1.\" $NetBSD: sem.4,v 1.3 2005/06/20 13:25:24 peter Exp $ 2.\" 3.\" Copyright (c) 2002 Tim J. Robbins 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25.\" SUCH DAMAGE. 26.\" 27.\" From: FreeBSD: src/share/man/man4/sem.4,v 1.2 2003/06/02 11:19:23 ru 28.\" 29.Dd January 21, 2005 30.Dt SEM 4 31.Os 32.Sh NAME 33.Nm sem 34.Nd POSIX semaphores 35.Sh SYNOPSIS 36To link into the kernel: 37.Bd -ragged -offset indent 38.Cd "options P1003_1B_SEMAPHORE" 39.Ed 40.Sh DESCRIPTION 41The 42.Nm 43facility provides system calls used by the standard C library 44.Pq libc 45to implement 46.Tn POSIX 47semaphores. 48.Sh SEE ALSO 49.Xr config 1 , 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 options 4 57.Sh HISTORY 58The 59.Nm 60facility appeared as a kernel option in 61.Nx 2.0 . 62.Sh BUGS 63The current implementation does not support shared, unnamed semaphores. 64