/nsprpub/pr/src/pthreads/ptio.c
@@ -0,0 +1,5387 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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/. */
+
+/*
+** File:   ptio.c
+** Descritpion:  Implemenation of I/O methods for pthreads
+*/
+
+#if defined(_PR_PTHREADS)
+
+#if defined(_PR_POLL_WITH_SELECT)
+#if !(defined(HPUX) && defined(_USE_BIG_FDS))
+/* set fd limit for select(), before including system header files */
+#define FD_SETSIZE (16 * 1024)
+#endif
+#endif
+
+#include <pthread.h>
+#include <string.h>  /* for memset() */
+#include <sys/types.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/uio.h>
+#include <sys/file.h>
+#include <sys/ioctl.h>
+#if defined(DARWIN)
+#include <sys/utsname.h> /* for uname */
+#endif
+#if defined(SOLARIS) || defined(UNIXWARE)
+#include <sys/filio.h>  /* to pick up FIONREAD */
+#endif
+#ifdef _PR_POLL_AVAILABLE
+#include <poll.h>
+#endif
+#ifdef AIX
+/* To pick up sysconf() */
+#include <unistd.h>
+#include <dlfcn.h>  /* for dlopen */
+#else
+/* To pick up getrlimit() etc. */
+#include <sys/time.h>
+#include <sys/resource.h>
+#endif
+
+#ifdef SOLARIS
+/*
+ * Define HAVE_SENDFILEV if the system has the sendfilev() system call.
+ * Code built this way won't run on a system without sendfilev().
+ * We can define HAVE_SENDFILEV by default when the minimum release
+ * of Solaris that NSPR supports has sendfilev().
+ */
+#ifdef HAVE_SENDFILEV
+
+#include <sys/sendfile.h>
+
+#define SOLARIS_SENDFILEV(a, b, c, d) sendfilev((a), (b), (c), (d))
+
+#else
+
+#include <dlfcn.h>  /* for dlopen */
+
+/*
+ * Match the definitions in <sys/sendfile.h>.
+ */
+typedef struct sendfilevec {
+    int sfv_fd;       /* input fd */
+    uint_t sfv_flag;  /* flags */
+    off_t sfv_off;    /* offset to start reading from */
+    size_t sfv_len;   /* amount of data */
+} sendfilevec_t;
+
+#define SFV_FD_SELF (-2)
+
+/*
+ * extern ssize_t sendfilev(int, const struct sendfilevec *, int, size_t *);
+ */
+static ssize_t (*pt_solaris_sendfilev_fptr)() = NULL;
+
+#define SOLARIS_SENDFILEV(a, b, c, d) \
+        (*pt_solaris_sendfilev_fptr)((a), (b), (c), (d))
+
+#endif /* HAVE_SENDFILEV */
+#endif /* SOLARIS */
+
+/*
+ * The send_file() system call is available in AIX 4.3.2 or later.
+ * If this file is compiled on an older AIX system, it attempts to
+ * look up the send_file symbol at run time to determine whether
+ * we can use the faster PR_SendFile/PR_TransmitFile implementation based on
+ * send_file().  On AIX 4.3.2 or later, we can safely skip this
+ * runtime function dispatching and just use the send_file based
+ * implementation.
+ */
+#ifdef AIX
+#ifdef SF_CLOSE
+#define HAVE_SEND_FILE
+#endif
+
+#ifdef HAVE_SEND_FILE
+
+#define AIX_SEND_FILE(a, b, c) send_file(a, b, c)
+
+#else /* HAVE_SEND_FILE */
+
+/*
+ * The following definitions match those in <sys/socket.h>
+ * on AIX 4.3.2.
+ */
+
+/*
+ * Structure for the send_file() system call
+ */
+struct sf_parms {
+    /* --------- header parms ---------- */
+    void      *header_data;         /* Input/Output. Points to header buf */
+    uint_t    header_length;        /* Input/Output. Length of the header */
+    /* --------- file parms ------------ */
+    int       file_descriptor;      /* Input. File descriptor of the file */
+    unsigned long long file_size;   /* Output. Size of the file */
+    unsigned long long file_offset; /* Input/Output. Starting offset */
+    long long file_bytes;           /* Input/Output. no. of bytes to send */
+    /* --------- trailer parms --------- */
+    void      *trailer_data;        /* Input/Output. Points to trailer buf */
+    uint_t    trailer_length;       /* Input/Output. Length of the trailer */
+    /* --------- return info ----------- */
+    unsigned long long bytes_sent;  /* Output. no. of bytes sent */
+};
+
+/*
+ * Flags for the send_file() system call
+ */
+#define SF_CLOSE        0x00000001      /* close the socket after completion */
+#define SF_REUSE        0x00000002      /* reuse socket. not supported */
+#define SF_DONT_CACHE   0x00000004      /* don't apply network buffer cache */
+#define SF_SYNC_CACHE   0x00000008      /* sync/update network buffer cache */
+
+/*
+ * prototype: size_t send_file(int *, struct sf_parms *, uint_t);
+ */
+static ssize_t (*pt_aix_sendfile_fptr)() = NULL;
+
+#define AIX_SEND_FILE(a, b, c) (*pt_aix_sendfile_fptr)(a, b, c)
+
+#endif /* HAVE_SEND_FILE */
+#endif /* AIX */
+
+#ifdef LINUX
+#include <sys/sendfile.h>
+#endif
+
+#include "primpl.h"
+
+#if defined(LINUX) || defined(ANDROID)
+#include <netinet/in.h>
+#endif
+
+#ifdef DARWIN
+#include <netinet/in.h>
+#include <netinet/ip.h>
+#endif
+
+#ifdef HAVE_NETINET_TCP_H
+#include <netinet/tcp.h>  /* TCP_NODELAY, TCP_MAXSEG */
+#endif
+
+#ifdef LINUX
+/* TCP_CORK is not defined in <netinet/tcp.h> on Red Hat Linux 6.0 */
+#ifndef TCP_CORK
+#define TCP_CORK 3
+#endif
+#ifndef MSG_FASTOPEN
+#define MSG_FASTOPEN    0x20000000
+#endif
+#endif
+
+#ifdef _PR_IPV6_V6ONLY_PROBE
+static PRBool _pr_ipv6_v6only_on_by_default;
+#endif
+
+#if (defined(HPUX) && !defined(HPUX10_30) && !defined(HPUX11))
+#define _PRSelectFdSetArg_t int *
+#elif defined(AIX4_1)
+#define _PRSelectFdSetArg_t void *
+#elif (defined(AIX) && !defined(AIX4_1)) \
+    || defined(SOLARIS) \
+    || defined(HPUX10_30) || defined(HPUX11) \
+    || defined(LINUX) || defined(__GNU__) || defined(__GLIBC__) \
+    || defined(FREEBSD) || defined(NETBSD) || defined(OPENBSD) \
+    || defined(BSDI) || defined(NTO) || defined(DARWIN) \
+    || defined(UNIXWARE) || defined(RISCOS)
+#define _PRSelectFdSetArg_t fd_set *
+#else
+#error "Cannot determine architecture"
+#endif
+
+#if defined(SOLARIS)
+#ifndef PROTO_SDP
+/* on solaris, SDP is a new type of protocol */
+#define PROTO_SDP   257
+#endif
+#define _PR_HAVE_SDP
+#elif defined(LINUX)
+#ifndef AF_INET_SDP
+/* on linux, SDP is a new type of address family */
+#define AF_INET_SDP 27
+#endif
+#define _PR_HAVE_SDP
+#endif /* LINUX */
+
+static PRFileDesc *pt_SetMethods(
+    PRIntn osfd, PRDescType type, PRBool isAcceptedSocket, PRBool imported);
+
+static PRLock *_pr_flock_lock;  /* For PR_LockFile() etc. */
+static PRCondVar *_pr_flock_cv;  /* For PR_LockFile() etc. */
+static PRLock *_pr_rename_lock;  /* For PR_Rename() */
+
+/**************************************************************************/
+
+/* These two functions are only used in assertions. */
+#if defined(DEBUG)
+
+PRBool IsValidNetAddr(const PRNetAddr *addr)
+{
+    if ((addr != NULL)
+        && (addr->raw.family != AF_UNIX)
+        && (addr->raw.family != PR_AF_INET6)
+        && (addr->raw.family != AF_INET)) {
+        return PR_FALSE;
+    }
+    return PR_TRUE;
+}
+
+static PRBool IsValidNetAddrLen(const PRNetAddr *addr, PRInt32 addr_len)
+{
+    /*
+     * The definition of the length of a Unix domain socket address
+     * is not uniform, so we don't check it.
+     */
+    if ((addr != NULL)
+        && (addr->raw.family != AF_UNIX)
+        && (PR_NETADDR_SIZE(addr) != addr_len)) {
+#if defined(LINUX) && __GLIBC__ == 2 && __GLIBC_MINOR__ == 1
+        /*
+         * In glibc 2.1, struct sockaddr_in6 is 24 bytes.  In glibc 2.2
+         * and in the 2.4 kernel, struct sockaddr_in6 has the scope_id
+         * field and is 28 bytes.  It is possible for socket functions
+         * to return an addr_len greater than sizeof(struct sockaddr_in6).
+         * We need to allow that.  (Bugzilla bug #77264)
+         */
+        if ((PR_AF_INET6 == addr->raw.family)
+            && (sizeof(addr->ipv6) == addr_len)) {
+            return PR_TRUE;
+        }
+#endif
+        return PR_FALSE;
+    }
+    return PR_TRUE;
+}
+
+#endif /* DEBUG */
+
+/*****************************************************************************/
+/************************* I/O Continuation machinery ************************/
+/*****************************************************************************/
+
+/*
+ * The polling interval defines the maximum amount of time that a thread
+ * might hang up before an interrupt is noticed.
+ */
+#define PT_DEFAULT_POLL_MSEC 5000
+#if defined(_PR_POLL_WITH_SELECT)
+#define PT_DEFAULT_SELECT_SEC (PT_DEFAULT_POLL_MSEC/PR_MSEC_PER_SEC)
+#define PT_DEFAULT_SELECT_USEC                          \
+        ((PT_DEFAULT_POLL_MSEC % PR_MSEC_PER_SEC) * PR_USEC_PER_MSEC)
+#endif
+
+/*
+ * pt_SockLen is the type for the length of a socket address
+ * structure, used in the address length argument to bind,
+ * connect, accept, getsockname, getpeername, etc.  Posix.1g
+ * defines this type as socklen_t.  It is size_t or int on
+ * most current systems.
+ */
+#if defined(HAVE_SOCKLEN_T) \
+    || (defined(__GLIBC__) && __GLIBC__ >= 2)
+typedef socklen_t pt_SockLen;
+#elif (defined(AIX) && !defined(AIX4_1))
+typedef PRSize pt_SockLen;
+#else
+typedef PRIntn pt_SockLen;
+#endif
+
+typedef struct pt_Continuation pt_Continuation;
+typedef PRBool (*ContinuationFn)(pt_Continuation *op, PRInt16 revents);
+
+typedef enum pr_ContuationStatus
+{
+    pt_continuation_pending,
+    pt_continuation_done
+} pr_ContuationStatus;
+
+struct pt_Continuation
+{
+    /* The building of the continuation operation */
+    ContinuationFn function;                /* what function to continue */
+    union {
+        PRIntn osfd;
+    } arg1;            /* #1 - the op's fd */
+    union {
+        void* buffer;
+    } arg2;           /* #2 - primary transfer buffer */
+    union {
+        PRSize amount;                      /* #3 - size of 'buffer', or */
+        pt_SockLen *addr_len;                  /*    - length of address */
+#ifdef HPUX11
+        /*
+         * For sendfile()
+         */
+        struct file_spec {
+            off_t offset;                       /* offset in file to send */
+            size_t nbytes;                      /* length of file data to send */
+            size_t st_size;                     /* file size */
+        } file_spec;
+#endif
+    } arg3;
+    union {
+        PRIntn flags;
+    } arg4;           /* #4 - read/write flags */
+    union {
+        PRNetAddr *addr;
+    } arg5;        /* #5 - send/recv address */
+
+#ifdef HPUX11
+    /*
+     * For sendfile()
+     */
+    int filedesc;                           /* descriptor of file to send */
+    int nbytes_to_send;                     /* size of header and file */
+#endif  /* HPUX11 */
+
+#ifdef SOLARIS
+    /*
+     * For sendfilev()
+     */
+    int nbytes_to_send;                     /* size of header and file */
+#endif  /* SOLARIS */
+
+#ifdef LINUX
+    /*
+     * For sendfile()
+     */
+    int in_fd;                              /* descriptor of file to send */
+    off_t offset;
+    size_t count;
+#endif  /* LINUX */
+
+    PRIntervalTime timeout;                 /* client (relative) timeout */
+
+    PRInt16 event;                           /* flags for poll()'s events */
+
+    /*
+    ** The representation and notification of the results of the operation.
+    ** These function can either return an int return code or a pointer to
+    ** some object.
+    */
+    union {
+        PRSize code;
+        void *object;
+    } result;
+
+    PRIntn syserrno;                        /* in case it failed, why (errno) */
+    pr_ContuationStatus status;             /* the status of the operation */
+};
+
+#if defined(DEBUG)
+
+PTDebug pt_debug;  /* this is shared between several modules */
+
+PR_IMPLEMENT(void) PT_FPrintStats(PRFileDesc *debug_out, const char *msg)
+{
+    PTDebug stats;
+    char buffer[100];
+    PRExplodedTime tod;
+    PRInt64 elapsed, aMil;
+    stats = pt_debug;  /* a copy */
+    PR_ExplodeTime(stats.timeStarted, PR_LocalTimeParameters, &tod);
+    (void)PR_FormatTime(buffer, sizeof(buffer), "%T", &tod);
+
+    LL_SUB(elapsed, PR_Now(), stats.timeStarted);
+    LL_I2L(aMil, 1000000);
+    LL_DIV(elapsed, elapsed, aMil);
+
+    if (NULL != msg) {
+        PR_fprintf(debug_out, "%s", msg);
+    }
+    PR_fprintf(
+        debug_out, "\tstarted: %s[%lld]\n", buffer, elapsed);
+    PR_fprintf(
+        debug_out, "\tlocks [created: %u, destroyed: %u]\n",
+        stats.locks_created, stats.locks_destroyed);
+    PR_fprintf(
+        debug_out, "\tlocks [acquired: %u, released: %u]\n",
+        stats.locks_acquired, stats.locks_released);
+    PR_fprintf(
+        debug_out, "\tcvars [created: %u, destroyed: %u]\n",
+        stats.cvars_created, stats.cvars_destroyed);
+    PR_fprintf(
+        debug_out, "\tcvars [notified: %u, delayed_delete: %u]\n",
+        stats.cvars_notified, stats.delayed_cv_deletes);
+}  /* PT_FPrintStats */
+
+#else
+
+PR_IMPLEMENT(void) PT_FPrintStats(PRFileDesc *debug_out, const char *msg)
+{
+    /* do nothing */
+}  /* PT_FPrintStats */
+
+#endif  /* DEBUG */
+
+#if defined(_PR_POLL_WITH_SELECT)
+/*
+ * HPUX report the POLLHUP event for a socket when the
+ * shutdown(SHUT_WR) operation is called for the remote end, even though
+ * the socket is still writeable. Use select(), instead of poll(), to
+ * workaround this problem.
+ */
+static void pt_poll_now_with_select(pt_Continuation *op)
+{
+    PRInt32 msecs;
+    fd_set rd, wr, *rdp, *wrp;
+    struct timeval tv;
+    PRIntervalTime epoch, now, elapsed, remaining;
+    PRBool wait_for_remaining;
+    PRThread *self = PR_GetCurrentThread();
+
+    PR_ASSERT(PR_INTERVAL_NO_WAIT != op->timeout);
+    PR_ASSERT(op->arg1.osfd < FD_SETSIZE);
+
+    switch (op->timeout) {
+        case PR_INTERVAL_NO_TIMEOUT:
+            tv.tv_sec = PT_DEFAULT_SELECT_SEC;
+            tv.tv_usec = PT_DEFAULT_SELECT_USEC;
+            do
+            {
+                PRIntn rv;
+
+                if (op->event & POLLIN) {
+                    FD_ZERO(&rd);
+                    FD_SET(op->arg1.osfd, &rd);
+                    rdp = &rd;
+                } else {
+                    rdp = NULL;
+                }
+                if (op->event & POLLOUT) {
+                    FD_ZERO(&wr);
+                    FD_SET(op->arg1.osfd, &wr);
+                    wrp = &wr;
+                } else {
+                    wrp = NULL;
+                }
+
+                rv = select(op->arg1.osfd + 1, rdp, wrp, NULL, &tv);
+
+                if (_PT_THREAD_INTERRUPTED(self))
+                {
+                    self->state &= ~PT_THREAD_ABORTED;
+                    op->result.code = -1;
+                    op->syserrno = EINTR;
+                    op->status = pt_continuation_done;
+                    return;
+                }
+
+                if ((-1 == rv) && ((errno == EINTR) || (errno == EAGAIN))) {
+                    continue;    /* go around the loop again */
+                }
+
+                if (rv > 0)
+                {
+                    PRInt16 revents = 0;
+
+                    if ((op->event & POLLIN) && FD_ISSET(op->arg1.osfd, &rd)) {
+                        revents |= POLLIN;
+                    }
+                    if ((op->event & POLLOUT) && FD_ISSET(op->arg1.osfd, &wr)) {
+                        revents |= POLLOUT;
+                    }
+
+                    if (op->function(op, revents)) {
+                        op->status = pt_continuation_done;
+                    }
+                } else if (rv == -1) {
+                    op->result.code = -1;
+                    op->syserrno = errno;
+                    op->status = pt_continuation_done;
+                }
+                /* else, select timed out */
+            } while (pt_continuation_done != op->status);
+            break;
+        default:
+            now = epoch = PR_IntervalNow();
+            remaining = op->timeout;
+            do
+            {
+                PRIntn rv;
+
+                if (op->event & POLLIN) {
+                    FD_ZERO(&rd);
+                    FD_SET(op->arg1.osfd, &rd);
+                    rdp = &rd;
+                } else {
+                    rdp = NULL;
+                }
+                if (op->event & POLLOUT) {
+                    FD_ZERO(&wr);
+                    FD_SET(op->arg1.osfd, &wr);
+                    wrp = &wr;
+                } else {
+                    wrp = NULL;
+                }
+
+                wait_for_remaining = PR_TRUE;
+                msecs = (PRInt32)PR_IntervalToMilliseconds(remaining);
+                if (msecs > PT_DEFAULT_POLL_MSEC) {
+                    wait_for_remaining = PR_FALSE;
+                    msecs = PT_DEFAULT_POLL_MSEC;
+                }
+                tv.tv_sec = msecs/PR_MSEC_PER_SEC;
+                tv.tv_usec = (msecs % PR_MSEC_PER_SEC) * PR_USEC_PER_MSEC;
+                rv = select(op->arg1.osfd + 1, rdp, wrp, NULL, &tv);
+
+                if (_PT_THREAD_INTERRUPTED(self))
+                {
+                    self->state &= ~PT_THREAD_ABORTED;
+                    op->result.code = -1;
+                    op->syserrno = EINTR;
+                    op->status = pt_continuation_done;
+                    return;
+                }
+
+                if (rv > 0) {
+                    PRInt16 revents = 0;
+
+                    if ((op->event & POLLIN) && FD_ISSET(op->arg1.osfd, &rd)) {
+                        revents |= POLLIN;
+                    }
+                    if ((op->event & POLLOUT) && FD_ISSET(op->arg1.osfd, &wr)) {
+                        revents |= POLLOUT;
+                    }
+
+                    if (op->function(op, revents)) {
+                        op->status = pt_continuation_done;
+                    }
+
+                } else if ((rv == 0) ||
+                           ((errno == EINTR) || (errno == EAGAIN))) {
+                    if (rv == 0) {  /* select timed out */
+                        if (wait_for_remaining) {
+                            now += remaining;
+                        }
+                        else {
+                            now += PR_MillisecondsToInterval(msecs);
+                        }
+                    } else {
+                        now = PR_IntervalNow();
+                    }
+                    elapsed = (PRIntervalTime) (now - epoch);
+                    if (elapsed >= op->timeout) {
+                        op->result.code = -1;
+                        op->syserrno = ETIMEDOUT;
+                        op->status = pt_continuation_done;
+                    } else {
+                        remaining = op->timeout - elapsed;
+                    }
+                } else {
+                    op->result.code = -1;
+                    op->syserrno = errno;
+                    op->status = pt_continuation_done;
+                }
+            } while (pt_continuation_done != op->status);
+            break;
+    }
+
+}  /* pt_poll_now_with_select */
+
+#endif  /* _PR_POLL_WITH_SELECT */
+
+static void pt_poll_now(pt_Continuation *op)
+{
+    PRInt32 msecs;
+    PRIntervalTime epoch, now, elapsed, remaining;
+    PRBool wait_for_remaining;
+    PRThread *self = PR_GetCurrentThread();
+
+    PR_ASSERT(PR_INTERVAL_NO_WAIT != op->timeout);
+#if defined (_PR_POLL_WITH_SELECT)
+    /*
+     * If the fd is small enough call the select-based poll operation
+     */
+    if (op->arg1.osfd < FD_SETSIZE) {
+        pt_poll_now_with_select(op);
+        return;
+    }
+#endif
+
+    switch (op->timeout) {
+        case PR_INTERVAL_NO_TIMEOUT:
+            msecs = PT_DEFAULT_POLL_MSEC;
+            do
+            {
+                PRIntn rv;
+                struct pollfd tmp_pfd;
+
+                tmp_pfd.revents = 0;
+                tmp_pfd.fd = op->arg1.osfd;
+                tmp_pfd.events = op->event;
+
+                rv = poll(&tmp_pfd, 1, msecs);
+
+                if (_PT_THREAD_INTERRUPTED(self))
+                {
+                    self->state &= ~PT_THREAD_ABORTED;
+                    op->result.code = -1;
+                    op->syserrno = EINTR;
+                    op->status = pt_continuation_done;
+                    return;
+                }
+
+                if ((-1 == rv) && ((errno == EINTR) || (errno == EAGAIN))) {
+                    continue;    /* go around the loop again */
+                }
+
+                if (rv > 0)
+                {
+                    PRInt16 events = tmp_pfd.events;
+                    PRInt16 revents = tmp_pfd.revents;
+
+                    if ((revents & POLLNVAL)  /* busted in all cases */
+                        || ((events & POLLOUT) && (revents & POLLHUP)))
+                        /* write op & hup */
+                    {
+                        op->result.code = -1;
+                        if (POLLNVAL & revents) {
+                            op->syserrno = EBADF;
+                        }
+                        else if (POLLHUP & revents) {
+                            op->syserrno = EPIPE;
+                        }
+                        op->status = pt_continuation_done;
+                    } else {
+                        if (op->function(op, revents)) {
+                            op->status = pt_continuation_done;
+                        }
+                    }
+                } else if (rv == -1) {
+                    op->result.code = -1;
+                    op->syserrno = errno;
+                    op->status = pt_continuation_done;
+                }
+                /* else, poll timed out */
+            } while (pt_continuation_done != op->status);
+            break;
+        default:
+            now = epoch = PR_IntervalNow();
+            remaining = op->timeout;
+            do
+            {
+                PRIntn rv;
+                struct pollfd tmp_pfd;
+
+                tmp_pfd.revents = 0;
+                tmp_pfd.fd = op->arg1.osfd;
+                tmp_pfd.events = op->event;
+
+                wait_for_remaining = PR_TRUE;
+                msecs = (PRInt32)PR_IntervalToMilliseconds(remaining);
+                if (msecs > PT_DEFAULT_POLL_MSEC)
+                {
+                    wait_for_remaining = PR_FALSE;
+                    msecs = PT_DEFAULT_POLL_MSEC;
+                }
+                rv = poll(&tmp_pfd, 1, msecs);
+
+                if (_PT_THREAD_INTERRUPTED(self))
+                {
+                    self->state &= ~PT_THREAD_ABORTED;
+                    op->result.code = -1;
+                    op->syserrno = EINTR;
+                    op->status = pt_continuation_done;
+                    return;
+                }
+
+                if (rv > 0)
+                {
+                    PRInt16 events = tmp_pfd.events;
+                    PRInt16 revents = tmp_pfd.revents;
+
+                    if ((revents & POLLNVAL)  /* busted in all cases */
+                        || ((events & POLLOUT) && (revents & POLLHUP)))
+                        /* write op & hup */
+                    {
+                        op->result.code = -1;
+                        if (POLLNVAL & revents) {
+                            op->syserrno = EBADF;
+                        }
+                        else if (POLLHUP & revents) {
+                            op->syserrno = EPIPE;
+                        }
+                        op->status = pt_continuation_done;
+                    } else {
+                        if (op->function(op, revents))
+                        {
+                            op->status = pt_continuation_done;
+                        }
+                    }
+                } else if ((rv == 0) ||
+                           ((errno == EINTR) || (errno == EAGAIN))) {
+                    if (rv == 0)    /* poll timed out */
+                    {
+                        if (wait_for_remaining) {
+                            now += remaining;
+                        }
+                        else {
+                            now += PR_MillisecondsToInterval(msecs);
+                        }
+                    }
+                    else {
+                        now = PR_IntervalNow();
+                    }
+                    elapsed = (PRIntervalTime) (now - epoch);
+                    if (elapsed >= op->timeout) {
+                        op->result.code = -1;
+                        op->syserrno = ETIMEDOUT;
+                        op->status = pt_continuation_done;
+                    } else {
+                        remaining = op->timeout - elapsed;
+                    }
+                } else {
+                    op->result.code = -1;
+                    op->syserrno = errno;
+                    op->status = pt_continuation_done;
+                }
+            } while (pt_continuation_done != op->status);
+            break;
+    }
+
+}  /* pt_poll_now */
+
+static PRIntn pt_Continue(pt_Continuation *op)
+{
+    op->status = pt_continuation_pending;  /* set default value */
+    /*
+     * let each thread call poll directly
+     */
+    pt_poll_now(op);
+    PR_ASSERT(pt_continuation_done == op->status);
+    return op->result.code;
+}  /* pt_Continue */
+
+/*****************************************************************************/
+/*********************** specific continuation functions *********************/
+/*****************************************************************************/
+static PRBool pt_connect_cont(pt_Continuation *op, PRInt16 revents)
+{
+    op->syserrno = _MD_unix_get_nonblocking_connect_error(op->arg1.osfd);
+    if (op->syserrno != 0) {
+        op->result.code = -1;
+    } else {
+        op->result.code = 0;
+    }
+    return PR_TRUE; /* this one is cooked */
+}  /* pt_connect_cont */
+
+static PRBool pt_accept_cont(pt_Continuation *op, PRInt16 revents)
+{
+    op->syserrno = 0;
+    op->result.code = accept(
+                          op->arg1.osfd, op->arg2.buffer, op->arg3.addr_len);
+    if (-1 == op->result.code)
+    {
+        op->syserrno = errno;
+        if (EWOULDBLOCK == errno || EAGAIN == errno || ECONNABORTED == errno) {
+            return PR_FALSE;    /* do nothing - this one ain't finished */
+        }
+    }
+    return PR_TRUE;
+}  /* pt_accept_cont */
+
+static PRBool pt_read_cont(pt_Continuation *op, PRInt16 revents)
+{
+    /*
+     * Any number of bytes will complete the operation. It need
+     * not (and probably will not) satisfy the request. The only
+     * error we continue is EWOULDBLOCK|EAGAIN.
