1.\" Copyright (c) 2002 Tim J. Robbins 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD$ 26.\" 27.Dd January 14, 2003 28.Dt SEM 4 29.Os 30.Sh NAME 31.Nm sem 32.Nd POSIX semaphores 33.Sh SYNOPSIS 34To link into the kernel: 35.Cd "options P1003_1B_SEMAPHORES" 36.Pp 37To load as a kernel loadable module: 38.Dl kldload sem 39.Sh DESCRIPTION 40The 41.Nm 42facility provides system calls used by the C library 43.Pq Pa libc 44to implement 45.Tn POSIX 46semaphores. 47It is available both as a kernel option for static inclusion and as a 48dynamic kernel module. 49.Sh SEE ALSO 50.Xr sem_destroy 3 , 51.Xr sem_getvalue 3 , 52.Xr sem_init 3 , 53.Xr sem_open 3 , 54.Xr sem_post 3 , 55.Xr sem_wait 3 , 56.Xr config 8 , 57.Xr kldload 8 , 58.Xr kldunload 8 59.Sh HISTORY 60The 61.Nm 62facility appeared as a kernel option in 63.Fx 3.0 . 64The 65.Nm 66kernel module appeared in 67.Fx 5.0 . 68