1 files changed, 2865 insertions, 0 deletions

diff --git a/utils/start-stop-daemon.c b/utils/start-stop-daemon.c
new file mode 100644
index 0000000..88c9726
--- /dev/null
+++ b/utils/start-stop-daemon.c
@@ -0,0 +1,2865 @@
+/*
+ * A rewrite of the original Debian's start-stop-daemon Perl script
+ * in C (faster - it is executed many times during system startup).
+ *
+ * Written by Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>,
+ * public domain.  Based conceptually on start-stop-daemon.pl, by Ian
+ * Jackson <ijackson@gnu.ai.mit.edu>.  May be used and distributed
+ * freely for any purpose.  Changes by Christian Schwarz
+ * <schwarz@monet.m.isar.de>, to make output conform to the Debian
+ * Console Message Standard, also placed in public domain.  Minor
+ * changes by Klee Dienes <klee@debian.org>, also placed in the Public
+ * Domain.
+ *
+ * Changes by Ben Collins <bcollins@debian.org>, added --chuid, --background
+ * and --make-pidfile options, placed in public domain as well.
+ *
+ * Port to OpenBSD by Sontri Tomo Huynh <huynh.29@osu.edu>
+ *                 and Andreas Schuldei <andreas@schuldei.org>
+ *
+ * Changes by Ian Jackson: added --retry (and associated rearrangements).
+ */
+
+#include <config.h>
+#include <compat.h>
+
+#include <dpkg/macros.h>
+
+#if defined(__linux__)
+#  define OS_Linux
+#elif defined(__GNU__)
+#  define OS_Hurd
+#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
+#  define OS_FreeBSD
+#elif defined(__NetBSD__)
+#  define OS_NetBSD
+#elif defined(__OpenBSD__)
+#  define OS_OpenBSD
+#elif defined(__DragonFly__)
+#  define OS_DragonFlyBSD
+#elif defined(__APPLE__) && defined(__MACH__)
+#  define OS_Darwin
+#elif defined(__sun)
+#  define OS_Solaris
+#elif defined(_AIX)
+#  define OS_AIX
+#elif defined(__hpux)
+#  define OS_HPUX
+#else
+#  error Unknown architecture - cannot build start-stop-daemon
+#endif
+
+/* NetBSD needs this to expose struct proc. */
+#define _KMEMUSER 1
+
+#ifdef HAVE_SYS_PARAM_H
+#include <sys/param.h>
+#endif
+#ifdef HAVE_SYS_SYSCALL_H
+#include <sys/syscall.h>
+#endif
+#ifdef HAVE_SYS_SYSCTL_H
+#include <sys/sysctl.h>
+#endif
+#ifdef HAVE_SYS_PROCFS_H
+#include <sys/procfs.h>
+#endif
+#ifdef HAVE_SYS_PROC_H
+#include <sys/proc.h>
+#endif
+#ifdef HAVE_SYS_USER_H
+#include <sys/user.h>
+#endif
+#ifdef HAVE_SYS_PSTAT_H
+#include <sys/pstat.h>
+#endif
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <sys/select.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+
+#include <errno.h>
+#include <limits.h>
+#include <time.h>
+#include <fcntl.h>
+#include <dirent.h>
+#include <ctype.h>
+#include <string.h>
+#include <pwd.h>
+#include <grp.h>
+#include <signal.h>
+#include <termios.h>
+#include <unistd.h>
+#ifdef HAVE_STDDEF_H
+#include <stddef.h>
+#endif
+#include <stdbool.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <getopt.h>
+#ifdef HAVE_ERROR_H
+#include <error.h>
+#endif
+#ifdef HAVE_ERR_H
+#include <err.h>
+#endif
+
+#if defined(OS_Hurd)
+#include <hurd.h>
+#include <ps.h>
+#endif
+
+#if defined(OS_Darwin)
+#include <libproc.h>
+#endif
+
+#ifdef HAVE_KVM_H
+#include <kvm.h>
+#if defined(OS_FreeBSD)
+#define KVM_MEMFILE "/dev/null"
+#else
+#define KVM_MEMFILE NULL
+#endif
+#endif
+
+#if defined(_POSIX_PRIORITY_SCHEDULING) && _POSIX_PRIORITY_SCHEDULING > 0
+#include <sched.h>
+#else
+#define SCHED_OTHER -1
+#define SCHED_FIFO -1
+#define SCHED_RR -1
+#endif
+
+#if defined(OS_Linux)
+/* This comes from TASK_COMM_LEN defined in Linux' include/linux/sched.h. */
+#define PROCESS_NAME_SIZE 15
+#elif defined(OS_Solaris)
+#define PROCESS_NAME_SIZE 15
+#elif defined(OS_Darwin)
+#define PROCESS_NAME_SIZE 16
+#elif defined(OS_AIX)
+/* This comes from PRFNSZ defined in AIX's <sys/procfs.h>. */
+#define PROCESS_NAME_SIZE 16
+#elif defined(OS_NetBSD)
+#define PROCESS_NAME_SIZE 16
+#elif defined(OS_OpenBSD)
+#define PROCESS_NAME_SIZE 16
+#elif defined(OS_FreeBSD)
+#define PROCESS_NAME_SIZE 19
+#elif defined(OS_DragonFlyBSD)
+/* On DragonFlyBSD MAXCOMLEN expands to 16. */
+#define PROCESS_NAME_SIZE MAXCOMLEN
+#endif
+
+#if defined(SYS_ioprio_set) && defined(linux)
+#define HAVE_IOPRIO_SET
+#endif
+
+#define IOPRIO_CLASS_SHIFT 13
+#define IOPRIO_PRIO_VALUE(class, prio) (((class) << IOPRIO_CLASS_SHIFT) | (prio))
+#define IO_SCHED_PRIO_MIN 0
+#define IO_SCHED_PRIO_MAX 7
+
+enum {
+	IOPRIO_WHO_PROCESS = 1,
+	IOPRIO_WHO_PGRP,
+	IOPRIO_WHO_USER,
+};
+
+enum {
+	IOPRIO_CLASS_NONE,
+	IOPRIO_CLASS_RT,
+	IOPRIO_CLASS_BE,
+	IOPRIO_CLASS_IDLE,
+};
+
+enum action_code {
+	ACTION_NONE,
+	ACTION_START,
+	ACTION_STOP,
+	ACTION_STATUS,
+};
+
+enum match_code {
+	MATCH_NONE	= 0,
+	MATCH_PID	= 1 << 0,
+	MATCH_PPID	= 1 << 1,
+	MATCH_PIDFILE	= 1 << 2,
+	MATCH_EXEC	= 1 << 3,
+	MATCH_NAME	= 1 << 4,
+	MATCH_USER	= 1 << 5,
+};
+
+/* Time conversion constants. */
+enum {
+	NANOSEC_IN_SEC      = 1000000000L,
+	NANOSEC_IN_MILLISEC = 1000000L,
+	NANOSEC_IN_MICROSEC = 1000L,
+};
+
+/* The minimum polling interval, 20ms. */
+static const long MIN_POLL_INTERVAL = 20L * NANOSEC_IN_MILLISEC;
+
+static enum action_code action;
+static enum match_code match_mode;
+static bool testmode = false;
+static int quietmode = 0;
+static int exitnodo = 1;
+static bool background = false;
+static bool close_io = true;
+static bool notify_await = false;
+static int notify_timeout = 60;
+static char *notify_sockdir;
+static char *notify_socket;
+static bool mpidfile = false;
+static bool rpidfile = false;
+static int signal_nr = SIGTERM;
+static int user_id = -1;
+static int runas_uid = -1;
+static int runas_gid = -1;
+static const char *userspec = NULL;
+static char *changeuser = NULL;
+static const char *changegroup = NULL;
+static char *changeroot = NULL;
+static const char *changedir = "/";
+static const char *cmdname = NULL;
+static char *execname = NULL;
+static char *startas = NULL;
+static pid_t match_pid = -1;
+static pid_t match_ppid = -1;
+static const char *pidfile = NULL;
+static char *what_stop = NULL;
+static const char *progname = "";
+static int nicelevel = 0;
+static int umask_value = -1;
+
+static struct stat exec_stat;
+#if defined(OS_Hurd)
+static struct proc_stat_list *procset = NULL;
+#endif
+
+/* LSB Init Script process status exit codes. */
+enum status_code {
+	STATUS_OK = 0,
+	STATUS_DEAD_PIDFILE = 1,
+	STATUS_DEAD_LOCKFILE = 2,
+	STATUS_DEAD = 3,
+	STATUS_UNKNOWN = 4,
+};
+
+struct pid_list {
+	struct pid_list *next;
+	pid_t pid;
+};
+
+static struct pid_list *found = NULL;
+static struct pid_list *killed = NULL;
+
+/* Resource scheduling policy. */
+struct res_schedule {
+	const char *policy_name;
+	int policy;
+	int priority;
+};
+
+struct schedule_item {
+	enum {
+		sched_timeout,
+		sched_signal,
+		sched_goto,
+		/* Only seen within parse_schedule and callees. */
+		sched_forever,
+	} type;
+	/* Seconds, signal no., or index into array. */
+	int value;
+};
+
+static struct res_schedule *proc_sched = NULL;
+static struct res_schedule *io_sched = NULL;
+
+static int schedule_length;
+static struct schedule_item *schedule = NULL;
+
+
+static void DPKG_ATTR_PRINTF(1)
+debug(const char *format, ...)
+{
+	va_list arglist;
+
+	if (quietmode >= 0)
+		return;
+
+	va_start(arglist, format);
+	vprintf(format, arglist);
+	va_end(arglist);
+}
+
+static void DPKG_ATTR_PRINTF(1)
+info(const char *format, ...)
+{
+	va_list arglist;
+
+	if (quietmode > 0)
+		return;
+
+	va_start(arglist, format);
+	vprintf(format, arglist);
+	va_end(arglist);
+}
+
+static void DPKG_ATTR_PRINTF(1)
+warning(const char *format, ...)
+{
+	va_list arglist;
+
+	fprintf(stderr, "%s: warning: ", progname);
+	va_start(arglist, format);
+	vfprintf(stderr, format, arglist);
+	va_end(arglist);
+}
+
+static void DPKG_ATTR_NORET DPKG_ATTR_VPRINTF(2)
+fatalv(int errno_fatal, const char *format, va_list args)
+{
+	va_list args_copy;
+
+	fprintf(stderr, "%s: ", progname);
+	va_copy(args_copy, args);
+	vfprintf(stderr, format, args_copy);
+	va_end(args_copy);
+	if (errno_fatal)
+		fprintf(stderr, " (%s)\n", strerror(errno_fatal));
+	else
+		fprintf(stderr, "\n");
+
+	if (action == ACTION_STATUS)
+		exit(STATUS_UNKNOWN);
+	else
+		exit(2);
+}
+
+static void DPKG_ATTR_NORET DPKG_ATTR_PRINTF(1)
+fatal(const char *format, ...)
+{
+	va_list args;
+
+	va_start(args, format);
+	fatalv(0, format, args);
+}
+
+static void DPKG_ATTR_NORET DPKG_ATTR_PRINTF(1)
+fatale(const char *format, ...)