+     */
+    op->result.code = read(
+                          op->arg1.osfd, op->arg2.buffer, op->arg3.amount);
+    op->syserrno = errno;
+    return ((-1 == op->result.code) &&
+            (EWOULDBLOCK == op->syserrno || EAGAIN == op->syserrno)) ?
+           PR_FALSE : PR_TRUE;
+}  /* pt_read_cont */
+
+static PRBool pt_recv_cont(pt_Continuation *op, PRInt16 revents)
+{
+    /*
+     * Any number of bytes will complete the operation. It need
+     * not (and probably will not) satisfy the request. The only
+     * error we continue is EWOULDBLOCK|EAGAIN.
+     */
+#if defined(SOLARIS)
+    if (0 == op->arg4.flags)
+        op->result.code = read(
+                              op->arg1.osfd, op->arg2.buffer, op->arg3.amount);
+    else
+        op->result.code = recv(
+                              op->arg1.osfd, op->arg2.buffer, op->arg3.amount, op->arg4.flags);
+#else
+    op->result.code = recv(
+                          op->arg1.osfd, op->arg2.buffer, op->arg3.amount, op->arg4.flags);
+#endif
+    op->syserrno = errno;
+    return ((-1 == op->result.code) &&
+            (EWOULDBLOCK == op->syserrno || EAGAIN == op->syserrno)) ?
+           PR_FALSE : PR_TRUE;
+}  /* pt_recv_cont */
+
+static PRBool pt_send_cont(pt_Continuation *op, PRInt16 revents)
+{
+    PRIntn bytes;
+#if defined(SOLARIS)
+    PRInt32 tmp_amount = op->arg3.amount;
+#endif
+    /*
+     * We want to write the entire amount out, no matter how many
+     * tries it takes. Keep advancing the buffer and the decrementing
+     * the amount until the amount goes away. Return the total bytes
+     * (which should be the original amount) when finished (or an
+     * error).
+     */
+#if defined(SOLARIS)
+retry:
+    bytes = write(op->arg1.osfd, op->arg2.buffer, tmp_amount);
+#else
+    bytes = send(
+                op->arg1.osfd, op->arg2.buffer, op->arg3.amount, op->arg4.flags);
+#endif
+    op->syserrno = errno;
+
+#if defined(SOLARIS)
+    /*
+     * The write system call has been reported to return the ERANGE error
+     * on occasion. Try to write in smaller chunks to workaround this bug.
+     */
+    if ((bytes == -1) && (op->syserrno == ERANGE))
+    {
+        if (tmp_amount > 1)
+        {
+            tmp_amount = tmp_amount/2;  /* half the bytes */
+            goto retry;
+        }
+    }
+#endif
+
+    if (bytes >= 0)  /* this is progress */
+    {
+        char *bp = (char*)op->arg2.buffer;
+        bp += bytes;  /* adjust the buffer pointer */
+        op->arg2.buffer = bp;
+        op->result.code += bytes;  /* accumulate the number sent */
+        op->arg3.amount -= bytes;  /* and reduce the required count */
+        return (0 == op->arg3.amount) ? PR_TRUE : PR_FALSE;
+    }
+    if ((EWOULDBLOCK != op->syserrno) && (EAGAIN != op->syserrno))
+    {
+        op->result.code = -1;
+        return PR_TRUE;
+    }
+    else {
+        return PR_FALSE;
+    }
+}  /* pt_send_cont */
+
+static PRBool pt_write_cont(pt_Continuation *op, PRInt16 revents)
+{
+    PRIntn bytes;
+    /*
+     * We want to write the entire amount out, no matter how many
+     * tries it takes. Keep advancing the buffer and the decrementing
+     * the amount until the amount goes away. Return the total bytes
+     * (which should be the original amount) when finished (or an
+     * error).
+     */
+    bytes = write(op->arg1.osfd, op->arg2.buffer, op->arg3.amount);
+    op->syserrno = errno;
+    if (bytes >= 0)  /* this is progress */
+    {
+        char *bp = (char*)op->arg2.buffer;
+        bp += bytes;  /* adjust the buffer pointer */
+        op->arg2.buffer = bp;
+        op->result.code += bytes;  /* accumulate the number sent */
+        op->arg3.amount -= bytes;  /* and reduce the required count */
+        return (0 == op->arg3.amount) ? PR_TRUE : PR_FALSE;
+    }
+    if ((EWOULDBLOCK != op->syserrno) && (EAGAIN != op->syserrno))
+    {
+        op->result.code = -1;
+        return PR_TRUE;
+    }
+    else {
+        return PR_FALSE;
+    }
+}  /* pt_write_cont */
+
+static PRBool pt_writev_cont(pt_Continuation *op, PRInt16 revents)
+{
+    PRIntn bytes;
+    struct iovec *iov = (struct iovec*)op->arg2.buffer;
+    /*
+     * Same rules as write, but continuing seems to be a bit more
+     * complicated. As the number of bytes sent grows, we have to
+     * redefine the vector we're pointing at. We might have to
+     * modify an individual vector parms or we might have to eliminate
+     * a pair altogether.
+     */
+    bytes = writev(op->arg1.osfd, iov, op->arg3.amount);
+    op->syserrno = errno;
+    if (bytes >= 0)  /* this is progress */
+    {
+        PRIntn iov_index;
+        op->result.code += bytes;  /* accumulate the number sent */
+        for (iov_index = 0; iov_index < op->arg3.amount; ++iov_index)
+        {
+            /* how much progress did we make in the i/o vector? */
+            if (bytes < iov[iov_index].iov_len)
+            {
+                /* this element's not done yet */
+                char **bp = (char**)&(iov[iov_index].iov_base);
+                iov[iov_index].iov_len -= bytes;  /* there's that much left */
+                *bp += bytes;  /* starting there */
+                break;  /* go off and do that */
+            }
+            bytes -= iov[iov_index].iov_len;  /* that element's consumed */
+        }
+        op->arg2.buffer = &iov[iov_index];  /* new start of array */
+        op->arg3.amount -= iov_index;  /* and array length */
+        return (0 == op->arg3.amount) ? PR_TRUE : PR_FALSE;
+    }
+    if ((EWOULDBLOCK != op->syserrno) && (EAGAIN != op->syserrno))
+    {
+        op->result.code = -1;
+        return PR_TRUE;
+    }
+    else {
+        return PR_FALSE;
+    }
+}  /* pt_writev_cont */
+
+static PRBool pt_sendto_cont(pt_Continuation *op, PRInt16 revents)
+{
+    PRIntn bytes = sendto(
+                       op->arg1.osfd, op->arg2.buffer, op->arg3.amount, op->arg4.flags,
+                       (struct sockaddr*)op->arg5.addr, PR_NETADDR_SIZE(op->arg5.addr));
+    op->syserrno = errno;
+    if (bytes >= 0)  /* this is progress */
+    {
+        char *bp = (char*)op->arg2.buffer;
+        bp += bytes;  /* adjust the buffer pointer */
+        op->arg2.buffer = bp;
+        op->result.code += bytes;  /* accumulate the number sent */
+        op->arg3.amount -= bytes;  /* and reduce the required count */
+        return (0 == op->arg3.amount) ? PR_TRUE : PR_FALSE;
+    }
+    if ((EWOULDBLOCK != op->syserrno) && (EAGAIN != op->syserrno))
+    {
+        op->result.code = -1;
+        return PR_TRUE;
+    }
+    else {
+        return PR_FALSE;
+    }
+}  /* pt_sendto_cont */
+
+static PRBool pt_recvfrom_cont(pt_Continuation *op, PRInt16 revents)
+{
+    pt_SockLen addr_len = sizeof(PRNetAddr);
+    op->result.code = recvfrom(
+                          op->arg1.osfd, op->arg2.buffer, op->arg3.amount,
+                          op->arg4.flags, (struct sockaddr*)op->arg5.addr, &addr_len);
+    op->syserrno = errno;
+    return ((-1 == op->result.code) &&
+            (EWOULDBLOCK == op->syserrno || EAGAIN == op->syserrno)) ?
+           PR_FALSE : PR_TRUE;
+}  /* pt_recvfrom_cont */
+
+#ifdef AIX
+static PRBool pt_aix_sendfile_cont(pt_Continuation *op, PRInt16 revents)
+{
+    struct sf_parms *sf_struct = (struct sf_parms *) op->arg2.buffer;
+    ssize_t rv;
+    unsigned long long saved_file_offset;
+    long long saved_file_bytes;
+
+    saved_file_offset = sf_struct->file_offset;
+    saved_file_bytes = sf_struct->file_bytes;
+    sf_struct->bytes_sent = 0;
+
+    if ((sf_struct->file_bytes > 0) && (sf_struct->file_size > 0))
+        PR_ASSERT((sf_struct->file_bytes + sf_struct->file_offset) <=
+                  sf_struct->file_size);
+    rv = AIX_SEND_FILE(&op->arg1.osfd, sf_struct, op->arg4.flags);
+    op->syserrno = errno;
+
+    if (rv != -1) {
+        op->result.code += sf_struct->bytes_sent;
+        /*
+         * A bug in AIX 4.3.2 prevents the 'file_bytes' field from
+         * being updated. So, 'file_bytes' is maintained by NSPR to
+         * avoid conflict when this bug is fixed in AIX, in the future.
+         */
+        if (saved_file_bytes != -1) {
+            saved_file_bytes -= (sf_struct->file_offset - saved_file_offset);
+        }
+        sf_struct->file_bytes = saved_file_bytes;
+    } else if (op->syserrno != EWOULDBLOCK && op->syserrno != EAGAIN) {
+        op->result.code = -1;
+    } else {
+        return PR_FALSE;
+    }
+
+    if (rv == 1) {    /* more data to send */
+        return PR_FALSE;
+    }
+
+    return PR_TRUE;
+}
+#endif  /* AIX */
+
+#ifdef HPUX11
+static PRBool pt_hpux_sendfile_cont(pt_Continuation *op, PRInt16 revents)
+{
+    struct iovec *hdtrl = (struct iovec *) op->arg2.buffer;
+    int count;
+
+    count = sendfile(op->arg1.osfd, op->filedesc, op->arg3.file_spec.offset,
+                     op->arg3.file_spec.nbytes, hdtrl, op->arg4.flags);
+    PR_ASSERT(count <= op->nbytes_to_send);
+    op->syserrno = errno;
+
+    if (count != -1) {
+        op->result.code += count;
+    } else if (op->syserrno != EWOULDBLOCK && op->syserrno != EAGAIN) {
+        op->result.code = -1;
+    } else {
+        return PR_FALSE;
+    }
+    if (count != -1 && count < op->nbytes_to_send) {
+        if (count < hdtrl[0].iov_len) {
+            /* header not sent */
+
+            hdtrl[0].iov_base = ((char *) hdtrl[0].iov_base) + count;
+            hdtrl[0].iov_len -= count;
+
+        } else if (count < (hdtrl[0].iov_len + op->arg3.file_spec.nbytes)) {
+            /* header sent, file not sent */
+            PRUint32 file_nbytes_sent = count - hdtrl[0].iov_len;
+
+            hdtrl[0].iov_base = NULL;
+            hdtrl[0].iov_len = 0;
+
+            op->arg3.file_spec.offset += file_nbytes_sent;
+            op->arg3.file_spec.nbytes -= file_nbytes_sent;
+        } else if (count < (hdtrl[0].iov_len + op->arg3.file_spec.nbytes +
+                            hdtrl[1].iov_len)) {
+            PRUint32 trailer_nbytes_sent = count - (hdtrl[0].iov_len +
+                                                    op->arg3.file_spec.nbytes);
+
+            /* header sent, file sent, trailer not sent */
+
+            hdtrl[0].iov_base = NULL;
+            hdtrl[0].iov_len = 0;
+            /*
+             * set file offset and len so that no more file data is
+             * sent
+             */
+            op->arg3.file_spec.offset = op->arg3.file_spec.st_size;
+            op->arg3.file_spec.nbytes = 0;
+
+            hdtrl[1].iov_base =((char *) hdtrl[1].iov_base)+ trailer_nbytes_sent;
+            hdtrl[1].iov_len -= trailer_nbytes_sent;
+        }
+        op->nbytes_to_send -= count;
+        return PR_FALSE;
+    }
+
+    return PR_TRUE;
+}
+#endif  /* HPUX11 */
+
+#ifdef SOLARIS
+static PRBool pt_solaris_sendfile_cont(pt_Continuation *op, PRInt16 revents)
+{
+    struct sendfilevec *vec = (struct sendfilevec *) op->arg2.buffer;
+    size_t xferred;
+    ssize_t count;
+
+    count = SOLARIS_SENDFILEV(op->arg1.osfd, vec, op->arg3.amount, &xferred);
+    op->syserrno = errno;
+    PR_ASSERT((count == -1) || (count == xferred));
+
+    if (count == -1) {
+        if (op->syserrno != EWOULDBLOCK && op->syserrno != EAGAIN
+            && op->syserrno != EINTR) {
+            op->result.code = -1;
+            return PR_TRUE;
+        }
+        count = xferred;
+    } else if (count == 0) {
+        /*
+         * We are now at EOF. The file was truncated. Solaris sendfile is
+         * supposed to return 0 and no error in this case, though some versions
+         * may return -1 and EINVAL .
+         */
+        op->result.code = -1;
+        op->syserrno = 0; /* will be treated as EOF */
+        return PR_TRUE;
+    }
+    PR_ASSERT(count <= op->nbytes_to_send);
+
+    op->result.code += count;
+    if (count < op->nbytes_to_send) {
+        op->nbytes_to_send -= count;
+
+        while (count >= vec->sfv_len) {
+            count -= vec->sfv_len;
+            vec++;
+            op->arg3.amount--;
+        }
+        PR_ASSERT(op->arg3.amount > 0);
+
+        vec->sfv_off += count;
+        vec->sfv_len -= count;
+        PR_ASSERT(vec->sfv_len > 0);
+        op->arg2.buffer = vec;
+
+        return PR_FALSE;
+    }
+
+    return PR_TRUE;
+}
+#endif  /* SOLARIS */
+
+#ifdef LINUX
+static PRBool pt_linux_sendfile_cont(pt_Continuation *op, PRInt16 revents)
+{
+    ssize_t rv;
+    off_t oldoffset;
+
+    oldoffset = op->offset;
+    rv = sendfile(op->arg1.osfd, op->in_fd, &op->offset, op->count);
+    op->syserrno = errno;
+
+    if (rv == -1) {
+        if (op->syserrno != EWOULDBLOCK && op->syserrno != EAGAIN) {
+            op->result.code = -1;
+            return PR_TRUE;
+        }
+        rv = 0;
+    }
+    PR_ASSERT(rv == op->offset - oldoffset);
+    op->result.code += rv;
+    if (rv < op->count) {
+        op->count -= rv;
+        return PR_FALSE;
+    }
+    return PR_TRUE;
+}
+#endif  /* LINUX */
+
+void _PR_InitIO(void)
+{
+#if defined(DEBUG)
+    memset(&pt_debug, 0, sizeof(PTDebug));
+    pt_debug.timeStarted = PR_Now();
+#endif
+
+    _pr_flock_lock = PR_NewLock();
+    PR_ASSERT(NULL != _pr_flock_lock);
+    _pr_flock_cv = PR_NewCondVar(_pr_flock_lock);
+    PR_ASSERT(NULL != _pr_flock_cv);
+    _pr_rename_lock = PR_NewLock();
+    PR_ASSERT(NULL != _pr_rename_lock);
+
+    _PR_InitFdCache();  /* do that */
+
+    _pr_stdin = pt_SetMethods(0, PR_DESC_FILE, PR_FALSE, PR_TRUE);
+    _pr_stdout = pt_SetMethods(1, PR_DESC_FILE, PR_FALSE, PR_TRUE);
+    _pr_stderr = pt_SetMethods(2, PR_DESC_FILE, PR_FALSE, PR_TRUE);
+    PR_ASSERT(_pr_stdin && _pr_stdout && _pr_stderr);
+
+#ifdef _PR_IPV6_V6ONLY_PROBE
+    /* In Mac OS X v10.3 Panther Beta the IPV6_V6ONLY socket option
+     * is turned on by default, contrary to what RFC 3493, Section
+     * 5.3 says.  So we have to turn it off.  Find out whether we
+     * are running on such a system.
+     */
+    {
+        int osfd;
+        osfd = socket(AF_INET6, SOCK_STREAM, 0);
+        if (osfd != -1) {
+            int on;
+            socklen_t optlen = sizeof(on);
+            if (getsockopt(osfd, IPPROTO_IPV6, IPV6_V6ONLY,
+                           &on, &optlen) == 0) {
+                _pr_ipv6_v6only_on_by_default = on;
+            }
+            close(osfd);
+        }
+    }
+#endif
+}  /* _PR_InitIO */
+
+void _PR_CleanupIO(void)
+{
+    _PR_Putfd(_pr_stdin);
+    _pr_stdin = NULL;
+    _PR_Putfd(_pr_stdout);
+    _pr_stdout = NULL;
+    _PR_Putfd(_pr_stderr);
+    _pr_stderr = NULL;
+
+    _PR_CleanupFdCache();
+
+    if (_pr_flock_cv)
+    {
+        PR_DestroyCondVar(_pr_flock_cv);
+        _pr_flock_cv = NULL;
+    }
+    if (_pr_flock_lock)
+    {
+        PR_DestroyLock(_pr_flock_lock);
+        _pr_flock_lock = NULL;
+    }
+    if (_pr_rename_lock)
+    {
+        PR_DestroyLock(_pr_rename_lock);
+        _pr_rename_lock = NULL;
+    }
+}  /* _PR_CleanupIO */
+
+PR_IMPLEMENT(PRFileDesc*) PR_GetSpecialFD(PRSpecialFD osfd)
+{
+    PRFileDesc *result = NULL;
+    PR_ASSERT(osfd >= PR_StandardInput && osfd <= PR_StandardError);
+
+    if (!_pr_initialized) {
+        _PR_ImplicitInitialization();
+    }
+
+    switch (osfd)
+    {
+        case PR_StandardInput: result = _pr_stdin; break;
+        case PR_StandardOutput: result = _pr_stdout; break;
+        case PR_StandardError: result = _pr_stderr; break;
+        default:
+            (void)PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+    }
+    return result;
+}  /* PR_GetSpecialFD */
+
+/*****************************************************************************/
+/***************************** I/O private methods ***************************/
+/*****************************************************************************/
+
+static PRBool pt_TestAbort(void)
+{
+    PRThread *me = PR_GetCurrentThread();
+    if(_PT_THREAD_INTERRUPTED(me))
+    {
+        PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+        me->state &= ~PT_THREAD_ABORTED;
+        return PR_TRUE;
+    }
+    return PR_FALSE;
+}  /* pt_TestAbort */
+
+static void pt_MapError(void (*mapper)(PRIntn), PRIntn syserrno)
+{
+    switch (syserrno)
+    {
+        case EINTR:
+            PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0); break;
+        case ETIMEDOUT:
+            PR_SetError(PR_IO_TIMEOUT_ERROR, 0); break;
+        default:
+            mapper(syserrno);
+    }
+}  /* pt_MapError */
+
+static PRStatus pt_Close(PRFileDesc *fd)
+{
+    if ((NULL == fd) || (NULL == fd->secret)
+        || ((_PR_FILEDESC_OPEN != fd->secret->state)
+            && (_PR_FILEDESC_CLOSED != fd->secret->state)))
+    {
+        PR_SetError(PR_BAD_DESCRIPTOR_ERROR, 0);
+        return PR_FAILURE;
+    }
+    if (pt_TestAbort()) {
+        return PR_FAILURE;
+    }
+
+    if (_PR_FILEDESC_OPEN == fd->secret->state)
+    {
+        if (-1 == close(fd->secret->md.osfd))
+        {
+            pt_MapError(_PR_MD_MAP_CLOSE_ERROR, errno);
+            return PR_FAILURE;
+        }
+        fd->secret->state = _PR_FILEDESC_CLOSED;
+    }
+    _PR_Putfd(fd);
+    return PR_SUCCESS;
+}  /* pt_Close */
+
+static PRInt32 pt_Read(PRFileDesc *fd, void *buf, PRInt32 amount)
+{
+    PRInt32 syserrno, bytes = -1;
+
+    if (pt_TestAbort()) {
+        return bytes;
+    }
+
+    bytes = read(fd->secret->md.osfd, buf, amount);
+    syserrno = errno;
+
+    if ((bytes == -1) && (syserrno == EWOULDBLOCK || syserrno == EAGAIN)
+        && (!fd->secret->nonblocking))
+    {
+        pt_Continuation op;
+        op.arg1.osfd = fd->secret->md.osfd;
+        op.arg2.buffer = buf;
+        op.arg3.amount = amount;
+        op.timeout = PR_INTERVAL_NO_TIMEOUT;
+        op.function = pt_read_cont;
+        op.event = POLLIN | POLLPRI;
+        bytes = pt_Continue(&op);
+        syserrno = op.syserrno;
+    }
+    if (bytes < 0) {
+        pt_MapError(_PR_MD_MAP_READ_ERROR, syserrno);
+    }
+    return bytes;
+}  /* pt_Read */
+
+static PRInt32 pt_Write(PRFileDesc *fd, const void *buf, PRInt32 amount)
+{
+    PRInt32 syserrno, bytes = -1;
+    PRBool fNeedContinue = PR_FALSE;
+
+    if (pt_TestAbort()) {
+        return bytes;
+    }
+
+    bytes = write(fd->secret->md.osfd, buf, amount);
+    syserrno = errno;
+
+    if ( (bytes >= 0) && (bytes < amount) && (!fd->secret->nonblocking) )
+    {
+        buf = (char *) buf + bytes;
+        amount -= bytes;
+        fNeedContinue = PR_TRUE;
+    }
+    if ( (bytes == -1) && (syserrno == EWOULDBLOCK || syserrno == EAGAIN)
+         && (!fd->secret->nonblocking) )
+    {
+        bytes = 0;
+        fNeedContinue = PR_TRUE;
+    }
+
+    if (fNeedContinue == PR_TRUE)
+    {
+        pt_Continuation op;
+        op.arg1.osfd = fd->secret->md.osfd;
+        op.arg2.buffer = (void*)buf;
+        op.arg3.amount = amount;
+        op.timeout = PR_INTERVAL_NO_TIMEOUT;
+        op.result.code = bytes;  /* initialize the number sent */
+        op.function = pt_write_cont;
+        op.event = POLLOUT | POLLPRI;
+        bytes = pt_Continue(&op);
+        syserrno = op.syserrno;
+    }
+    if (bytes == -1) {
+        pt_MapError(_PR_MD_MAP_WRITE_ERROR, syserrno);
+    }
+    return bytes;
+}  /* pt_Write */
+
+static PRInt32 pt_Writev(
+    PRFileDesc *fd, const PRIOVec *iov, PRInt32 iov_len, PRIntervalTime timeout)
+{
+    PRIntn iov_index;
+    PRBool fNeedContinue = PR_FALSE;
+    PRInt32 syserrno, bytes, rv = -1;
+    struct iovec osiov_local[PR_MAX_IOVECTOR_SIZE], *osiov;
+    int osiov_len;
+
+    if (pt_TestAbort()) {
+        return rv;
+    }
+
+    /* Ensured by PR_Writev */
+    PR_ASSERT(iov_len <= PR_MAX_IOVECTOR_SIZE);
+
+    /*
+     * We can't pass iov to writev because PRIOVec and struct iovec
+     * may not be binary compatible.  Make osiov a copy of iov and
+     * pass osiov to writev.  We can modify osiov if we need to
+     * continue the operation.
