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_DESTROY 3 31.Os 32.Sh NAME 33.Nm sem_destroy 34.Nd destroy an unnamed semaphore 35.Sh SYNOPSIS 36.Fd #include <semaphore.h> 37.Ft int 38.Fn sem_destroy "sem_t *sem" 39.Sh DESCRIPTION 40The 41.Fn sem_destroy 42function destroys the unnamed semaphore pointed to by 43.Fa sem . 44After a successful call to 45.Fn sem_destroy , 46.Fa sem 47is unuseable until re-initialized by another call to 48.Fn sem_init . 49.Sh RETURN VALUES 50If successful, 51.Fn sem_destroy 52returns 0. Otherwise, -1 is returned and 53.Va errno 54is set to indicate the type of 55error. 56.Sh ERRORS 57.Fn sem_destroy 58will fail if: 59.Bl -tag -width Er 60.It Bq Er EINVAL 61.Fa sem 62points to an invalid semaphore. 63.It Bq Er EBUSY 64There are currently threads blocked on the semaphore that 65.Fa sem 66points to. 67.El 68.Sh SEE ALSO 69.Xr sem_init 3 70.Sh STANDARDS 71.Fn sem_destroy 72conforms to ISO/IEC 9945-1 ANSI/IEEE 73.Pq Dq Tn POSIX 74Std 1003.1 1996 Edition. 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 EBUSY if there are threads blocked on 83.Fa sem . 84