+{
+	va_list args;
+
+	va_start(args, format);
+	fatalv(errno, format, args);
+}
+
+#define BUG(...) bug(__FILE__, __LINE__, __func__, __VA_ARGS__)
+
+static void DPKG_ATTR_NORET DPKG_ATTR_PRINTF(4)
+bug(const char *file, int line, const char *func, const char *format, ...)
+{
+	va_list arglist;
+
+	fprintf(stderr, "%s:%s:%d:%s: internal error: ",
+	        progname, file, line, func);
+	va_start(arglist, format);
+	vfprintf(stderr, format, arglist);
+	va_end(arglist);
+
+	if (action == ACTION_STATUS)
+		exit(STATUS_UNKNOWN);
+	else
+		exit(3);
+}
+
+static void *
+xmalloc(int size)
+{
+	void *ptr;
+
+	ptr = malloc(size);
+	if (ptr)
+		return ptr;
+	fatale("malloc(%d) failed", size);
+}
+
+static char *
+xstrndup(const char *str, size_t n)
+{
+	char *new_str;
+
+	new_str = strndup(str, n);
+	if (new_str)
+		return new_str;
+	fatale("strndup(%s, %zu) failed", str, n);
+}
+
+static void
+timespec_gettime(struct timespec *ts)
+{
+#if defined(_POSIX_TIMERS) && _POSIX_TIMERS > 0 && \
+    defined(_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK > 0
+	if (clock_gettime(CLOCK_MONOTONIC, ts) < 0)
+		fatale("clock_gettime failed");
+#else
+	struct timeval tv;
+
+	if (gettimeofday(&tv, NULL) != 0)
+		fatale("gettimeofday failed");
+
+	ts->tv_sec = tv.tv_sec;
+	ts->tv_nsec = tv.tv_usec * NANOSEC_IN_MICROSEC;
+#endif
+}
+
+#define timespec_cmp(a, b, OP) \
+	(((a)->tv_sec == (b)->tv_sec) ? \
+	 ((a)->tv_nsec OP (b)->tv_nsec) : \
+	 ((a)->tv_sec OP (b)->tv_sec))
+
+static void
+timespec_sub(struct timespec *a, struct timespec *b, struct timespec *res)
+{
+	res->tv_sec = a->tv_sec - b->tv_sec;
+	res->tv_nsec = a->tv_nsec - b->tv_nsec;
+	if (res->tv_nsec < 0) {
+		res->tv_sec--;
+		res->tv_nsec += NANOSEC_IN_SEC;
+	}
+}
+
+static void
+timespec_mul(struct timespec *a, int b)
+{
+	long nsec = a->tv_nsec * b;
+
+	a->tv_sec *= b;
+	a->tv_sec += nsec / NANOSEC_IN_SEC;
+	a->tv_nsec = nsec % NANOSEC_IN_SEC;
+}
+
+static char *
+newpath(const char *dirname, const char *filename)
+{
+	char *path;
+	size_t path_len;
+
+	path_len = strlen(dirname) + 1 + strlen(filename) + 1;
+	path = xmalloc(path_len);
+	snprintf(path, path_len, "%s/%s", dirname, filename);
+
+	return path;
+}
+
+static int
+parse_unsigned(const char *string, int base, int *value_r)
+{
+	long value;
+	char *endptr;
+
+	errno = 0;
+	if (!string[0])
+		return -1;
+
+	value = strtol(string, &endptr, base);
+	if (string == endptr || *endptr != '\0' || errno != 0)
+		return -1;
+	if (value < 0 || value > INT_MAX)
+		return -1;
+
+	*value_r = value;
+	return 0;
+}
+
+static long
+get_open_fd_max(void)
+{
+#ifdef HAVE_GETDTABLESIZE
+	return getdtablesize();
+#else
+	return sysconf(_SC_OPEN_MAX);
+#endif
+}
+
+#ifndef HAVE_SETSID
+static void
+detach_controlling_tty(void)
+{
+#ifdef HAVE_TIOCNOTTY
+	int tty_fd;
+
+	tty_fd = open("/dev/tty", O_RDWR);
+
+	/* The current process does not have a controlling tty. */
+	if (tty_fd < 0)
+		return;
+
+	if (ioctl(tty_fd, TIOCNOTTY, 0) != 0)
+		fatale("unable to detach controlling tty");
+
+	close(tty_fd);
+#endif
+}
+
+static pid_t
+setsid(void)
+{
+	if (setpgid(0, 0) < 0)
+		return -1:
+
+	detach_controlling_tty();
+
+	return 0;
+}
+#endif
+
+static void
+wait_for_child(pid_t pid)
+{
+	pid_t child;
+	int status;
+
+	do {
+		child = waitpid(pid, &status, 0);
+	} while (child == -1 && errno == EINTR);
+
+	if (child != pid)
+		fatal("error waiting for child");
+
+	if (WIFEXITED(status)) {
+		int ret = WEXITSTATUS(status);
+
+		if (ret != 0)
+			fatal("child returned error exit status %d", ret);
+	} else if (WIFSIGNALED(status)) {
+		int signo = WTERMSIG(status);
+
+		fatal("child was killed by signal %d", signo);
+	} else {
+		fatal("unexpected status %d waiting for child", status);
+	}
+}
+
+static void
+cleanup_socket_dir(void)
+{
+	unlink(notify_socket);
+	rmdir(notify_sockdir);
+}
+
+static char *
+setup_socket_name(const char *suffix)
+{
+	const char *basedir;
+
+	if (getuid() == 0 && access("/run", F_OK) == 0) {
+		basedir = "/run";
+	} else {
+		basedir = getenv("TMPDIR");
+		if (basedir == NULL)
+			basedir = P_tmpdir;
+	}
+
+	if (asprintf(&notify_sockdir, "%s/%s.XXXXXX", basedir, suffix) < 0)
+		fatale("cannot allocate socket directory name");
+
+	if (mkdtemp(notify_sockdir) == NULL)
+		fatale("cannot create socket directory %s", notify_sockdir);
+
+	atexit(cleanup_socket_dir);
+
+	if (chown(notify_sockdir, runas_uid, runas_gid))
+		fatale("cannot change socket directory ownership");
+
+	if (asprintf(&notify_socket, "%s/notify", notify_sockdir) < 0)
+		fatale("cannot allocate socket name");
+
+	setenv("NOTIFY_SOCKET", notify_socket, 1);
+
+	return notify_socket;
+}
+
+static void
+set_socket_passcred(int fd)
+{
+#ifdef SO_PASSCRED
+	static const int enable = 1;
+
+	setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &enable, sizeof(enable));
+#endif
+}
+
+static int
+create_notify_socket(void)
+{
+	const char *sockname;
+	struct sockaddr_un su;
+	int fd, rc, flags;
+
+	/* Create notification socket. */
+	fd = socket(AF_UNIX, SOCK_DGRAM | SOCK_NONBLOCK, 0);
+	if (fd < 0)
+		fatale("cannot create notification socket");
+
+	/* We could set SOCK_CLOEXEC instead, but then we would need to
+	 * check whether the socket call failed, try and then do this anyway,
+	 * when we have no threading problems to worry about. */
+	flags = fcntl(fd, F_GETFD);
+	if (flags < 0)
+		fatale("cannot read fd flags for notification socket");
+	if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) < 0)
+		fatale("cannot set close-on-exec flag for notification socket");
+
+	sockname = setup_socket_name(".s-s-d-notify");
+
+	/* Bind to a socket in a temporary directory, selected based on
+	 * the platform. */
+	memset(&su, 0, sizeof(su));
+	su.sun_family = AF_UNIX;
+	strncpy(su.sun_path, sockname, sizeof(su.sun_path) - 1);
+
+	rc = bind(fd, &su, sizeof(su));
+	if (rc < 0)
+		fatale("cannot bind to notification socket");
+
+	rc = chmod(su.sun_path, 0660);
+	if (rc < 0)
+		fatale("cannot change notification socket permissions");
+
+	rc = chown(su.sun_path, runas_uid, runas_gid);
+	if (rc < 0)
+		fatale("cannot change notification socket ownership");
+
+	/* XXX: Verify we are talking to an expected child? Although it is not
+	 * clear whether this is feasible given the knowledge we have got. */
+	set_socket_passcred(fd);
+
+	return fd;
+}
+
+static void
+wait_for_notify(int fd)
+{
+	struct timespec startat, now, elapsed, timeout, timeout_orig;
+	fd_set fdrs;
+	int rc;
+
+	timeout.tv_sec = notify_timeout;
+	timeout.tv_nsec = 0;
+	timeout_orig = timeout;
+
+	timespec_gettime(&startat);
+
+	while (timeout.tv_sec >= 0 && timeout.tv_nsec >= 0) {
+		FD_ZERO(&fdrs);
+		FD_SET(fd, &fdrs);
+
+		/* Wait for input. */
+		debug("Waiting for notifications... (timeout %lusec %lunsec)\n",
+		      timeout.tv_sec, timeout.tv_nsec);
+		rc = pselect(fd + 1, &fdrs, NULL, NULL, &timeout, NULL);
+
+		/* Catch non-restartable errors, that is, not signals nor
+		 * kernel out of resources. */
+		if (rc < 0 && (errno != EINTR && errno != EAGAIN))
+			fatale("cannot monitor notification socket for activity");
+
+		/* Timed-out. */
+		if (rc == 0)
+			fatal("timed out waiting for a notification");
+
+		/* Update the timeout, as should not rely on pselect() having
+		 * done that for us, which is an unportable assumption. */
+		timespec_gettime(&now);
+		timespec_sub(&now, &startat, &elapsed);
+		timespec_sub(&timeout_orig, &elapsed, &timeout);
+
+		/* Restartable error, a signal or kernel out of resources. */
+		if (rc < 0)
+			continue;
+
+		/* Parse it and check for a supported notification message,
+		 * once we get a READY=1, we exit. */
+		for (;;) {
+			ssize_t nrecv;
+			char buf[4096];
+			char *line, *line_next;
+
+			nrecv = recv(fd, buf, sizeof(buf), 0);
+			if (nrecv < 0 && (errno != EINTR && errno != EAGAIN))
+				fatale("cannot receive notification packet");
+			if (nrecv < 0)
+				break;
+
+			buf[nrecv] = '\0';
+
+			for (line = buf; *line; line = line_next) {
+				line_next = strchrnul(line, '\n');
+				if (*line_next == '\n')
+					*line_next++ = '\0';
+
+				debug("Child sent some notification...\n");
+				if (strncmp(line, "EXTEND_TIMEOUT_USEC=", 20) == 0) {
+					int extend_usec = 0;
+
+					if (parse_unsigned(line + 20, 10, &extend_usec) != 0)
+						fatale("cannot parse extended timeout notification %s", line);
+
+					/* Reset the current timeout. */
+					timeout.tv_sec = extend_usec / 1000L;
+					timeout.tv_nsec = (extend_usec % 1000L) *
+					                  NANOSEC_IN_MILLISEC;
+					timeout_orig = timeout;
+
+					timespec_gettime(&startat);
+				} else if (strncmp(line, "ERRNO=", 6) == 0) {