+     */
+    osiov = osiov_local;
+    osiov_len = iov_len;
+    for (iov_index = 0; iov_index < osiov_len; iov_index++)
+    {
+        osiov[iov_index].iov_base = iov[iov_index].iov_base;
+        osiov[iov_index].iov_len = iov[iov_index].iov_len;
+    }
+
+    rv = bytes = writev(fd->secret->md.osfd, osiov, osiov_len);
+    syserrno = errno;
+
+    if (!fd->secret->nonblocking)
+    {
+        if (bytes >= 0)
+        {
+            /*
+             * If we moved some bytes, how does that implicate the
+             * i/o vector list?  In other words, exactly where are
+             * we within that array?  What are the parameters for
+             * resumption?  Maybe we're done!
+             */
+            for ( ; osiov_len > 0; osiov++, osiov_len--)
+            {
+                if (bytes < osiov->iov_len)
+                {
+                    /* this one's not done yet */
+                    osiov->iov_base = (char*)osiov->iov_base + bytes;
+                    osiov->iov_len -= bytes;
+                    break;  /* go off and do that */
+                }
+                bytes -= osiov->iov_len;  /* this one's done cooked */
+            }
+            PR_ASSERT(osiov_len > 0 || bytes == 0);
+            if (osiov_len > 0)
+            {
+                if (PR_INTERVAL_NO_WAIT == timeout)
+                {
+                    rv = -1;
+                    syserrno = ETIMEDOUT;
+                }
+                else {
+                    fNeedContinue = PR_TRUE;
+                }
+            }
+        }
+        else if (syserrno == EWOULDBLOCK || syserrno == EAGAIN)
+        {
+            if (PR_INTERVAL_NO_WAIT == timeout) {
+                syserrno = ETIMEDOUT;
+            }
+            else
+            {
+                rv = 0;
+                fNeedContinue = PR_TRUE;
+            }
+        }
+    }
+
+    if (fNeedContinue == PR_TRUE)
+    {
+        pt_Continuation op;
+
+        op.arg1.osfd = fd->secret->md.osfd;
+        op.arg2.buffer = (void*)osiov;
+        op.arg3.amount = osiov_len;
+        op.timeout = timeout;
+        op.result.code = rv;
+        op.function = pt_writev_cont;
+        op.event = POLLOUT | POLLPRI;
+        rv = pt_Continue(&op);
+        syserrno = op.syserrno;
+    }
+    if (rv == -1) {
+        pt_MapError(_PR_MD_MAP_WRITEV_ERROR, syserrno);
+    }
+    return rv;
+}  /* pt_Writev */
+
+static PRInt32 pt_Seek(PRFileDesc *fd, PRInt32 offset, PRSeekWhence whence)
+{
+    return _PR_MD_LSEEK(fd, offset, whence);
+}  /* pt_Seek */
+
+static PRInt64 pt_Seek64(PRFileDesc *fd, PRInt64 offset, PRSeekWhence whence)
+{
+    return _PR_MD_LSEEK64(fd, offset, whence);
+}  /* pt_Seek64 */
+
+static PRInt32 pt_Available_f(PRFileDesc *fd)
+{
+    PRInt32 result, cur, end;
+
+    cur = _PR_MD_LSEEK(fd, 0, PR_SEEK_CUR);
+
+    if (cur >= 0) {
+        end = _PR_MD_LSEEK(fd, 0, PR_SEEK_END);
+    }
+
+    if ((cur < 0) || (end < 0)) {
+        return -1;
+    }
+
+    result = end - cur;
+    _PR_MD_LSEEK(fd, cur, PR_SEEK_SET);
+
+    return result;
+}  /* pt_Available_f */
+
+static PRInt64 pt_Available64_f(PRFileDesc *fd)
+{
+    PRInt64 result, cur, end;
+    PRInt64 minus_one;
+
+    LL_I2L(minus_one, -1);
+    cur = _PR_MD_LSEEK64(fd, LL_ZERO, PR_SEEK_CUR);
+
+    if (LL_GE_ZERO(cur)) {
+        end = _PR_MD_LSEEK64(fd, LL_ZERO, PR_SEEK_END);
+    }
+
+    if (!LL_GE_ZERO(cur) || !LL_GE_ZERO(end)) {
+        return minus_one;
+    }
+
+    LL_SUB(result, end, cur);
+    (void)_PR_MD_LSEEK64(fd, cur, PR_SEEK_SET);
+
+    return result;
+}  /* pt_Available64_f */
+
+static PRInt32 pt_Available_s(PRFileDesc *fd)
+{
+    PRInt32 rv, bytes = -1;
+    if (pt_TestAbort()) {
+        return bytes;
+    }
+
+    rv = ioctl(fd->secret->md.osfd, FIONREAD, &bytes);
+
+    if (rv == -1) {
+        pt_MapError(_PR_MD_MAP_SOCKETAVAILABLE_ERROR, errno);
+    }
+    return bytes;
+}  /* pt_Available_s */
+
+static PRInt64 pt_Available64_s(PRFileDesc *fd)
+{
+    PRInt64 rv;
+    LL_I2L(rv, pt_Available_s(fd));
+    return rv;
+}  /* pt_Available64_s */
+
+static PRStatus pt_FileInfo(PRFileDesc *fd, PRFileInfo *info)
+{
+    PRInt32 rv = _PR_MD_GETOPENFILEINFO(fd, info);
+    return (-1 == rv) ? PR_FAILURE : PR_SUCCESS;
+}  /* pt_FileInfo */
+
+static PRStatus pt_FileInfo64(PRFileDesc *fd, PRFileInfo64 *info)
+{
+    PRInt32 rv = _PR_MD_GETOPENFILEINFO64(fd, info);
+    return (-1 == rv) ? PR_FAILURE : PR_SUCCESS;
+}  /* pt_FileInfo64 */
+
+static PRStatus pt_Synch(PRFileDesc *fd)
+{
+    return (NULL == fd) ? PR_FAILURE : PR_SUCCESS;
+} /* pt_Synch */
+
+static PRStatus pt_Fsync(PRFileDesc *fd)
+{
+    PRIntn rv = -1;
+    if (pt_TestAbort()) {
+        return PR_FAILURE;
+    }
+
+    rv = fsync(fd->secret->md.osfd);
+    if (rv < 0) {
+        pt_MapError(_PR_MD_MAP_FSYNC_ERROR, errno);
+        return PR_FAILURE;
+    }
+    return PR_SUCCESS;
+}  /* pt_Fsync */
+
+static PRStatus pt_Connect(
+    PRFileDesc *fd, const PRNetAddr *addr, PRIntervalTime timeout)
+{
+    PRIntn rv = -1, syserrno;
+    pt_SockLen addr_len;
+    const PRNetAddr *addrp = addr;
+#if defined(_PR_HAVE_SOCKADDR_LEN) || defined(_PR_INET6)
+    PRNetAddr addrCopy;
+#endif
+#ifdef _PR_HAVE_SOCKADDR_LEN
+    PRUint16 md_af = addr->raw.family;
+#endif
+
+    if (pt_TestAbort()) {
+        return PR_FAILURE;
+    }
+
+    PR_ASSERT(IsValidNetAddr(addr) == PR_TRUE);
+    addr_len = PR_NETADDR_SIZE(addr);
+#ifdef _PR_INET6
+    if (addr->raw.family == PR_AF_INET6) {
+#ifdef _PR_HAVE_SOCKADDR_LEN
+        md_af = AF_INET6;
+#else
+        addrCopy = *addr;
+        addrCopy.raw.family = AF_INET6;
+        addrp = &addrCopy;
+#endif
+    }
+#endif
+
+#ifdef _PR_HAVE_SOCKADDR_LEN
+    addrCopy = *addr;
+    ((struct sockaddr*)&addrCopy)->sa_len = addr_len;
+    ((struct sockaddr*)&addrCopy)->sa_family = md_af;
+    addrp = &addrCopy;
+#endif
+    rv = connect(fd->secret->md.osfd, (struct sockaddr*)addrp, addr_len);
+    syserrno = errno;
+    if ((-1 == rv) && (EINPROGRESS == syserrno) && (!fd->secret->nonblocking))
+    {
+        if (PR_INTERVAL_NO_WAIT == timeout) {
+            syserrno = ETIMEDOUT;
+        }
+        else
+        {
+            pt_Continuation op;
+            op.arg1.osfd = fd->secret->md.osfd;
+            op.arg2.buffer = (void*)addrp;
+            op.arg3.amount = addr_len;
+            op.timeout = timeout;
+            op.function = pt_connect_cont;
+            op.event = POLLOUT | POLLPRI;
+            rv = pt_Continue(&op);
+            syserrno = op.syserrno;
+        }
+    }
+    if (-1 == rv) {
+        pt_MapError(_PR_MD_MAP_CONNECT_ERROR, syserrno);
+        return PR_FAILURE;
+    }
+    return PR_SUCCESS;
+}  /* pt_Connect */
+
+static PRStatus pt_ConnectContinue(
+    PRFileDesc *fd, PRInt16 out_flags)
+{
+    int err;
+    PRInt32 osfd;
+
+    if (out_flags & PR_POLL_NVAL)
+    {
+        PR_SetError(PR_BAD_DESCRIPTOR_ERROR, 0);
+        return PR_FAILURE;
+    }
+    if ((out_flags & (PR_POLL_WRITE | PR_POLL_EXCEPT | PR_POLL_ERR
+                      | PR_POLL_HUP)) == 0)
+    {
+        PR_ASSERT(out_flags == 0);
+        PR_SetError(PR_IN_PROGRESS_ERROR, 0);
+        return PR_FAILURE;
+    }
+
+    osfd = fd->secret->md.osfd;
+
+    err = _MD_unix_get_nonblocking_connect_error(osfd);
+    if (err != 0)
+    {
+        _PR_MD_MAP_CONNECT_ERROR(err);
+        return PR_FAILURE;
+    }
+    return PR_SUCCESS;
+}  /* pt_ConnectContinue */
+
+PR_IMPLEMENT(PRStatus) PR_GetConnectStatus(const PRPollDesc *pd)
+{
+    /* Find the NSPR layer and invoke its connectcontinue method */
+    PRFileDesc *bottom = PR_GetIdentitiesLayer(pd->fd, PR_NSPR_IO_LAYER);
+
+    if (NULL == bottom)
+    {
+        PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+        return PR_FAILURE;
+    }
+    return pt_ConnectContinue(bottom, pd->out_flags);
+}  /* PR_GetConnectStatus */
+
+static PRFileDesc* pt_Accept(
+    PRFileDesc *fd, PRNetAddr *addr, PRIntervalTime timeout)
+{
+    PRFileDesc *newfd = NULL;
+    PRIntn syserrno, osfd = -1;
+    pt_SockLen addr_len = sizeof(PRNetAddr);
+
+    if (pt_TestAbort()) {
+        return newfd;
+    }
+
+#ifdef _PR_STRICT_ADDR_LEN
+    if (addr)
+    {
+        /*
+         * Set addr->raw.family just so that we can use the
+         * PR_NETADDR_SIZE macro.
+         */
+        addr->raw.family = fd->secret->af;
+        addr_len = PR_NETADDR_SIZE(addr);
+    }
+#endif
+
+    osfd = accept(fd->secret->md.osfd, (struct sockaddr*)addr, &addr_len);
+    syserrno = errno;
+
+    if (osfd == -1)
+    {
+        if (fd->secret->nonblocking) {
+            goto failed;
+        }
+
+        if (EWOULDBLOCK != syserrno && EAGAIN != syserrno
+            && ECONNABORTED != syserrno) {
+            goto failed;
+        }
+        else
+        {
+            if (PR_INTERVAL_NO_WAIT == timeout) {
+                syserrno = ETIMEDOUT;
+            }
+            else
+            {
+                pt_Continuation op;
+                op.arg1.osfd = fd->secret->md.osfd;
+                op.arg2.buffer = addr;
+                op.arg3.addr_len = &addr_len;
+                op.timeout = timeout;
+                op.function = pt_accept_cont;
+                op.event = POLLIN | POLLPRI;
+                osfd = pt_Continue(&op);
+                syserrno = op.syserrno;
+            }
+            if (osfd < 0) {
+                goto failed;
+            }
+        }
+    }
+#ifdef _PR_HAVE_SOCKADDR_LEN
+    /* ignore the sa_len field of struct sockaddr */
+    if (addr)
+    {
+        addr->raw.family = ((struct sockaddr*)addr)->sa_family;
+    }
+#endif /* _PR_HAVE_SOCKADDR_LEN */
+#ifdef _PR_INET6
+    if (addr && (AF_INET6 == addr->raw.family)) {
+        addr->raw.family = PR_AF_INET6;
+    }
+#endif
+    newfd = pt_SetMethods(osfd, PR_DESC_SOCKET_TCP, PR_TRUE, PR_FALSE);
+    if (newfd == NULL) {
+        close(osfd);    /* $$$ whoops! this doesn't work $$$ */
+    }
+    else
+    {
+        PR_ASSERT(IsValidNetAddr(addr) == PR_TRUE);
+        PR_ASSERT(IsValidNetAddrLen(addr, addr_len) == PR_TRUE);
+#ifdef LINUX
+        /*
+         * On Linux, experiments showed that the accepted sockets
+         * inherit the TCP_NODELAY socket option of the listening
+         * socket.
+         */
+        newfd->secret->md.tcp_nodelay = fd->secret->md.tcp_nodelay;
+#endif
+    }
+    return newfd;
+
+failed:
+    pt_MapError(_PR_MD_MAP_ACCEPT_ERROR, syserrno);
+    return NULL;
+}  /* pt_Accept */
+
+static PRStatus pt_Bind(PRFileDesc *fd, const PRNetAddr *addr)
+{
+    PRIntn rv;
+    pt_SockLen addr_len;
+    const PRNetAddr *addrp = addr;
+#if defined(_PR_HAVE_SOCKADDR_LEN) || defined(_PR_INET6)
+    PRNetAddr addrCopy;
+#endif
+#ifdef _PR_HAVE_SOCKADDR_LEN
+    PRUint16 md_af = addr->raw.family;
+#endif
+
+    if (pt_TestAbort()) {
+        return PR_FAILURE;
+    }
+
+    PR_ASSERT(IsValidNetAddr(addr) == PR_TRUE);
+    if (addr->raw.family == AF_UNIX)
+    {
+        /* Disallow relative pathnames */
+        if (addr->local.path[0] != '/'
+#if defined(LINUX)
+            /* Linux has abstract socket address support */
+            && addr->local.path[0] != 0
+#endif
+           )
+        {
+            PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+            return PR_FAILURE;
+        }
+    }
+
+#ifdef _PR_INET6
+    if (addr->raw.family == PR_AF_INET6) {
+#ifdef _PR_HAVE_SOCKADDR_LEN
+        md_af = AF_INET6;
+#else
+        addrCopy = *addr;
+        addrCopy.raw.family = AF_INET6;
+        addrp = &addrCopy;
+#endif
+    }
+#endif
+
+    addr_len = PR_NETADDR_SIZE(addr);
+#ifdef _PR_HAVE_SOCKADDR_LEN
+    addrCopy = *addr;
+    ((struct sockaddr*)&addrCopy)->sa_len = addr_len;
+    ((struct sockaddr*)&addrCopy)->sa_family = md_af;
+    addrp = &addrCopy;
+#endif
+    rv = bind(fd->secret->md.osfd, (struct sockaddr*)addrp, addr_len);
+
+    if (rv == -1) {
+        pt_MapError(_PR_MD_MAP_BIND_ERROR, errno);
+        return PR_FAILURE;
+    }
+    return PR_SUCCESS;
+}  /* pt_Bind */
+
+static PRStatus pt_Listen(PRFileDesc *fd, PRIntn backlog)
+{
+    PRIntn rv;
+
+    if (pt_TestAbort()) {
+        return PR_FAILURE;
+    }
+
+    rv = listen(fd->secret->md.osfd, backlog);
+    if (rv == -1) {
+        pt_MapError(_PR_MD_MAP_LISTEN_ERROR, errno);
+        return PR_FAILURE;
+    }
+    return PR_SUCCESS;
+}  /* pt_Listen */
+
+static PRStatus pt_Shutdown(PRFileDesc *fd, PRIntn how)
+{
+    PRIntn rv = -1;
+    if (pt_TestAbort()) {
+        return PR_FAILURE;
+    }
+
+    rv = shutdown(fd->secret->md.osfd, how);
+
+    if (rv == -1) {
+        pt_MapError(_PR_MD_MAP_SHUTDOWN_ERROR, errno);
+        return PR_FAILURE;
+    }
+    return PR_SUCCESS;
+}  /* pt_Shutdown */
+
+static PRInt16 pt_Poll(PRFileDesc *fd, PRInt16 in_flags, PRInt16 *out_flags)
+{
+    *out_flags = 0;
+    return in_flags;
+}  /* pt_Poll */
+
+static PRInt32 pt_Recv(
+    PRFileDesc *fd, void *buf, PRInt32 amount,
+    PRIntn flags, PRIntervalTime timeout)
+{
+    PRInt32 syserrno, bytes = -1;
+    PRIntn osflags;
+
+    if (0 == flags) {
+        osflags = 0;
+    }
+    else if (PR_MSG_PEEK == flags)
+    {
+        osflags = MSG_PEEK;
+    }
+    else
+    {
+        PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+        return bytes;
+    }
+
+    if (pt_TestAbort()) {
+        return bytes;
+    }
+
+    /* recv() is a much slower call on pre-2.6 Solaris than read(). */
+#if defined(SOLARIS)
+    if (0 == osflags) {
+        bytes = read(fd->secret->md.osfd, buf, amount);
+    }
+    else {
+        bytes = recv(fd->secret->md.osfd, buf, amount, osflags);
+    }
+#else
+    bytes = recv(fd->secret->md.osfd, buf, amount, osflags);
+#endif
+    syserrno = errno;
+
+    if ((bytes == -1) && (syserrno == EWOULDBLOCK || syserrno == EAGAIN)
+        && (!fd->secret->nonblocking))
+    {
+        if (PR_INTERVAL_NO_WAIT == timeout) {
+            syserrno = ETIMEDOUT;
+        }
+        else
+        {
+            pt_Continuation op;
+            op.arg1.osfd = fd->secret->md.osfd;
+            op.arg2.buffer = buf;
+            op.arg3.amount = amount;
+            op.arg4.flags = osflags;
+            op.timeout = timeout;
+            op.function = pt_recv_cont;
+            op.event = POLLIN | POLLPRI;
+            bytes = pt_Continue(&op);
+            syserrno = op.syserrno;
+        }
+    }
+    if (bytes < 0) {
+        pt_MapError(_PR_MD_MAP_RECV_ERROR, syserrno);
+    }
+    return bytes;
+}  /* pt_Recv */
+
+static PRInt32 pt_SocketRead(PRFileDesc *fd, void *buf, PRInt32 amount)
+{
+    return pt_Recv(fd, buf, amount, 0, PR_INTERVAL_NO_TIMEOUT);
+}  /* pt_SocketRead */
+
+static PRInt32 pt_Send(
+    PRFileDesc *fd, const void *buf, PRInt32 amount,
+    PRIntn flags, PRIntervalTime timeout)
+{
+    PRInt32 syserrno, bytes = -1;
+    PRBool fNeedContinue = PR_FALSE;
+#if defined(SOLARIS)
+    PRInt32 tmp_amount = amount;
+#endif
+
+    if (pt_TestAbort()) {
+        return bytes;
+    }
+
+    /*
+     * On pre-2.6 Solaris, send() is much slower than write().
+     * On 2.6 and beyond, with in-kernel sockets, send() and
+     * write() are fairly equivalent in performance.
+     */
+#if defined(SOLARIS)
+    PR_ASSERT(0 == flags);
+retry:
+    bytes = write(fd->secret->md.osfd, buf, tmp_amount);
+#else
+    bytes = send(fd->secret->md.osfd, buf, amount, flags);
+#endif
+    syserrno = errno;
+
+#if defined(SOLARIS)
+    /*
+     * The write system call has been reported to return the ERANGE error
+     * on occasion. Try to write in smaller chunks to workaround this bug.
