109 lines
2.4 KiB
C
109 lines
2.4 KiB
C
/* Copyright (C) 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <fcntl.h>
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#include <semaphore.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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static void
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remove_sem (int status, void *arg)
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{
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sem_unlink (arg);
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}
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int
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main (void)
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{
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sem_t *s;
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sem_t *s2;
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sem_t *s3;
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s = sem_open ("/glibc-tst-sem7", O_CREAT, 0600, 1);
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if (s == SEM_FAILED)
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{
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if (errno == ENOSYS)
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{
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puts ("sem_open not supported. Oh well.");
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return 0;
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}
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/* Maybe the shm filesystem has strict permissions. */
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if (errno == EACCES)
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{
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puts ("sem_open not allowed. Oh well.");
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return 0;
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}
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printf ("sem_open: %m\n");
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return 1;
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}
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on_exit (remove_sem, (void *) "/glibc-tst-sem7");
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/* We have the semaphore object. Now try again. We should get the
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same address. */
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s2 = sem_open ("/glibc-tst-sem7", O_CREAT, 0600, 1);
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if (s2 == SEM_FAILED)
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{
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puts ("2nd sem_open failed");
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return 1;
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}
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if (s != s2)
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{
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puts ("2nd sem_open didn't return the same address");
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return 1;
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}
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/* And again, this time without O_CREAT. */
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s3 = sem_open ("/glibc-tst-sem7", 0);
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if (s3 == SEM_FAILED)
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{
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puts ("3rd sem_open failed");
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return 1;
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}
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if (s != s3)
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{
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puts ("3rd sem_open didn't return the same address");
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return 1;
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}
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/* Now close the handle. Three times. */
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if (sem_close (s2) != 0)
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{
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puts ("1st sem_close failed");
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return 1;
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}
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if (sem_close (s) != 0)
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{
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puts ("2nd sem_close failed");
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return 1;
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}
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if (sem_close (s3) != 0)
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{
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puts ("3rd sem_close failed");
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return 1;
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}
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return 0;
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}
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