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📄 Makefile.inc(11.75 KB)
📄 Symbol.map(8.61 KB)
📄 __getosreldate.c(2.34 KB)
📄 __pthread_mutex_init_calloc_cb_stub.c(1.78 KB)
📄 __xuname.c(3.54 KB)
📄 _once_stub.c(2.45 KB)
📄 _pthread_stubs.c(13.83 KB)
📄 _rand48.c(1.37 KB)
📄 _spinlock_stub.c(2.33 KB)
📄 _thread_init.c(1.74 KB)
📄 alarm.3(2.8 KB)
📄 alarm.c(2.1 KB)
📄 arc4random-compat.c(2.35 KB)
📄 arc4random.3(4.78 KB)
📄 arc4random.c(5.87 KB)
📄 arc4random.h(4.11 KB)
📄 arc4random_uniform.c(1.77 KB)
📄 assert.c(2.12 KB)
📄 auxv.3(3.28 KB)
📄 auxv.c(8.11 KB)
📄 basename.3(2.22 KB)
📄 basename.c(1.91 KB)
📄 basename_compat.c(2.18 KB)
📄 cap_rights_get.3(3.53 KB)
📄 cap_sandboxed.3(2.45 KB)
📄 cap_sandboxed.c(1.79 KB)
📄 check_utility_compat.3(2.99 KB)
📄 check_utility_compat.c(2.3 KB)
📄 clock.3(2.59 KB)
📄 clock.c(2.16 KB)
📄 clock_getcpuclockid.3(3.31 KB)
📄 clock_getcpuclockid.c(1.67 KB)
📄 closedir.c(2.38 KB)
📄 confstr.3(3.6 KB)
📄 confstr.c(3.78 KB)
📄 crypt.c(3.13 KB)
📄 ctermid.3(3.03 KB)
📄 ctermid.c(2.21 KB)
📄 daemon.3(3.92 KB)
📄 daemon.c(3.09 KB)
📄 devname-compat11.c(1.79 KB)
📄 devname.3(3.25 KB)
📄 devname.c(2.41 KB)
📄 directory.3(8.7 KB)
📄 dirfd.c(1.62 KB)
📄 dirname.3(2.22 KB)
📄 dirname.c(2.29 KB)
📄 dirname_compat.c(2.05 KB)
📄 disklabel.c(4.86 KB)
📄 dl_iterate_phdr.3(3.27 KB)
📄 dladdr.3(3.92 KB)
📄 dlfcn.c(6.44 KB)
📄 dlinfo.3(7.14 KB)
📄 dllockinit.3(3.9 KB)
📄 dlopen.3(11.35 KB)
📄 drand48.c(605 B)
📄 dup3.3(2.74 KB)
📄 dup3.c(1.96 KB)
📄 elf_utils.c(3.67 KB)
📄 erand48.c(691 B)
📄 err.3(5.79 KB)
📄 err.c(4.35 KB)
📄 errlst.c(8.3 KB)
📄 errno.c(1.45 KB)
📄 eventfd.c(1.79 KB)
📄 exec.3(9.24 KB)
📄 exec.c(7 KB)
📄 exect.c(1.61 KB)
📄 fdevname.c(1.83 KB)
📄 feature_present.3(2.48 KB)
📄 feature_present.c(2.26 KB)
📄 fmtcheck.3(3.27 KB)
📄 fmtcheck.c(6.92 KB)
📄 fmtmsg.3(6.45 KB)
📄 fmtmsg.c(5.86 KB)
📄 fnmatch.3(4.11 KB)
📄 fnmatch.c(8.85 KB)
📄 fpclassify.3(3.11 KB)
📄 fpclassify.c(2.67 KB)
📄 frexp.3(2.76 KB)
📄 frexp.c(1.88 KB)
📄 fstab.c(6.85 KB)
📄 ftok.3(2.71 KB)
📄 ftok.c(1.83 KB)
📄 fts-compat.c(32.07 KB)
📄 fts-compat.h(5.28 KB)
📄 fts-compat11.c(31.65 KB)
📄 fts-compat11.h(3.85 KB)
📄 fts.3(19.27 KB)
📄 fts.c(30.66 KB)
📄 ftw-compat11.c(2.59 KB)
📄 ftw.3(5.7 KB)
📄 ftw.c(2.28 KB)
📄 gen-compat.h(2.35 KB)
📄 gen-private.h(2.64 KB)
📄 getbootfile.3(2.57 KB)
📄 getbootfile.c(2.01 KB)
📄 getbsize.3(3.05 KB)
📄 getbsize.c(3 KB)
📄 getcap.3(14.8 KB)
📄 getcap.c(22.93 KB)