+     */
+    if ((bytes == -1) && (syserrno == ERANGE))
+    {
+        if (tmp_amount > 1)
+        {
+            tmp_amount = tmp_amount/2;  /* half the bytes */
+            goto retry;
+        }
+    }
+#endif
+
+    if ( (bytes >= 0) && (bytes < amount) && (!fd->secret->nonblocking) )
+    {
+        if (PR_INTERVAL_NO_WAIT == timeout)
+        {
+            bytes = -1;
+            syserrno = ETIMEDOUT;
+        }
+        else
+        {
+            buf = (char *) buf + bytes;
+            amount -= bytes;
+            fNeedContinue = PR_TRUE;
+        }
+    }
+    if ( (bytes == -1) && (syserrno == EWOULDBLOCK || syserrno == EAGAIN)
+         && (!fd->secret->nonblocking) )
+    {
+        if (PR_INTERVAL_NO_WAIT == timeout) {
+            syserrno = ETIMEDOUT;
+        }
+        else
+        {
+            bytes = 0;
+            fNeedContinue = PR_TRUE;
+        }
+    }
+
+    if (fNeedContinue == PR_TRUE)
+    {
+        pt_Continuation op;
+        op.arg1.osfd = fd->secret->md.osfd;
+        op.arg2.buffer = (void*)buf;
+        op.arg3.amount = amount;
+        op.arg4.flags = flags;
+        op.timeout = timeout;
+        op.result.code = bytes;  /* initialize the number sent */
+        op.function = pt_send_cont;
+        op.event = POLLOUT | POLLPRI;
+        bytes = pt_Continue(&op);
+        syserrno = op.syserrno;
+    }
+    if (bytes == -1) {
+        pt_MapError(_PR_MD_MAP_SEND_ERROR, syserrno);
+    }
+    return bytes;
+}  /* pt_Send */
+
+static PRInt32 pt_SocketWrite(PRFileDesc *fd, const void *buf, PRInt32 amount)
+{
+    return pt_Send(fd, buf, amount, 0, PR_INTERVAL_NO_TIMEOUT);
+}  /* pt_SocketWrite */
+
+static PRInt32 pt_SendTo(
+    PRFileDesc *fd, const void *buf,
+    PRInt32 amount, PRIntn flags, const PRNetAddr *addr,
+    PRIntervalTime timeout)
+{
+    PRInt32 syserrno, bytes = -1;
+    PRBool fNeedContinue = PR_FALSE;
+    pt_SockLen addr_len;
+    const PRNetAddr *addrp = addr;
+#if defined(_PR_HAVE_SOCKADDR_LEN) || defined(_PR_INET6)
+    PRNetAddr addrCopy;
+#endif
+#ifdef _PR_HAVE_SOCKADDR_LEN
+    PRUint16 md_af = addr->raw.family;
+#endif
+
+    if (pt_TestAbort()) {
+        return bytes;
+    }
+
+    PR_ASSERT(IsValidNetAddr(addr) == PR_TRUE);
+#ifdef _PR_INET6
+    if (addr->raw.family == PR_AF_INET6) {
+#ifdef _PR_HAVE_SOCKADDR_LEN
+        md_af = AF_INET6;
+#else
+        addrCopy = *addr;
+        addrCopy.raw.family = AF_INET6;
+        addrp = &addrCopy;
+#endif
+    }
+#endif
+
+    addr_len = PR_NETADDR_SIZE(addr);
+#ifdef _PR_HAVE_SOCKADDR_LEN
+    addrCopy = *addr;
+    ((struct sockaddr*)&addrCopy)->sa_len = addr_len;
+    ((struct sockaddr*)&addrCopy)->sa_family = md_af;
+    addrp = &addrCopy;
+#endif
+    bytes = sendto(
+                fd->secret->md.osfd, buf, amount, flags,
+                (struct sockaddr*)addrp, addr_len);
+    syserrno = errno;
+    if ( (bytes == -1) && (syserrno == EWOULDBLOCK || syserrno == EAGAIN)
+         && (!fd->secret->nonblocking) )
+    {
+        if (PR_INTERVAL_NO_WAIT == timeout) {
+            syserrno = ETIMEDOUT;
+        }
+        else {
+            fNeedContinue = PR_TRUE;
+        }
+    }
+    if (fNeedContinue == PR_TRUE)
+    {
+        pt_Continuation op;
+        op.arg1.osfd = fd->secret->md.osfd;
+        op.arg2.buffer = (void*)buf;
+        op.arg3.amount = amount;
+        op.arg4.flags = flags;
+        op.arg5.addr = (PRNetAddr*)addrp;
+        op.timeout = timeout;
+        op.result.code = 0;  /* initialize the number sent */
+        op.function = pt_sendto_cont;
+        op.event = POLLOUT | POLLPRI;
+        bytes = pt_Continue(&op);
+        syserrno = op.syserrno;
+    }
+    if (bytes < 0) {
+        pt_MapError(_PR_MD_MAP_SENDTO_ERROR, syserrno);
+    }
+    return bytes;
+}  /* pt_SendTo */
+
+#if defined(LINUX) || defined(DARWIN)
+/* Linux uses SendTo to send data during TCP Fast Open. OSX uses connectx, but
+ * we will make it imitate the Linux's interface. */
+static PRInt32 pt_TCP_SendTo(
+    PRFileDesc *fd, const void *buf,
+    PRInt32 amount, PRIntn flags, const PRNetAddr *addr,
+    PRIntervalTime timeout)
+{
+#if defined(LINUX) || HAS_CONNECTX
+    PRInt32 syserrno, bytes = -1;
+    PRBool fNeedContinue = PR_FALSE;
+    pt_SockLen addr_len;
+    const PRNetAddr *addrp = addr;
+#if defined(_PR_HAVE_SOCKADDR_LEN) || defined(_PR_INET6)
+    PRNetAddr addrCopy;
+#endif
+#ifdef _PR_HAVE_SOCKADDR_LEN
+    PRUint16 md_af = addr->raw.family;
+#endif
+
+    if (pt_TestAbort()) {
+        return bytes;
+    }
+
+    PR_ASSERT(IsValidNetAddr(addr) == PR_TRUE);
+    addr_len = PR_NETADDR_SIZE(addr);
+#if defined(_PR_INET6)
+    if (addr->raw.family == PR_AF_INET6) {
+#ifdef _PR_HAVE_SOCKADDR_LEN
+        md_af = AF_INET6;
+#else
+        /* If _PR_INET6 is defined and it is PR_AF_INET6 we set family
+         * to AF_INET6. */
+        addrCopy = *addr;
+        addrCopy.raw.family = AF_INET6;
+        addrp = &addrCopy;
+#endif
+    }
+#endif
+
+#ifdef _PR_HAVE_SOCKADDR_LEN
+    /* if _PR_HAVE_SOCKADDR_LEN is defined and it is PR_AF_INET6 we set family
+     * to AF_INET6 and we set address length. */
+    addrCopy = *addr;
+    ((struct sockaddr*)&addrCopy)->sa_len = addr_len;
+    ((struct sockaddr*)&addrCopy)->sa_family = md_af;
+    addrp = &addrCopy;
+#endif
+
+#ifndef HAS_CONNECTX
+    bytes = sendto(
+                fd->secret->md.osfd, buf, amount, MSG_FASTOPEN,
+                (struct sockaddr*)addrp, addr_len);
+#else
+    sa_endpoints_t endpoints;
+    endpoints.sae_srcif = 0;
+    endpoints.sae_srcaddr = NULL;
+    endpoints.sae_srcaddrlen = 0;
+    endpoints.sae_dstaddr = (struct sockaddr *)addrp;
+    endpoints.sae_dstaddrlen = addr_len;
+    struct iovec iov[1];
+    iov[0].iov_base = buf;
+    iov[0].iov_len = amount;
+    PRInt32 rv = connectx(fd->secret->md.osfd, &endpoints, SAE_ASSOCID_ANY,
+                          CONNECT_DATA_IDEMPOTENT, iov, 1, &bytes, NULL);
+#endif
+    syserrno = errno;
+    if ( (bytes == -1) && (syserrno == EWOULDBLOCK || syserrno == EAGAIN)
+         && (!fd->secret->nonblocking) ) {
+        if (PR_INTERVAL_NO_WAIT == timeout) {
+            syserrno = ETIMEDOUT;
+        }
+        else {
+            fNeedContinue = PR_TRUE;
+        }
+    }
+    if (fNeedContinue == PR_TRUE) {
+        pt_Continuation op;
+        op.arg1.osfd = fd->secret->md.osfd;
+        op.arg2.buffer = (void*)buf;
+        op.arg3.amount = amount;
+        op.arg4.flags = flags;
+        op.arg5.addr = (PRNetAddr*)addrp;
+        op.timeout = timeout;
+        op.result.code = 0;  /* initialize the number sent */
+        op.function = pt_sendto_cont;
+        op.event = POLLOUT | POLLPRI;
+        bytes = pt_Continue(&op);
+        syserrno = op.syserrno;
+    }
+    if (bytes < 0) {
+        pt_MapError(_PR_MD_MAP_SENDTO_ERROR, syserrno);
+    }
+    return bytes;
+#else /* !HAS_CONNECTX */
+    PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
+    return -1;
+#endif
+}  /* pt_TCP_SendTo */
+#endif /* LINUX || DARWIN */
+
+static PRInt32 pt_RecvFrom(PRFileDesc *fd, void *buf, PRInt32 amount,
+                           PRIntn flags, PRNetAddr *addr, PRIntervalTime timeout)
+{
+    PRBool fNeedContinue = PR_FALSE;
+    PRInt32 syserrno, bytes = -1;
+    pt_SockLen addr_len = sizeof(PRNetAddr);
+
+    if (pt_TestAbort()) {
+        return bytes;
+    }
+
+    bytes = recvfrom(
+                fd->secret->md.osfd, buf, amount, flags,
+                (struct sockaddr*)addr, &addr_len);
+    syserrno = errno;
+
+    if ( (bytes == -1) && (syserrno == EWOULDBLOCK || syserrno == EAGAIN)
+         && (!fd->secret->nonblocking) )
+    {
+        if (PR_INTERVAL_NO_WAIT == timeout) {
+            syserrno = ETIMEDOUT;
+        }
+        else {
+            fNeedContinue = PR_TRUE;
+        }
+    }
+
+    if (fNeedContinue == PR_TRUE)
+    {
+        pt_Continuation op;
+        op.arg1.osfd = fd->secret->md.osfd;
+        op.arg2.buffer = buf;
+        op.arg3.amount = amount;
+        op.arg4.flags = flags;
+        op.arg5.addr = addr;
+        op.timeout = timeout;
+        op.function = pt_recvfrom_cont;
+        op.event = POLLIN | POLLPRI;
+        bytes = pt_Continue(&op);
+        syserrno = op.syserrno;
+    }
+    if (bytes >= 0)
+    {
+#ifdef _PR_HAVE_SOCKADDR_LEN
+        /* ignore the sa_len field of struct sockaddr */
+        if (addr)
+        {
+            addr->raw.family = ((struct sockaddr*)addr)->sa_family;
+        }
+#endif /* _PR_HAVE_SOCKADDR_LEN */
+#ifdef _PR_INET6
+        if (addr && (AF_INET6 == addr->raw.family)) {
+            addr->raw.family = PR_AF_INET6;
+        }
+#endif
+    }
+    else {
+        pt_MapError(_PR_MD_MAP_RECVFROM_ERROR, syserrno);
+    }
+    return bytes;
+}  /* pt_RecvFrom */
+
+#ifdef AIX
+#ifndef HAVE_SEND_FILE
+static pthread_once_t pt_aix_sendfile_once_block = PTHREAD_ONCE_INIT;
+
+static void pt_aix_sendfile_init_routine(void)
+{
+    void *handle = dlopen(NULL, RTLD_NOW | RTLD_GLOBAL);
+    pt_aix_sendfile_fptr = (ssize_t (*)()) dlsym(handle, "send_file");
+    dlclose(handle);
+}
+
+/*
+ * pt_AIXDispatchSendFile
+ */
+static PRInt32 pt_AIXDispatchSendFile(PRFileDesc *sd, PRSendFileData *sfd,
+                                      PRTransmitFileFlags flags, PRIntervalTime timeout)
+{
+    int rv;
+
+    rv = pthread_once(&pt_aix_sendfile_once_block,
+                      pt_aix_sendfile_init_routine);
+    PR_ASSERT(0 == rv);
+    if (pt_aix_sendfile_fptr) {
+        return pt_AIXSendFile(sd, sfd, flags, timeout);
+    } else {
+        return PR_EmulateSendFile(sd, sfd, flags, timeout);
+    }
+}
+#endif /* !HAVE_SEND_FILE */
+
+
+/*
+ * pt_AIXSendFile
+ *
+ *    Send file sfd->fd across socket sd. If specified, header and trailer
+ *    buffers are sent before and after the file, respectively.
+ *
+ *    PR_TRANSMITFILE_CLOSE_SOCKET flag - close socket after sending file
+ *
+ *    return number of bytes sent or -1 on error
+ *
+ *      This implementation takes advantage of the send_file() system
+ *      call available in AIX 4.3.2.
+ */
+
+static PRInt32 pt_AIXSendFile(PRFileDesc *sd, PRSendFileData *sfd,
+                              PRTransmitFileFlags flags, PRIntervalTime timeout)
+{
+    struct sf_parms sf_struct;
+    uint_t send_flags;
+    ssize_t rv;
+    int syserrno;
+    PRInt32 count;
+    unsigned long long saved_file_offset;
+    long long saved_file_bytes;
+
+    sf_struct.header_data = (void *) sfd->header;  /* cast away the 'const' */
+    sf_struct.header_length = sfd->hlen;
+    sf_struct.file_descriptor = sfd->fd->secret->md.osfd;
+    sf_struct.file_size = 0;
+    sf_struct.file_offset = sfd->file_offset;
+    if (sfd->file_nbytes == 0) {
+        sf_struct.file_bytes = -1;
+    }
+    else {
+        sf_struct.file_bytes = sfd->file_nbytes;
+    }
+    sf_struct.trailer_data = (void *) sfd->trailer;
+    sf_struct.trailer_length = sfd->tlen;
+    sf_struct.bytes_sent = 0;
+
+    saved_file_offset = sf_struct.file_offset;
+    saved_file_bytes = sf_struct.file_bytes;
+
+    send_flags = 0;         /* flags processed at the end */
+
+    /* The first argument to send_file() is int*. */
+    PR_ASSERT(sizeof(int) == sizeof(sd->secret->md.osfd));
+    do {
+        rv = AIX_SEND_FILE(&sd->secret->md.osfd, &sf_struct, send_flags);
+    } while (rv == -1 && (syserrno = errno) == EINTR);
+
+    if (rv == -1) {
+        if (syserrno == EAGAIN || syserrno == EWOULDBLOCK) {
+            count = 0; /* Not a real error.  Need to continue. */
+        } else {
+            count = -1;
+        }
+    } else {
+        count = sf_struct.bytes_sent;
+        /*
+         * A bug in AIX 4.3.2 prevents the 'file_bytes' field from
+         * being updated. So, 'file_bytes' is maintained by NSPR to
+         * avoid conflict when this bug is fixed in AIX, in the future.
+         */
+        if (saved_file_bytes != -1) {
+            saved_file_bytes -= (sf_struct.file_offset - saved_file_offset);
+        }
+        sf_struct.file_bytes = saved_file_bytes;
+    }
+
+    if ((rv == 1) || ((rv == -1) && (count == 0))) {
+        pt_Continuation op;
+
+        op.arg1.osfd = sd->secret->md.osfd;
+        op.arg2.buffer = &sf_struct;
+        op.arg4.flags = send_flags;
+        op.result.code = count;
+        op.timeout = timeout;
+        op.function = pt_aix_sendfile_cont;
+        op.event = POLLOUT | POLLPRI;
+        count = pt_Continue(&op);
+        syserrno = op.syserrno;
+    }
+
+    if (count == -1) {
+        pt_MapError(_MD_aix_map_sendfile_error, syserrno);
+        return -1;
+    }
+    if (flags & PR_TRANSMITFILE_CLOSE_SOCKET) {
+        PR_Close(sd);
+    }
+    PR_ASSERT(count == (sfd->hlen + sfd->tlen +
+                        ((sfd->file_nbytes ==  0) ?
+                         sf_struct.file_size - sfd->file_offset :
+                         sfd->file_nbytes)));
+    return count;
+}
+#endif /* AIX */
+
+#ifdef HPUX11
+/*
+ * pt_HPUXSendFile
+ *
+ *    Send file sfd->fd across socket sd. If specified, header and trailer
+ *    buffers are sent before and after the file, respectively.
+ *
+ *    PR_TRANSMITFILE_CLOSE_SOCKET flag - close socket after sending file
+ *
+ *    return number of bytes sent or -1 on error
+ *
+ *      This implementation takes advantage of the sendfile() system
+ *      call available in HP-UX B.11.00.
+ */
+
+static PRInt32 pt_HPUXSendFile(PRFileDesc *sd, PRSendFileData *sfd,
+                               PRTransmitFileFlags flags, PRIntervalTime timeout)
+{
+    struct stat statbuf;
+    size_t nbytes_to_send, file_nbytes_to_send;
+    struct iovec hdtrl[2];  /* optional header and trailer buffers */
+    int send_flags;
+    PRInt32 count;
+    int syserrno;
+
+    if (sfd->file_nbytes == 0) {
+        /* Get file size */
+        if (fstat(sfd->fd->secret->md.osfd, &statbuf) == -1) {
+            _PR_MD_MAP_FSTAT_ERROR(errno);
+            return -1;
+        }
+        file_nbytes_to_send = statbuf.st_size - sfd->file_offset;
+    } else {
+        file_nbytes_to_send = sfd->file_nbytes;
+    }
+    nbytes_to_send = sfd->hlen + sfd->tlen + file_nbytes_to_send;
+
+    hdtrl[0].iov_base = (void *) sfd->header;  /* cast away the 'const' */
+    hdtrl[0].iov_len = sfd->hlen;
+    hdtrl[1].iov_base = (void *) sfd->trailer;
+    hdtrl[1].iov_len = sfd->tlen;
+    /*
+     * SF_DISCONNECT seems to close the socket even if sendfile()
+     * only does a partial send on a nonblocking socket.  This
+     * would prevent the subsequent sendfile() calls on that socket
+     * from working.  So we don't use the SD_DISCONNECT flag.
+     */
+    send_flags = 0;
+
+    do {
+        count = sendfile(sd->secret->md.osfd, sfd->fd->secret->md.osfd,
+                         sfd->file_offset, file_nbytes_to_send, hdtrl, send_flags);
+    } while (count == -1 && (syserrno = errno) == EINTR);
+
+    if (count == -1 && (syserrno == EAGAIN || syserrno == EWOULDBLOCK)) {
+        count = 0;
+    }
+    if (count != -1 && count < nbytes_to_send) {
+        pt_Continuation op;
+
+        if (count < sfd->hlen) {
+            /* header not sent */
+
+            hdtrl[0].iov_base = ((char *) sfd->header) + count;
+            hdtrl[0].iov_len = sfd->hlen - count;
+            op.arg3.file_spec.offset = sfd->file_offset;
+            op.arg3.file_spec.nbytes = file_nbytes_to_send;
+        } else if (count < (sfd->hlen + file_nbytes_to_send)) {
+            /* header sent, file not sent */
+
+            hdtrl[0].iov_base = NULL;
+            hdtrl[0].iov_len = 0;
+
+            op.arg3.file_spec.offset = sfd->file_offset + count - sfd->hlen;
+            op.arg3.file_spec.nbytes = file_nbytes_to_send - (count - sfd->hlen);
+        } else if (count < (sfd->hlen + file_nbytes_to_send + sfd->tlen)) {
+            PRUint32 trailer_nbytes_sent;
+
+            /* header sent, file sent, trailer not sent */
+
+            hdtrl[0].iov_base = NULL;
+            hdtrl[0].iov_len = 0;
+            /*
+             * set file offset and len so that no more file data is
+             * sent
+             */
+            op.arg3.file_spec.offset = statbuf.st_size;
+            op.arg3.file_spec.nbytes = 0;
+
+            trailer_nbytes_sent = count - sfd->hlen - file_nbytes_to_send;
+            hdtrl[1].iov_base = ((char *) sfd->trailer) + trailer_nbytes_sent;
+            hdtrl[1].iov_len = sfd->tlen - trailer_nbytes_sent;
+        }
+
+        op.arg1.osfd = sd->secret->md.osfd;
+        op.filedesc = sfd->fd->secret->md.osfd;
+        op.arg2.buffer = hdtrl;
+        op.arg3.file_spec.st_size = statbuf.st_size;
+        op.arg4.flags = send_flags;
+        op.nbytes_to_send = nbytes_to_send - count;
+        op.result.code = count;
+        op.timeout = timeout;
+        op.function = pt_hpux_sendfile_cont;
+        op.event = POLLOUT | POLLPRI;
+        count = pt_Continue(&op);
+        syserrno = op.syserrno;
+    }
+
+    if (count == -1) {
+        pt_MapError(_MD_hpux_map_sendfile_error, syserrno);
+        return -1;
+    }
+    if (flags & PR_TRANSMITFILE_CLOSE_SOCKET) {
+        PR_Close(sd);
+    }
+    PR_ASSERT(count == nbytes_to_send);
+    return count;
+}
+
+#endif  /* HPUX11 */
+
+#ifdef SOLARIS
+
+/*
+ *    pt_SolarisSendFile
+ *
+ *    Send file sfd->fd across socket sd. If specified, header and trailer
+ *    buffers are sent before and after the file, respectively.
+ *
+ *    PR_TRANSMITFILE_CLOSE_SOCKET flag - close socket after sending file
+ *
+ *    return number of bytes sent or -1 on error
+ *
+ *    This implementation takes advantage of the sendfilev() system
+ *    call available in Solaris 8.
+ */
+
+static PRInt32 pt_SolarisSendFile(PRFileDesc *sd, PRSendFileData *sfd,
+                                  PRTransmitFileFlags flags, PRIntervalTime timeout)
+{
+    struct stat statbuf;
+    size_t nbytes_to_send, file_nbytes_to_send;
+    struct sendfilevec sfv_struct[3];
+    int sfvcnt = 0;
+    size_t xferred;
+    PRInt32 count;
+    int syserrno;
+
+    if (sfd->file_nbytes == 0) {
+        /* Get file size */
+        if (fstat(sfd->fd->secret->md.osfd, &statbuf) == -1) {
+            _PR_MD_MAP_FSTAT_ERROR(errno);
+            return -1;
+        }
+        file_nbytes_to_send = statbuf.st_size - sfd->file_offset;
+    } else {
+        file_nbytes_to_send = sfd->file_nbytes;
+    }
+
+    nbytes_to_send = sfd->hlen + sfd->tlen + file_nbytes_to_send;
+
+    if (sfd->hlen != 0) {
+        sfv_struct[sfvcnt].sfv_fd = SFV_FD_SELF;
+        sfv_struct[sfvcnt].sfv_flag = 0;
+        sfv_struct[sfvcnt].sfv_off = (off_t) sfd->header;
+        sfv_struct[sfvcnt].sfv_len = sfd->hlen;
+        sfvcnt++;
+    }
+
+    if (file_nbytes_to_send != 0) {
+        sfv_struct[sfvcnt].sfv_fd = sfd->fd->secret->md.osfd;
+        sfv_struct[sfvcnt].sfv_flag = 0;
+        sfv_struct[sfvcnt].sfv_off = sfd->file_offset;
+        sfv_struct[sfvcnt].sfv_len = file_nbytes_to_send;
+        sfvcnt++;
+    }
+
+    if (sfd->tlen != 0) {
+        sfv_struct[sfvcnt].sfv_fd = SFV_FD_SELF;
+        sfv_struct[sfvcnt].sfv_flag = 0;
+        sfv_struct[sfvcnt].sfv_off = (off_t) sfd->trailer;
+        sfv_struct[sfvcnt].sfv_len = sfd->tlen;
+        sfvcnt++;
+    }
+
+    if (0 == sfvcnt) {
+        count = 0;
+        goto done;
+    }
+
+    /*
+     * Strictly speaking, we may have sent some bytes when the
+     * sendfilev() is interrupted and we should retry it from an
+     * updated offset.  We are not doing that here.
+     */
+    count = SOLARIS_SENDFILEV(sd->secret->md.osfd, sfv_struct,
+                              sfvcnt, &xferred);
+
+    PR_ASSERT((count == -1) || (count == xferred));
+
+    if (count == -1) {
+        syserrno = errno;
+        if (syserrno == EINTR
+            || syserrno == EAGAIN || syserrno == EWOULDBLOCK) {
+            count = xferred;
+        }
+    } else if (count == 0) {
+        /*
+         * We are now at EOF. The file was truncated. Solaris sendfile is
+         * supposed to return 0 and no error in this case, though some versions
+         * may return -1 and EINVAL .