+					int suberrno = 0;
+
+					if (parse_unsigned(line + 6, 10, &suberrno) != 0)
+						fatale("cannot parse errno notification %s", line);
+					errno = suberrno;
+					fatale("program failed to initialize");
+				} else if (strcmp(line, "READY=1") == 0) {
+					debug("-> Notification => ready for service.\n");
+					return;
+				} else {
+					debug("-> Notification line '%s' received\n", line);
+				}
+			}
+		}
+	}
+}
+
+static void
+write_pidfile(const char *filename, pid_t pid)
+{
+	FILE *fp;
+	int fd;
+
+	fd = open(filename, O_CREAT | O_WRONLY | O_TRUNC | O_NOFOLLOW, 0666);
+	if (fd < 0)
+		fp = NULL;
+	else
+		fp = fdopen(fd, "w");
+
+	if (fp == NULL)
+		fatale("unable to open pidfile '%s' for writing", filename);
+
+	fprintf(fp, "%d\n", pid);
+
+	if (fclose(fp))
+		fatale("unable to close pidfile '%s'", filename);
+}
+
+static void
+remove_pidfile(const char *filename)
+{
+	if (unlink(filename) < 0 && errno != ENOENT)
+		fatale("cannot remove pidfile '%s'", filename);
+}
+
+static void
+daemonize(void)
+{
+	int notify_fd = -1;
+	pid_t pid;
+	sigset_t mask;
+	sigset_t oldmask;
+
+	debug("Detaching to start %s...\n", startas);
+
+	/* Block SIGCHLD to allow waiting for the child process while it is
+	 * performing actions, such as creating a pidfile. */
+	sigemptyset(&mask);
+	sigaddset(&mask, SIGCHLD);
+	if (sigprocmask(SIG_BLOCK, &mask, &oldmask) == -1)
+		fatale("cannot block SIGCHLD");
+
+	if (notify_await)
+		notify_fd = create_notify_socket();
+
+	pid = fork();
+	if (pid < 0)
+		fatale("unable to do first fork");
+	else if (pid) { /* First Parent. */
+		/* Wait for the second parent to exit, so that if we need to
+		 * perform any actions there, like creating a pidfile, we do
+		 * not suffer from race conditions on return. */
+		wait_for_child(pid);
+
+		if (notify_await) {
+			/* Wait for a readiness notification from the second
+			 * child, so that we can safely exit when the service
+			 * is up. */
+			wait_for_notify(notify_fd);
+			close(notify_fd);
+			cleanup_socket_dir();
+		}
+
+		_exit(0);
+	}
+
+	/* Create a new session. */
+	if (setsid() < 0)
+		fatale("cannot set session ID");
+
+	pid = fork();
+	if (pid < 0)
+		fatale("unable to do second fork");
+	else if (pid) { /* Second parent. */
+		/* Set a default umask for dumb programs, which might get
+		 * overridden by the --umask option later on, so that we get
+		 * a defined umask when creating the pidfile. */
+		umask(022);
+
+		if (mpidfile && pidfile != NULL)
+			/* User wants _us_ to make the pidfile. */
+			write_pidfile(pidfile, pid);
+
+		_exit(0);
+	}
+
+	if (sigprocmask(SIG_SETMASK, &oldmask, NULL) == -1)
+		fatale("cannot restore signal mask");
+
+	debug("Detaching complete...\n");
+}
+
+static void
+pid_list_push(struct pid_list **list, pid_t pid)
+{
+	struct pid_list *p;
+
+	p = xmalloc(sizeof(*p));
+	p->next = *list;
+	p->pid = pid;
+	*list = p;
+}
+
+static void
+pid_list_free(struct pid_list **list)
+{
+	struct pid_list *here, *next;
+
+	for (here = *list; here != NULL; here = next) {
+		next = here->next;
+		free(here);
+	}
+
+	*list = NULL;
+}
+
+static void
+usage(void)
+{
+	printf(
+"Usage: start-stop-daemon [<option>...] <command>\n"
+"\n");
+
+	printf(
+"Commands:\n"
+"  -S, --start -- <argument>...  start a program and pass <arguments> to it\n"
+"  -K, --stop                    stop a program\n"
+"  -T, --status                  get the program status\n"
+"  -H, --help                    print help information\n"
+"  -V, --version                 print version\n"
+"\n");
+
+	printf(
+"Matching options (at least one is required):\n"
+"      --pid <pid>               pid to check\n"
+"      --ppid <ppid>             parent pid to check\n"
+"  -p, --pidfile <pid-file>      pid file to check\n"
+"  -x, --exec <executable>       program to start/check if it is running\n"
+"  -n, --name <process-name>     process name to check\n"
+"  -u, --user <username|uid>     process owner to check\n"
+"\n");
+
+	printf(
+"Options:\n"
+"  -g, --group <group|gid>       run process as this group\n"
+"  -c, --chuid <name|uid[:group|gid]>\n"
+"                                change to this user/group before starting\n"
+"                                  process\n"
+"  -s, --signal <signal>         signal to send (default TERM)\n"
+"  -a, --startas <pathname>      program to start (default is <executable>)\n"
+"  -r, --chroot <directory>      chroot to <directory> before starting\n"
+"  -d, --chdir <directory>       change to <directory> (default is /)\n"
+"  -N, --nicelevel <incr>        add incr to the process' nice level\n"
+"  -P, --procsched <policy[:prio]>\n"
+"                                use <policy> with <prio> for the kernel\n"
+"                                  process scheduler (default prio is 0)\n"
+"  -I, --iosched <class[:prio]>  use <class> with <prio> to set the IO\n"
+"                                  scheduler (default prio is 4)\n"
+"  -k, --umask <mask>            change the umask to <mask> before starting\n"
+"  -b, --background              force the process to detach\n"
+"      --notify-await            wait for a readiness notification\n"
+"      --notify-timeout <int>    timeout after <int> seconds of notify wait\n"
+"  -C, --no-close                do not close any file descriptor\n"
+"  -m, --make-pidfile            create the pidfile before starting\n"
+"      --remove-pidfile          delete the pidfile after stopping\n"
+"  -R, --retry <schedule>        check whether processes die, and retry\n"
+"  -t, --test                    test mode, don't do anything\n"
+"  -o, --oknodo                  exit status 0 (not 1) if nothing done\n"
+"  -q, --quiet                   be more quiet\n"
+"  -v, --verbose                 be more verbose\n"
+"\n");
+
+	printf(
+"Retry <schedule> is <item>|/<item>/... where <item> is one of\n"
+" -<signal-num>|[-]<signal-name>  send that signal\n"
+" <timeout>                       wait that many seconds\n"
+" forever                         repeat remainder forever\n"
+"or <schedule> may be just <timeout>, meaning <signal>/<timeout>/KILL/<timeout>\n"
+"\n");
+
+	printf(
+"The process scheduler <policy> can be one of:\n"
+"  other, fifo or rr\n"
+"\n");
+
+	printf(
+"The IO scheduler <class> can be one of:\n"
+"  real-time, best-effort or idle\n"
+"\n");
+
+	printf(
+"Exit status:\n"
+"  0 = done\n"
+"  1 = nothing done (=> 0 if --oknodo)\n"
+"  2 = with --retry, processes would not die\n"
+"  3 = trouble\n"
+"Exit status with --status:\n"
+"  0 = program is running\n"
+"  1 = program is not running and the pid file exists\n"
+"  3 = program is not running\n"
+"  4 = unable to determine status\n");
+}
+
+static void
+do_version(void)
+{
+	printf("start-stop-daemon %s for Debian\n\n", VERSION);
+
+	printf("Written by Marek Michalkiewicz, public domain.\n");
+}
+
+static void DPKG_ATTR_NORET
+badusage(const char *msg)
+{
+	if (msg)
+		fprintf(stderr, "%s: %s\n", progname, msg);
+	fprintf(stderr, "Try '%s --help' for more information.\n", progname);
+
+	if (action == ACTION_STATUS)
+		exit(STATUS_UNKNOWN);
+	else
+		exit(3);
+}
+
+struct sigpair {
+	const char *name;
+	int signal;
+};
+
+static const struct sigpair siglist[] = {
+	{ "ABRT",	SIGABRT	},
+	{ "ALRM",	SIGALRM	},
+	{ "FPE",	SIGFPE	},
+	{ "HUP",	SIGHUP	},
+	{ "ILL",	SIGILL	},
+	{ "INT",	SIGINT	},
+	{ "KILL",	SIGKILL	},
+	{ "PIPE",	SIGPIPE	},
+	{ "QUIT",	SIGQUIT	},
+	{ "SEGV",	SIGSEGV	},
+	{ "TERM",	SIGTERM	},
+	{ "USR1",	SIGUSR1	},
+	{ "USR2",	SIGUSR2	},
+	{ "CHLD",	SIGCHLD	},
+	{ "CONT",	SIGCONT	},
+	{ "STOP",	SIGSTOP	},
+	{ "TSTP",	SIGTSTP	},
+	{ "TTIN",	SIGTTIN	},
+	{ "TTOU",	SIGTTOU	}
+};
+
+static int
+parse_pid(const char *pid_str, int *pid_num)
+{
+	if (parse_unsigned(pid_str, 10, pid_num) != 0)
+		return -1;
+	if (*pid_num == 0)
+		return -1;
+
+	return 0;
+}
+
+static int
+parse_signal(const char *sig_str, int *sig_num)
+{
+	unsigned int i;
+
+	if (parse_unsigned(sig_str, 10, sig_num) == 0)
+		return 0;
+
+	for (i = 0; i < array_count(siglist); i++) {
+		if (strcmp(sig_str, siglist[i].name) == 0) {
+			*sig_num = siglist[i].signal;
+			return 0;
+		}
+	}
+	return -1;
+}
+
+static int
+parse_umask(const char *string, int *value_r)
+{
+	return parse_unsigned(string, 0, value_r);
+}
+
+static void
+validate_proc_schedule(void)
+{
+#if defined(_POSIX_PRIORITY_SCHEDULING) && _POSIX_PRIORITY_SCHEDULING > 0
+	int prio_min, prio_max;
+
+	prio_min = sched_get_priority_min(proc_sched->policy);
+	prio_max = sched_get_priority_max(proc_sched->policy);
+
+	if (proc_sched->priority < prio_min)
+		badusage("process scheduler priority less than min");
+	if (proc_sched->priority > prio_max)
