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.Dd February 15, 2000 29.Dt SEM_DESTROY 3 30.Os 31.Sh NAME 32.Nm sem_destroy 33.Nd destroy an unnamed semaphore 34.Sh LIBRARY 35.Lb libc 36.Sh SYNOPSIS 37.In semaphore.h 38.Ft int 39.Fn sem_destroy "sem_t *sem" 40.Sh DESCRIPTION 41The 42.Fn sem_destroy 43function destroys the unnamed semaphore pointed to by 44.Fa sem . 45After a successful call to 46.Fn sem_destroy , 47.Fa sem 48is unusable until re-initialized by another call to 49.Xr sem_init 3 . 50.Sh RETURN VALUES 51.Rv -std sem_destroy 52.Sh ERRORS 53The 54.Fn sem_destroy 55function will fail if: 56.Bl -tag -width Er 57.It Bq Er EINVAL 58The 59.Fa sem 60argument 61points to an invalid semaphore. 62.It Bq Er EBUSY 63There are currently threads blocked on the semaphore that 64.Fa sem 65points to. 66.El 67.Sh SEE ALSO 68.Xr sem_init 3 69.Sh STANDARDS 70The 71.Fn sem_destroy 72function conforms to 73.St -p1003.1-96 . 74.Pp 75.Tn POSIX 76does 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