+         */
+        count = -1;
+        syserrno = 0;  /* will be treated as EOF */
+    }
+
+    if (count != -1 && count < nbytes_to_send) {
+        pt_Continuation op;
+        struct sendfilevec *vec = sfv_struct;
+        PRInt32 rem = count;
+
+        while (rem >= vec->sfv_len) {
+            rem -= vec->sfv_len;
+            vec++;
+            sfvcnt--;
+        }
+        PR_ASSERT(sfvcnt > 0);
+
+        vec->sfv_off += rem;
+        vec->sfv_len -= rem;
+        PR_ASSERT(vec->sfv_len > 0);
+
+        op.arg1.osfd = sd->secret->md.osfd;
+        op.arg2.buffer = vec;
+        op.arg3.amount = sfvcnt;
+        op.arg4.flags = 0;
+        op.nbytes_to_send = nbytes_to_send - count;
+        op.result.code = count;
+        op.timeout = timeout;
+        op.function = pt_solaris_sendfile_cont;
+        op.event = POLLOUT | POLLPRI;
+        count = pt_Continue(&op);
+        syserrno = op.syserrno;
+    }
+
+done:
+    if (count == -1) {
+        pt_MapError(_MD_solaris_map_sendfile_error, syserrno);
+        return -1;
+    }
+    if (flags & PR_TRANSMITFILE_CLOSE_SOCKET) {
+        PR_Close(sd);
+    }
+    PR_ASSERT(count == nbytes_to_send);
+    return count;
+}
+
+#ifndef HAVE_SENDFILEV
+static pthread_once_t pt_solaris_sendfilev_once_block = PTHREAD_ONCE_INIT;
+
+static void pt_solaris_sendfilev_init_routine(void)
+{
+    void *handle;
+    PRBool close_it = PR_FALSE;
+
+    /*
+     * We do not want to unload libsendfile.so.  This handle is leaked
+     * intentionally.
+     */
+    handle = dlopen("libsendfile.so", RTLD_LAZY | RTLD_GLOBAL);
+    PR_LOG(_pr_io_lm, PR_LOG_DEBUG,
+           ("dlopen(libsendfile.so) returns %p", handle));
+
+    if (NULL == handle) {
+        /*
+         * The dlopen(0, mode) call is to allow for the possibility that
+         * sendfilev() may become part of a standard system library in a
+         * future Solaris release.
+         */
+        handle = dlopen(0, RTLD_LAZY | RTLD_GLOBAL);
+        PR_LOG(_pr_io_lm, PR_LOG_DEBUG,
+               ("dlopen(0) returns %p", handle));
+        close_it = PR_TRUE;
+    }
+    pt_solaris_sendfilev_fptr = (ssize_t (*)()) dlsym(handle, "sendfilev");
+    PR_LOG(_pr_io_lm, PR_LOG_DEBUG,
+           ("dlsym(sendfilev) returns %p", pt_solaris_sendfilev_fptr));
+
+    if (close_it) {
+        dlclose(handle);
+    }
+}
+
+/*
+ * pt_SolarisDispatchSendFile
+ */
+static PRInt32 pt_SolarisDispatchSendFile(PRFileDesc *sd, PRSendFileData *sfd,
+        PRTransmitFileFlags flags, PRIntervalTime timeout)
+{
+    int rv;
+
+    rv = pthread_once(&pt_solaris_sendfilev_once_block,
+                      pt_solaris_sendfilev_init_routine);
+    PR_ASSERT(0 == rv);
+    if (pt_solaris_sendfilev_fptr) {
+        return pt_SolarisSendFile(sd, sfd, flags, timeout);
+    } else {
+        return PR_EmulateSendFile(sd, sfd, flags, timeout);
+    }
+}
+#endif /* !HAVE_SENDFILEV */
+
+#endif  /* SOLARIS */
+
+#ifdef LINUX
+/*
+ * pt_LinuxSendFile
+ *
+ *    Send file sfd->fd across socket sd. If specified, header and trailer
+ *    buffers are sent before and after the file, respectively.
+ *
+ *    PR_TRANSMITFILE_CLOSE_SOCKET flag - close socket after sending file
+ *
+ *    return number of bytes sent or -1 on error
+ *
+ *      This implementation takes advantage of the sendfile() system
+ *      call available in Linux kernel 2.2 or higher.
+ */
+
+static PRInt32 pt_LinuxSendFile(PRFileDesc *sd, PRSendFileData *sfd,
+                                PRTransmitFileFlags flags, PRIntervalTime timeout)
+{
+    struct stat statbuf;
+    size_t file_nbytes_to_send;
+    PRInt32 count = 0;
+    ssize_t rv;
+    int syserrno;
+    off_t offset;
+    PRBool tcp_cork_enabled = PR_FALSE;
+    int tcp_cork;
+
+    if (sfd->file_nbytes == 0) {
+        /* Get file size */
+        if (fstat(sfd->fd->secret->md.osfd, &statbuf) == -1) {
+            _PR_MD_MAP_FSTAT_ERROR(errno);
+            return -1;
+        }
+        file_nbytes_to_send = statbuf.st_size - sfd->file_offset;
+    } else {
+        file_nbytes_to_send = sfd->file_nbytes;
+    }
+
+    if ((sfd->hlen != 0 || sfd->tlen != 0)
+        && sd->secret->md.tcp_nodelay == 0) {
+        tcp_cork = 1;
+        if (setsockopt(sd->secret->md.osfd, SOL_TCP, TCP_CORK,
+                       &tcp_cork, sizeof tcp_cork) == 0) {
+            tcp_cork_enabled = PR_TRUE;
+        } else {
+            syserrno = errno;
+            if (syserrno != EINVAL) {
+                _PR_MD_MAP_SETSOCKOPT_ERROR(syserrno);
+                return -1;
+            }
+            /*
+             * The most likely reason for the EINVAL error is that
+             * TCP_NODELAY is set (with a function other than
+             * PR_SetSocketOption).  This is not fatal, so we keep
+             * on going.
+             */
+            PR_LOG(_pr_io_lm, PR_LOG_WARNING,
+                   ("pt_LinuxSendFile: "
+                    "setsockopt(TCP_CORK) failed with EINVAL\n"));
+        }
+    }
+
+    if (sfd->hlen != 0) {
+        count = PR_Send(sd, sfd->header, sfd->hlen, 0, timeout);
+        if (count == -1) {
+            goto failed;
+        }
+    }
+
+    if (file_nbytes_to_send != 0) {
+        offset = sfd->file_offset;
+        do {
+            rv = sendfile(sd->secret->md.osfd, sfd->fd->secret->md.osfd,
+                          &offset, file_nbytes_to_send);
+        } while (rv == -1 && (syserrno = errno) == EINTR);
+        if (rv == -1) {
+            if (syserrno != EAGAIN && syserrno != EWOULDBLOCK) {
+                _MD_linux_map_sendfile_error(syserrno);
+                count = -1;
+                goto failed;
+            }
+            rv = 0;
+        }
+        PR_ASSERT(rv == offset - sfd->file_offset);
+        count += rv;
+
+        if (rv < file_nbytes_to_send) {
+            pt_Continuation op;
+
+            op.arg1.osfd = sd->secret->md.osfd;
+            op.in_fd = sfd->fd->secret->md.osfd;
+            op.offset = offset;
+            op.count = file_nbytes_to_send - rv;
+            op.result.code = count;
+            op.timeout = timeout;
+            op.function = pt_linux_sendfile_cont;
+            op.event = POLLOUT | POLLPRI;
+            count = pt_Continue(&op);
+            syserrno = op.syserrno;
+            if (count == -1) {
+                pt_MapError(_MD_linux_map_sendfile_error, syserrno);
+                goto failed;
+            }
+        }
+    }
+
+    if (sfd->tlen != 0) {
+        rv = PR_Send(sd, sfd->trailer, sfd->tlen, 0, timeout);
+        if (rv == -1) {
+            count = -1;
+            goto failed;
+        }
+        count += rv;
+    }
+
+failed:
+    if (tcp_cork_enabled) {
+        tcp_cork = 0;
+        if (setsockopt(sd->secret->md.osfd, SOL_TCP, TCP_CORK,
+                       &tcp_cork, sizeof tcp_cork) == -1 && count != -1) {
+            _PR_MD_MAP_SETSOCKOPT_ERROR(errno);
+            count = -1;
+        }
+    }
+    if (count != -1) {
+        if (flags & PR_TRANSMITFILE_CLOSE_SOCKET) {
+            PR_Close(sd);
+        }
+        PR_ASSERT(count == sfd->hlen + sfd->tlen + file_nbytes_to_send);
+    }
+    return count;
+}
+#endif  /* LINUX */
+
+#ifdef AIX
+extern  int _pr_aix_send_file_use_disabled;
+#endif
+
+static PRInt32 pt_SendFile(
+    PRFileDesc *sd, PRSendFileData *sfd,
+    PRTransmitFileFlags flags, PRIntervalTime timeout)
+{
+    if (pt_TestAbort()) {
+        return -1;
+    }
+    /* The socket must be in blocking mode. */
+    if (sd->secret->nonblocking)
+    {
+        PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+        return -1;
+    }
+#ifdef HPUX11
+    return(pt_HPUXSendFile(sd, sfd, flags, timeout));
+#elif defined(AIX)
+#ifdef HAVE_SEND_FILE
+    /*
+     * A bug in AIX 4.3.2 results in corruption of data transferred by
+     * send_file(); AIX patch PTF U463956 contains the fix.  A user can
+     * disable the use of send_file function in NSPR, when this patch is
+     * not installed on the system, by setting the envionment variable
+     * NSPR_AIX_SEND_FILE_USE_DISABLED to 1.
+     */
+    if (_pr_aix_send_file_use_disabled) {
+        return(PR_EmulateSendFile(sd, sfd, flags, timeout));
+    }
+    else {
+        return(pt_AIXSendFile(sd, sfd, flags, timeout));
+    }
+#else
+    return(PR_EmulateSendFile(sd, sfd, flags, timeout));
+    /* return(pt_AIXDispatchSendFile(sd, sfd, flags, timeout));*/
+#endif /* HAVE_SEND_FILE */
+#elif defined(SOLARIS)
+#ifdef HAVE_SENDFILEV
+    return(pt_SolarisSendFile(sd, sfd, flags, timeout));
+#else
+    return(pt_SolarisDispatchSendFile(sd, sfd, flags, timeout));
+#endif /* HAVE_SENDFILEV */
+#elif defined(LINUX)
+    return(pt_LinuxSendFile(sd, sfd, flags, timeout));
+#else
+    return(PR_EmulateSendFile(sd, sfd, flags, timeout));
+#endif
+}
+
+static PRInt32 pt_TransmitFile(
+    PRFileDesc *sd, PRFileDesc *fd, const void *headers,
+    PRInt32 hlen, PRTransmitFileFlags flags, PRIntervalTime timeout)
+{
+    PRSendFileData sfd;
+
+    sfd.fd = fd;
+    sfd.file_offset = 0;
+    sfd.file_nbytes = 0;
+    sfd.header = headers;
+    sfd.hlen = hlen;
+    sfd.trailer = NULL;
+    sfd.tlen = 0;
+
+    return(pt_SendFile(sd, &sfd, flags, timeout));
+}  /* pt_TransmitFile */
+
+static PRInt32 pt_AcceptRead(
+    PRFileDesc *sd, PRFileDesc **nd, PRNetAddr **raddr,
+    void *buf, PRInt32 amount, PRIntervalTime timeout)
+{
+    PRInt32 rv = -1;
+
+    if (pt_TestAbort()) {
+        return rv;
+    }
+    /* The socket must be in blocking mode. */
+    if (sd->secret->nonblocking)
+    {
+        PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+        return rv;
+    }
+
+    rv = PR_EmulateAcceptRead(sd, nd, raddr, buf, amount, timeout);
+    return rv;
+}  /* pt_AcceptRead */
+
+static PRStatus pt_GetSockName(PRFileDesc *fd, PRNetAddr *addr)
+{
+    PRIntn rv = -1;
+    pt_SockLen addr_len = sizeof(PRNetAddr);
+
+    if (pt_TestAbort()) {
+        return PR_FAILURE;
+    }
+
+    rv = getsockname(
+             fd->secret->md.osfd, (struct sockaddr*)addr, &addr_len);
+    if (rv == -1) {
+        pt_MapError(_PR_MD_MAP_GETSOCKNAME_ERROR, errno);
+        return PR_FAILURE;
+    }
+#ifdef _PR_HAVE_SOCKADDR_LEN
+    /* ignore the sa_len field of struct sockaddr */
+    if (addr)
+    {
+        addr->raw.family = ((struct sockaddr*)addr)->sa_family;
+    }
+#endif /* _PR_HAVE_SOCKADDR_LEN */
+#ifdef _PR_INET6
+    if (AF_INET6 == addr->raw.family) {
+        addr->raw.family = PR_AF_INET6;
+    }
+#endif
+    PR_ASSERT(IsValidNetAddr(addr) == PR_TRUE);
+    PR_ASSERT(IsValidNetAddrLen(addr, addr_len) == PR_TRUE);
+    return PR_SUCCESS;
+}  /* pt_GetSockName */
+
+static PRStatus pt_GetPeerName(PRFileDesc *fd, PRNetAddr *addr)
+{
+    PRIntn rv = -1;
+    pt_SockLen addr_len = sizeof(PRNetAddr);
+
+    if (pt_TestAbort()) {
+        return PR_FAILURE;
+    }
+
+    rv = getpeername(
+             fd->secret->md.osfd, (struct sockaddr*)addr, &addr_len);
+
+    if (rv == -1) {
+        pt_MapError(_PR_MD_MAP_GETPEERNAME_ERROR, errno);
+        return PR_FAILURE;
+    }
+#ifdef _PR_HAVE_SOCKADDR_LEN
+    /* ignore the sa_len field of struct sockaddr */
+    if (addr)
+    {
+        addr->raw.family = ((struct sockaddr*)addr)->sa_family;
+    }
+#endif /* _PR_HAVE_SOCKADDR_LEN */
+#ifdef _PR_INET6
+    if (AF_INET6 == addr->raw.family) {
+        addr->raw.family = PR_AF_INET6;
+    }
+#endif
+    PR_ASSERT(IsValidNetAddr(addr) == PR_TRUE);
+    PR_ASSERT(IsValidNetAddrLen(addr, addr_len) == PR_TRUE);
+    return PR_SUCCESS;
+}  /* pt_GetPeerName */
+
+static PRStatus pt_GetSocketOption(PRFileDesc *fd, PRSocketOptionData *data)
+{
+    PRIntn rv;
+    pt_SockLen length;
+    PRInt32 level, name;
+
+    /*
+     * PR_SockOpt_Nonblocking is a special case that does not
+     * translate to a getsockopt() call
+     */
+    if (PR_SockOpt_Nonblocking == data->option)
+    {
+        data->value.non_blocking = fd->secret->nonblocking;
+        return PR_SUCCESS;
+    }
+
+    rv = _PR_MapOptionName(data->option, &level, &name);
+    if (PR_SUCCESS == rv)
+    {
+        switch (data->option)
+        {
+            case PR_SockOpt_Linger:
+            {
+                struct linger linger;
+                length = sizeof(linger);
+                rv = getsockopt(
+                         fd->secret->md.osfd, level, name, (char *) &linger, &length);
+                PR_ASSERT((-1 == rv) || (sizeof(linger) == length));
+                data->value.linger.polarity =
+                    (linger.l_onoff) ? PR_TRUE : PR_FALSE;
+                data->value.linger.linger =
+                    PR_SecondsToInterval(linger.l_linger);
+                break;
+            }
+            case PR_SockOpt_Reuseaddr:
+            case PR_SockOpt_Keepalive:
+            case PR_SockOpt_NoDelay:
+            case PR_SockOpt_Broadcast:
+            case PR_SockOpt_Reuseport:
+            {
+                PRIntn value;
+                length = sizeof(PRIntn);
+                rv = getsockopt(
+                         fd->secret->md.osfd, level, name, (char*)&value, &length);
+                PR_ASSERT((-1 == rv) || (sizeof(PRIntn) == length));
+                data->value.reuse_addr = (0 == value) ? PR_FALSE : PR_TRUE;
+                break;
+            }
+            case PR_SockOpt_McastLoopback:
+            {
+                PRUint8 xbool;
+                length = sizeof(xbool);
+                rv = getsockopt(
+                         fd->secret->md.osfd, level, name,
+                         (char*)&xbool, &length);
+                PR_ASSERT((-1 == rv) || (sizeof(xbool) == length));
+                data->value.mcast_loopback = (0 == xbool) ? PR_FALSE : PR_TRUE;
+                break;
+            }
+            case PR_SockOpt_RecvBufferSize:
+            case PR_SockOpt_SendBufferSize:
+            case PR_SockOpt_MaxSegment:
+            {
+                PRIntn value;
+                length = sizeof(PRIntn);
+                rv = getsockopt(
+                         fd->secret->md.osfd, level, name, (char*)&value, &length);
+                PR_ASSERT((-1 == rv) || (sizeof(PRIntn) == length));
+                data->value.recv_buffer_size = value;
+                break;
+            }
+            case PR_SockOpt_IpTimeToLive:
+            case PR_SockOpt_IpTypeOfService:
+            {
+                length = sizeof(PRUintn);
+                rv = getsockopt(
+                         fd->secret->md.osfd, level, name,
+                         (char*)&data->value.ip_ttl, &length);
+                PR_ASSERT((-1 == rv) || (sizeof(PRIntn) == length));
+                break;
+            }
+            case PR_SockOpt_McastTimeToLive:
+            {
+                PRUint8 ttl;
+                length = sizeof(ttl);
+                rv = getsockopt(
+                         fd->secret->md.osfd, level, name,
+                         (char*)&ttl, &length);
+                PR_ASSERT((-1 == rv) || (sizeof(ttl) == length));
+                data->value.mcast_ttl = ttl;
+                break;
+            }
+            case PR_SockOpt_AddMember:
+            case PR_SockOpt_DropMember:
+            {
+                struct ip_mreq mreq;
+                length = sizeof(mreq);
+                rv = getsockopt(
+                         fd->secret->md.osfd, level, name, (char*)&mreq, &length);
+                PR_ASSERT((-1 == rv) || (sizeof(mreq) == length));
+                data->value.add_member.mcaddr.inet.ip =
+                    mreq.imr_multiaddr.s_addr;
+                data->value.add_member.ifaddr.inet.ip =
+                    mreq.imr_interface.s_addr;
+                break;
+            }
+            case PR_SockOpt_McastInterface:
+            {
+                length = sizeof(data->value.mcast_if.inet.ip);
+                rv = getsockopt(
+                         fd->secret->md.osfd, level, name,
+                         (char*)&data->value.mcast_if.inet.ip, &length);
+                PR_ASSERT((-1 == rv)
+                          || (sizeof(data->value.mcast_if.inet.ip) == length));
+                break;
+            }
+            case PR_SockOpt_DontFrag:
+            {
+#if !defined(DARWIN) && !defined(LINUX) && !defined(ANDROID)
+                PR_SetError(PR_OPERATION_NOT_SUPPORTED_ERROR, 0);
+                rv = PR_FAILURE;
+#else
+                PRIntn value;
+                length = sizeof(value);
+                rv = getsockopt(
+                         fd->secret->md.osfd, level, name, (char*)&value,
+                         &length);
+#if defined(DARWIN)
+                data->value.dont_fragment = value;
+#else
+                data->value.dont_fragment = (value == IP_PMTUDISC_DO) ? 1 : 0;
+#endif
+#endif /* !(!defined(DARWIN) && !defined(LINUX) && !defined(ANDROID)) */
+                break;
+            }
+            default:
+                PR_NOT_REACHED("Unknown socket option");
+                break;
+        }
+        if (-1 == rv) {
+            _PR_MD_MAP_GETSOCKOPT_ERROR(errno);
+        }
+    }
+    return (-1 == rv) ? PR_FAILURE : PR_SUCCESS;
+}  /* pt_GetSocketOption */
+
+static PRStatus pt_SetSocketOption(PRFileDesc *fd, const PRSocketOptionData *data)
+{
+    PRIntn rv;
+    PRInt32 level, name;
+
+    /*
+     * PR_SockOpt_Nonblocking is a special case that does not
+     * translate to a setsockopt call.
