mirror of
https://sourceware.org/git/glibc.git
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147 lines
3.0 KiB
C
147 lines
3.0 KiB
C
/* Copyright (C) 2002 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>, 2002.
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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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pid_t pid;
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int val;
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s = sem_open ("/glibc-tst-sem4", 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-sem4");
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/* We have the semaphore object. Now try again with O_EXCL, this
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should fail. */
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s2 = sem_open ("/glibc-tst-sem4", O_CREAT | O_EXCL, 0600, 1);
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if (s2 != SEM_FAILED)
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{
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puts ("2nd sem_open didn't fail");
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return 1;
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}
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if (errno != EEXIST)
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{
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puts ("2nd sem_open returned wrong error");
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return 1;
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}
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/* Check the value. */
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if (sem_getvalue (s, &val) == -1)
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{
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puts ("getvalue failed");
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return 1;
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}
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if (val != 1)
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{
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printf ("initial value wrong: got %d, expected 1\n", val);
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return 1;
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}
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if (TEMP_FAILURE_RETRY (sem_wait (s)) == -1)
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{
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puts ("1st sem_wait failed");
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return 1;
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}
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pid = fork ();
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if (pid == -1)
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{
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printf ("fork failed: %m\n");
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return 1;
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}
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if (pid == 0)
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{
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/* Child. */
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/* Check the value. */
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if (sem_getvalue (s, &val) == -1)
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{
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puts ("child: getvalue failed");
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return 1;
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}
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if (val != 0)
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{
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printf ("child: value wrong: got %d, expect 0\n", val);
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return 1;
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}
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if (sem_post (s) == -1)
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{
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puts ("child: post failed");
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return 1;
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}
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}
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else
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{
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if (TEMP_FAILURE_RETRY (sem_wait (s)) == -1)
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{
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puts ("2nd sem_wait failed");
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return 1;
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}
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if (sem_getvalue (s, &val) == -1)
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{
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puts ("parent: 2nd getvalue failed");
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return 1;
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}
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if (val != 0)
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{
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printf ("parent: value wrong: got %d, expected 0\n", val);
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return 1;
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}
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}
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return 0;
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}
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