📄 getcontext.3(4.92 KB)
📄 getcwd.3(4.08 KB)
📄 getcwd.c(5.61 KB)
📄 getdiskbyname.3(2.23 KB)
📄 getdomainname.3(2.94 KB)
📄 getdomainname.c(1.98 KB)
📄 getentropy.3(2.05 KB)
📄 getentropy.c(4.09 KB)
📄 getfsent.3(4.54 KB)
📄 getgrent.3(6.7 KB)
📄 getgrent.c(34.33 KB)
📄 getgrouplist.3(2.81 KB)
📄 getgrouplist.c(2.03 KB)
📄 gethostname.3(3.58 KB)
📄 gethostname.c(2.02 KB)
📄 getloadavg.3(2.44 KB)
📄 getloadavg.c(2.39 KB)
📄 getlogin.c(2.65 KB)
📄 getmntinfo-compat11.c(2.61 KB)
📄 getmntinfo.3(3.1 KB)
📄 getmntinfo.c(2.57 KB)
📄 getnetgrent.3(4.02 KB)
📄 getnetgrent.c(24.86 KB)
📄 getosreldate.3(2.48 KB)
📄 getosreldate.c(2.09 KB)
📄 getpagesize.3(2.17 KB)
📄 getpagesize.c(2.46 KB)
📄 getpagesizes.3(2.94 KB)
📄 getpagesizes.c(2.99 KB)
📄 getpass.3(3 KB)
📄 getpeereid.3(3.36 KB)
📄 getpeereid.c(1.95 KB)
📄 getprogname.3(3.1 KB)
📄 getprogname.c(249 B)
📄 getpwent.3(7.67 KB)
📄 getpwent.c(44.7 KB)
📄 getttyent.3(5.75 KB)
📄 getttyent.c(6.7 KB)
📄 getusershell.3(2.86 KB)
📄 getusershell.c(5.74 KB)
📄 getutxent.3(11.32 KB)
📄 getutxent.c(4.89 KB)
📄 getvfsbyname.3(3.44 KB)
📄 getvfsbyname.c(3.1 KB)
📄 glob-compat11.c(25.67 KB)
📄 glob-compat11.h(2.8 KB)
📄 glob.3(10.79 KB)
📄 glob.c(26.49 KB)
📄 initgroups.3(2.62 KB)
📄 initgroups.c(2.33 KB)
📄 isatty.c(1.84 KB)
📄 isgreater.3(2.86 KB)
📄 isinf.c(2.14 KB)
📄 isnan.c(2.36 KB)
📄 jrand48.c(662 B)
📄 lcong48.c(832 B)
📄 ldexp.3(2.47 KB)
📄 ldexp.c(2.89 KB)
📄 libc_dlopen.c(1.88 KB)
📄 lockf.3(7.27 KB)
📄 lockf.c(2.55 KB)
📄 lrand48.c(670 B)
📄 makecontext.3(4.25 KB)
📄 memalign.c(1.63 KB)
📄 modf.3(2.63 KB)
📄 modf.c(2.95 KB)
📄 mrand48.c(709 B)
📄 nftw-compat11.c(2.91 KB)
📄 nftw.c(2.71 KB)
📄 nice.3(2.92 KB)
📄 nice.c(2.14 KB)
📄 nlist.3(2.55 KB)
📄 nlist.c(7.54 KB)
📄 nrand48.c(628 B)
📄 opendir.c(8.52 KB)
📄 pause.3(2.36 KB)
📄 pause.c(2.01 KB)
📄 pmadvise.c(425 B)
📄 popen.3(4.86 KB)
📄 popen.c(6 KB)
📄 posix_spawn.3(14.35 KB)
📄 posix_spawn.c(14.04 KB)
📄 posix_spawn_file_actions_addopen.3(6.28 KB)
📄 posix_spawn_file_actions_init.3(3.78 KB)
📄 posix_spawnattr_getflags.3(3.81 KB)
📄 posix_spawnattr_getpgroup.3(3.45 KB)
📄 posix_spawnattr_getschedparam.3(3.69 KB)
📄 posix_spawnattr_getschedpolicy.3(3.63 KB)
📄 posix_spawnattr_getsigdefault.3(3.65 KB)
📄 posix_spawnattr_getsigmask.3(3.56 KB)
📄 posix_spawnattr_init.3(4.09 KB)
📄 psignal.3(3.18 KB)
📄 psignal.c(2.22 KB)
📄 pututxline.c(7.34 KB)
📄 pw_scan.c(6.3 KB)
📄 pw_scan.h(1.8 KB)