+     */
+    if (PR_SockOpt_Nonblocking == data->option)
+    {
+        fd->secret->nonblocking = data->value.non_blocking;
+        return PR_SUCCESS;
+    }
+
+    rv = _PR_MapOptionName(data->option, &level, &name);
+    if (PR_SUCCESS == rv)
+    {
+        switch (data->option)
+        {
+            case PR_SockOpt_Linger:
+            {
+                struct linger linger;
+                linger.l_onoff = data->value.linger.polarity;
+                linger.l_linger = PR_IntervalToSeconds(data->value.linger.linger);
+                rv = setsockopt(
+                         fd->secret->md.osfd, level, name, (char*)&linger, sizeof(linger));
+                break;
+            }
+            case PR_SockOpt_Reuseaddr:
+            case PR_SockOpt_Keepalive:
+            case PR_SockOpt_NoDelay:
+            case PR_SockOpt_Broadcast:
+            case PR_SockOpt_Reuseport:
+            {
+                PRIntn value = (data->value.reuse_addr) ? 1 : 0;
+                rv = setsockopt(
+                         fd->secret->md.osfd, level, name,
+                         (char*)&value, sizeof(PRIntn));
+#ifdef LINUX
+                /* for pt_LinuxSendFile */
+                if (name == TCP_NODELAY && rv == 0) {
+                    fd->secret->md.tcp_nodelay = value;
+                }
+#endif
+                break;
+            }
+            case PR_SockOpt_McastLoopback:
+            {
+                PRUint8 xbool = data->value.mcast_loopback ? 1 : 0;
+                rv = setsockopt(
+                         fd->secret->md.osfd, level, name,
+                         (char*)&xbool, sizeof(xbool));
+                break;
+            }
+            case PR_SockOpt_RecvBufferSize:
+            case PR_SockOpt_SendBufferSize:
+            case PR_SockOpt_MaxSegment:
+            {
+                PRIntn value = data->value.recv_buffer_size;
+                rv = setsockopt(
+                         fd->secret->md.osfd, level, name,
+                         (char*)&value, sizeof(PRIntn));
+                break;
+            }
+            case PR_SockOpt_IpTimeToLive:
+            case PR_SockOpt_IpTypeOfService:
+            {
+                rv = setsockopt(
+                         fd->secret->md.osfd, level, name,
+                         (char*)&data->value.ip_ttl, sizeof(PRUintn));
+                break;
+            }
+            case PR_SockOpt_McastTimeToLive:
+            {
+                PRUint8 ttl = data->value.mcast_ttl;
+                rv = setsockopt(
+                         fd->secret->md.osfd, level, name,
+                         (char*)&ttl, sizeof(ttl));
+                break;
+            }
+            case PR_SockOpt_AddMember:
+            case PR_SockOpt_DropMember:
+            {
+                struct ip_mreq mreq;
+                mreq.imr_multiaddr.s_addr =
+                    data->value.add_member.mcaddr.inet.ip;
+                mreq.imr_interface.s_addr =
+                    data->value.add_member.ifaddr.inet.ip;
+                rv = setsockopt(
+                         fd->secret->md.osfd, level, name,
+                         (char*)&mreq, sizeof(mreq));
+                break;
+            }
+            case PR_SockOpt_McastInterface:
+            {
+                rv = setsockopt(
+                         fd->secret->md.osfd, level, name,
+                         (char*)&data->value.mcast_if.inet.ip,
+                         sizeof(data->value.mcast_if.inet.ip));
+                break;
+            }
+            case PR_SockOpt_DontFrag:
+            {
+#if !defined(DARWIN) && !defined(LINUX) && !defined(ANDROID)
+                PR_SetError(PR_OPERATION_NOT_SUPPORTED_ERROR, 0);
+                rv = PR_FAILURE;
+#else
+                PRIntn value;
+#if defined(LINUX) || defined(ANDROID)
+                value = (data->value.dont_fragment) ? IP_PMTUDISC_DO
+                                                    : IP_PMTUDISC_DONT;
+#elif defined(DARWIN)
+                value = data->value.dont_fragment;
+#endif
+                rv = setsockopt(
+                         fd->secret->md.osfd, level, name, (char*)&value,
+                         sizeof(value));
+#endif /* !defined(DARWIN) && !defined(LINUX) && !defined(ANDROID)) */
+                break;
+            }
+            default:
+                PR_NOT_REACHED("Unknown socket option");
+                break;
+        }
+        if (-1 == rv) {
+            _PR_MD_MAP_SETSOCKOPT_ERROR(errno);
+        }
+    }
+    return (-1 == rv) ? PR_FAILURE : PR_SUCCESS;
+}  /* pt_SetSocketOption */
+
+/*****************************************************************************/
+/****************************** I/O method objects ***************************/
+/*****************************************************************************/
+
+static PRIOMethods _pr_file_methods = {
+    PR_DESC_FILE,
+    pt_Close,
+    pt_Read,
+    pt_Write,
+    pt_Available_f,
+    pt_Available64_f,
+    pt_Fsync,
+    pt_Seek,
+    pt_Seek64,
+    pt_FileInfo,
+    pt_FileInfo64,
+    (PRWritevFN)_PR_InvalidInt,
+    (PRConnectFN)_PR_InvalidStatus,
+    (PRAcceptFN)_PR_InvalidDesc,
+    (PRBindFN)_PR_InvalidStatus,
+    (PRListenFN)_PR_InvalidStatus,
+    (PRShutdownFN)_PR_InvalidStatus,
+    (PRRecvFN)_PR_InvalidInt,
+    (PRSendFN)_PR_InvalidInt,
+    (PRRecvfromFN)_PR_InvalidInt,
+    (PRSendtoFN)_PR_InvalidInt,
+    pt_Poll,
+    (PRAcceptreadFN)_PR_InvalidInt,
+    (PRTransmitfileFN)_PR_InvalidInt,
+    (PRGetsocknameFN)_PR_InvalidStatus,
+    (PRGetpeernameFN)_PR_InvalidStatus,
+    (PRReservedFN)_PR_InvalidInt,
+    (PRReservedFN)_PR_InvalidInt,
+    (PRGetsocketoptionFN)_PR_InvalidStatus,
+    (PRSetsocketoptionFN)_PR_InvalidStatus,
+    (PRSendfileFN)_PR_InvalidInt,
+    (PRConnectcontinueFN)_PR_InvalidStatus,
+    (PRReservedFN)_PR_InvalidInt,
+    (PRReservedFN)_PR_InvalidInt,
+    (PRReservedFN)_PR_InvalidInt,
+    (PRReservedFN)_PR_InvalidInt
+};
+
+static PRIOMethods _pr_pipe_methods = {
+    PR_DESC_PIPE,
+    pt_Close,
+    pt_Read,
+    pt_Write,
+    pt_Available_s,
+    pt_Available64_s,
+    pt_Synch,
+    (PRSeekFN)_PR_InvalidInt,
+    (PRSeek64FN)_PR_InvalidInt64,
+    (PRFileInfoFN)_PR_InvalidStatus,
+    (PRFileInfo64FN)_PR_InvalidStatus,
+    (PRWritevFN)_PR_InvalidInt,
+    (PRConnectFN)_PR_InvalidStatus,
+    (PRAcceptFN)_PR_InvalidDesc,
+    (PRBindFN)_PR_InvalidStatus,
+    (PRListenFN)_PR_InvalidStatus,
+    (PRShutdownFN)_PR_InvalidStatus,
+    (PRRecvFN)_PR_InvalidInt,
+    (PRSendFN)_PR_InvalidInt,
+    (PRRecvfromFN)_PR_InvalidInt,
+    (PRSendtoFN)_PR_InvalidInt,
+    pt_Poll,
+    (PRAcceptreadFN)_PR_InvalidInt,
+    (PRTransmitfileFN)_PR_InvalidInt,
+    (PRGetsocknameFN)_PR_InvalidStatus,
+    (PRGetpeernameFN)_PR_InvalidStatus,
+    (PRReservedFN)_PR_InvalidInt,
+    (PRReservedFN)_PR_InvalidInt,
+    (PRGetsocketoptionFN)_PR_InvalidStatus,
+    (PRSetsocketoptionFN)_PR_InvalidStatus,
+    (PRSendfileFN)_PR_InvalidInt,
+    (PRConnectcontinueFN)_PR_InvalidStatus,
+    (PRReservedFN)_PR_InvalidInt,
+    (PRReservedFN)_PR_InvalidInt,
+    (PRReservedFN)_PR_InvalidInt,
+    (PRReservedFN)_PR_InvalidInt
+};
+
+static PRIOMethods _pr_tcp_methods = {
+    PR_DESC_SOCKET_TCP,
+    pt_Close,
+    pt_SocketRead,
+    pt_SocketWrite,
+    pt_Available_s,
+    pt_Available64_s,
+    pt_Synch,
+    (PRSeekFN)_PR_InvalidInt,
+    (PRSeek64FN)_PR_InvalidInt64,
+    (PRFileInfoFN)_PR_InvalidStatus,
+    (PRFileInfo64FN)_PR_InvalidStatus,
+    pt_Writev,
+    pt_Connect,
+    pt_Accept,
+    pt_Bind,
+    pt_Listen,
+    pt_Shutdown,
+    pt_Recv,
+    pt_Send,
+    (PRRecvfromFN)_PR_InvalidInt,
+#if defined(LINUX) || defined(DARWIN)
+    pt_TCP_SendTo, /* This is for TCP Fast Open. Linux uses SendTo function for this. OSX uses connectx, but we imitate Linux. */
+#else
+    (PRSendtoFN)_PR_InvalidInt,
+#endif
+    pt_Poll,
+    pt_AcceptRead,
+    pt_TransmitFile,
+    pt_GetSockName,
+    pt_GetPeerName,
+    (PRReservedFN)_PR_InvalidInt,
+    (PRReservedFN)_PR_InvalidInt,
+    pt_GetSocketOption,
+    pt_SetSocketOption,
+    pt_SendFile,
+    pt_ConnectContinue,
+    (PRReservedFN)_PR_InvalidInt,
+    (PRReservedFN)_PR_InvalidInt,
+    (PRReservedFN)_PR_InvalidInt,
+    (PRReservedFN)_PR_InvalidInt
+};
+
+static PRIOMethods _pr_udp_methods = {
+    PR_DESC_SOCKET_UDP,
+    pt_Close,
+    pt_SocketRead,
+    pt_SocketWrite,
+    pt_Available_s,
+    pt_Available64_s,
+    pt_Synch,
+    (PRSeekFN)_PR_InvalidInt,
+    (PRSeek64FN)_PR_InvalidInt64,
+    (PRFileInfoFN)_PR_InvalidStatus,
+    (PRFileInfo64FN)_PR_InvalidStatus,
+    pt_Writev,
+    pt_Connect,
+    (PRAcceptFN)_PR_InvalidDesc,
+    pt_Bind,
+    pt_Listen,
+    pt_Shutdown,
+    pt_Recv,
+    pt_Send,
+    pt_RecvFrom,
+    pt_SendTo,
+    pt_Poll,
+    (PRAcceptreadFN)_PR_InvalidInt,
+    (PRTransmitfileFN)_PR_InvalidInt,
+    pt_GetSockName,
+    pt_GetPeerName,
+    (PRReservedFN)_PR_InvalidInt,
+    (PRReservedFN)_PR_InvalidInt,
+    pt_GetSocketOption,
+    pt_SetSocketOption,
+    (PRSendfileFN)_PR_InvalidInt,
+    (PRConnectcontinueFN)_PR_InvalidStatus,
+    (PRReservedFN)_PR_InvalidInt,
+    (PRReservedFN)_PR_InvalidInt,
+    (PRReservedFN)_PR_InvalidInt,
+    (PRReservedFN)_PR_InvalidInt
+};
+
+static PRIOMethods _pr_socketpollfd_methods = {
+    (PRDescType) 0,
+    (PRCloseFN)_PR_InvalidStatus,
+    (PRReadFN)_PR_InvalidInt,
+    (PRWriteFN)_PR_InvalidInt,
+    (PRAvailableFN)_PR_InvalidInt,
+    (PRAvailable64FN)_PR_InvalidInt64,
+    (PRFsyncFN)_PR_InvalidStatus,
+    (PRSeekFN)_PR_InvalidInt,
+    (PRSeek64FN)_PR_InvalidInt64,
+    (PRFileInfoFN)_PR_InvalidStatus,
+    (PRFileInfo64FN)_PR_InvalidStatus,
+    (PRWritevFN)_PR_InvalidInt,
+    (PRConnectFN)_PR_InvalidStatus,
+    (PRAcceptFN)_PR_InvalidDesc,
+    (PRBindFN)_PR_InvalidStatus,
+    (PRListenFN)_PR_InvalidStatus,
+    (PRShutdownFN)_PR_InvalidStatus,
+    (PRRecvFN)_PR_InvalidInt,
+    (PRSendFN)_PR_InvalidInt,
+    (PRRecvfromFN)_PR_InvalidInt,
+    (PRSendtoFN)_PR_InvalidInt,
+    pt_Poll,
+    (PRAcceptreadFN)_PR_InvalidInt,
+    (PRTransmitfileFN)_PR_InvalidInt,
+    (PRGetsocknameFN)_PR_InvalidStatus,
+    (PRGetpeernameFN)_PR_InvalidStatus,
+    (PRReservedFN)_PR_InvalidInt,
+    (PRReservedFN)_PR_InvalidInt,
+    (PRGetsocketoptionFN)_PR_InvalidStatus,
+    (PRSetsocketoptionFN)_PR_InvalidStatus,
+    (PRSendfileFN)_PR_InvalidInt,
+    (PRConnectcontinueFN)_PR_InvalidStatus,
+    (PRReservedFN)_PR_InvalidInt,
+    (PRReservedFN)_PR_InvalidInt,
+    (PRReservedFN)_PR_InvalidInt,
+    (PRReservedFN)_PR_InvalidInt
+};
+
+#if defined(HPUX) || defined(SOLARIS) \
+    || defined(LINUX) || defined(__GNU__) || defined(__GLIBC__) \
+    || defined(AIX) || defined(FREEBSD) || defined(NETBSD) \
+    || defined(OPENBSD) || defined(BSDI) || defined(NTO) \
+    || defined(DARWIN) || defined(UNIXWARE) || defined(RISCOS)
+#define _PR_FCNTL_FLAGS O_NONBLOCK
+#else
+#error "Can't determine architecture"
+#endif
+
+/*
+ * Put a Unix file descriptor in non-blocking mode.
+ */
+static void pt_MakeFdNonblock(PRIntn osfd)
+{
+    PRIntn flags;
+    flags = fcntl(osfd, F_GETFL, 0);
+    flags |= _PR_FCNTL_FLAGS;
+    (void)fcntl(osfd, F_SETFL, flags);
+}
+
+/*
+ * Put a Unix socket fd in non-blocking mode that can
+ * ideally be inherited by an accepted socket.
+ *
+ * Why doesn't pt_MakeFdNonblock do?  This is to deal with
+ * the special case of HP-UX.  HP-UX has three kinds of
+ * non-blocking modes for sockets: the fcntl() O_NONBLOCK
+ * and O_NDELAY flags and ioctl() FIOSNBIO request.  Only
+ * the ioctl() FIOSNBIO form of non-blocking mode is
+ * inherited by an accepted socket.
+ *
+ * Other platforms just use the generic pt_MakeFdNonblock
+ * to put a socket in non-blocking mode.
+ */
+#ifdef HPUX
+static void pt_MakeSocketNonblock(PRIntn osfd)
+{
+    PRIntn one = 1;
+    (void)ioctl(osfd, FIOSNBIO, &one);
+}
+#else
+#define pt_MakeSocketNonblock pt_MakeFdNonblock
+#endif
+
+static PRFileDesc *pt_SetMethods(
+    PRIntn osfd, PRDescType type, PRBool isAcceptedSocket, PRBool imported)
+{
+    PRFileDesc *fd = _PR_Getfd();
+
+    if (fd == NULL) {
+        PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+    }
+    else
+    {
+        fd->secret->md.osfd = osfd;
+        fd->secret->state = _PR_FILEDESC_OPEN;
+        if (imported) {
+            fd->secret->inheritable = _PR_TRI_UNKNOWN;
+        }
+        else
+        {
+            /* By default, a Unix fd is not closed on exec. */
+#ifdef DEBUG
+            PRIntn flags;
+            flags = fcntl(osfd, F_GETFD, 0);
+            PR_ASSERT(0 == flags);
+#endif
+            fd->secret->inheritable = _PR_TRI_TRUE;
+        }
+        switch (type)
+        {
+            case PR_DESC_FILE:
+                fd->methods = PR_GetFileMethods();
+                break;
+            case PR_DESC_SOCKET_TCP:
+                fd->methods = PR_GetTCPMethods();
+#ifdef _PR_ACCEPT_INHERIT_NONBLOCK
+                if (!isAcceptedSocket) {
+                    pt_MakeSocketNonblock(osfd);
+                }
+#else
+                pt_MakeSocketNonblock(osfd);
+#endif
+                break;
+            case PR_DESC_SOCKET_UDP:
+                fd->methods = PR_GetUDPMethods();
+                pt_MakeFdNonblock(osfd);
+                break;
+            case PR_DESC_PIPE:
+                fd->methods = PR_GetPipeMethods();
+                pt_MakeFdNonblock(osfd);
+                break;
+            default:
+                break;
+        }
+    }
+    return fd;
+}  /* pt_SetMethods */
+
+PR_IMPLEMENT(const PRIOMethods*) PR_GetFileMethods(void)
+{
+    return &_pr_file_methods;
+}  /* PR_GetFileMethods */
+
+PR_IMPLEMENT(const PRIOMethods*) PR_GetPipeMethods(void)
+{
+    return &_pr_pipe_methods;
+}  /* PR_GetPipeMethods */
+
+PR_IMPLEMENT(const PRIOMethods*) PR_GetTCPMethods(void)
+{
+    return &_pr_tcp_methods;
+}  /* PR_GetTCPMethods */
+
+PR_IMPLEMENT(const PRIOMethods*) PR_GetUDPMethods(void)
+{
+    return &_pr_udp_methods;
+}  /* PR_GetUDPMethods */
+
+static const PRIOMethods* PR_GetSocketPollFdMethods(void)
+{
+    return &_pr_socketpollfd_methods;
+}  /* PR_GetSocketPollFdMethods */
+
+PR_IMPLEMENT(PRFileDesc*) PR_AllocFileDesc(
+    PRInt32 osfd, const PRIOMethods *methods)
+{
+    PRFileDesc *fd = _PR_Getfd();
+
+    if (NULL == fd) {
+        goto failed;
+    }
+
+    fd->methods = methods;
+    fd->secret->md.osfd = osfd;
+    /* Make fd non-blocking */
+    if (osfd > 2)
+    {
+        /* Don't mess around with stdin, stdout or stderr */
+        if (&_pr_tcp_methods == methods) {
+            pt_MakeSocketNonblock(osfd);
+        }
+        else {
+            pt_MakeFdNonblock(osfd);
+        }
+    }
+    fd->secret->state = _PR_FILEDESC_OPEN;
+    fd->secret->inheritable = _PR_TRI_UNKNOWN;
+    return fd;
+
+failed:
+    PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+    return fd;
+}  /* PR_AllocFileDesc */
+
+#if !defined(_PR_INET6) || defined(_PR_INET6_PROBE)
+PR_EXTERN(PRStatus) _pr_push_ipv6toipv4_layer(PRFileDesc *fd);
+#if defined(_PR_INET6_PROBE)
+extern PRBool _pr_ipv6_is_present(void);
+PR_IMPLEMENT(PRBool) _pr_test_ipv6_socket()
+{
+    int osfd;
+
+#if defined(DARWIN)
+    /*
+     * Disable IPv6 if Darwin version is less than 7.0.0 (OS X 10.3).  IPv6 on
+     * lesser versions is not ready for general use (see bug 222031).
+     */
+    {
+        struct utsname u;
+        if (uname(&u) != 0 || atoi(u.release) < 7) {
+            return PR_FALSE;
+        }
+    }
+#endif
+
+    /*
+     * HP-UX only: HP-UX IPv6 Porting Guide (dated February 2001)
+     * suggests that we call open("/dev/ip6", O_RDWR) to determine
+     * whether IPv6 APIs and the IPv6 stack are on the system.
+     * Our portable test below seems to work fine, so I am using it.
+     */
+    osfd = socket(AF_INET6, SOCK_STREAM, 0);
+    if (osfd != -1) {
+        close(osfd);
+        return PR_TRUE;
+    }
+    return PR_FALSE;
+}
+#endif  /* _PR_INET6_PROBE */
+#endif
+
+PR_IMPLEMENT(PRFileDesc*) PR_Socket(PRInt32 domain, PRInt32 type, PRInt32 proto)
+{
+    PRIntn osfd;
+    PRDescType ftype;
+    PRFileDesc *fd = NULL;
+#if defined(_PR_INET6_PROBE) || !defined(_PR_INET6)
+    PRInt32 tmp_domain = domain;
+#endif
+
+    if (!_pr_initialized) {
+        _PR_ImplicitInitialization();
+    }
+
+    if (pt_TestAbort()) {
+        return NULL;
+    }
+
+    if (PF_INET != domain
+        && PR_AF_INET6 != domain
+#if defined(_PR_HAVE_SDP)
+        && PR_AF_INET_SDP != domain
+#if defined(SOLARIS)
+        && PR_AF_INET6_SDP != domain
+#endif /* SOLARIS */
+#endif /* _PR_HAVE_SDP */
+        && PF_UNIX != domain)
+    {
+        PR_SetError(PR_ADDRESS_NOT_SUPPORTED_ERROR, 0);
+        return fd;
+    }
+    if (type == SOCK_STREAM) {
+        ftype = PR_DESC_SOCKET_TCP;
+    }
+    else if (type == SOCK_DGRAM) {
+        ftype = PR_DESC_SOCKET_UDP;
+    }
+    else
+    {
+        (void)PR_SetError(PR_ADDRESS_NOT_SUPPORTED_ERROR, 0);
+        return fd;
+    }
+#if defined(_PR_HAVE_SDP)
+#if defined(LINUX)
+    if (PR_AF_INET_SDP == domain) {
+        domain = AF_INET_SDP;
+    }
+#elif defined(SOLARIS)
+    if (PR_AF_INET_SDP == domain) {
+        domain = AF_INET;
+        proto = PROTO_SDP;
+    } else if(PR_AF_INET6_SDP == domain) {
+        domain = AF_INET6;
+        proto = PROTO_SDP;
+    }
+#endif /* SOLARIS */
+#endif /* _PR_HAVE_SDP */
+#if defined(_PR_INET6_PROBE)
+    if (PR_AF_INET6 == domain) {
+        domain = _pr_ipv6_is_present() ? AF_INET6 : AF_INET;
+    }
+#elif defined(_PR_INET6)
+    if (PR_AF_INET6 == domain) {
+        domain = AF_INET6;
+    }
+#else
+    if (PR_AF_INET6 == domain) {
+        domain = AF_INET;
+    }
+#endif
+
+    osfd = socket(domain, type, proto);
+    if (osfd == -1) {
+        pt_MapError(_PR_MD_MAP_SOCKET_ERROR, errno);
+    }
+    else
+    {
+#ifdef _PR_IPV6_V6ONLY_PROBE
+        if ((domain == AF_INET6) && _pr_ipv6_v6only_on_by_default)
+        {
+            int on = 0;
+            (void)setsockopt(osfd, IPPROTO_IPV6, IPV6_V6ONLY,
+                             &on, sizeof(on));
+        }
+#endif
+        fd = pt_SetMethods(osfd, ftype, PR_FALSE, PR_FALSE);
+        if (fd == NULL) {
+            close(osfd);
+        }
+    }
+#ifdef _PR_NEED_SECRET_AF
+    if (fd != NULL) {
+        fd->secret->af = domain;
+    }
+#endif
+#if defined(_PR_INET6_PROBE) || !defined(_PR_INET6)
+    if (fd != NULL) {
+        /*
+         * For platforms with no support for IPv6
+         * create layered socket for IPv4-mapped IPv6 addresses
+         */
+        if (PR_AF_INET6 == tmp_domain && PR_AF_INET == domain) {
+            if (PR_FAILURE == _pr_push_ipv6toipv4_layer(fd)) {
+                PR_Close(fd);
+                fd = NULL;
+            }
+        }
+    }
+#endif
+    return fd;
+}  /* PR_Socket */
+
+/*****************************************************************************/
+/****************************** I/O public methods ***************************/
+/*****************************************************************************/
+
+PR_IMPLEMENT(PRFileDesc*) PR_OpenFile(
+    const char *name, PRIntn flags, PRIntn mode)
+{
+    PRFileDesc *fd = NULL;
+    PRIntn syserrno, osfd = -1, osflags = 0;;
+
+    if (!_pr_initialized) {
+        _PR_ImplicitInitialization();
+    }
+
+    if (pt_TestAbort()) {
+        return NULL;
+    }
+
+    if (flags & PR_RDONLY) {
+        osflags |= O_RDONLY;
+    }
+    if (flags & PR_WRONLY) {
+        osflags |= O_WRONLY;
+    }
+    if (flags & PR_RDWR) {
+        osflags |= O_RDWR;
+    }
+    if (flags & PR_APPEND) {
+        osflags |= O_APPEND;
+    }
+    if (flags & PR_TRUNCATE) {
+        osflags |= O_TRUNC;
+    }
+    if (flags & PR_EXCL) {
+        osflags |= O_EXCL;
+    }
+    if (flags & PR_SYNC)
+    {
+#if defined(O_SYNC)
+        osflags |= O_SYNC;
+#elif defined(O_FSYNC)
+        osflags |= O_FSYNC;
+#else
+#error "Neither O_SYNC nor O_FSYNC is defined on this platform"
+#endif
+    }
+
+    /*
+    ** We have to hold the lock across the creation in order to
+    ** enforce the sematics of PR_Rename(). (see the latter for
+    ** more details)
+    */
+    if (flags & PR_CREATE_FILE)
+    {
+        osflags |= O_CREAT;
+        if (NULL !=_pr_rename_lock) {
+            PR_Lock(_pr_rename_lock);
+        }
+    }
+
+    osfd = _md_iovector._open64(name, osflags, mode);
+    syserrno = errno;
+
+    if ((flags & PR_CREATE_FILE) && (NULL !=_pr_rename_lock)) {
+        PR_Unlock(_pr_rename_lock);
+    }
+
+    if (osfd == -1) {
+        pt_MapError(_PR_MD_MAP_OPEN_ERROR, syserrno);
+    }
+    else
+    {
+        fd = pt_SetMethods(osfd, PR_DESC_FILE, PR_FALSE, PR_FALSE);
+        if (fd == NULL) {
+            close(osfd);    /* $$$ whoops! this is bad $$$ */
+        }
+    }
+    return fd;
+}  /* PR_OpenFile */
+
+PR_IMPLEMENT(PRFileDesc*) PR_Open(const char *name, PRIntn flags, PRIntn mode)
+{
+    return PR_OpenFile(name, flags, mode);
+}  /* PR_Open */
+
+PR_IMPLEMENT(PRStatus) PR_Delete(const char *name)
+{
+    PRIntn rv = -1;
+
+    if (!_pr_initialized) {
+        _PR_ImplicitInitialization();
+    }
+
+    if (pt_TestAbort()) {
+        return PR_FAILURE;
+    }
+
+    rv = unlink(name);
+
+    if (rv == -1) {
+        pt_MapError(_PR_MD_MAP_UNLINK_ERROR, errno);
+        return PR_FAILURE;
+    }
+    return PR_SUCCESS;
+}  /* PR_Delete */
+
+PR_IMPLEMENT(PRStatus) PR_Access(const char *name, PRAccessHow how)
+{
+    PRIntn rv;
+
+    if (pt_TestAbort()) {
+        return PR_FAILURE;
+    }
+
+    switch (how)
+    {
+        case PR_ACCESS_READ_OK:
+            rv =  access(name, R_OK);
+            break;
+        case PR_ACCESS_WRITE_OK:
+            rv = access(name, W_OK);
+            break;
+        case PR_ACCESS_EXISTS:
+        default:
+            rv = access(name, F_OK);
+    }
+    if (0 == rv) {
+        return PR_SUCCESS;
+    }
+    pt_MapError(_PR_MD_MAP_ACCESS_ERROR, errno);
+    return PR_FAILURE;
+
+}  /* PR_Access */
+
+PR_IMPLEMENT(PRStatus) PR_GetFileInfo(const char *fn, PRFileInfo *info)
+{
+    PRInt32 rv = _PR_MD_GETFILEINFO(fn, info);
+    return (0 == rv) ? PR_SUCCESS : PR_FAILURE;
+}  /* PR_GetFileInfo */
+
+PR_IMPLEMENT(PRStatus) PR_GetFileInfo64(const char *fn, PRFileInfo64 *info)
+{
+    PRInt32 rv;
+
+    if (!_pr_initialized) {
+        _PR_ImplicitInitialization();
+    }
+    rv = _PR_MD_GETFILEINFO64(fn, info);
+    return (0 == rv) ? PR_SUCCESS : PR_FAILURE;
+}  /* PR_GetFileInfo64 */
+
+PR_IMPLEMENT(PRStatus) PR_Rename(const char *from, const char *to)
+{
+    PRIntn rv = -1;
+
+    if (pt_TestAbort()) {
+        return PR_FAILURE;
+    }
+
+    /*
+    ** We have to acquire a lock here to stiffle anybody trying to create
+    ** a new file at the same time. And we have to hold that lock while we
+    ** test to see if the file exists and do the rename. The other place
+    ** where the lock is held is in PR_Open() when possibly creating a
+    ** new file.
