Permalink
Cannot retrieve contributors at this time
Name already in use
A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?
glibc/nptl/tst-sem4.c
Go to fileThis commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
153 lines (131 sloc)
3.24 KB
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/* Copyright (C) 2002-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. | |
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 | |
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" |