1.\" Copyright (C) 2000 Jason Evans <jasone@canonware.com>. 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.\" $FreeBSD$ 29.Dd February 15, 2000 30.Dt SEM_OPEN 3 31.Os 32.Sh NAME 33.Nm sem_open , 34.Nm sem_close , 35.Nm sem_unlink 36.Nd named semaphore operations 37.Sh SYNOPSIS 38.Fd #include <semaphore.h> 39.Ft sem_t * 40.Fn sem_open "const char *name" "int oflag" "..." 41.Ft int 42.Fn sem_close "sem_t *sem" 43.Ft int 44.Fn sem_unlink "const char *name" 45.Sh DESCRIPTION 46The 47.Fn sem_open , 48.Fn sem_close , 49and 50.Fn sem_unlink 51functions are not supported by this implementation. 52.Sh RETURN VALUES 53.Fn sem_open 54returns SEM_FAILED and sets 55.Va errno 56to indicate an error. 57.Fn sem_close 58and 59.Fn sem_unlink 60return -1 and set 61.Va errno 62to indicate an error. 63.Sh ERRORS 64.Fn sem_open , 65.Fn sem_close , 66and 67.Fn sem_unlink 68will fail: 69.Bl -tag -width Er 70.It Bq Er ENOSYS 71Function not supported by this implementation. 72.El 73.Sh STANDARDS 74.Fn sem_open , 75.Fn sem_close , 76and 77.Fn sem_unlink 78conform to ISO/IEC 9945-1 ANSI/IEEE 79.Pq Dq Tn POSIX 80Std 1003.1 1996 Edition. 81