+    */
+
+    PR_Lock(_pr_rename_lock);
+    rv = access(to, F_OK);
+    if (0 == rv)
+    {
+        PR_SetError(PR_FILE_EXISTS_ERROR, 0);
+        rv = -1;
+    }
+    else
+    {
+        rv = rename(from, to);
+        if (rv == -1) {
+            pt_MapError(_PR_MD_MAP_RENAME_ERROR, errno);
+        }
+    }
+    PR_Unlock(_pr_rename_lock);
+    return (-1 == rv) ? PR_FAILURE : PR_SUCCESS;
+}  /* PR_Rename */
+
+PR_IMPLEMENT(PRStatus) PR_CloseDir(PRDir *dir)
+{
+    if (pt_TestAbort()) {
+        return PR_FAILURE;
+    }
+
+    if (NULL != dir->md.d)
+    {
+        if (closedir(dir->md.d) == -1)
+        {
+            _PR_MD_MAP_CLOSEDIR_ERROR(errno);
+            return PR_FAILURE;
+        }
+        dir->md.d = NULL;
+        PR_DELETE(dir);
+    }
+    return PR_SUCCESS;
+}  /* PR_CloseDir */
+
+PR_IMPLEMENT(PRStatus) PR_MakeDir(const char *name, PRIntn mode)
+{
+    PRInt32 rv = -1;
+
+    if (pt_TestAbort()) {
+        return PR_FAILURE;
+    }
+
+    /*
+    ** This lock is used to enforce rename semantics as described
+    ** in PR_Rename.
+    */
+    if (NULL !=_pr_rename_lock) {
+        PR_Lock(_pr_rename_lock);
+    }
+    rv = mkdir(name, mode);
+    if (-1 == rv) {
+        pt_MapError(_PR_MD_MAP_MKDIR_ERROR, errno);
+    }
+    if (NULL !=_pr_rename_lock) {
+        PR_Unlock(_pr_rename_lock);
+    }
+
+    return (-1 == rv) ? PR_FAILURE : PR_SUCCESS;
+}  /* PR_Makedir */
+
+PR_IMPLEMENT(PRStatus) PR_MkDir(const char *name, PRIntn mode)
+{
+    return PR_MakeDir(name, mode);
+}  /* PR_Mkdir */
+
+PR_IMPLEMENT(PRStatus) PR_RmDir(const char *name)
+{
+    PRInt32 rv;
+
+    if (pt_TestAbort()) {
+        return PR_FAILURE;
+    }
+
+    rv = rmdir(name);
+    if (0 == rv) {
+        return PR_SUCCESS;
+    }
+    pt_MapError(_PR_MD_MAP_RMDIR_ERROR, errno);
+    return PR_FAILURE;
+}  /* PR_Rmdir */
+
+
+PR_IMPLEMENT(PRDir*) PR_OpenDir(const char *name)
+{
+    DIR *osdir;
+    PRDir *dir = NULL;
+
+    if (pt_TestAbort()) {
+        return dir;
+    }
+
+    osdir = opendir(name);
+    if (osdir == NULL) {
+        pt_MapError(_PR_MD_MAP_OPENDIR_ERROR, errno);
+    }
+    else
+    {
+        dir = PR_NEWZAP(PRDir);
+        if (dir) {
+            dir->md.d = osdir;
+        }
+        else {
+            (void)closedir(osdir);
+        }
+    }
+    return dir;
+}  /* PR_OpenDir */
+
+static PRInt32 _pr_poll_with_poll(
+    PRPollDesc *pds, PRIntn npds, PRIntervalTime timeout)
+{
+    PRInt32 ready = 0;
+    /*
+     * For restarting poll() if it is interrupted by a signal.
+     * We use these variables to figure out how much time has
+     * elapsed and how much of the timeout still remains.
+     */
+    PRIntervalTime start = 0, elapsed, remaining;
+
+    if (pt_TestAbort()) {
+        return -1;
+    }
+
+    if (0 == npds) {
+        PR_Sleep(timeout);
+    }
+    else
+    {
+#define STACK_POLL_DESC_COUNT 64
+        struct pollfd stack_syspoll[STACK_POLL_DESC_COUNT];
+        struct pollfd *syspoll;
+        PRIntn index, msecs;
+
+        if (npds <= STACK_POLL_DESC_COUNT)
+        {
+            syspoll = stack_syspoll;
+        }
+        else
+        {
+            PRThread *me = PR_GetCurrentThread();
+            if (npds > me->syspoll_count)
+            {
+                PR_Free(me->syspoll_list);
+                me->syspoll_list =
+                    (struct pollfd*)PR_MALLOC(npds * sizeof(struct pollfd));
+                if (NULL == me->syspoll_list)
+                {
+                    me->syspoll_count = 0;
+                    PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+                    return -1;
+                }
+                me->syspoll_count = npds;
+            }
+            syspoll = me->syspoll_list;
+        }
+
+        for (index = 0; index < npds; ++index)
+        {
+            PRInt16 in_flags_read = 0, in_flags_write = 0;
+            PRInt16 out_flags_read = 0, out_flags_write = 0;
+
+            if ((NULL != pds[index].fd) && (0 != pds[index].in_flags))
+            {
+                if (pds[index].in_flags & PR_POLL_READ)
+                {
+                    in_flags_read = (pds[index].fd->methods->poll)(
+                                        pds[index].fd,
+                                        pds[index].in_flags & ~PR_POLL_WRITE,
+                                        &out_flags_read);
+                }
+                if (pds[index].in_flags & PR_POLL_WRITE)
+                {
+                    in_flags_write = (pds[index].fd->methods->poll)(
+                                         pds[index].fd,
+                                         pds[index].in_flags & ~PR_POLL_READ,
+                                         &out_flags_write);
+                }
+                if ((0 != (in_flags_read & out_flags_read))
+                    || (0 != (in_flags_write & out_flags_write)))
+                {
+                    /* this one is ready right now */
+                    if (0 == ready)
+                    {
+                        /*
+                         * We will return without calling the system
+                         * poll function.  So zero the out_flags
+                         * fields of all the poll descriptors before
+                         * this one.
+                         */
+                        int i;
+                        for (i = 0; i < index; i++)
+                        {
+                            pds[i].out_flags = 0;
+                        }
+                    }
+                    ready += 1;
+                    pds[index].out_flags = out_flags_read | out_flags_write;
+                }
+                else
+                {
+                    /* now locate the NSPR layer at the bottom of the stack */
+                    PRFileDesc *bottom = PR_GetIdentitiesLayer(
+                                             pds[index].fd, PR_NSPR_IO_LAYER);
+                    /* ignore a socket without PR_NSPR_IO_LAYER available */
+
+                    pds[index].out_flags = 0;  /* pre-condition */
+                    if ((NULL != bottom)
+                        && (_PR_FILEDESC_OPEN == bottom->secret->state))
+                    {
+                        if (0 == ready)
+                        {
+                            syspoll[index].fd = bottom->secret->md.osfd;
+                            syspoll[index].events = 0;
+                            if (in_flags_read & PR_POLL_READ)
+                            {
+                                pds[index].out_flags |=
+                                    _PR_POLL_READ_SYS_READ;
+                                syspoll[index].events |= POLLIN;
+                            }
+                            if (in_flags_read & PR_POLL_WRITE)
+                            {
+                                pds[index].out_flags |=
+                                    _PR_POLL_READ_SYS_WRITE;
+                                syspoll[index].events |= POLLOUT;
+                            }
+                            if (in_flags_write & PR_POLL_READ)
+                            {
+                                pds[index].out_flags |=
+                                    _PR_POLL_WRITE_SYS_READ;
+                                syspoll[index].events |= POLLIN;
+                            }
+                            if (in_flags_write & PR_POLL_WRITE)
+                            {
+                                pds[index].out_flags |=
+                                    _PR_POLL_WRITE_SYS_WRITE;
+                                syspoll[index].events |= POLLOUT;
+                            }
+                            if (pds[index].in_flags & PR_POLL_EXCEPT) {
+                                syspoll[index].events |= POLLPRI;
+                            }
+                        }
+                    }
+                    else
+                    {
+                        if (0 == ready)
+                        {
+                            int i;
+                            for (i = 0; i < index; i++)
+                            {
+                                pds[i].out_flags = 0;
+                            }
+                        }
+                        ready += 1;  /* this will cause an abrupt return */
+                        pds[index].out_flags = PR_POLL_NVAL;  /* bogii */
+                    }
+                }
+            }
+            else
+            {
+                /* make poll() ignore this entry */
+                syspoll[index].fd = -1;
+                syspoll[index].events = 0;
+                pds[index].out_flags = 0;
+            }
+        }
+        if (0 == ready)
+        {
+            switch (timeout)
+            {
+                case PR_INTERVAL_NO_WAIT: msecs = 0; break;
+                case PR_INTERVAL_NO_TIMEOUT: msecs = -1; break;
+                default:
+                    msecs = PR_IntervalToMilliseconds(timeout);
+                    start = PR_IntervalNow();
+            }
+
+retry:
+            ready = poll(syspoll, npds, msecs);
+            if (-1 == ready)
+            {
+                PRIntn oserror = errno;
+
+                if (EINTR == oserror)
+                {
+                    if (timeout == PR_INTERVAL_NO_TIMEOUT) {
+                        goto retry;
+                    }
+                    else if (timeout == PR_INTERVAL_NO_WAIT) {
+                        ready = 0;    /* don't retry, just time out */
+                    }
+                    else
+                    {
+                        elapsed = (PRIntervalTime) (PR_IntervalNow()
+                                                    - start);
+                        if (elapsed > timeout) {
+                            ready = 0;    /* timed out */
+                        }
+                        else
+                        {
+                            remaining = timeout - elapsed;
+                            msecs = PR_IntervalToMilliseconds(remaining);
+                            goto retry;
+                        }
+                    }
+                }
+                else
+                {
+                    _PR_MD_MAP_POLL_ERROR(oserror);
+                }
+            }
+            else if (ready > 0)
+            {
+                for (index = 0; index < npds; ++index)
+                {
+                    PRInt16 out_flags = 0;
+                    if ((NULL != pds[index].fd) && (0 != pds[index].in_flags))
+                    {
+                        if (0 != syspoll[index].revents)
+                        {
+                            if (syspoll[index].revents & POLLIN)
+                            {
+                                if (pds[index].out_flags
+                                    & _PR_POLL_READ_SYS_READ)
+                                {
+                                    out_flags |= PR_POLL_READ;
+                                }
+                                if (pds[index].out_flags
+                                    & _PR_POLL_WRITE_SYS_READ)
+                                {
+                                    out_flags |= PR_POLL_WRITE;
+                                }
+                            }
+                            if (syspoll[index].revents & POLLOUT)
+                            {
+                                if (pds[index].out_flags
+                                    & _PR_POLL_READ_SYS_WRITE)
+                                {
+                                    out_flags |= PR_POLL_READ;
+                                }
+                                if (pds[index].out_flags
+                                    & _PR_POLL_WRITE_SYS_WRITE)
+                                {
+                                    out_flags |= PR_POLL_WRITE;
+                                }
+                            }
+                            if (syspoll[index].revents & POLLPRI) {
+                                out_flags |= PR_POLL_EXCEPT;
+                            }
+                            if (syspoll[index].revents & POLLERR) {
+                                out_flags |= PR_POLL_ERR;
+                            }
+                            if (syspoll[index].revents & POLLNVAL) {
+                                out_flags |= PR_POLL_NVAL;
+                            }
+                            if (syspoll[index].revents & POLLHUP) {
+                                out_flags |= PR_POLL_HUP;
+                            }
+                        }
+                    }
+                    pds[index].out_flags = out_flags;
+                }
+            }
+        }
+    }
+    return ready;
+
+} /* _pr_poll_with_poll */
+
+#if defined(_PR_POLL_WITH_SELECT)
+/*
+ * HPUX report the POLLHUP event for a socket when the
+ * shutdown(SHUT_WR) operation is called for the remote end, even though
+ * the socket is still writeable. Use select(), instead of poll(), to
+ * workaround this problem.
+ */
+static PRInt32 _pr_poll_with_select(
+    PRPollDesc *pds, PRIntn npds, PRIntervalTime timeout)
+{
+    PRInt32 ready = 0;
+    /*
+     * For restarting select() if it is interrupted by a signal.
+     * We use these variables to figure out how much time has
+     * elapsed and how much of the timeout still remains.
+     */
+    PRIntervalTime start = 0, elapsed, remaining;
+
+    if (pt_TestAbort()) {
+        return -1;
+    }
+
+    if (0 == npds) {
+        PR_Sleep(timeout);
+    }
+    else
+    {
+#define STACK_POLL_DESC_COUNT 64
+        int stack_selectfd[STACK_POLL_DESC_COUNT];
+        int *selectfd;
+        fd_set rd, wr, ex, *rdp = NULL, *wrp = NULL, *exp = NULL;
+        struct timeval tv, *tvp;
+        PRIntn index, msecs, maxfd = 0;
+
+        if (npds <= STACK_POLL_DESC_COUNT)
+        {
+            selectfd = stack_selectfd;
+        }
+        else
+        {
+            PRThread *me = PR_GetCurrentThread();
+            if (npds > me->selectfd_count)
+            {
+                PR_Free(me->selectfd_list);
+                me->selectfd_list = (int *)PR_MALLOC(npds * sizeof(int));
+                if (NULL == me->selectfd_list)
+                {
+                    me->selectfd_count = 0;
+                    PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+                    return -1;
+                }
+                me->selectfd_count = npds;
+            }
+            selectfd = me->selectfd_list;
+        }
+        FD_ZERO(&rd);
+        FD_ZERO(&wr);
+        FD_ZERO(&ex);
+
+        for (index = 0; index < npds; ++index)
+        {
+            PRInt16 in_flags_read = 0, in_flags_write = 0;
+            PRInt16 out_flags_read = 0, out_flags_write = 0;
+
+            if ((NULL != pds[index].fd) && (0 != pds[index].in_flags))
+            {
+                if (pds[index].in_flags & PR_POLL_READ)
+                {
+                    in_flags_read = (pds[index].fd->methods->poll)(
+                                        pds[index].fd,
+                                        pds[index].in_flags & ~PR_POLL_WRITE,
+                                        &out_flags_read);
+                }
+                if (pds[index].in_flags & PR_POLL_WRITE)
+                {
+                    in_flags_write = (pds[index].fd->methods->poll)(
+                                         pds[index].fd,
+                                         pds[index].in_flags & ~PR_POLL_READ,
+                                         &out_flags_write);
+                }
+                if ((0 != (in_flags_read & out_flags_read))
+                    || (0 != (in_flags_write & out_flags_write)))
+                {
+                    /* this one is ready right now */
+                    if (0 == ready)
+                    {
+                        /*
+                         * We will return without calling the system
+                         * poll function.  So zero the out_flags
+                         * fields of all the poll descriptors before
+                         * this one.
+                         */
+                        int i;
+                        for (i = 0; i < index; i++)
+                        {
+                            pds[i].out_flags = 0;
+                        }
+                    }
+                    ready += 1;
+                    pds[index].out_flags = out_flags_read | out_flags_write;
+                }
+                else
+                {
+                    /* now locate the NSPR layer at the bottom of the stack */
+                    PRFileDesc *bottom = PR_GetIdentitiesLayer(
+                                             pds[index].fd, PR_NSPR_IO_LAYER);
+                    /* ignore a socket without PR_NSPR_IO_LAYER available */
+
+                    pds[index].out_flags = 0;  /* pre-condition */
+                    if ((NULL != bottom)
+                        && (_PR_FILEDESC_OPEN == bottom->secret->state))
+                    {
+                        if (0 == ready)
+                        {
+                            PRBool add_to_rd = PR_FALSE;
+                            PRBool add_to_wr = PR_FALSE;
+                            PRBool add_to_ex = PR_FALSE;
+
+                            selectfd[index] = bottom->secret->md.osfd;
+                            if (in_flags_read & PR_POLL_READ)
+                            {
+                                pds[index].out_flags |=
+                                    _PR_POLL_READ_SYS_READ;
+                                add_to_rd = PR_TRUE;
+                            }
+                            if (in_flags_read & PR_POLL_WRITE)
+                            {
+                                pds[index].out_flags |=
+                                    _PR_POLL_READ_SYS_WRITE;
+                                add_to_wr = PR_TRUE;
+                            }
+                            if (in_flags_write & PR_POLL_READ)
+                            {
+                                pds[index].out_flags |=
+                                    _PR_POLL_WRITE_SYS_READ;
+                                add_to_rd = PR_TRUE;
+                            }
+                            if (in_flags_write & PR_POLL_WRITE)
+                            {
+                                pds[index].out_flags |=
+                                    _PR_POLL_WRITE_SYS_WRITE;
+                                add_to_wr = PR_TRUE;
+                            }
+                            if (pds[index].in_flags & PR_POLL_EXCEPT)
+                            {
+                                add_to_ex = PR_TRUE;
+                            }
+                            if ((selectfd[index] > maxfd) &&
+                                (add_to_rd || add_to_wr || add_to_ex))
+                            {
+                                maxfd = selectfd[index];
+                                /*
+                                 * If maxfd is too large to be used with
+                                 * select, fall back to calling poll.
+                                 */
+                                if (maxfd >= FD_SETSIZE) {
+                                    break;
+                                }
+                            }
+                            if (add_to_rd)
+                            {
+                                FD_SET(bottom->secret->md.osfd, &rd);
+                                rdp = &rd;
+                            }
+                            if (add_to_wr)
+                            {
+                                FD_SET(bottom->secret->md.osfd, &wr);
+                                wrp = &wr;
+                            }
+                            if (add_to_ex)
+                            {
+                                FD_SET(bottom->secret->md.osfd, &ex);
+                                exp = &ex;
+                            }
+                        }
+                    }
+                    else
+                    {
+                        if (0 == ready)
+                        {
+                            int i;
+                            for (i = 0; i < index; i++)
+                            {
+                                pds[i].out_flags = 0;
+                            }
+                        }
+                        ready += 1;  /* this will cause an abrupt return */
+                        pds[index].out_flags = PR_POLL_NVAL;  /* bogii */
+                    }
+                }
+            }
+            else
+            {
+                pds[index].out_flags = 0;
+            }
+        }
+        if (0 == ready)
+        {
+            if (maxfd >= FD_SETSIZE)
+            {
+                /*
+                 * maxfd too large to be used with select, fall back to
+                 * calling poll
+                 */
+                return(_pr_poll_with_poll(pds, npds, timeout));
+            }
+            switch (timeout)
+            {
+                case PR_INTERVAL_NO_WAIT:
+                    tv.tv_sec = 0;
+                    tv.tv_usec = 0;
+                    tvp = &tv;
+                    break;
+                case PR_INTERVAL_NO_TIMEOUT:
+                    tvp = NULL;
+                    break;
+                default:
+                    msecs = PR_IntervalToMilliseconds(timeout);
+                    tv.tv_sec = msecs/PR_MSEC_PER_SEC;
+                    tv.tv_usec = (msecs % PR_MSEC_PER_SEC) * PR_USEC_PER_MSEC;
+                    tvp = &tv;
+                    start = PR_IntervalNow();
+            }
+
+retry:
+            ready = select(maxfd + 1, rdp, wrp, exp, tvp);
+            if (-1 == ready)
+            {
+                PRIntn oserror = errno;
+
+                if ((EINTR == oserror) || (EAGAIN == oserror))
+                {
+                    if (timeout == PR_INTERVAL_NO_TIMEOUT) {
+                        goto retry;
+                    }
+                    else if (timeout == PR_INTERVAL_NO_WAIT) {
+                        ready = 0;    /* don't retry, just time out */
+                    }
+                    else
+                    {
+                        elapsed = (PRIntervalTime) (PR_IntervalNow()
+                                                    - start);
+                        if (elapsed > timeout) {
+                            ready = 0;    /* timed out */
+                        }
+                        else
+                        {
+                            remaining = timeout - elapsed;
+                            msecs = PR_IntervalToMilliseconds(remaining);
+                            tv.tv_sec = msecs/PR_MSEC_PER_SEC;
+                            tv.tv_usec = (msecs % PR_MSEC_PER_SEC) *
+                                         PR_USEC_PER_MSEC;
+                            goto retry;
+                        }
+                    }
+                } else if (EBADF == oserror)
+                {
+                    /* find all the bad fds */
+                    ready = 0;
+                    for (index = 0; index < npds; ++index)
+                    {
+                        pds[index].out_flags = 0;
+                        if ((NULL != pds[index].fd) &&
+                            (0 != pds[index].in_flags))
+                        {
+                            if (fcntl(selectfd[index], F_GETFL, 0) == -1)
+                            {
+                                pds[index].out_flags = PR_POLL_NVAL;
+                                ready++;
+                            }
+                        }
+                    }
+                } else {
+                    _PR_MD_MAP_SELECT_ERROR(oserror);
+                }
+            }
+            else if (ready > 0)
+            {
+                for (index = 0; index < npds; ++index)
+                {
+                    PRInt16 out_flags = 0;
+                    if ((NULL != pds[index].fd) && (0 != pds[index].in_flags))
+                    {
+                        if (FD_ISSET(selectfd[index], &rd))
+                        {
+                            if (pds[index].out_flags
+                                & _PR_POLL_READ_SYS_READ)
+                            {
+                                out_flags |= PR_POLL_READ;
+                            }
+                            if (pds[index].out_flags
+                                & _PR_POLL_WRITE_SYS_READ)
+                            {
+                                out_flags |= PR_POLL_WRITE;
+                            }
+                        }
+                        if (FD_ISSET(selectfd[index], &wr))
+                        {
+                            if (pds[index].out_flags
+                                & _PR_POLL_READ_SYS_WRITE)
+                            {
+                                out_flags |= PR_POLL_READ;
+                            }
+                            if (pds[index].out_flags
+                                & _PR_POLL_WRITE_SYS_WRITE)
+                            {
+                                out_flags |= PR_POLL_WRITE;
+                            }
+                        }
+                        if (FD_ISSET(selectfd[index], &ex)) {
+                            out_flags |= PR_POLL_EXCEPT;
+                        }
+                    }
+                    pds[index].out_flags = out_flags;
+                }
+            }
+        }
+    }
+    return ready;
+
+} /* _pr_poll_with_select */
+#endif  /* _PR_POLL_WITH_SELECT */
+
+PR_IMPLEMENT(PRInt32) PR_Poll(
+    PRPollDesc *pds, PRIntn npds, PRIntervalTime timeout)
+{
+#if defined(_PR_POLL_WITH_SELECT)
+    return(_pr_poll_with_select(pds, npds, timeout));
+#else
+    return(_pr_poll_with_poll(pds, npds, timeout));
+#endif
+}
+
+PR_IMPLEMENT(PRDirEntry*) PR_ReadDir(PRDir *dir, PRDirFlags flags)
+{
+    struct dirent *dp;
+
+    if (pt_TestAbort()) {
+        return NULL;
+    }
+
+    for (;;)
+    {
+        errno = 0;
+        dp = readdir(dir->md.d);
+        if (NULL == dp)
+        {
+            pt_MapError(_PR_MD_MAP_READDIR_ERROR, errno);
+            return NULL;
+        }
+        if ((flags & PR_SKIP_DOT)
+            && ('.' == dp->d_name[0])
+            && (0 == dp->d_name[1])) {
+            continue;
+        }
+        if ((flags & PR_SKIP_DOT_DOT)
+            && ('.' == dp->d_name[0])
+            && ('.' == dp->d_name[1])
+            && (0 == dp->d_name[2])) {
+            continue;
+        }
+        if ((flags & PR_SKIP_HIDDEN) && ('.' == dp->d_name[0])) {
+            continue;
+        }
+        break;
+    }
+    dir->d.name = dp->d_name;
+    return &dir->d;
+}  /* PR_ReadDir */
+
+PR_IMPLEMENT(PRFileDesc*) PR_NewUDPSocket(void)
+{
+    PRIntn domain = PF_INET;
+
+    return PR_Socket(domain, SOCK_DGRAM, 0);
+}  /* PR_NewUDPSocket */
+
+PR_IMPLEMENT(PRFileDesc*) PR_NewTCPSocket(void)
+{
+    PRIntn domain = PF_INET;
+
+    return PR_Socket(domain, SOCK_STREAM, 0);
+}  /* PR_NewTCPSocket */
+
+PR_IMPLEMENT(PRFileDesc*) PR_OpenUDPSocket(PRIntn af)
+{
+    return PR_Socket(af, SOCK_DGRAM, 0);
+}  /* PR_NewUDPSocket */
+
+PR_IMPLEMENT(PRFileDesc*) PR_OpenTCPSocket(PRIntn af)
+{
+    return PR_Socket(af, SOCK_STREAM, 0);
+}  /* PR_NewTCPSocket */
+
+PR_IMPLEMENT(PRStatus) PR_NewTCPSocketPair(PRFileDesc *fds[2])
+{
+    PRInt32 osfd[2];
+
+    if (pt_TestAbort()) {
+        return PR_FAILURE;
+    }
+
+    if (socketpair(AF_UNIX, SOCK_STREAM, 0, osfd) == -1) {
+        pt_MapError(_PR_MD_MAP_SOCKETPAIR_ERROR, errno);
+        return PR_FAILURE;
+    }
+
+    fds[0] = pt_SetMethods(osfd[0], PR_DESC_SOCKET_TCP, PR_FALSE, PR_FALSE);
+    if (fds[0] == NULL) {
+        close(osfd[0]);
+        close(osfd[1]);
+        return PR_FAILURE;
+    }
+    fds[1] = pt_SetMethods(osfd[1], PR_DESC_SOCKET_TCP, PR_FALSE, PR_FALSE);
+    if (fds[1] == NULL) {
+        PR_Close(fds[0]);
+        close(osfd[1]);
+        return PR_FAILURE;
+    }
+    return PR_SUCCESS;
+}  /* PR_NewTCPSocketPair */
+
+PR_IMPLEMENT(PRStatus) PR_CreatePipe(
+    PRFileDesc **readPipe,
+    PRFileDesc **writePipe
+)
+{
+    int pipefd[2];
+
+    if (pt_TestAbort()) {
+        return PR_FAILURE;
+    }
+
+    if (pipe(pipefd) == -1)
+    {
+        /* XXX map pipe error */
+        PR_SetError(PR_UNKNOWN_ERROR, errno);
+        return PR_FAILURE;
+    }
+    *readPipe = pt_SetMethods(pipefd[0], PR_DESC_PIPE, PR_FALSE, PR_FALSE);
+    if (NULL == *readPipe)
+    {
+        close(pipefd[0]);
+        close(pipefd[1]);
+        return PR_FAILURE;
+    }
+    *writePipe = pt_SetMethods(pipefd[1], PR_DESC_PIPE, PR_FALSE, PR_FALSE);
+    if (NULL == *writePipe)
+    {
+        PR_Close(*readPipe);
+        close(pipefd[1]);
+        return PR_FAILURE;
+    }
+    return PR_SUCCESS;
+}
+
+/*
+** Set the inheritance attribute of a file descriptor.