+		badusage("process scheduler priority greater than max");
+#endif
+}
+
+static void
+parse_proc_schedule(const char *string)
+{
+	char *policy_str;
+	size_t policy_len;
+	int prio = 0;
+
+	policy_len = strcspn(string, ":");
+	policy_str = xstrndup(string, policy_len);
+
+	if (string[policy_len] == ':' &&
+	    parse_unsigned(string + policy_len + 1, 10, &prio) != 0)
+		fatale("invalid process scheduler priority");
+
+	proc_sched = xmalloc(sizeof(*proc_sched));
+	proc_sched->policy_name = policy_str;
+
+	if (strcmp(policy_str, "other") == 0) {
+		proc_sched->policy = SCHED_OTHER;
+		proc_sched->priority = 0;
+	} else if (strcmp(policy_str, "fifo") == 0) {
+		proc_sched->policy = SCHED_FIFO;
+		proc_sched->priority = prio;
+	} else if (strcmp(policy_str, "rr") == 0) {
+		proc_sched->policy = SCHED_RR;
+		proc_sched->priority = prio;
+	} else
+		badusage("invalid process scheduler policy");
+
+	validate_proc_schedule();
+}
+
+static void
+parse_io_schedule(const char *string)
+{
+	char *class_str;
+	size_t class_len;
+	int prio = 4;
+
+	class_len = strcspn(string, ":");
+	class_str = xstrndup(string, class_len);
+
+	if (string[class_len] == ':' &&
+	    parse_unsigned(string + class_len + 1, 10, &prio) != 0)
+		fatale("invalid IO scheduler priority");
+
+	io_sched = xmalloc(sizeof(*io_sched));
+	io_sched->policy_name = class_str;
+
+	if (strcmp(class_str, "real-time") == 0) {
+		io_sched->policy = IOPRIO_CLASS_RT;
+		io_sched->priority = prio;
+	} else if (strcmp(class_str, "best-effort") == 0) {
+		io_sched->policy = IOPRIO_CLASS_BE;
+		io_sched->priority = prio;
+	} else if (strcmp(class_str, "idle") == 0) {
+		io_sched->policy = IOPRIO_CLASS_IDLE;
+		io_sched->priority = 7;
+	} else
+		badusage("invalid IO scheduler policy");
+
+	if (io_sched->priority < IO_SCHED_PRIO_MIN)
+		badusage("IO scheduler priority less than min");
+	if (io_sched->priority > IO_SCHED_PRIO_MAX)
+		badusage("IO scheduler priority greater than max");
+}
+
+static void
+set_proc_schedule(struct res_schedule *sched)
+{
+#if defined(_POSIX_PRIORITY_SCHEDULING) && _POSIX_PRIORITY_SCHEDULING > 0
+	struct sched_param param;
+
+	param.sched_priority = sched->priority;
+
+	if (sched_setscheduler(getpid(), sched->policy, &param) == -1)
+		fatale("unable to set process scheduler");
+#endif
+}
+
+#ifdef HAVE_IOPRIO_SET
+static inline int
+ioprio_set(int which, int who, int ioprio)
+{
+	return syscall(SYS_ioprio_set, which, who, ioprio);
+}
+#endif
+
+static void
+set_io_schedule(struct res_schedule *sched)
+{
+#ifdef HAVE_IOPRIO_SET
+	int io_sched_mask;
+
+	io_sched_mask = IOPRIO_PRIO_VALUE(sched->policy, sched->priority);
+	if (ioprio_set(IOPRIO_WHO_PROCESS, getpid(), io_sched_mask) == -1)
+		warning("unable to alter IO priority to mask %i (%s)\n",
+		        io_sched_mask, strerror(errno));
+#endif
+}
+
+static void
+parse_schedule_item(const char *string, struct schedule_item *item)
+{
+	const char *after_hyph;
+
+	if (strcmp(string, "forever") == 0) {
+		item->type = sched_forever;
+	} else if (isdigit(string[0])) {
+		item->type = sched_timeout;
+		if (parse_unsigned(string, 10, &item->value) != 0)
+			badusage("invalid timeout value in schedule");
+	} else if ((after_hyph = string + (string[0] == '-')) &&
+	           parse_signal(after_hyph, &item->value) == 0) {
+		item->type = sched_signal;
+	} else {
+		badusage("invalid schedule item (must be [-]<signal-name>, "
+		         "-<signal-number>, <timeout> or 'forever'");
+	}
+}
+
+static void
+parse_schedule(const char *schedule_str)
+{
+	char item_buf[20];
+	const char *slash;
+	int count, repeatat;
+	size_t str_len;
+
+	count = 0;
+	for (slash = schedule_str; *slash; slash++)
+		if (*slash == '/')
+			count++;
+
+	schedule_length = (count == 0) ? 4 : count + 1;
+	schedule = xmalloc(sizeof(*schedule) * schedule_length);
+
+	if (count == 0) {
+		schedule[0].type = sched_signal;
+		schedule[0].value = signal_nr;
+		parse_schedule_item(schedule_str, &schedule[1]);
+		if (schedule[1].type != sched_timeout) {
+			badusage("--retry takes timeout, or schedule list"
+			         " of at least two items");
+		}
+		schedule[2].type = sched_signal;
+		schedule[2].value = SIGKILL;
+		schedule[3] = schedule[1];
+	} else {
+		count = 0;
+		repeatat = -1;
+		while (*schedule_str) {
+			slash = strchrnul(schedule_str, '/');
+			str_len = (size_t)(slash - schedule_str);
+			if (str_len >= sizeof(item_buf))
+				badusage("invalid schedule item: far too long"
+				         " (you must delimit items with slashes)");
+			memcpy(item_buf, schedule_str, str_len);
+			item_buf[str_len] = '\0';
+			schedule_str = *slash ? slash + 1 : slash;
+
+			parse_schedule_item(item_buf, &schedule[count]);
+			if (schedule[count].type == sched_forever) {
+				if (repeatat >= 0)
+					badusage("invalid schedule: 'forever'"
+					         " appears more than once");
+				repeatat = count;
+				continue;
+			}
+			count++;
+		}
+		if (repeatat == count)
+			badusage("invalid schedule: 'forever' appears last, "
+			         "nothing to repeat");
+		if (repeatat >= 0) {
+			schedule[count].type = sched_goto;
+			schedule[count].value = repeatat;
+			count++;
+		}
+		if (count != schedule_length)
+			BUG("count=%d != schedule_length=%d",
+			    count, schedule_length);
+	}
+}
+
+static void
+set_action(enum action_code new_action)
+{
+	if (action == new_action)
+		return;
+
+	if (action != ACTION_NONE)
+		badusage("only one command can be specified");
+
+	action = new_action;
+}
+
+#define OPT_PID		500
+#define OPT_PPID	501
+#define OPT_RM_PIDFILE	502
+#define OPT_NOTIFY_AWAIT	503
+#define OPT_NOTIFY_TIMEOUT	504
+
+static void
+parse_options(int argc, char * const *argv)
+{
+	static struct option longopts[] = {
+		{ "help",	  0, NULL, 'H'},
+		{ "stop",	  0, NULL, 'K'},
+		{ "start",	  0, NULL, 'S'},
+		{ "status",	  0, NULL, 'T'},
+		{ "version",	  0, NULL, 'V'},
+		{ "startas",	  1, NULL, 'a'},
+		{ "name",	  1, NULL, 'n'},
+		{ "oknodo",	  0, NULL, 'o'},
+		{ "pid",	  1, NULL, OPT_PID},
+		{ "ppid",	  1, NULL, OPT_PPID},
+		{ "pidfile",	  1, NULL, 'p'},
+		{ "quiet",	  0, NULL, 'q'},
+		{ "signal",	  1, NULL, 's'},
+		{ "test",	  0, NULL, 't'},
+		{ "user",	  1, NULL, 'u'},
+		{ "group",	  1, NULL, 'g'},
+		{ "chroot",	  1, NULL, 'r'},
+		{ "verbose",	  0, NULL, 'v'},
+		{ "exec",	  1, NULL, 'x'},
+		{ "chuid",	  1, NULL, 'c'},
+		{ "nicelevel",	  1, NULL, 'N'},
+		{ "procsched",	  1, NULL, 'P'},
+		{ "iosched",	  1, NULL, 'I'},
+		{ "umask",	  1, NULL, 'k'},
+		{ "background",	  0, NULL, 'b'},
+		{ "notify-await", 0, NULL, OPT_NOTIFY_AWAIT},
+		{ "notify-timeout", 1, NULL, OPT_NOTIFY_TIMEOUT},
+		{ "no-close",	  0, NULL, 'C'},
+		{ "make-pidfile", 0, NULL, 'm'},
+		{ "remove-pidfile", 0, NULL, OPT_RM_PIDFILE},
+		{ "retry",	  1, NULL, 'R'},
+		{ "chdir",	  1, NULL, 'd'},
+		{ NULL,		  0, NULL, 0  }
+	};
+	const char *pid_str = NULL;
+	const char *ppid_str = NULL;
+	const char *umask_str = NULL;
+	const char *signal_str = NULL;
+	const char *schedule_str = NULL;
+	const char *proc_schedule_str = NULL;
+	const char *io_schedule_str = NULL;
+	const char *notify_timeout_str = NULL;
+	size_t changeuser_len;
+	int c;
+
+	for (;;) {
+		c = getopt_long(argc, argv,
+		                "HKSVTa:n:op:qr:s:tu:vx:c:N:P:I:k:bCmR:g:d:",
+		                longopts, NULL);
+		if (c == -1)
+			break;
+		switch (c) {
+		case 'H':  /* --help */
+			usage();
+			exit(0);
+		case 'K':  /* --stop */
+			set_action(ACTION_STOP);
+			break;
+		case 'S':  /* --start */
+			set_action(ACTION_START);
+			break;
+		case 'T':  /* --status */
+			set_action(ACTION_STATUS);
+			break;
+		case 'V':  /* --version */
+			do_version();
+			exit(0);
+		case 'a':  /* --startas <pathname> */
+			startas = optarg;
+			break;
+		case 'n':  /* --name <process-name> */
+			match_mode |= MATCH_NAME;
+			cmdname = optarg;
+			break;
+		case 'o':  /* --oknodo */
+			exitnodo = 0;
+			break;
+		case OPT_PID: /* --pid <pid> */
+			match_mode |= MATCH_PID;
+			pid_str = optarg;
+			break;
+		case OPT_PPID: /* --ppid <ppid> */
+			match_mode |= MATCH_PPID;
+			ppid_str = optarg;
+			break;
+		case 'p':  /* --pidfile <pid-file> */
+			match_mode |= MATCH_PIDFILE;
+			pidfile = optarg;
+			break;
+		case 'q':  /* --quiet */
+			quietmode = true;
+			break;
+		case 's':  /* --signal <signal> */
+			signal_str = optarg;
+			break;
+		case 't':  /* --test */
+			testmode = true;
+			break;
+		case 'u':  /* --user <username>|<uid> */
+			match_mode |= MATCH_USER;
+			userspec = optarg;
+			break;
+		case 'v':  /* --verbose */
+			quietmode = -1;
+			break;
+		case 'x':  /* --exec <executable> */
+			match_mode |= MATCH_EXEC;
+			execname = optarg;