📄 raise.3(2.31 KB)
📄 raise.c(1.96 KB)
📄 rand48.3(4.56 KB)
📄 rand48.h(811 B)
📄 readdir-compat11.c(3.63 KB)
📄 readdir.c(3.91 KB)
📄 readpassphrase.3(4.77 KB)
📄 readpassphrase.c(5.65 KB)
📄 recvmmsg.c(2.83 KB)
📄 rewinddir.c(2.29 KB)
📄 rfork_thread.3(2.7 KB)
📄 scandir-compat11.c(4.89 KB)
📄 scandir.3(3.86 KB)
📄 scandir.c(4.8 KB)
📄 scandir_b.c(1.38 KB)
📄 seed48.c(1 KB)
📄 seekdir.c(2.17 KB)
📄 sem.c(11.4 KB)
📄 sem_destroy.3(2.51 KB)
📄 sem_getvalue.3(2.56 KB)
📄 sem_init.3(2.81 KB)
📄 sem_new.c(9.95 KB)
📄 sem_open.3(5.37 KB)
📄 sem_post.3(2.45 KB)
📄 sem_timedwait.3(5 KB)
📄 sem_wait.3(2.73 KB)
📄 semctl.c(2.67 KB)
📄 sendmmsg.c(2.1 KB)
📄 setdomainname.c(1.97 KB)
📄 sethostname.c(1.96 KB)
📄 setjmp.3(4.48 KB)
📄 setjmperr.c(2.11 KB)
📄 setmode.3(3.56 KB)
📄 setmode.c(11.38 KB)
📄 setproctitle.3(3.54 KB)
📄 setproctitle.c(4.87 KB)
📄 setprogname.c(273 B)
📄 siginterrupt.3(3.74 KB)
📄 siginterrupt.c(2.29 KB)
📄 siglist.c(3.49 KB)
📄 signal.3(9.11 KB)
📄 signal.c(2.17 KB)
📄 sigsetops.3(4.15 KB)
📄 sigsetops.c(3.04 KB)
📄 sleep.3(2.88 KB)
📄 sleep.c(2.61 KB)
📄 srand48.c(859 B)
📄 statvfs.3(4.96 KB)
📄 statvfs.c(3.82 KB)
📄 stringlist.3(3.14 KB)
📄 stringlist.c(2.74 KB)
📄 strtofflags.3(2.96 KB)
📄 strtofflags.c(4.78 KB)
📄 sysconf.3(8.75 KB)
📄 sysconf.c(15.62 KB)
📄 sysctl.3(28.37 KB)
📄 sysctl.c(5.35 KB)
📄 sysctlbyname.c(1.81 KB)
📄 sysctlnametomib.c(2.14 KB)
📄 syslog.3(7.35 KB)
📄 syslog.c(12.21 KB)
📄 tcgetpgrp.3(2.6 KB)
📄 tcgetsid.3(2.24 KB)
📄 tcgetwinsize.3(4.62 KB)
📄 tcsendbreak.3(4.75 KB)
📄 tcsetattr.3(8.86 KB)
📄 tcsetpgrp.3(3.09 KB)
📄 tcsetsid.3(2.83 KB)
📄 telldir.c(5.62 KB)
📄 telldir.h(3.84 KB)
📄 termios.c(5.63 KB)
📄 time.3(2.94 KB)
📄 time.c(1.93 KB)
📄 times.3(3.62 KB)
📄 times.c(2.49 KB)
📄 timespec_get.3(2.52 KB)
📄 timespec_get.c(1.92 KB)
📄 timezone.3(2.29 KB)
📄 timezone.c(3.94 KB)
📄 tls.c(12.39 KB)
📄 trivial-getcontextx.c(1.97 KB)
📄 ttyname.3(3.39 KB)
📄 ttyname.c(3.24 KB)
📄 ttyslot.c(1.8 KB)
📄 tzset.3(7.41 KB)
📄 ualarm.3(2.88 KB)
📄 ualarm.c(2.33 KB)
📄 ucontext.3(3.57 KB)
📄 ulimit.3(2.8 KB)
📄 ulimit.c(2.25 KB)
📄 uname.3(3.14 KB)
📄 uname.c(1.91 KB)
📄 unvis-compat.c(1.89 KB)
📄 usleep.3(2.75 KB)
📄 usleep.c(2.2 KB)
📄 utime.3(2.74 KB)
📄 utime.c(2 KB)
📄 utxdb.c(4.56 KB)
📄 utxdb.h(2.2 KB)
📄 valloc.3(2.37 KB)
📄 valloc.c(1.85 KB)
📄 wait.c(2.1 KB)
📄 wait3.c(2.13 KB)
📄 waitid.c(2.49 KB)
📄 waitpid.c(2.15 KB)
📄 wordexp.3(5.04 KB)
📄 wordexp.c(10.48 KB)

