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/* Copyright (C) 2002-2018 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 <pthread.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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#include <sys/file.h>
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#include <sys/mman.h>
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#include <sys/wait.h>
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static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
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static pthread_mutex_t lock2 = PTHREAD_MUTEX_INITIALIZER;
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static int fd;
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static void *
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tf (void *arg)
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{
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struct flock fl =
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{
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.l_type = F_WRLCK,
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.l_start = 0,
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.l_whence = SEEK_SET,
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.l_len = 10
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};
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if (TEMP_FAILURE_RETRY (fcntl (fd, F_SETLKW, &fl)) != 0)
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{
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puts ("fourth fcntl failed");
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exit (1);
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}
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pthread_mutex_unlock (&lock);
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pthread_mutex_lock (&lock2);
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return NULL;
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}
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static int
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do_test (void)
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{
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char tmp[] = "/tmp/tst-flock2-XXXXXX";
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fd = mkstemp (tmp);
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if (fd == -1)
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{
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puts ("mkstemp failed");
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return 1;
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}
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unlink (tmp);
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int i;
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for (i = 0; i < 20; ++i)
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write (fd, "foobar xyzzy", 12);
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pthread_barrier_t *b;
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b = mmap (NULL, sizeof (pthread_barrier_t), PROT_READ | PROT_WRITE,
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MAP_SHARED, fd, 0);
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if (b == MAP_FAILED)
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{
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puts ("mmap failed");
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return 1;
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}
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pthread_barrierattr_t ba;
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if (pthread_barrierattr_init (&ba) != 0)
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{
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puts ("barrierattr_init failed");
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return 1;
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}
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if (pthread_barrierattr_setpshared (&ba, PTHREAD_PROCESS_SHARED) != 0)
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{
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puts ("barrierattr_setpshared failed");
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return 1;
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}
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if (pthread_barrier_init (b, &ba, 2) != 0)
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{
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puts ("barrier_init failed");
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return 1;
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}
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if (pthread_barrierattr_destroy (&ba) != 0)
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{
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puts ("barrierattr_destroy failed");
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return 1;
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}
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struct flock fl =
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{
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.l_type = F_WRLCK,
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.l_start = 0,
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.l_whence = SEEK_SET,
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.l_len = 10
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};
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if (TEMP_FAILURE_RETRY (fcntl (fd, F_SETLKW, &fl)) != 0)
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{
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puts ("first fcntl failed");
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return 1;
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}
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pid_t pid = fork ();
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if (pid == -1)
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{
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puts ("fork failed");
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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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/* Make sure the child does not stay around indefinitely. */
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alarm (10);
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/* Try to get the lock. */
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if (TEMP_FAILURE_RETRY (fcntl (fd, F_SETLK, &fl)) == 0)
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{
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puts ("child: second flock succeeded");
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return 1;
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}
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}
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pthread_barrier_wait (b);
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if (pid != 0)
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{
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fl.l_type = F_UNLCK;
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if (TEMP_FAILURE_RETRY (fcntl (fd, F_SETLKW, &fl)) != 0)
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{
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puts ("third fcntl failed");
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return 1;
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}
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}
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pthread_barrier_wait (b);
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pthread_t th;
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if (pid == 0)
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{
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if (pthread_mutex_lock (&lock) != 0)
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{
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puts ("1st locking of lock failed");
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return 1;
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}
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if (pthread_mutex_lock (&lock2) != 0)
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{
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puts ("1st locking of lock2 failed");
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return 1;
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}
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if (pthread_create (&th, NULL, tf, NULL) != 0)
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{
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puts ("pthread_create failed");
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return 1;
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}
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if (pthread_mutex_lock (&lock) != 0)
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{
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puts ("2nd locking of lock failed");
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return 1;
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}
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puts ("child locked file");
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}
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pthread_barrier_wait (b);
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if (pid != 0)
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{
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fl.l_type = F_WRLCK;
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if (TEMP_FAILURE_RETRY (fcntl (fd, F_SETLK, &fl)) == 0)
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{
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puts ("fifth fcntl succeeded");
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return 1;
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}
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puts ("file locked by child");
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}
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pthread_barrier_wait (b);
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if (pid == 0)
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{
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if (pthread_mutex_unlock (&lock2) != 0)
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{
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puts ("unlock of lock2 failed");
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return 1;
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}
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if (pthread_join (th, NULL) != 0)
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{
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puts ("join failed");
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return 1;
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}
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puts ("child's thread terminated");
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}
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pthread_barrier_wait (b);
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if (pid != 0)
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{
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fl.l_type = F_WRLCK;
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if (TEMP_FAILURE_RETRY (fcntl (fd, F_SETLK, &fl)) == 0)
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{
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puts ("fifth fcntl succeeded");
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return 1;
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}
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puts ("file still locked");
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}
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pthread_barrier_wait (b);
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if (pid == 0)
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{
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_exit (0);
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}
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int status;
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if (TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)) != pid)
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{
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puts ("waitpid failed");
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return 1;
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}
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puts ("child terminated");
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if (TEMP_FAILURE_RETRY (fcntl (fd, F_SETLKW, &fl)) != 0)
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{
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puts ("sixth fcntl failed");
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return 1;
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}
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return status;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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