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1/* Copyright (C) 2002-2019 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <pthread.h>
20#include <stdio.h>
21#include <stdlib.h>
22#include <unistd.h>
23#include <sys/file.h>
24
25
26static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
27
28static int fd;
29
30
31static void *
32tf (void *arg)
33{
34 if (flock (fd, LOCK_SH | LOCK_NB) != 0)
35 {
36 puts ("second flock failed");
37 exit (1);
38 }
39
40 pthread_mutex_unlock (&lock);
41
42 return NULL;
43}
44
45
46static int
47do_test (void)
48{
49 char tmp[] = "/tmp/tst-flock1-XXXXXX";
50
51 fd = mkstemp (tmp);
52 if (fd == -1)
53 {
54 puts ("mkstemp failed");
55 exit (1);
56 }
57
58 unlink (tmp);
59
60 write (fd, "foobar xyzzy", 12);
61
62 if (flock (fd, LOCK_EX | LOCK_NB) != 0)
63 {
64 puts ("first flock failed");
65 exit (1);
66 }
67
68 pthread_mutex_lock (&lock);
69
70 pthread_t th;
71 if (pthread_create (&th, NULL, tf, NULL) != 0)
72 {
73 puts ("pthread_create failed");
74 exit (1);
75 }
76
77 pthread_mutex_lock (&lock);
78
79 void *result;
80 if (pthread_join (th, &result) != 0)
81 {
82 puts ("pthread_join failed");
83 exit (1);
84 }
85
86 close (fd);
87
88 return result != NULL;
89}
90
91#define TEST_FUNCTION do_test ()
92#include "../test-skeleton.c"
93

Warning: That file was not part of the compilation database. It may have many parsing errors.