1/* Copyright (C) 2003-2024 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 <errno.h>
19#include <fcntl.h>
20#include <semaphore.h>
21#include <stdio.h>
22#include <stdlib.h>
23#include <unistd.h>
24
25
26static void
27remove_sem (int status, void *arg)
28{
29 sem_unlink (name: arg);
30}
31
32
33static int
34do_test (void)
35{
36 sem_t *s;
37 sem_t *s2;
38 sem_t *s3;
39
40 s = sem_open (name: "/glibc-tst-sem7", O_CREAT, 0600, 1);
41 if (s == SEM_FAILED)
42 {
43 if (errno == ENOSYS)
44 {
45 puts (s: "sem_open not supported. Oh well.");
46 return 0;
47 }
48
49 /* Maybe the shm filesystem has strict permissions. */
50 if (errno == EACCES)
51 {
52 puts (s: "sem_open not allowed. Oh well.");
53 return 0;
54 }
55
56 printf (format: "sem_open: %m\n");
57 return 1;
58 }
59
60 on_exit (func: remove_sem, arg: (void *) "/glibc-tst-sem7");
61
62 /* We have the semaphore object. Now try again. We should get the
63 same address. */
64 s2 = sem_open (name: "/glibc-tst-sem7", O_CREAT, 0600, 1);
65 if (s2 == SEM_FAILED)
66 {
67 puts (s: "2nd sem_open failed");
68 return 1;
69 }
70 if (s != s2)
71 {
72 puts (s: "2nd sem_open didn't return the same address");
73 return 1;
74 }
75
76 /* And again, this time without O_CREAT. */
77 s3 = sem_open (name: "/glibc-tst-sem7", oflag: 0);
78 if (s3 == SEM_FAILED)
79 {
80 puts (s: "3rd sem_open failed");
81 return 1;
82 }
83 if (s != s3)
84 {
85 puts (s: "3rd sem_open didn't return the same address");
86 return 1;
87 }
88
89 /* Now close the handle. Three times. */
90 if (sem_close (sem: s2) != 0)
91 {
92 puts (s: "1st sem_close failed");
93 return 1;
94 }
95 if (sem_close (sem: s) != 0)
96 {
97 puts (s: "2nd sem_close failed");
98 return 1;
99 }
100 if (sem_close (sem: s3) != 0)
101 {
102 puts (s: "3rd sem_close failed");
103 return 1;
104 }
105
106 return 0;
107}
108
109#define TEST_FUNCTION do_test ()
110#include "../test-skeleton.c"
111

source code of glibc/sysdeps/pthread/tst-sem7.c