Editing: sem_new.c

/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (C) 2010 David Xu <davidxu@freebsd.org>.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice(s), this list of conditions and the following disclaimer as
 *    the first lines of this file unmodified other than the possible
 *    addition of one or more copyright notices.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice(s), this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * $FreeBSD$
 */

#include "namespace.h"
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <errno.h>
#include <machine/atomic.h>
#include <sys/umtx.h>
#include <limits.h>
#include <fcntl.h>
#include <pthread.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <semaphore.h>
#include <unistd.h>
#include "un-namespace.h"
#include "libc_private.h"

__weak_reference(_sem_close, sem_close);
__weak_reference(_sem_destroy, sem_destroy);
__weak_reference(_sem_getvalue, sem_getvalue);
__weak_reference(_sem_init, sem_init);
__weak_reference(_sem_open, sem_open);
__weak_reference(_sem_post, sem_post);
__weak_reference(_sem_timedwait, sem_timedwait);
__weak_reference(_sem_clockwait_np, sem_clockwait_np);
__weak_reference(_sem_trywait, sem_trywait);
__weak_reference(_sem_unlink, sem_unlink);
__weak_reference(_sem_wait, sem_wait);

#define SEM_PREFIX	"/tmp/SEMD"
#define SEM_MAGIC	((u_int32_t)0x73656d32)

_Static_assert(SEM_VALUE_MAX <= USEM_MAX_COUNT, "SEM_VALUE_MAX too large");

struct sem_nameinfo {
	int open_count;
	char *name;
	dev_t dev;
	ino_t ino;
	sem_t *sem;
	LIST_ENTRY(sem_nameinfo) next;
};

static pthread_once_t once = PTHREAD_ONCE_INIT;
static pthread_mutex_t sem_llock;
static LIST_HEAD(, sem_nameinfo) sem_list = LIST_HEAD_INITIALIZER(sem_list);

static void
sem_prefork(void)
{
	
	_pthread_mutex_lock(&sem_llock);
}

static void
sem_postfork(void)
{

_pthread_mutex_unlock(&sem_llock);
}

static void
sem_child_postfork(void)
{

_pthread_mutex_unlock(&sem_llock);
}

static void
sem_module_init(void)
{

_pthread_mutex_init(&sem_llock, NULL);
	_pthread_atfork(sem_prefork, sem_postfork, sem_child_postfork);
}

static inline int
sem_check_validity(sem_t *sem)
{

if (sem->_magic == SEM_MAGIC)
		return (0);
	errno = EINVAL;
	return (-1);
}

int
_sem_init(sem_t *sem, int pshared, unsigned int value)
{

if (value > SEM_VALUE_MAX) {
		errno = EINVAL;
		return (-1);
	}
 
	bzero(sem, sizeof(sem_t));
	sem->_magic = SEM_MAGIC;
	sem->_kern._count = (u_int32_t)value;
	sem->_kern._flags = pshared ? USYNC_PROCESS_SHARED : 0;
	return (0);
}

sem_t *
_sem_open(const char *name, int flags, ...)
{
	char path[PATH_MAX];
	struct stat sb;
	va_list ap;
	struct sem_nameinfo *ni;
	sem_t *sem, tmp;
	int errsave, fd, len, mode, value;

ni = NULL;
	sem = NULL;
	fd = -1;
	value = 0;

if (name[0] != '/') {
		errno = EINVAL;
		return (SEM_FAILED);
	}
	name++;
	strcpy(path, SEM_PREFIX);
	if (strlcat(path, name, sizeof(path)) >= sizeof(path)) {
		errno = ENAMETOOLONG;
		return (SEM_FAILED);
	}
	if (flags & ~(O_CREAT|O_EXCL)) {
		errno = EINVAL;
		return (SEM_FAILED);
	}
	if ((flags & O_CREAT) != 0) {
		va_start(ap, flags);
		mode = va_arg(ap, int);
		value = va_arg(ap, int);
		va_end(ap);
	}
	fd = -1;
	_pthread_once(&once, sem_module_init);

