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glibc/nptl/tst-flock2.c
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/* 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 <pthread.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <unistd.h> | |
#include <sys/file.h> | |
#include <sys/mman.h> | |
#include <sys/wait.h> | |
static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; | |
static pthread_mutex_t lock2 = PTHREAD_MUTEX_INITIALIZER; | |
static int fd; | |
static void * | |
tf (void *arg) | |
{ | |
struct flock fl = | |
{ | |
.l_type = F_WRLCK, | |
.l_start = 0, | |
.l_whence = SEEK_SET, | |
.l_len = 10 | |
}; | |
if (TEMP_FAILURE_RETRY (fcntl (fd, F_SETLKW, &fl)) != 0) | |
{ | |
puts ("fourth fcntl failed"); | |
exit (1); | |
} | |
pthread_mutex_unlock (&lock); | |
pthread_mutex_lock (&lock2); | |
return NULL; | |
} | |
static int | |
do_test (void) | |
{ | |
char tmp[] = "/tmp/tst-flock2-XXXXXX"; | |
fd = mkstemp (tmp); | |
if (fd == -1) | |
{ | |
puts ("mkstemp failed"); | |
return 1; | |
} | |
unlink (tmp); | |
int i; | |
for (i = 0; i < 20; ++i) | |
write (fd, "foobar xyzzy", 12); | |
pthread_barrier_t *b; | |
b = mmap (NULL, sizeof (pthread_barrier_t), PROT_READ | PROT_WRITE, | |
MAP_SHARED, fd, 0); | |
if (b == MAP_FAILED) | |
{ | |
puts ("mmap failed"); | |
return 1; | |
} | |
pthread_barrierattr_t ba; | |
if (pthread_barrierattr_init (&ba) != 0) | |
{ | |
puts ("barrierattr_init failed"); | |
return 1; | |
} | |
if (pthread_barrierattr_setpshared (&ba, PTHREAD_PROCESS_SHARED) != 0) | |
{ | |
puts ("barrierattr_setpshared failed"); | |
return 1; | |
} | |
if (pthread_barrier_init (b, &ba, 2) != 0) | |
{ | |
puts ("barrier_init failed"); | |
return 1; | |
} | |
if (pthread_barrierattr_destroy (&ba) != 0) | |
{ | |
puts ("barrierattr_destroy failed"); | |
return 1; | |
} | |
struct flock fl = | |
{ | |
.l_type = F_WRLCK, | |
.l_start = 0, | |
.l_whence = SEEK_SET, | |
.l_len = 10 | |
}; | |
if (TEMP_FAILURE_RETRY (fcntl (fd, F_SETLKW, &fl)) != 0) | |
{ | |
puts ("first fcntl failed"); | |
return 1; | |
} | |
pid_t pid = fork (); | |
if (pid == -1) | |
{ | |
puts ("fork failed"); | |
return 1; | |
} | |
if (pid == 0) | |
{ | |
/* Make sure the child does not stay around indefinitely. */ | |
alarm (10); | |
/* Try to get the lock. */ | |
if (TEMP_FAILURE_RETRY (fcntl (fd, F_SETLK, &fl)) == 0) | |
{ | |
puts ("child: second flock succeeded"); | |
return 1; | |
} | |
} | |
pthread_barrier_wait (b); | |
if (pid != 0) | |
{ | |
fl.l_type = F_UNLCK; | |
if (TEMP_FAILURE_RETRY (fcntl (fd, F_SETLKW, &fl)) != 0) | |
{ | |
puts ("third fcntl failed"); | |
return 1; | |
} | |
} | |
pthread_barrier_wait (b); | |
pthread_t th; | |
if (pid == 0) | |
{ | |
if (pthread_mutex_lock (&lock) != 0) | |
{ | |
puts ("1st locking of lock failed"); | |
return 1; | |
} | |
if (pthread_mutex_lock (&lock2) != 0) | |
{ | |
puts ("1st locking of lock2 failed"); | |
return 1; | |
} | |
if (pthread_create (&th, NULL, tf, NULL) != 0) | |
{ | |
puts ("pthread_create failed"); | |
return 1; | |
} | |
if (pthread_mutex_lock (&lock) != 0) | |
{ | |
puts ("2nd locking of lock failed"); | |
return 1; | |
} | |
puts ("child locked file"); | |
} | |
pthread_barrier_wait (b); | |
if (pid != 0) | |
{ | |
fl.l_type = F_WRLCK; | |
if (TEMP_FAILURE_RETRY (fcntl (fd, F_SETLK, &fl)) == 0) | |
{ | |
puts ("fifth fcntl succeeded"); | |
return 1; | |
} | |
puts ("file locked by child"); | |
} | |
pthread_barrier_wait (b); | |
if (pid == 0) | |
{ | |
if (pthread_mutex_unlock (&lock2) != 0) | |
{ | |
puts ("unlock of lock2 failed"); | |
return 1; | |
} | |
if (pthread_join (th, NULL) != 0) | |
{ | |
puts ("join failed"); | |
return 1; | |
} | |
puts ("child's thread terminated"); | |
} | |
pthread_barrier_wait (b); | |
if (pid != 0) | |
{ | |
fl.l_type = F_WRLCK; | |
if (TEMP_FAILURE_RETRY (fcntl (fd, F_SETLK, &fl)) == 0) | |
{ | |
puts ("fifth fcntl succeeded"); | |
return 1; | |
} | |
puts ("file still locked"); | |
} | |
pthread_barrier_wait (b); | |
if (pid == 0) | |
{ | |
_exit (0); | |
} | |
int status; | |
if (TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)) != pid) | |
{ | |
puts ("waitpid failed"); | |
return 1; | |
} | |
puts ("child terminated"); | |
if (TEMP_FAILURE_RETRY (fcntl (fd, F_SETLKW, &fl)) != 0) | |
{ | |
puts ("sixth fcntl failed"); | |
return 1; | |
} | |
return status; | |
} | |
#define TEST_FUNCTION do_test () | |
#include "../test-skeleton.c" |