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2b778ceb | 1 | /* Copyright (C) 2002-2021 Free Software Foundation, Inc. |
76a50749 UD |
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 | |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
76a50749 UD |
18 | |
19 | #include <pthread.h> | |
20 | #include <stdio.h> | |
21 | #include <stdlib.h> | |
22 | #include <unistd.h> | |
23 | #include <sys/file.h> | |
24 | ||
25 | ||
26 | static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; | |
27 | ||
28 | static int fd; | |
29 | ||
30 | ||
31 | static void * | |
32 | tf (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 | ||
46 | static int | |
47 | do_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" |