+*/
+PR_IMPLEMENT(PRStatus) PR_SetFDInheritable(
+    PRFileDesc *fd,
+    PRBool inheritable)
+{
+    /*
+     * Only a non-layered, NSPR file descriptor can be inherited
+     * by a child process.
+     */
+    if (fd->identity != PR_NSPR_IO_LAYER)
+    {
+        PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+        return PR_FAILURE;
+    }
+    if (fd->secret->inheritable != inheritable)
+    {
+        if (fcntl(fd->secret->md.osfd, F_SETFD,
+                  inheritable ? 0 : FD_CLOEXEC) == -1)
+        {
+            _PR_MD_MAP_DEFAULT_ERROR(errno);
+            return PR_FAILURE;
+        }
+        fd->secret->inheritable = (_PRTriStateBool) inheritable;
+    }
+    return PR_SUCCESS;
+}
+
+/*****************************************************************************/
+/***************************** I/O friends methods ***************************/
+/*****************************************************************************/
+
+PR_IMPLEMENT(PRFileDesc*) PR_ImportFile(PRInt32 osfd)
+{
+    PRFileDesc *fd;
+
+    if (!_pr_initialized) {
+        _PR_ImplicitInitialization();
+    }
+    fd = pt_SetMethods(osfd, PR_DESC_FILE, PR_FALSE, PR_TRUE);
+    if (NULL == fd) {
+        close(osfd);
+    }
+    return fd;
+}  /* PR_ImportFile */
+
+PR_IMPLEMENT(PRFileDesc*) PR_ImportPipe(PRInt32 osfd)
+{
+    PRFileDesc *fd;
+
+    if (!_pr_initialized) {
+        _PR_ImplicitInitialization();
+    }
+    fd = pt_SetMethods(osfd, PR_DESC_PIPE, PR_FALSE, PR_TRUE);
+    if (NULL == fd) {
+        close(osfd);
+    }
+    return fd;
+}  /* PR_ImportPipe */
+
+PR_IMPLEMENT(PRFileDesc*) PR_ImportTCPSocket(PRInt32 osfd)
+{
+    PRFileDesc *fd;
+
+    if (!_pr_initialized) {
+        _PR_ImplicitInitialization();
+    }
+    fd = pt_SetMethods(osfd, PR_DESC_SOCKET_TCP, PR_FALSE, PR_TRUE);
+    if (NULL == fd) {
+        close(osfd);
+    }
+#ifdef _PR_NEED_SECRET_AF
+    if (NULL != fd) {
+        fd->secret->af = PF_INET;
+    }
+#endif
+    return fd;
+}  /* PR_ImportTCPSocket */
+
+PR_IMPLEMENT(PRFileDesc*) PR_ImportUDPSocket(PRInt32 osfd)
+{
+    PRFileDesc *fd;
+
+    if (!_pr_initialized) {
+        _PR_ImplicitInitialization();
+    }
+    fd = pt_SetMethods(osfd, PR_DESC_SOCKET_UDP, PR_FALSE, PR_TRUE);
+    if (NULL == fd) {
+        close(osfd);
+    }
+    return fd;
+}  /* PR_ImportUDPSocket */
+
+PR_IMPLEMENT(PRFileDesc*) PR_CreateSocketPollFd(PRInt32 osfd)
+{
+    PRFileDesc *fd;
+
+    if (!_pr_initialized) {
+        _PR_ImplicitInitialization();
+    }
+
+    fd = _PR_Getfd();
+
+    if (fd == NULL) {
+        PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+    }
+    else
+    {
+        fd->secret->md.osfd = osfd;
+        fd->secret->inheritable = _PR_TRI_FALSE;
+        fd->secret->state = _PR_FILEDESC_OPEN;
+        fd->methods = PR_GetSocketPollFdMethods();
+    }
+
+    return fd;
+}  /* PR_CreateSocketPollFD */
+
+PR_IMPLEMENT(PRStatus) PR_DestroySocketPollFd(PRFileDesc *fd)
+{
+    if (NULL == fd)
+    {
+        PR_SetError(PR_BAD_DESCRIPTOR_ERROR, 0);
+        return PR_FAILURE;
+    }
+    fd->secret->state = _PR_FILEDESC_CLOSED;
+    _PR_Putfd(fd);
+    return PR_SUCCESS;
+}  /* PR_DestroySocketPollFd */
+
+PR_IMPLEMENT(PRInt32) PR_FileDesc2NativeHandle(PRFileDesc *bottom)
+{
+    PRInt32 osfd = -1;
+    bottom = (NULL == bottom) ?
+             NULL : PR_GetIdentitiesLayer(bottom, PR_NSPR_IO_LAYER);
+    if (NULL == bottom) {
+        PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+    }
+    else {
+        osfd = bottom->secret->md.osfd;
+    }
+    return osfd;
+}  /* PR_FileDesc2NativeHandle */
+
+PR_IMPLEMENT(void) PR_ChangeFileDescNativeHandle(PRFileDesc *fd,
+        PRInt32 handle)
+{
+    if (fd) {
+        fd->secret->md.osfd = handle;
+    }
+}  /*  PR_ChangeFileDescNativeHandle*/
+
+PR_IMPLEMENT(PRStatus) PR_LockFile(PRFileDesc *fd)
+{
+    PRStatus status = PR_SUCCESS;
+
+    if (pt_TestAbort()) {
+        return PR_FAILURE;
+    }
+
+    PR_Lock(_pr_flock_lock);
+    while (-1 == fd->secret->lockCount) {
+        PR_WaitCondVar(_pr_flock_cv, PR_INTERVAL_NO_TIMEOUT);
+    }
+    if (0 == fd->secret->lockCount)
+    {
+        fd->secret->lockCount = -1;
+        PR_Unlock(_pr_flock_lock);
+        status = _PR_MD_LOCKFILE(fd->secret->md.osfd);
+        PR_Lock(_pr_flock_lock);
+        fd->secret->lockCount = (PR_SUCCESS == status) ? 1 : 0;
+        PR_NotifyAllCondVar(_pr_flock_cv);
+    }
+    else
+    {
+        fd->secret->lockCount += 1;
+    }
+    PR_Unlock(_pr_flock_lock);
+
+    return status;
+}  /* PR_LockFile */
+
+PR_IMPLEMENT(PRStatus) PR_TLockFile(PRFileDesc *fd)
+{
+    PRStatus status = PR_SUCCESS;
+
+    if (pt_TestAbort()) {
+        return PR_FAILURE;
+    }
+
+    PR_Lock(_pr_flock_lock);
+    if (0 == fd->secret->lockCount)
+    {
+        status = _PR_MD_TLOCKFILE(fd->secret->md.osfd);
+        if (PR_SUCCESS == status) {
+            fd->secret->lockCount = 1;
+        }
+    }
+    else {
+        fd->secret->lockCount += 1;
+    }
+    PR_Unlock(_pr_flock_lock);
+
+    return status;
+}  /* PR_TLockFile */
+
+PR_IMPLEMENT(PRStatus) PR_UnlockFile(PRFileDesc *fd)
+{
+    PRStatus status = PR_SUCCESS;
+
+    if (pt_TestAbort()) {
+        return PR_FAILURE;
+    }
+
+    PR_Lock(_pr_flock_lock);
+    if (fd->secret->lockCount == 1)
+    {
+        status = _PR_MD_UNLOCKFILE(fd->secret->md.osfd);
+        if (PR_SUCCESS == status) {
+            fd->secret->lockCount = 0;
+        }
+    }
+    else {
+        fd->secret->lockCount -= 1;
+    }
+    PR_Unlock(_pr_flock_lock);
+
+    return status;
+}
+
+/*
+ * The next two entry points should not be in the API, but they are
+ * defined here for historical (or hysterical) reasons.
+ */
+
+PR_IMPLEMENT(PRInt32) PR_GetSysfdTableMax(void)
+{
+#if defined(AIX)
+    return sysconf(_SC_OPEN_MAX);
+#else
+    struct rlimit rlim;
+
+    if ( getrlimit(RLIMIT_NOFILE, &rlim) < 0) {
+        return -1;
+    }
+
+    return rlim.rlim_max;
+#endif
+}
+
+PR_IMPLEMENT(PRInt32) PR_SetSysfdTableSize(PRIntn table_size)
+{
+#if defined(AIX)
+    return -1;
+#else
+    struct rlimit rlim;
+    PRInt32 tableMax = PR_GetSysfdTableMax();
+
+    if (tableMax < 0) {
+        return -1;
+    }
+    rlim.rlim_max = tableMax;
+
+    /* Grow as much as we can; even if too big */
+    if ( rlim.rlim_max < table_size ) {
+        rlim.rlim_cur = rlim.rlim_max;
+    }
+    else {
+        rlim.rlim_cur = table_size;
+    }
+
+    if ( setrlimit(RLIMIT_NOFILE, &rlim) < 0) {
+        return -1;
+    }
+
+    return rlim.rlim_cur;
+#endif
+}
+
+/*
+ * PR_Stat is supported for backward compatibility; some existing Java
+ * code uses it.  New code should use PR_GetFileInfo.
+ */
+
+#ifndef NO_NSPR_10_SUPPORT
+PR_IMPLEMENT(PRInt32) PR_Stat(const char *name, struct stat *buf)
+{
+    static PRBool unwarned = PR_TRUE;
+    if (unwarned) {
+        unwarned = _PR_Obsolete("PR_Stat", "PR_GetFileInfo");
+    }
+
+    if (pt_TestAbort()) {
+        return -1;
+    }
+
+    if (-1 == stat(name, buf)) {
+        pt_MapError(_PR_MD_MAP_STAT_ERROR, errno);
+        return -1;
+    } else {
+        return 0;
+    }
+}
+#endif /* ! NO_NSPR_10_SUPPORT */
+
+
+PR_IMPLEMENT(void) PR_FD_ZERO(PR_fd_set *set)
+{
+    static PRBool unwarned = PR_TRUE;
+    if (unwarned) {
+        unwarned = _PR_Obsolete("PR_FD_ZERO (PR_Select)", "PR_Poll");
+    }
+    memset(set, 0, sizeof(PR_fd_set));
+}
+
+PR_IMPLEMENT(void) PR_FD_SET(PRFileDesc *fh, PR_fd_set *set)
+{
+    static PRBool unwarned = PR_TRUE;
+    if (unwarned) {
+        unwarned = _PR_Obsolete("PR_FD_SET (PR_Select)", "PR_Poll");
+    }
+    PR_ASSERT( set->hsize < PR_MAX_SELECT_DESC );
+
+    set->harray[set->hsize++] = fh;
+}
+
+PR_IMPLEMENT(void) PR_FD_CLR(PRFileDesc *fh, PR_fd_set *set)
+{
+    PRUint32 index, index2;
+    static PRBool unwarned = PR_TRUE;
+    if (unwarned) {
+        unwarned = _PR_Obsolete("PR_FD_CLR (PR_Select)", "PR_Poll");
+    }
+
+    for (index = 0; index<set->hsize; index++)
+        if (set->harray[index] == fh) {
+            for (index2=index; index2 < (set->hsize-1); index2++) {
+                set->harray[index2] = set->harray[index2+1];
+            }
+            set->hsize--;
+            break;
+        }
+}
+
+PR_IMPLEMENT(PRInt32) PR_FD_ISSET(PRFileDesc *fh, PR_fd_set *set)
+{
+    PRUint32 index;
+    static PRBool unwarned = PR_TRUE;
+    if (unwarned) {
+        unwarned = _PR_Obsolete("PR_FD_ISSET (PR_Select)", "PR_Poll");
+    }
+    for (index = 0; index<set->hsize; index++)
+        if (set->harray[index] == fh) {
+            return 1;
+        }
+    return 0;
+}
+
+PR_IMPLEMENT(void) PR_FD_NSET(PRInt32 fd, PR_fd_set *set)
+{
+    static PRBool unwarned = PR_TRUE;
+    if (unwarned) {
+        unwarned = _PR_Obsolete("PR_FD_NSET (PR_Select)", "PR_Poll");
+    }
+    PR_ASSERT( set->nsize < PR_MAX_SELECT_DESC );
+
+    set->narray[set->nsize++] = fd;
+}
+
+PR_IMPLEMENT(void) PR_FD_NCLR(PRInt32 fd, PR_fd_set *set)
+{
+    PRUint32 index, index2;
+    static PRBool unwarned = PR_TRUE;
+    if (unwarned) {
+        unwarned = _PR_Obsolete("PR_FD_NCLR (PR_Select)", "PR_Poll");
+    }
+
+    for (index = 0; index<set->nsize; index++)
+        if (set->narray[index] == fd) {
+            for (index2=index; index2 < (set->nsize-1); index2++) {
+                set->narray[index2] = set->narray[index2+1];
+            }
+            set->nsize--;
+            break;
+        }
+}
+
+PR_IMPLEMENT(PRInt32) PR_FD_NISSET(PRInt32 fd, PR_fd_set *set)
+{
+    PRUint32 index;
+    static PRBool unwarned = PR_TRUE;
+    if (unwarned) {
+        unwarned = _PR_Obsolete("PR_FD_NISSET (PR_Select)", "PR_Poll");
+    }
+    for (index = 0; index<set->nsize; index++)
+        if (set->narray[index] == fd) {
+            return 1;
+        }
+    return 0;
+}
+
+#include <sys/types.h>
+#include <sys/time.h>
+#if !defined(HPUX) \
+    && !defined(LINUX) && !defined(__GNU__) && !defined(__GLIBC__)
+#include <sys/select.h>
+#endif
+
+static PRInt32
+_PR_getset(PR_fd_set *pr_set, fd_set *set)
+{
+    PRUint32 index;
+    PRInt32 max = 0;
+
+    if (!pr_set) {
+        return 0;
+    }
+
+    FD_ZERO(set);
+
+    /* First set the pr file handle osfds */
+    for (index=0; index<pr_set->hsize; index++) {
+        FD_SET(pr_set->harray[index]->secret->md.osfd, set);
+        if (pr_set->harray[index]->secret->md.osfd > max) {
+            max = pr_set->harray[index]->secret->md.osfd;
+        }
+    }
+    /* Second set the native osfds */
+    for (index=0; index<pr_set->nsize; index++) {
+        FD_SET(pr_set->narray[index], set);
+        if (pr_set->narray[index] > max) {
+            max = pr_set->narray[index];
+        }
+    }
+    return max;
+}
+
+static void
+_PR_setset(PR_fd_set *pr_set, fd_set *set)
+{
+    PRUint32 index, last_used;
+
+    if (!pr_set) {
+        return;
+    }
+
+    for (last_used=0, index=0; index<pr_set->hsize; index++) {
+        if ( FD_ISSET(pr_set->harray[index]->secret->md.osfd, set) ) {
+            pr_set->harray[last_used++] = pr_set->harray[index];
+        }
+    }
+    pr_set->hsize = last_used;
+
+    for (last_used=0, index=0; index<pr_set->nsize; index++) {
+        if ( FD_ISSET(pr_set->narray[index], set) ) {
+            pr_set->narray[last_used++] = pr_set->narray[index];
+        }
+    }
+    pr_set->nsize = last_used;
+}
+
+PR_IMPLEMENT(PRInt32) PR_Select(
+    PRInt32 unused, PR_fd_set *pr_rd, PR_fd_set *pr_wr,
+    PR_fd_set *pr_ex, PRIntervalTime timeout)
+{
+    fd_set rd, wr, ex;
+    struct timeval tv, *tvp;
+    PRInt32 max, max_fd;
+    PRInt32 rv;
+    /*
+     * For restarting select() if it is interrupted by a Unix signal.
+     * We use these variables to figure out how much time has elapsed
+     * and how much of the timeout still remains.
+     */
+    PRIntervalTime start = 0, elapsed, remaining;
+
+    static PRBool unwarned = PR_TRUE;
+    if (unwarned) {
+        unwarned = _PR_Obsolete( "PR_Select", "PR_Poll");
+    }
+
+    FD_ZERO(&rd);
+    FD_ZERO(&wr);
+    FD_ZERO(&ex);
+
+    max_fd = _PR_getset(pr_rd, &rd);
+    max_fd = (max = _PR_getset(pr_wr, &wr))>max_fd?max:max_fd;
+    max_fd = (max = _PR_getset(pr_ex, &ex))>max_fd?max:max_fd;
+
+    if (timeout == PR_INTERVAL_NO_TIMEOUT) {
+        tvp = NULL;
+    } else {
+        tv.tv_sec = (PRInt32)PR_IntervalToSeconds(timeout);
+        tv.tv_usec = (PRInt32)PR_IntervalToMicroseconds(
+                         timeout - PR_SecondsToInterval(tv.tv_sec));
+        tvp = &tv;
+        start = PR_IntervalNow();
+    }
+
+retry:
+    rv = select(max_fd + 1, (_PRSelectFdSetArg_t) &rd,
+                (_PRSelectFdSetArg_t) &wr, (_PRSelectFdSetArg_t) &ex, tvp);
+
+    if (rv == -1 && errno == EINTR) {
+        if (timeout == PR_INTERVAL_NO_TIMEOUT) {
+            goto retry;
+        } else {
+            elapsed = (PRIntervalTime) (PR_IntervalNow() - start);
+            if (elapsed > timeout) {
+                rv = 0;  /* timed out */
+            } else {
+                remaining = timeout - elapsed;
+                tv.tv_sec = (PRInt32)PR_IntervalToSeconds(remaining);
+                tv.tv_usec = (PRInt32)PR_IntervalToMicroseconds(
+                                 remaining - PR_SecondsToInterval(tv.tv_sec));
+                goto retry;
+            }
+        }
+    }
+
+    if (rv > 0) {
+        _PR_setset(pr_rd, &rd);
+        _PR_setset(pr_wr, &wr);
+        _PR_setset(pr_ex, &ex);
+    } else if (rv == -1) {
+        pt_MapError(_PR_MD_MAP_SELECT_ERROR, errno);
+    }
+    return rv;
+}
+#endif /* defined(_PR_PTHREADS) */
+
+#ifdef MOZ_UNICODE
+/* ================ UTF16 Interfaces ================================ */
+PR_IMPLEMENT(PRFileDesc*) PR_OpenFileUTF16(
+    const PRUnichar *name, PRIntn flags, PRIntn mode)
+{
+    PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
+    return NULL;
+}
+
+PR_IMPLEMENT(PRStatus) PR_CloseDirUTF16(PRDir *dir)
+{
+    PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
+    return PR_FAILURE;
+}
+
+PR_IMPLEMENT(PRDirUTF16*) PR_OpenDirUTF16(const PRUnichar *name)
+{
+    PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
+    return NULL;
+}
+
+PR_IMPLEMENT(PRDirEntryUTF16*) PR_ReadDirUTF16(PRDirUTF16 *dir, PRDirFlags flags)
+{
+    PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
+    return NULL;
+}
+
+PR_IMPLEMENT(PRStatus) PR_GetFileInfo64UTF16(const PRUnichar *fn, PRFileInfo64 *info)
+{
+    PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
+    return PR_FAILURE;
+}
+/* ================ UTF16 Interfaces ================================ */
+#endif /* MOZ_UNICODE */
+
+/* ptio.c */