1.\" $OpenBSD: sem_destroy.3,v 1.4 2005/07/14 14:10:50 jmc Exp $ 2.\" 3.\" Copyright (C) 2000 Jason Evans <jasone@FreeBSD.org>. 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(s), this list of conditions and the following disclaimer as 11.\" the first lines of this file unmodified other than the possible 12.\" addition of one or more copyright notices. 13.\" 2. Redistributions in binary form must reproduce the above copyright 14.\" notice(s), this list of conditions and the following disclaimer in 15.\" the documentation and/or other materials provided with the 16.\" distribution. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY 19.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE 22.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 25.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 26.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 27.\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 28.\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29.\" 30.\" $FreeBSD: src/lib/libc_r/man/sem_destroy.3,v 1.9 2001/10/01 16:09:09 ru Exp $ 31.Dd February 15, 2000 32.Dt SEM_DESTROY 3 33.Os 34.Sh NAME 35.Nm sem_destroy 36.Nd destroy an unnamed semaphore 37.Sh SYNOPSIS 38.Fd #include <semaphore.h> 39.Ft int 40.Fn sem_destroy "sem_t *sem" 41.Sh DESCRIPTION 42The 43.Fn sem_destroy 44function destroys the unnamed semaphore pointed to by 45.Fa sem . 46After a successful call to 47.Fn sem_destroy , 48.Fa sem 49is unusable until re-initialized by another call to 50.Fn sem_init . 51.Sh RETURN VALUES 52.Rv -std sem_destroy 53.Sh ERRORS 54.Fn sem_destroy 55will fail if: 56.Bl -tag -width Er 57.It Bq Er EINVAL 58.Fa sem 59points to an invalid semaphore. 60.It Bq Er EBUSY 61There are currently threads blocked on the semaphore that 62.Fa sem 63points to. 64.El 65.Sh SEE ALSO 66.Xr sem_getvalue 3 , 67.Xr sem_init 3 , 68.Xr sem_open 3 , 69.Xr sem_post 3 , 70.Xr sem_wait 3 71.Sh STANDARDS 72.Fn sem_destroy 73conforms to 74.St -p1003.1-96 . 75.Pp 76POSIX does not define the behavior of 77.Fn sem_destroy 78if called while there are threads blocked on 79.Fa sem , 80but this implementation is guaranteed to return -1 and set 81.Va errno 82to 83.Er EBUSY 84if there are threads blocked on 85.Fa sem . 86