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