+			break;
+		case 'c':  /* --chuid <username>|<uid> */
+			/* We copy the string just in case we need the
+			 * argument later. */
+			changeuser_len = strcspn(optarg, ":");
+			changeuser = xstrndup(optarg, changeuser_len);
+			if (optarg[changeuser_len] == ':') {
+				if (optarg[changeuser_len + 1] == '\0')
+					fatal("missing group name");
+				changegroup = optarg + changeuser_len + 1;
+			}
+			break;
+		case 'g':  /* --group <group>|<gid> */
+			changegroup = optarg;
+			break;
+		case 'r':  /* --chroot /new/root */
+			changeroot = optarg;
+			break;
+		case 'N':  /* --nice */
+			nicelevel = atoi(optarg);
+			break;
+		case 'P':  /* --procsched */
+			proc_schedule_str = optarg;
+			break;
+		case 'I':  /* --iosched */
+			io_schedule_str = optarg;
+			break;
+		case 'k':  /* --umask <mask> */
+			umask_str = optarg;
+			break;
+		case 'b':  /* --background */
+			background = true;
+			break;
+		case OPT_NOTIFY_AWAIT:
+			notify_await = true;
+			break;
+		case OPT_NOTIFY_TIMEOUT:
+			notify_timeout_str = optarg;
+			break;
+		case 'C': /* --no-close */
+			close_io = false;
+			break;
+		case 'm':  /* --make-pidfile */
+			mpidfile = true;
+			break;
+		case OPT_RM_PIDFILE: /* --remove-pidfile */
+			rpidfile = true;
+			break;
+		case 'R':  /* --retry <schedule>|<timeout> */
+			schedule_str = optarg;
+			break;
+		case 'd':  /* --chdir /new/dir */
+			changedir = optarg;
+			break;
+		default:
+			/* Message printed by getopt. */
+			badusage(NULL);
+		}
+	}
+
+	if (pid_str != NULL) {
+		if (parse_pid(pid_str, &match_pid) != 0)
+			badusage("pid value must be a number greater than 0");
+	}
+
+	if (ppid_str != NULL) {
+		if (parse_pid(ppid_str, &match_ppid) != 0)
+			badusage("ppid value must be a number greater than 0");
+	}
+
+	if (signal_str != NULL) {
+		if (parse_signal(signal_str, &signal_nr) != 0)
+			badusage("signal value must be numeric or name"
+			         " of signal (KILL, INT, ...)");
+	}
+
+	if (schedule_str != NULL) {
+		parse_schedule(schedule_str);
+	}
+
+	if (proc_schedule_str != NULL)
+		parse_proc_schedule(proc_schedule_str);
+
+	if (io_schedule_str != NULL)
+		parse_io_schedule(io_schedule_str);
+
+	if (umask_str != NULL) {
+		if (parse_umask(umask_str, &umask_value) != 0)
+			badusage("umask value must be a positive number");
+	}
+
+	if (notify_timeout_str != NULL)
+		if (parse_unsigned(notify_timeout_str, 10, &notify_timeout) != 0)
+			badusage("invalid notify timeout value");
+
+	if (action == ACTION_NONE)
+		badusage("need one of --start or --stop or --status");
+
+	if (match_mode == MATCH_NONE ||
+	    (!execname && !cmdname && !userspec &&
+	     !pid_str && !ppid_str && !pidfile))
+		badusage("need at least one of --exec, --pid, --ppid, --pidfile, --user or --name");
+
+#ifdef PROCESS_NAME_SIZE
+	if (cmdname && strlen(cmdname) > PROCESS_NAME_SIZE)
+		warning("this system is not able to track process names\n"
+		        "longer than %d characters, please use --exec "
+		        "instead of --name.\n", PROCESS_NAME_SIZE);
+#endif
+
+	if (!startas)
+		startas = execname;
+
+	if (action == ACTION_START && !startas)
+		badusage("--start needs --exec or --startas");
+
+	if (mpidfile && pidfile == NULL)
+		badusage("--make-pidfile requires --pidfile");
+	if (rpidfile && pidfile == NULL)
+		badusage("--remove-pidfile requires --pidfile");
+
+	if (pid_str && pidfile)
+		badusage("need either --pid or --pidfile, not both");
+
+	if (background && action != ACTION_START)
+		badusage("--background is only relevant with --start");
+
+	if (!close_io && !background)
+		badusage("--no-close is only relevant with --background");
+}
+
+static void
+setup_options(void)
+{
+	if (execname) {
+		char *fullexecname;
+
+		/* If it's a relative path, normalize it. */
+		if (execname[0] != '/')
+			execname = newpath(changedir, execname);
+
+		if (changeroot)
+			fullexecname = newpath(changeroot, execname);
+		else
+			fullexecname = execname;
+
+		if (stat(fullexecname, &exec_stat))
+			fatale("unable to stat %s", fullexecname);
+
+		if (fullexecname != execname)
+			free(fullexecname);
+	}
+
+	if (userspec && parse_unsigned(userspec, 10, &user_id) < 0) {
+		struct passwd *pw;
+
+		pw = getpwnam(userspec);
+		if (!pw)
+			fatale("user '%s' not found", userspec);
+
+		user_id = pw->pw_uid;
+	}
+
+	if (changegroup && parse_unsigned(changegroup, 10, &runas_gid) < 0) {
+		struct group *gr;
+
+		gr = getgrnam(changegroup);
+		if (!gr)
+			fatale("group '%s' not found", changegroup);
+		changegroup = gr->gr_name;
+		runas_gid = gr->gr_gid;
+	}
+	if (changeuser) {
+		struct passwd *pw;
+		struct stat st;
+
+		if (parse_unsigned(changeuser, 10, &runas_uid) == 0)
+			pw = getpwuid(runas_uid);
+		else
+			pw = getpwnam(changeuser);
+		if (!pw)
+			fatale("user '%s' not found", changeuser);
+		changeuser = pw->pw_name;
+		runas_uid = pw->pw_uid;
+		if (changegroup == NULL) {
+			/* Pass the default group of this user. */
+			changegroup = ""; /* Just empty. */
+			runas_gid = pw->pw_gid;
+		}
+		if (stat(pw->pw_dir, &st) == 0)
+			setenv("HOME", pw->pw_dir, 1);
+	}
+}
+
+#if defined(OS_Linux)
+static const char *
+proc_status_field(pid_t pid, const char *field)
+{
+	static char *line = NULL;
+	static size_t line_size = 0;
+
+	FILE *fp;
+	char filename[32];
+	char *value = NULL;
+	ssize_t line_len;
+	size_t field_len = strlen(field);
+
+	sprintf(filename, "/proc/%d/status", pid);
+	fp = fopen(filename, "r");
+	if (!fp)
+		return NULL;
+	while ((line_len = getline(&line, &line_size, fp)) >= 0) {
+		if (strncasecmp(line, field, field_len) == 0) {
+			line[line_len - 1] = '\0';
+
+			value = line + field_len;
+			while (isspace(*value))
+				value++;
+
+			break;
+		}
+	}
+	fclose(fp);
+
+	return value;
+}
+#elif defined(OS_AIX)
+static bool
+proc_get_psinfo(pid_t pid, struct psinfo *psinfo)
+{
+	char filename[64];
+	FILE *fp;
+
+	sprintf(filename, "/proc/%d/psinfo", pid);
+	fp = fopen(filename, "r");
+	if (!fp)
+		return false;
+	if (fread(psinfo, sizeof(*psinfo), 1, fp) == 0) {
+		fclose(fp);
+		return false;
+	}
+	if (ferror(fp)) {
+		fclose(fp);
+		return false;
+	}
+
+	fclose(fp);
+
+	return true;
+}
+#elif defined(OS_Hurd)
+static void
+init_procset(void)
+{
+	struct ps_context *context;
+	error_t err;
+
+	err = ps_context_create(getproc(), &context);
+	if (err)
+		error(1, err, "ps_context_create");
+
+	err = proc_stat_list_create(context, &procset);
+	if (err)
+		error(1, err, "proc_stat_list_create");
+
+	err = proc_stat_list_add_all(procset, 0, 0);
+	if (err)
+		error(1, err, "proc_stat_list_add_all");
+}
+
+static struct proc_stat *
+get_proc_stat(pid_t pid, ps_flags_t flags)
+{
+	struct proc_stat *ps;
+	ps_flags_t wanted_flags = PSTAT_PID | flags;
+
+	if (!procset)
+		init_procset();
+
+	ps = proc_stat_list_pid_proc_stat(procset, pid);
+	if (!ps)
+		return NULL;
+	if (proc_stat_set_flags(ps, wanted_flags))
+		return NULL;
+	if ((proc_stat_flags(ps) & wanted_flags) != wanted_flags)
+		return NULL;
+
+	return ps;
+}
+#elif defined(HAVE_KVM_H)
+static kvm_t *
+ssd_kvm_open(void)
+{
+	kvm_t *kd;
+	char errbuf[_POSIX2_LINE_MAX];
+
+	kd = kvm_openfiles(NULL, KVM_MEMFILE, NULL, O_RDONLY, errbuf);
+	if (kd == NULL)
+		errx(1, "%s", errbuf);
+
+	return kd;
+}
+
+static struct kinfo_proc *
+ssd_kvm_get_procs(kvm_t *kd, int op, int arg, int *count)
+{
+	struct kinfo_proc *kp;
+	int lcount;
+
+	if (count == NULL)
+		count = &lcount;
+	*count = 0;
+
+#if defined(OS_OpenBSD)
+	kp = kvm_getprocs(kd, op, arg, sizeof(*kp), count);
+#else
+	kp = kvm_getprocs(kd, op, arg, count);
+#endif
+	if (kp == NULL && errno != ESRCH)
+		errx(1, "%s", kvm_geterr(kd));
+
+	return kp;
+}
+#endif
+
+#if defined(OS_Linux)
+static bool
+pid_is_exec(pid_t pid, const struct stat *esb)
+{
+	char lname[32];
+	char lcontents[_POSIX_PATH_MAX + 1];
+	char *filename;
+	const char deleted[] = " (deleted)";
+	int nread;
+	struct stat sb;
+
+	sprintf(lname, "/proc/%d/exe", pid);
+	nread = readlink(lname, lcontents, sizeof(lcontents) - 1);
+	if (nread == -1)
+		return false;
+
+	filename = lcontents;
+	filename[nread] = '\0';
+
+	/* OpenVZ kernels contain a bogus patch that instead of appending,
+	 * prepends the deleted marker. Workaround those. Otherwise handle
+	 * the normal appended marker. */
+	if (strncmp(filename, deleted, strlen(deleted)) == 0)
+		filename += strlen(deleted);
+	else if (strcmp(filename + nread - strlen(deleted), deleted) == 0)
+		filename[nread - strlen(deleted)] = '\0';
+
+	if (stat(filename, &sb) != 0)
+		return false;
+
+	return (sb.st_dev == esb->st_dev && sb.st_ino == esb->st_ino);
+}
+#elif defined(OS_AIX)
+static bool
+pid_is_exec(pid_t pid, const struct stat *esb)