_pthread_mutex_lock(&sem_llock);
	LIST_FOREACH(ni, &sem_list, next) {
		if (ni->name != NULL && strcmp(name, ni->name) == 0) {
			fd = _open(path, flags | O_RDWR | O_CLOEXEC |
			    O_EXLOCK, mode);
			if (fd == -1 || _fstat(fd, &sb) == -1) {
				ni = NULL;
				goto error;
			}
			if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT |
			    O_EXCL) || ni->dev != sb.st_dev ||
			    ni->ino != sb.st_ino) {
				ni->name = NULL;
				ni = NULL;
				break;
			}
			ni->open_count++;
			sem = ni->sem;
			_pthread_mutex_unlock(&sem_llock);
			_close(fd);
			return (sem);
		}
	}

len = sizeof(*ni) + strlen(name) + 1;
	ni = (struct sem_nameinfo *)malloc(len);
	if (ni == NULL) {
		errno = ENOSPC;
		goto error;
	}

ni->name = (char *)(ni+1);
	strcpy(ni->name, name);

if (fd == -1) {
		fd = _open(path, flags | O_RDWR | O_CLOEXEC | O_EXLOCK, mode);
		if (fd == -1 || _fstat(fd, &sb) == -1)
			goto error;
	}
	if (sb.st_size < sizeof(sem_t)) {
		tmp._magic = SEM_MAGIC;
		tmp._kern._count = value;
		tmp._kern._flags = USYNC_PROCESS_SHARED | SEM_NAMED;
		if (_write(fd, &tmp, sizeof(tmp)) != sizeof(tmp))
			goto error;
	}
	flock(fd, LOCK_UN);
	sem = mmap(NULL, sizeof(sem_t), PROT_READ | PROT_WRITE,
	    MAP_SHARED | MAP_NOSYNC, fd, 0);
	if (sem == MAP_FAILED) {
		sem = NULL;
		if (errno == ENOMEM)
			errno = ENOSPC;
		goto error;
	}
	if (sem->_magic != SEM_MAGIC) {
		errno = EINVAL;
		goto error;
	}
	ni->open_count = 1;
	ni->sem = sem;
	ni->dev = sb.st_dev;
	ni->ino = sb.st_ino;
	LIST_INSERT_HEAD(&sem_list, ni, next);
	_close(fd);
	_pthread_mutex_unlock(&sem_llock);
	return (sem);

error:
	errsave = errno;
	if (fd != -1)
		_close(fd);
	if (sem != NULL)
		munmap(sem, sizeof(sem_t));
	free(ni);
	_pthread_mutex_unlock(&sem_llock);
	errno = errsave;
	return (SEM_FAILED);
}

int
_sem_close(sem_t *sem)
{
	struct sem_nameinfo *ni;
	bool last;

if (sem_check_validity(sem) != 0)
		return (-1);

if (!(sem->_kern._flags & SEM_NAMED)) {
		errno = EINVAL;
		return (-1);
	}

_pthread_once(&once, sem_module_init);

_pthread_mutex_lock(&sem_llock);
	LIST_FOREACH(ni, &sem_list, next) {
		if (sem == ni->sem) {
			last = --ni->open_count == 0;
			if (last)
				LIST_REMOVE(ni, next);
			_pthread_mutex_unlock(&sem_llock);
			if (last) {
				munmap(sem, sizeof(*sem));
				free(ni);
			}
			return (0);
		}
	}
	_pthread_mutex_unlock(&sem_llock);
	errno = EINVAL;
	return (-1);
}

int
_sem_unlink(const char *name)
{
	char path[PATH_MAX];

if (name[0] != '/') {
		errno = ENOENT;
		return -1;
	}
	name++;
	strcpy(path, SEM_PREFIX);
	if (strlcat(path, name, sizeof(path)) >= sizeof(path)) {
		errno = ENAMETOOLONG;
		return (-1);
	}

return (unlink(path));
}

int
_sem_destroy(sem_t *sem)
{

if (sem_check_validity(sem) != 0)
		return (-1);

if (sem->_kern._flags & SEM_NAMED) {
		errno = EINVAL;
		return (-1);
	}
	sem->_magic = 0;
	return (0);
}

int
_sem_getvalue(sem_t * __restrict sem, int * __restrict sval)
{

if (sem_check_validity(sem) != 0)
		return (-1);

