1 | /* Copyright (C) 2002-2024 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <pthread.h> |
19 | #include <stdio.h> |
20 | #include <stdlib.h> |
21 | #include <unistd.h> |
22 | #include <sys/file.h> |
23 | |
24 | #include <support/xunistd.h> |
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: fd, LOCK_SH | LOCK_NB) != 0) |
35 | { |
36 | puts (s: "second flock failed" ); |
37 | exit (1); |
38 | } |
39 | |
40 | pthread_mutex_unlock (mutex: &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 (template: tmp); |
52 | if (fd == -1) |
53 | { |
54 | puts (s: "mkstemp failed" ); |
55 | exit (1); |
56 | } |
57 | |
58 | unlink (name: tmp); |
59 | |
60 | xwrite (fd, "foobar xyzzy" , 12); |
61 | |
62 | if (flock (fd: fd, LOCK_EX | LOCK_NB) != 0) |
63 | { |
64 | puts (s: "first flock failed" ); |
65 | exit (1); |
66 | } |
67 | |
68 | pthread_mutex_lock (mutex: &lock); |
69 | |
70 | pthread_t th; |
71 | if (pthread_create (newthread: &th, NULL, start_routine: tf, NULL) != 0) |
72 | { |
73 | puts (s: "pthread_create failed" ); |
74 | exit (1); |
75 | } |
76 | |
77 | pthread_mutex_lock (mutex: &lock); |
78 | |
79 | void *result; |
80 | if (pthread_join (th: th, thread_return: &result) != 0) |
81 | { |
82 | puts (s: "pthread_join failed" ); |
83 | exit (1); |
84 | } |
85 | |
86 | close (fd: fd); |
87 | |
88 | return result != NULL; |
89 | } |
90 | |
91 | #define TEST_FUNCTION do_test () |
92 | #include "../test-skeleton.c" |
93 | |