+{
+	struct stat sb;
+	char filename[64];
+
+	sprintf(filename, "/proc/%d/object/a.out", pid);
+
+	if (stat(filename, &sb) != 0)
+		return false;
+
+	return sb.st_dev == esb->st_dev && sb.st_ino == esb->st_ino;
+}
+#elif defined(OS_Hurd)
+static bool
+pid_is_exec(pid_t pid, const struct stat *esb)
+{
+	struct proc_stat *ps;
+	struct stat sb;
+	const char *filename;
+
+	ps = get_proc_stat(pid, PSTAT_ARGS);
+	if (ps == NULL)
+		return false;
+
+	/* On old Hurd systems we have to use the argv[0] value, because
+	 * there is nothing better. */
+	filename = proc_stat_args(ps);
+#ifdef PSTAT_EXE
+	/* On new Hurd systems we can use the correct value, as long
+	 * as it's not NULL nor empty, as it was the case on the first
+	 * implementation. */
+	if (proc_stat_set_flags(ps, PSTAT_EXE) == 0 &&
+	    proc_stat_flags(ps) & PSTAT_EXE &&
+	    proc_stat_exe(ps) != NULL &&
+	    proc_stat_exe(ps)[0] != '\0')
+		filename = proc_stat_exe(ps);
+#endif
+
+	if (stat(filename, &sb) != 0)
+		return false;
+
+	return (sb.st_dev == esb->st_dev && sb.st_ino == esb->st_ino);
+}
+#elif defined(OS_Darwin)
+static bool
+pid_is_exec(pid_t pid, const struct stat *esb)
+{
+	struct stat sb;
+	char pathname[_POSIX_PATH_MAX];
+
+	if (proc_pidpath(pid, pathname, sizeof(pathname)) < 0)
+		return false;
+
+	if (stat(pathname, &sb) != 0)
+		return false;
+
+	return (sb.st_dev == esb->st_dev && sb.st_ino == esb->st_ino);
+}
+#elif defined(OS_HPUX)
+static bool
+pid_is_exec(pid_t pid, const struct stat *esb)
+{
+	struct pst_status pst;
+
+	if (pstat_getproc(&pst, sizeof(pst), (size_t)0, (int)pid) < 0)
+		return false;
+	return ((dev_t)pst.pst_text.psf_fsid.psfs_id == esb->st_dev &&
+	        (ino_t)pst.pst_text.psf_fileid == esb->st_ino);
+}
+#elif defined(OS_FreeBSD)
+static bool
+pid_is_exec(pid_t pid, const struct stat *esb)
+{
+	struct stat sb;
+	int error, mib[4];
+	size_t len;
+	char pathname[PATH_MAX];
+
+	mib[0] = CTL_KERN;
+	mib[1] = KERN_PROC;
+	mib[2] = KERN_PROC_PATHNAME;
+	mib[3] = pid;
+	len = sizeof(pathname);
+
+	error = sysctl(mib, 4, pathname, &len, NULL, 0);
+	if (error != 0 && errno != ESRCH)
+		return false;
+	if (len == 0)
+		pathname[0] = '\0';
+
+	if (stat(pathname, &sb) != 0)
+		return false;
+
+	return (sb.st_dev == esb->st_dev && sb.st_ino == esb->st_ino);
+}
+#elif defined(HAVE_KVM_H)
+static bool
+pid_is_exec(pid_t pid, const struct stat *esb)
+{
+	kvm_t *kd;
+	int argv_len = 0;
+	struct kinfo_proc *kp;
+	struct stat sb;
+	char buf[_POSIX2_LINE_MAX];
+	char **pid_argv_p;
+	char *start_argv_0_p, *end_argv_0_p;
+	bool res = false;
+
+	kd = ssd_kvm_open();
+	kp = ssd_kvm_get_procs(kd, KERN_PROC_PID, pid, NULL);
+	if (kp == NULL)
+		goto cleanup;
+
+	pid_argv_p = kvm_getargv(kd, kp, argv_len);
+	if (pid_argv_p == NULL)
+		errx(1, "%s", kvm_geterr(kd));
+
+	/* Find and compare string. */
+	start_argv_0_p = *pid_argv_p;
+
+	/* Find end of argv[0] then copy and cut of str there. */
+	end_argv_0_p = strchr(*pid_argv_p, ' ');
+	if (end_argv_0_p == NULL)
+		/* There seems to be no space, so we have the command
+		 * already in its desired form. */
+		start_argv_0_p = *pid_argv_p;
+	else {
+		/* Tests indicate that this never happens, since
+		 * kvm_getargv itself cuts of tailing stuff. This is
+		 * not what the manpage says, however. */
+		strncpy(buf, *pid_argv_p, (end_argv_0_p - start_argv_0_p));
+		buf[(end_argv_0_p - start_argv_0_p) + 1] = '\0';
+		start_argv_0_p = buf;
+	}
+
+	if (stat(start_argv_0_p, &sb) != 0)
+		goto cleanup;
+
+	res = (sb.st_dev == esb->st_dev && sb.st_ino == esb->st_ino);
+
+cleanup:
+	kvm_close(kd);
+
+	return res;
+}
+#endif
+
+#if defined(OS_Linux)
+static bool
+pid_is_child(pid_t pid, pid_t ppid)
+{
+	const char *ppid_str;
+	pid_t proc_ppid;
+	int rc;
+
+	ppid_str = proc_status_field(pid, "PPid:");
+	if (ppid_str == NULL)
+		return false;
+
+	rc = parse_pid(ppid_str, &proc_ppid);
+	if (rc < 0)
+		return false;
+
+	return proc_ppid == ppid;
+}
+#elif defined(OS_Hurd)
+static bool
+pid_is_child(pid_t pid, pid_t ppid)
+{
+	struct proc_stat *ps;
+	struct procinfo *pi;
+
+	ps = get_proc_stat(pid, PSTAT_PROC_INFO);
+	if (ps == NULL)
+		return false;
+
+	pi = proc_stat_proc_info(ps);
+
+	return pi->ppid == ppid;
+}
+#elif defined(OS_Darwin)
+static bool
+pid_is_child(pid_t pid, pid_t ppid)
+{
+	struct proc_bsdinfo info;
+
+	if (proc_pidinfo(pid, PROC_PIDTBSDINFO, 0, &info, sizeof(info)) < 0)
+		return false;
+
+	return (pid_t)info.pbi_ppid == ppid;
+}
+#elif defined(OS_AIX)
+static bool
+pid_is_child(pid_t pid, pid_t ppid)
+{
+	struct psinfo psi;
+
+	if (!proc_get_psinfo(pid, &psi))
+		return false;
+
+	return (pid_t)psi.pr_ppid == ppid;
+}
+#elif defined(OS_HPUX)
+static bool
+pid_is_child(pid_t pid, pid_t ppid)
+{
+	struct pst_status pst;
+
+	if (pstat_getproc(&pst, sizeof(pst), (size_t)0, (int)pid) < 0)
+		return false;
+
+	return pst.pst_ppid == ppid;
+}
+#elif defined(OS_FreeBSD)
+static bool
+pid_is_child(pid_t pid, pid_t ppid)
+{
+	struct kinfo_proc kp;
+	int rc, mib[4];
+	size_t len;
+
+	mib[0] = CTL_KERN;
+	mib[1] = KERN_PROC;
+	mib[2] = KERN_PROC_PID;
+	mib[3] = pid;
+	len = sizeof(kp);
+
+	rc = sysctl(mib, 4, &kp, &len, NULL, 0);
+	if (rc != 0 && errno != ESRCH)
+		return false;
+	if (len == 0 || len != sizeof(kp))
+		return false;
+
+	return kp.ki_ppid == ppid;
+}
+#elif defined(HAVE_KVM_H)
+static bool
+pid_is_child(pid_t pid, pid_t ppid)
+{
+	kvm_t *kd;
+	struct kinfo_proc *kp;
+	pid_t proc_ppid;
+	bool res = false;
+
+	kd = ssd_kvm_open();
+	kp = ssd_kvm_get_procs(kd, KERN_PROC_PID, pid, NULL);
+	if (kp == NULL)
+		goto cleanup;
+
+#if defined(OS_FreeBSD)
+	proc_ppid = kp->ki_ppid;
+#elif defined(OS_OpenBSD)
+	proc_ppid = kp->p_ppid;
+#elif defined(OS_DragonFlyBSD)
+	proc_ppid = kp->kp_ppid;
+#else
+	proc_ppid = kp->kp_proc.p_ppid;
+#endif
+
+	res = (proc_ppid == ppid);
+
+cleanup:
+	kvm_close(kd);
+
+	return res;
+}
+#endif
+
+#if defined(OS_Linux)
+static bool
+pid_is_user(pid_t pid, uid_t uid)
+{
+	struct stat sb;
+	char buf[32];
+
+	sprintf(buf, "/proc/%d", pid);
+	if (stat(buf, &sb) != 0)
+		return false;
+	return (sb.st_uid == uid);
+}
+#elif defined(OS_Hurd)
+static bool
+pid_is_user(pid_t pid, uid_t uid)
+{
+	struct proc_stat *ps;
+
+	ps = get_proc_stat(pid, PSTAT_OWNER_UID);
+	return ps && (uid_t)proc_stat_owner_uid(ps) == uid;
+}
+#elif defined(OS_Darwin)
+static bool
+pid_is_user(pid_t pid, uid_t uid)
+{
+	struct proc_bsdinfo info;
+
+	if (proc_pidinfo(pid, PROC_PIDTBSDINFO, 0, &info, sizeof(info)) < 0)
+		return false;
+
+	return info.pbi_ruid == uid;
+}
+#elif defined(OS_AIX)
+static bool
+pid_is_user(pid_t pid, uid_t uid)
+{
+	struct psinfo psi;
+
+	if (!proc_get_psinfo(pid, &psi))
+		return false;
+
+	return psi.pr_uid == uid;
+}
+#elif defined(OS_HPUX)
+static bool
+pid_is_user(pid_t pid, uid_t uid)
+{
+	struct pst_status pst;
+
+	if (pstat_getproc(&pst, sizeof(pst), (size_t)0, (int)pid) < 0)
+		return false;
+	return ((uid_t)pst.pst_uid == uid);
+}
+#elif defined(OS_FreeBSD)
+static bool
+pid_is_user(pid_t pid, uid_t uid)
+{
+	struct kinfo_proc kp;
+	int rc, mib[4];
+	size_t len;
+
+	mib[0] = CTL_KERN;
+	mib[1] = KERN_PROC;
+	mib[2] = KERN_PROC_PID;
+	mib[3] = pid;
+	len = sizeof(kp);
+
+	rc = sysctl(mib, 4, &kp, &len, NULL, 0);
+	if (rc != 0 && errno != ESRCH)
+		return false;
+	if (len == 0 || len != sizeof(kp))
+		return false;
+
+	return kp.ki_ruid == uid;
+}
+#elif defined(HAVE_KVM_H)
+static bool
+pid_is_user(pid_t pid, uid_t uid)
+{
+	kvm_t *kd;
+	uid_t proc_uid;
+	struct kinfo_proc *kp;
+	bool res = false;
+
+	kd = ssd_kvm_open();
+	kp = ssd_kvm_get_procs(kd, KERN_PROC_PID, pid, NULL);
+	if (kp == NULL)
+		goto cleanup;
+
+#if defined(OS_FreeBSD)
+	proc_uid = kp->ki_ruid;
+#elif defined(OS_OpenBSD)
+	proc_uid = kp->p_ruid;
+#elif defined(OS_DragonFlyBSD)
+	proc_uid = kp->kp_ruid;
+#elif defined(OS_NetBSD)
+	proc_uid = kp->kp_eproc.e_pcred.p_ruid;
+#else
+	if (kp->kp_proc.p_cred)
+		kvm_read(kd, (u_long)&(kp->kp_proc.p_cred->p_ruid),
+		         &proc_uid, sizeof(uid_t));
+	else
+		goto cleanup;
+#endif
+
+	res = (proc_uid == (uid_t)uid);
+
+cleanup:
+	kvm_close(kd);
+
+	return res;
+}
+#endif
+
+#if defined(OS_Linux)
+static bool
+pid_is_cmd(pid_t pid, const char *name)
+{
+	const char *comm;
+
+	comm = proc_status_field(pid, "Name:");
+	if (comm == NULL)
+		return false;
+
+	return strcmp(comm, name) == 0;
+}
+#elif defined(OS_Hurd)
+static bool
+pid_is_cmd(pid_t pid, const char *name)
+{
+	struct proc_stat *ps;
+	size_t argv0_len;
+	const char *argv0;
+	const char *binary_name;
+
+	ps = get_proc_stat(pid, PSTAT_ARGS);
+	if (ps == NULL)
+		return false;
+
+	argv0 = proc_stat_args(ps);
+	argv0_len = strlen(argv0) + 1;
+