*sval = (int)USEM_COUNT(sem->_kern._count);
	return (0);
}

static __inline int
usem_wake(struct _usem2 *sem)
{

return (_umtx_op(sem, UMTX_OP_SEM2_WAKE, 0, NULL, NULL));
}

static __inline int
usem_wait(struct _usem2 *sem, clockid_t clock_id, int flags,
    const struct timespec *rqtp, struct timespec *rmtp)
{
	struct {
		struct _umtx_time timeout;
		struct timespec remain;
	} tms;
	void *tm_p;
	size_t tm_size;
	int retval;

if (rqtp == NULL) {
		tm_p = NULL;
		tm_size = 0;
	} else {
		tms.timeout._clockid = clock_id;
		tms.timeout._flags = (flags & TIMER_ABSTIME) ? UMTX_ABSTIME : 0;
		tms.timeout._timeout = *rqtp;
		tm_p = &tms;
		tm_size = sizeof(tms);
	}
	retval = _umtx_op(sem, UMTX_OP_SEM2_WAIT, 0, (void *)tm_size, tm_p);
	if (retval == -1 && errno == EINTR && (flags & TIMER_ABSTIME) == 0 &&
	    rqtp != NULL && rmtp != NULL) {
		*rmtp = tms.remain;
	}

return (retval);
}

int
_sem_trywait(sem_t *sem)
{
	int val;

if (sem_check_validity(sem) != 0)
		return (-1);

while (USEM_COUNT(val = sem->_kern._count) > 0) {
		if (atomic_cmpset_acq_int(&sem->_kern._count, val, val - 1))
			return (0);
	}
	errno = EAGAIN;
	return (-1);
}

int
_sem_clockwait_np(sem_t * __restrict sem, clockid_t clock_id, int flags,
	const struct timespec *rqtp, struct timespec *rmtp)
{
	int val, retval;

if (sem_check_validity(sem) != 0)
		return (-1);

retval = 0;
	_pthread_testcancel();
	for (;;) {
		while (USEM_COUNT(val = sem->_kern._count) > 0) {
			if (atomic_cmpset_acq_int(&sem->_kern._count, val,
			    val - 1))
				return (0);
		}

if (retval) {
			_pthread_testcancel();
			break;
		}

/*
		 * The timeout argument is only supposed to
		 * be checked if the thread would have blocked.
		 */
		if (rqtp != NULL) {
			if (rqtp->tv_nsec >= 1000000000 || rqtp->tv_nsec < 0) {
				errno = EINVAL;
				return (-1);
			}
		}
		_pthread_cancel_enter(1);
		retval = usem_wait(&sem->_kern, clock_id, flags, rqtp, rmtp);
		_pthread_cancel_leave(0);
	}
	return (retval);
}

int
_sem_timedwait(sem_t * __restrict sem,
	const struct timespec * __restrict abstime)
{

return (_sem_clockwait_np(sem, CLOCK_REALTIME, TIMER_ABSTIME, abstime,
	    NULL));
};

int
_sem_wait(sem_t *sem)
{

return (_sem_timedwait(sem, NULL));
}

/*
 * POSIX:
 * The sem_post() interface is reentrant with respect to signals and may be
 * invoked from a signal-catching function. 
 * The implementation does not use lock, so it should be safe.
 */
int
_sem_post(sem_t *sem)
{
	unsigned int count;

if (sem_check_validity(sem) != 0)
		return (-1);

do {
		count = sem->_kern._count;
		if (USEM_COUNT(count) + 1 > SEM_VALUE_MAX) {
			errno = EOVERFLOW;
			return (-1);
		}
	} while (!atomic_cmpset_rel_int(&sem->_kern._count, count, count + 1));
	if (count & USEM_HAS_WAITERS)
		usem_wake(&sem->_kern);
	return (0);
}

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