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026a84a54d
Using write without cheks leads to warn unused result when __wur is enabled. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
93 lines
1.9 KiB
C
93 lines
1.9 KiB
C
/* Copyright (C) 2002-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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<https://www.gnu.org/licenses/>. */
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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 <support/xunistd.h>
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static pthread_mutex_t lock = 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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if (flock (fd, LOCK_SH | LOCK_NB) != 0)
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{
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puts ("second flock failed");
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exit (1);
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}
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pthread_mutex_unlock (&lock);
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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-flock1-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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exit (1);
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}
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unlink (tmp);
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xwrite (fd, "foobar xyzzy", 12);
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if (flock (fd, LOCK_EX | LOCK_NB) != 0)
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{
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puts ("first flock failed");
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exit (1);
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}
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pthread_mutex_lock (&lock);
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pthread_t th;
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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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exit (1);
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}
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pthread_mutex_lock (&lock);
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void *result;
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if (pthread_join (th, &result) != 0)
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{
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puts ("pthread_join failed");
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exit (1);
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}
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close (fd);
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return result != NULL;
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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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