+	binary_name = basename(argv0);
+	if (strcmp(binary_name, name) == 0)
+		return true;
+
+	/* XXX: This is all kinds of ugly, but on the Hurd there's no way to
+	 * know the command name of a process, so we have to try to match
+	 * also on argv[1] for the case of an interpreted script. */
+	if (proc_stat_args_len(ps) > argv0_len) {
+		const char *script_name = basename(argv0 + argv0_len);
+
+		return strcmp(script_name, name) == 0;
+	}
+
+	return false;
+}
+#elif defined(OS_AIX)
+static bool
+pid_is_cmd(pid_t pid, const char *name)
+{
+	struct psinfo psi;
+
+	if (!proc_get_psinfo(pid, &psi))
+		return false;
+
+	return strcmp(psi.pr_fname, name) == 0;
+}
+#elif defined(OS_HPUX)
+static bool
+pid_is_cmd(pid_t pid, const char *name)
+{
+	struct pst_status pst;
+
+	if (pstat_getproc(&pst, sizeof(pst), (size_t)0, (int)pid) < 0)
+		return false;
+	return (strcmp(pst.pst_ucomm, name) == 0);
+}
+#elif defined(OS_Darwin)
+static bool
+pid_is_cmd(pid_t pid, const char *name)
+{
+	char pathname[_POSIX_PATH_MAX];
+
+	if (proc_pidpath(pid, pathname, sizeof(pathname)) < 0)
+		return false;
+
+	return strcmp(pathname, name) == 0;
+}
+#elif defined(OS_FreeBSD)
+static bool
+pid_is_cmd(pid_t pid, const char *name)
+{
+	struct kinfo_proc kp;
+	int rc, mib[4];
+	size_t len;
+
+	mib[0] = CTL_KERN;
+	mib[1] = KERN_PROC;
+	mib[2] = KERN_PROC_PID;
+	mib[3] = pid;
+	len = sizeof(kp);
+
+	rc = sysctl(mib, 4, &kp, &len, NULL, 0);
+	if (rc != 0 && errno != ESRCH)
+		return false;
+	if (len == 0 || len != sizeof(kp))
+		return false;
+
+	return strcmp(kp.ki_comm, name) == 0;
+}
+#elif defined(HAVE_KVM_H)
+static bool
+pid_is_cmd(pid_t pid, const char *name)
+{
+	kvm_t *kd;
+	struct kinfo_proc *kp;
+	char *process_name;
+	bool res = false;
+
+	kd = ssd_kvm_open();
+	kp = ssd_kvm_get_procs(kd, KERN_PROC_PID, pid, NULL);
+	if (kp == NULL)
+		goto cleanup;
+
+#if defined(OS_FreeBSD)
+	process_name = kp->ki_comm;
+#elif defined(OS_OpenBSD)
+	process_name = kp->p_comm;
+#elif defined(OS_DragonFlyBSD)
+	process_name = kp->kp_comm;
+#else
+	process_name = kp->kp_proc.p_comm;
+#endif
+
+	res = (strcmp(name, process_name) == 0);
+
+cleanup:
+	kvm_close(kd);
+
+	return res;
+}
+#endif
+
+#if defined(OS_Hurd)
+static bool
+pid_is_running(pid_t pid)
+{
+	return get_proc_stat(pid, 0) != NULL;
+}
+#else /* !OS_Hurd */
+static bool
+pid_is_running(pid_t pid)
+{
+	if (kill(pid, 0) == 0 || errno == EPERM)
+		return true;
+	else if (errno == ESRCH)
+		return false;
+	else
+		fatale("error checking pid %u status", pid);
+}
+#endif
+
+static enum status_code
+pid_check(pid_t pid)
+{
+	if (execname && !pid_is_exec(pid, &exec_stat))
+		return STATUS_DEAD;
+	if (match_ppid > 0 && !pid_is_child(pid, match_ppid))
+		return STATUS_DEAD;
+	if (userspec && !pid_is_user(pid, user_id))
+		return STATUS_DEAD;
+	if (cmdname && !pid_is_cmd(pid, cmdname))
+		return STATUS_DEAD;
+	if (action != ACTION_STOP && !pid_is_running(pid))
+		return STATUS_DEAD;
+
+	pid_list_push(&found, pid);
+
+	return STATUS_OK;
+}
+
+static enum status_code
+do_pidfile(const char *name)
+{
+	FILE *f;
+	static pid_t pid = 0;
+
+	if (pid)
+		return pid_check(pid);
+
+	f = fopen(name, "r");
+	if (f) {
+		enum status_code pid_status;
+
+		/* If we are only matching on the pidfile, and it is owned by
+		 * a non-root user, then this is a security risk, and the
+		 * contents cannot be trusted, because the daemon might have
+		 * been compromised.
+		 *
+		 * If the pidfile is world-writable we refuse to parse it.
+		 *
+		 * If we got /dev/null specified as the pidfile, we ignore the
+		 * checks, as this is being used to run processes no matter
+		 * what. */
+		if (strcmp(name, "/dev/null") != 0) {
+			struct stat st;
+			int fd = fileno(f);
+
+			if (fstat(fd, &st) < 0)
+				fatale("cannot stat pidfile %s", name);
+
+			if (match_mode == MATCH_PIDFILE &&
+			    ((st.st_uid != getuid() && st.st_uid != 0) ||
+			     (st.st_gid != getgid() && st.st_gid != 0)))
+				fatal("matching only on non-root pidfile %s is insecure", name);
+			if (st.st_mode & 0002)
+				fatal("matching on world-writable pidfile %s is insecure", name);
+
+		}
+
+		if (fscanf(f, "%d", &pid) == 1)
+			pid_status = pid_check(pid);
+		else
+			pid_status = STATUS_UNKNOWN;
+		fclose(f);
+
+		if (pid_status == STATUS_DEAD)
+			return STATUS_DEAD_PIDFILE;
+		else
+			return pid_status;
+	} else if (errno == ENOENT)
+		return STATUS_DEAD;
+	else
+		fatale("unable to open pidfile %s", name);
+}
+
+#if defined(OS_Linux) || defined(OS_Solaris) || defined(OS_AIX)
+static enum status_code
+do_procinit(void)
+{
+	DIR *procdir;
+	struct dirent *entry;
+	int foundany;
+	pid_t pid;
+	enum status_code prog_status = STATUS_DEAD;
+
+	procdir = opendir("/proc");
+	if (!procdir)
+		fatale("unable to opendir /proc");
+
+	foundany = 0;
+	while ((entry = readdir(procdir)) != NULL) {
+		enum status_code pid_status;
+
+		if (sscanf(entry->d_name, "%d", &pid) != 1)
+			continue;
+		foundany++;
+
+		pid_status = pid_check(pid);
+		if (pid_status < prog_status)
+			prog_status = pid_status;
+	}
+	closedir(procdir);
+	if (foundany == 0)
+		fatal("nothing in /proc - not mounted?");
+
+	return prog_status;
+}
+#elif defined(OS_Hurd)
+static int
+check_proc_stat(struct proc_stat *ps)
+{
+	pid_check(proc_stat_pid(ps));
+	return 0;
+}
+
+static enum status_code
+do_procinit(void)
+{
+	if (!procset)
+		init_procset();
+
+	proc_stat_list_for_each(procset, check_proc_stat);
+
+	if (found)
+		return STATUS_OK;
+	else
+		return STATUS_DEAD;
+}
+#elif defined(OS_Darwin)
+static enum status_code
+do_procinit(void)
+{
+	pid_t *pid_buf;
+	int i, npids, pid_bufsize;
+	enum status_code prog_status = STATUS_DEAD;
+
+	npids = proc_listallpids(NULL, 0);
+	if (npids == 0)
+		return STATUS_UNKNOWN;
+
+	/* Try to avoid sudden changes in number of PIDs. */
+	npids += 4096;
+	pid_bufsize = sizeof(pid_t) * npids;
+	pid_buf = xmalloc(pid_bufsize);
+
+	npids = proc_listallpids(pid_buf, pid_bufsize);
+	if (npids == 0)
+		return STATUS_UNKNOWN;
+
+	for (i = 0; i < npids; i++) {
+		enum status_code pid_status;
+
+		pid_status = pid_check(pid_buf[i]);
+		if (pid_status < prog_status)
+			prog_status = pid_status;
+	}
+
+	free(pid_buf);
+
+	return prog_status;
+}
+#elif defined(OS_HPUX)
+static enum status_code
+do_procinit(void)
+{
+	struct pst_status pst[10];
+	int i, count;
+	int idx = 0;
+	enum status_code prog_status = STATUS_DEAD;
+
+	while ((count = pstat_getproc(pst, sizeof(pst[0]), 10, idx)) > 0) {
+		enum status_code pid_status;
+
+		for (i = 0; i < count; i++) {
+			pid_status = pid_check(pst[i].pst_pid);
+			if (pid_status < prog_status)
+				prog_status = pid_status;
+		}
+		idx = pst[count - 1].pst_idx + 1;
+	}
+
+	return prog_status;
+}
+#elif defined(OS_FreeBSD)
+static enum status_code
+do_procinit(void)
+{
+	struct kinfo_proc *kp;
+	int rc, mib[3];
+	size_t len = 0;
+	int nentries, i;
+	enum status_code prog_status = STATUS_DEAD;
+
+	mib[0] = CTL_KERN;
+	mib[1] = KERN_PROC;
+	mib[2] = KERN_PROC_PROC;
+
+	rc = sysctl(mib, 3, NULL, &len, NULL, 0);
+	if (rc != 0 && errno != ESRCH)
+		return STATUS_UNKNOWN;
+	if (len == 0)
+		return STATUS_UNKNOWN;
+
+	kp = xmalloc(len);
+	rc = sysctl(mib, 3, kp, &len, NULL, 0);
+	if (rc != 0 && errno != ESRCH)
+		return STATUS_UNKNOWN;
+	if (len == 0)
+		return STATUS_UNKNOWN;
+	nentries = len / sizeof(*kp);
+
+	for (i = 0; i < nentries; i++) {
+		enum status_code pid_status;
+
+		pid_status = pid_check(kp[i].ki_pid);
+		if (pid_status < prog_status)
+			prog_status = pid_status;
+	}
+
+	free(kp);
+
+	return prog_status;
+}
+#elif defined(HAVE_KVM_H)
+static enum status_code
+do_procinit(void)
+{
+	kvm_t *kd;
+	int nentries, i;
+	struct kinfo_proc *kp;
+	enum status_code prog_status = STATUS_DEAD;
+
+	kd = ssd_kvm_open();
+	kp = ssd_kvm_get_procs(kd, KERN_PROC_ALL, 0, &nentries);
+
+	for (i = 0; i < nentries; i++) {
+		enum status_code pid_status;
+		pid_t pid;
+
+#if defined(OS_FreeBSD)
+		pid = kp[i].ki_pid;
+#elif defined(OS_OpenBSD)
+		pid = kp[i].p_pid;
+#elif defined(OS_DragonFlyBSD)
+		pid = kp[i].kp_pid;
+#else
+		pid = kp[i].kp_proc.p_pid;
+#endif
+
+		pid_status = pid_check(pid);
+		if (pid_status < prog_status)
+			prog_status = pid_status;
+	}
+
+	kvm_close(kd);
+
+	return prog_status;
+}
+#endif
+
+static enum status_code
+do_findprocs(void)
+{
+	pid_list_free(&found);
+
+	if (match_pid > 0)
+		return pid_check(match_pid);
+	else if (pidfile)
+		return do_pidfile(pidfile);
+	else
+		return do_procinit();
+}
+
+static int
+do_start(int argc, char **argv)
+{
+	int devnull_fd = -1;
+	gid_t rgid;
+	uid_t ruid;
+
+	do_findprocs();
+
+	if (found) {
+		info("%s already running.\n", execname ? execname : "process");
