about summary refs log tree commit diff
path: root/sysdeps/pthread/tst-flock1.c
blob: 7eef9070ab514afa414b4de537c160aa9c4d6680 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
/* Copyright (C) 2002-2023 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/file.h>


static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;

static int fd;


static void *
tf (void *arg)
{
  if (flock (fd, LOCK_SH | LOCK_NB) != 0)
    {
      puts ("second flock failed");
      exit (1);
    }

  pthread_mutex_unlock (&lock);

  return NULL;
}


static int
do_test (void)
{
  char tmp[] = "/tmp/tst-flock1-XXXXXX";

  fd = mkstemp (tmp);
  if (fd == -1)
    {
      puts ("mkstemp failed");
      exit (1);
    }

  unlink (tmp);

  write (fd, "foobar xyzzy", 12);

  if (flock (fd, LOCK_EX | LOCK_NB) != 0)
    {
      puts ("first flock failed");
      exit (1);
    }

  pthread_mutex_lock (&lock);

  pthread_t th;
  if (pthread_create (&th, NULL, tf, NULL) != 0)
    {
      puts ("pthread_create failed");
      exit (1);
    }

  pthread_mutex_lock (&lock);

  void *result;
  if (pthread_join (th, &result) != 0)
    {
      puts ("pthread_join failed");
      exit (1);
    }

  close (fd);

  return result != NULL;
}

#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"