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
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
|
/* Copyright (C) 2003-2013 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
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
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <fcntl.h>
#include <semaphore.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
static void
remove_sem (int status, void *arg)
{
sem_unlink (arg);
}
int
main (void)
{
sem_t *s;
sem_t *s2;
sem_t *s3;
s = sem_open ("/glibc-tst-sem7", O_CREAT, 0600, 1);
if (s == SEM_FAILED)
{
if (errno == ENOSYS)
{
puts ("sem_open not supported. Oh well.");
return 0;
}
/* Maybe the shm filesystem has strict permissions. */
if (errno == EACCES)
{
puts ("sem_open not allowed. Oh well.");
return 0;
}
printf ("sem_open: %m\n");
return 1;
}
on_exit (remove_sem, (void *) "/glibc-tst-sem7");
/* We have the semaphore object. Now try again. We should get the
same address. */
s2 = sem_open ("/glibc-tst-sem7", O_CREAT, 0600, 1);
if (s2 == SEM_FAILED)
{
puts ("2nd sem_open failed");
return 1;
}
if (s != s2)
{
puts ("2nd sem_open didn't return the same address");
return 1;
}
/* And again, this time without O_CREAT. */
s3 = sem_open ("/glibc-tst-sem7", 0);
if (s3 == SEM_FAILED)
{
puts ("3rd sem_open failed");
return 1;
}
if (s != s3)
{
puts ("3rd sem_open didn't return the same address");
return 1;
}
/* Now close the handle. Three times. */
if (sem_close (s2) != 0)
{
puts ("1st sem_close failed");
return 1;
}
if (sem_close (s) != 0)
{
puts ("2nd sem_close failed");
return 1;
}
if (sem_close (s3) != 0)
{
puts ("3rd sem_close failed");
return 1;
}
return 0;
}
|
GitWeb