mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 04:50:07 +00:00
153 lines
3.2 KiB
C
153 lines
3.2 KiB
C
/* Copyright (C) 2002-2023 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
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
|
|
<https://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
|
|
do_test (void)
|
|
{
|
|
sem_t *s;
|
|
sem_t *s2;
|
|
pid_t pid;
|
|
int val;
|
|
|
|
/* Start with a clean slate and register a clean-up action. No need to
|
|
act if sem_unlink fails because we will catch the same problem during the
|
|
sem_open below. */
|
|
sem_unlink ("/glibc-tst-sem4");
|
|
on_exit (remove_sem, (void *) "/glibc-tst-sem4");
|
|
|
|
s = sem_open ("/glibc-tst-sem4", 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;
|
|
}
|
|
|
|
/* We have the semaphore object. Now try again with O_EXCL, this
|
|
should fail. */
|
|
s2 = sem_open ("/glibc-tst-sem4", O_CREAT | O_EXCL, 0600, 1);
|
|
if (s2 != SEM_FAILED)
|
|
{
|
|
puts ("2nd sem_open didn't fail");
|
|
return 1;
|
|
}
|
|
if (errno != EEXIST)
|
|
{
|
|
puts ("2nd sem_open returned wrong error");
|
|
return 1;
|
|
}
|
|
|
|
/* Check the value. */
|
|
if (sem_getvalue (s, &val) == -1)
|
|
{
|
|
puts ("getvalue failed");
|
|
return 1;
|
|
}
|
|
if (val != 1)
|
|
{
|
|
printf ("initial value wrong: got %d, expected 1\n", val);
|
|
return 1;
|
|
}
|
|
|
|
if (TEMP_FAILURE_RETRY (sem_wait (s)) == -1)
|
|
{
|
|
puts ("1st sem_wait failed");
|
|
return 1;
|
|
}
|
|
|
|
pid = fork ();
|
|
if (pid == -1)
|
|
{
|
|
printf ("fork failed: %m\n");
|
|
return 1;
|
|
}
|
|
|
|
if (pid == 0)
|
|
{
|
|
/* Child. */
|
|
|
|
/* Check the value. */
|
|
if (sem_getvalue (s, &val) == -1)
|
|
{
|
|
puts ("child: getvalue failed");
|
|
return 1;
|
|
}
|
|
if (val != 0)
|
|
{
|
|
printf ("child: value wrong: got %d, expect 0\n", val);
|
|
return 1;
|
|
}
|
|
|
|
if (sem_post (s) == -1)
|
|
{
|
|
puts ("child: post failed");
|
|
return 1;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (TEMP_FAILURE_RETRY (sem_wait (s)) == -1)
|
|
{
|
|
puts ("2nd sem_wait failed");
|
|
return 1;
|
|
}
|
|
|
|
if (sem_getvalue (s, &val) == -1)
|
|
{
|
|
puts ("parent: 2nd getvalue failed");
|
|
return 1;
|
|
}
|
|
if (val != 0)
|
|
{
|
|
printf ("parent: value wrong: got %d, expected 0\n", val);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define TEST_FUNCTION do_test ()
|
|
#include "../test-skeleton.c"
|