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.Dd February 7, 2014 26.Dt SEM 4 27.Os 28.Sh NAME 29.Nm sem 30.Nd POSIX semaphores 31.Sh SYNOPSIS 32To compile this driver into the kernel, 33place the following line in your 34kernel configuration file: 35.Bd -ragged -offset indent 36.Cd "options P1003_1B_SEMAPHORES" 37.Ed 38.Pp 39Alternatively, to load the driver as a 40module at boot time, place the following line in 41.Xr loader.conf 5 : 42.Bd -literal -offset indent 43sem_load="YES" 44.Ed 45.Pp 46To load the driver as a module at run-time, run the following 47command as root: 48.Bd -ragged -offset indent 49kldload sem 50.Ed 51.Sh DESCRIPTION 52The 53.Nm 54facility provides system calls used by the standard C library 55.Pq Pa libc 56to implement 57.Tn POSIX 58semaphores. 59This facility offers support for such functions as 60.Fn sem_init 61and 62.Fn sem_wait . 63It is available both as a kernel option for static inclusion and as a 64dynamic kernel module. 65.Sh SEE ALSO 66.Xr sem_destroy 3 , 67.Xr sem_getvalue 3 , 68.Xr sem_init 3 , 69.Xr sem_open 3 , 70.Xr sem_post 3 , 71.Xr sem_wait 3 , 72.Xr config 8 , 73.Xr kldload 8 , 74.Xr kldunload 8 75.Sh HISTORY 76The 77.Nm 78facility appeared in 79.Fx 5.0 . 80