1.\" Copyright (C) 2000 Jason Evans <jasone@FreeBSD.org>. 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(s), this list of conditions and the following disclaimer as 9.\" the first lines of this file unmodified other than the possible 10.\" addition of one or more copyright notices. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice(s), this list of conditions and the following disclaimer in 13.\" the documentation and/or other materials provided with the 14.\" distribution. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY 17.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE 20.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 23.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 24.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 25.\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 26.\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27.\" 28.\" $FreeBSD: src/lib/libc_r/man/sem_open.3,v 1.1.2.6 2001/12/17 10:08:26 ru Exp $ 29.\" $DragonFly: src/lib/libc_r/man/sem_open.3,v 1.2 2003/06/17 04:26:48 dillon Exp $ 30.Dd April 15, 2009 31.Dt SEM_OPEN 3 32.Os 33.Sh NAME 34.Nm sem_open , 35.Nm sem_close , 36.Nm sem_unlink 37.Nd named semaphore operations 38.Sh LIBRARY 39.Lb libpthread 40.Sh SYNOPSIS 41.In semaphore.h 42.Ft sem_t * 43.Fn sem_open "const char *name" "int oflag" "..." 44.Ft int 45.Fn sem_close "sem_t *sem" 46.Ft int 47.Fn sem_unlink "const char *name" 48.Sh DESCRIPTION 49The 50.Fn sem_open , 51.Fn sem_close , 52and 53.Fn sem_unlink 54functions are not supported by this implementation. 55.Sh RETURN VALUES 56.Fn sem_open 57returns SEM_FAILED and sets 58.Va errno 59to indicate an error. 60.Fn sem_close 61and 62.Fn sem_unlink 63return -1 and set 64.Va errno 65to indicate an error. 66.Sh ERRORS 67.Fn sem_open , 68.Fn sem_close , 69and 70.Fn sem_unlink 71will fail: 72.Bl -tag -width Er 73.It Bq Er ENOSYS 74Function not supported by this implementation. 75.El 76.Sh STANDARDS 77.Fn sem_open , 78.Fn sem_close , 79and 80.Fn sem_unlink 81conform to 82.St -p1003.1-96 . 83