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.\" $FreeBSD$ 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 LIBRARY 38.Lb libc_r 39.Sh SYNOPSIS 40.Fd #include <semaphore.h> 41.Ft sem_t * 42.Fn sem_open "const char *name" "int oflag" "..." 43.Ft int 44.Fn sem_close "sem_t *sem" 45.Ft int 46.Fn sem_unlink "const char *name" 47.Sh DESCRIPTION 48The 49.Fn sem_open , 50.Fn sem_close , 51and 52.Fn sem_unlink 53functions are not supported by this implementation. 54.Sh RETURN VALUES 55.Fn sem_open 56returns SEM_FAILED and sets 57.Va errno 58to indicate an error. 59.Fn sem_close 60and 61.Fn sem_unlink 62return -1 and set 63.Va errno 64to indicate an error. 65.Sh ERRORS 66.Fn sem_open , 67.Fn sem_close , 68and 69.Fn sem_unlink 70will fail: 71.Bl -tag -width Er 72.It Bq Er ENOSYS 73Function not supported by this implementation. 74.El 75.Sh STANDARDS 76.Fn sem_open , 77.Fn sem_close , 78and 79.Fn sem_unlink 80conform to 81.St -p1003.1-96 . 82