+		return exitnodo;
+	}
+	if (testmode && quietmode <= 0) {
+		printf("Would start %s ", startas);
+		while (argc-- > 0)
+			printf("%s ", *argv++);
+		if (changeuser != NULL) {
+			printf(" (as user %s[%d]", changeuser, runas_uid);
+			if (changegroup != NULL)
+				printf(", and group %s[%d])", changegroup, runas_gid);
+			else
+				printf(")");
+		}
+		if (changeroot != NULL)
+			printf(" in directory %s", changeroot);
+		if (nicelevel)
+			printf(", and add %i to the priority", nicelevel);
+		if (proc_sched)
+			printf(", with scheduling policy %s with priority %i",
+			       proc_sched->policy_name, proc_sched->priority);
+		if (io_sched)
+			printf(", with IO scheduling class %s with priority %i",
+			       io_sched->policy_name, io_sched->priority);
+		printf(".\n");
+	}
+	if (testmode)
+		return 0;
+	debug("Starting %s...\n", startas);
+	*--argv = startas;
+	if (background)
+		/* Ok, we need to detach this process. */
+		daemonize();
+	else if (mpidfile && pidfile != NULL)
+		/* User wants _us_ to make the pidfile, but detach themself! */
+		write_pidfile(pidfile, getpid());
+	if (background && close_io) {
+		devnull_fd = open("/dev/null", O_RDWR);
+		if (devnull_fd < 0)
+			fatale("unable to open '%s'", "/dev/null");
+	}
+	if (nicelevel) {
+		errno = 0;
+		if ((nice(nicelevel) == -1) && (errno != 0))
+			fatale("unable to alter nice level by %i", nicelevel);
+	}
+	if (proc_sched)
+		set_proc_schedule(proc_sched);
+	if (io_sched)
+		set_io_schedule(io_sched);
+	if (umask_value >= 0)
+		umask(umask_value);
+	if (changeroot != NULL) {
+		if (chdir(changeroot) < 0)
+			fatale("unable to chdir() to %s", changeroot);
+		if (chroot(changeroot) < 0)
+			fatale("unable to chroot() to %s", changeroot);
+	}
+	if (chdir(changedir) < 0)
+		fatale("unable to chdir() to %s", changedir);
+
+	rgid = getgid();
+	ruid = getuid();
+	if (changegroup != NULL) {
+		if (rgid != (gid_t)runas_gid)
+			if (setgid(runas_gid))
+				fatale("unable to set gid to %d", runas_gid);
+	}
+	if (changeuser != NULL) {
+		/* We assume that if our real user and group are the same as
+		 * the ones we should switch to, the supplementary groups
+		 * will be already in place. */
+		if (rgid != (gid_t)runas_gid || ruid != (uid_t)runas_uid)
+			if (initgroups(changeuser, runas_gid))
+				fatale("unable to set initgroups() with gid %d",
+				      runas_gid);
+
+		if (ruid != (uid_t)runas_uid)
+			if (setuid(runas_uid))
+				fatale("unable to set uid to %s", changeuser);
+	}
+
+	if (background && close_io) {
+		int i;
+
+		dup2(devnull_fd, 0); /* stdin */
+		dup2(devnull_fd, 1); /* stdout */
+		dup2(devnull_fd, 2); /* stderr */
+
+		 /* Now close all extra fds. */
+		for (i = get_open_fd_max() - 1; i >= 3; --i)
+			close(i);
+	}
+	execv(startas, argv);
+	fatale("unable to start %s", startas);
+}
+
+static void
+do_stop(int sig_num, int *n_killed, int *n_notkilled)
+{
+	struct pid_list *p;
+
+	do_findprocs();
+
+	*n_killed = 0;
+	*n_notkilled = 0;
+
+	if (!found)
+		return;
+
+	pid_list_free(&killed);
+
+	for (p = found; p; p = p->next) {
+		if (testmode) {
+			info("Would send signal %d to %d.\n", sig_num, p->pid);
+			(*n_killed)++;
+		} else if (kill(p->pid, sig_num) == 0) {
+			pid_list_push(&killed, p->pid);
+			(*n_killed)++;
+		} else {
+			if (sig_num)
+				warning("failed to kill %d: %s\n",
+				        p->pid, strerror(errno));
+			(*n_notkilled)++;
+		}
+	}
+}
+
+static void
+do_stop_summary(int retry_nr)
+{
+	struct pid_list *p;
+
+	if (quietmode >= 0 || !killed)
+		return;
+
+	printf("Stopped %s (pid", what_stop);
+	for (p = killed; p; p = p->next)
+		printf(" %d", p->pid);
+	putchar(')');
+	if (retry_nr > 0)
+		printf(", retry #%d", retry_nr);
+	printf(".\n");
+}
+
+static void DPKG_ATTR_PRINTF(1)
+set_what_stop(const char *format, ...)
+{
+	va_list arglist;
+	int rc;
+
+	va_start(arglist, format);
+	rc = vasprintf(&what_stop, format, arglist);
+	va_end(arglist);
+
+	if (rc < 0)
+		fatale("cannot allocate formatted string");
+}
+
+/*
+ * We want to keep polling for the processes, to see if they've exited, or
+ * until the timeout expires.
+ *
+ * This is a somewhat complicated algorithm to try to ensure that we notice
+ * reasonably quickly when all the processes have exited, but don't spend
+ * too much CPU time polling. In particular, on a fast machine with
+ * quick-exiting daemons we don't want to delay system shutdown too much,
+ * whereas on a slow one, or where processes are taking some time to exit,
+ * we want to increase the polling interval.
+ *
+ * The algorithm is as follows: we measure the elapsed time it takes to do
+ * one poll(), and wait a multiple of this time for the next poll. However,
+ * if that would put us past the end of the timeout period we wait only as
+ * long as the timeout period, but in any case we always wait at least
+ * MIN_POLL_INTERVAL (20ms). The multiple (‘ratio’) starts out as 2, and
+ * increases by 1 for each poll to a maximum of 10; so we use up to between
+ * 30% and 10% of the machine's resources (assuming a few reasonable things
+ * about system performance).
+ */
+static bool
+do_stop_timeout(int timeout, int *n_killed, int *n_notkilled)
+{
+	struct timespec stopat, before, after, interval, maxinterval;
+	int rc, ratio;
+
+	timespec_gettime(&stopat);
+	stopat.tv_sec += timeout;
+	ratio = 1;
+	for (;;) {
+		timespec_gettime(&before);
+		if (timespec_cmp(&before, &stopat, >))
+			return false;
+
+		do_stop(0, n_killed, n_notkilled);
+		if (!*n_killed)
+			return true;
+
+		timespec_gettime(&after);
+
+		if (!timespec_cmp(&after, &stopat, <))
+			return false;
+
+		if (ratio < 10)
+			ratio++;
+
+		timespec_sub(&stopat, &after, &maxinterval);
+		timespec_sub(&after, &before, &interval);
+		timespec_mul(&interval, ratio);
+
+		if (interval.tv_sec < 0 || interval.tv_nsec < 0)
+			interval.tv_sec = interval.tv_nsec = 0;
+
+		if (timespec_cmp(&interval, &maxinterval, >))
+			interval = maxinterval;
+
+		if (interval.tv_sec == 0 &&
+		    interval.tv_nsec <= MIN_POLL_INTERVAL)
+			interval.tv_nsec = MIN_POLL_INTERVAL;
+
+		rc = pselect(0, NULL, NULL, NULL, &interval, NULL);
+		if (rc < 0 && errno != EINTR)
+			fatale("select() failed for pause");
+	}
+}
+
+static int
+finish_stop_schedule(bool anykilled)
+{
+	if (rpidfile && pidfile && !testmode)
+		remove_pidfile(pidfile);
+
+	if (anykilled)
+		return 0;
+
+	info("No %s found running; none killed.\n", what_stop);
+
+	return exitnodo;
+}
+
+static int
+run_stop_schedule(void)
+{
+	int position, n_killed, n_notkilled, value, retry_nr;
+	bool anykilled;
+
+	if (testmode) {
+		if (schedule != NULL) {
+			info("Ignoring --retry in test mode\n");
+			schedule = NULL;
+		}
+	}
+
+	if (cmdname)
+		set_what_stop("%s", cmdname);
+	else if (execname)
+		set_what_stop("%s", execname);
+	else if (pidfile)
+		set_what_stop("process in pidfile '%s'", pidfile);
+	else if (match_pid > 0)
+		set_what_stop("process with pid %d", match_pid);
+	else if (match_ppid > 0)
+		set_what_stop("process(es) with parent pid %d", match_ppid);
+	else if (userspec)
+		set_what_stop("process(es) owned by '%s'", userspec);
+	else
+		BUG("no match option, please report");
+
+	anykilled = false;
+	retry_nr = 0;
+
+	if (schedule == NULL) {
+		do_stop(signal_nr, &n_killed, &n_notkilled);
+		do_stop_summary(0);
+		if (n_notkilled > 0)
+			info("%d pids were not killed\n", n_notkilled);
+		if (n_killed)
+			anykilled = true;
+		return finish_stop_schedule(anykilled);
+	}
+
+	for (position = 0; position < schedule_length; position++) {
+	reposition:
+		value = schedule[position].value;
+		n_notkilled = 0;
+
+		switch (schedule[position].type) {
+		case sched_goto:
+			position = value;
+			goto reposition;
+		case sched_signal:
+			do_stop(value, &n_killed, &n_notkilled);
+			do_stop_summary(retry_nr++);
+			if (!n_killed)
+				return finish_stop_schedule(anykilled);
+			else
+				anykilled = true;
+			continue;
+		case sched_timeout:
+			if (do_stop_timeout(value, &n_killed, &n_notkilled))
+				return finish_stop_schedule(anykilled);
+			else
+				continue;
+		default:
+			BUG("schedule[%d].type value %d is not valid",
+			    position, schedule[position].type);
+		}
+	}
+
+	info("Program %s, %d process(es), refused to die.\n",
+	     what_stop, n_killed);
+
+	return 2;
+}
+
+int
+main(int argc, char **argv)
+{
+	progname = argv[0];
+
+	parse_options(argc, argv);
+	setup_options();
+
+	argc -= optind;
+	argv += optind;
+
+	if (action == ACTION_START)
+		return do_start(argc, argv);
+	else if (action == ACTION_STOP)
+		return run_stop_schedule();
+	else if (action == ACTION_STATUS)
+		return do_findprocs();
+
+	return 0;
+}