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1/* Copyright (C) 2002-2019 Free Software Foundation, Inc.
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
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <errno.h>
20#include <fcntl.h>
21#include <semaphore.h>
22#include <stdio.h>
23#include <stdlib.h>
24#include <unistd.h>
25
26
27static void
28remove_sem (int status, void *arg)
29{
30 sem_unlink (arg);
31}
32
33
34int
35do_test (void)
36{
37 sem_t *s;
38 sem_t *s2;
39 pid_t pid;
40 int val;
41
42 /* Start with a clean slate and register a clean-up action. No need to
43 act if sem_unlink fails because we will catch the same problem during the
44 sem_open below. */
45 sem_unlink ("/glibc-tst-sem4");
46 on_exit (remove_sem, (void *) "/glibc-tst-sem4");
47
48 s = sem_open ("/glibc-tst-sem4", O_CREAT, 0600, 1);
49 if (s == SEM_FAILED)
50 {
51 if (errno == ENOSYS)
52 {
53 puts ("sem_open not supported. Oh well.");
54 return 0;
55 }
56
57 /* Maybe the shm filesystem has strict permissions. */
58 if (errno == EACCES)
59 {
60 puts ("sem_open not allowed. Oh well.");
61 return 0;
62 }
63
64 printf ("sem_open: %m\n");
65 return 1;
66 }
67
68 /* We have the semaphore object. Now try again with O_EXCL, this
69 should fail. */
70 s2 = sem_open ("/glibc-tst-sem4", O_CREAT | O_EXCL, 0600, 1);
71 if (s2 != SEM_FAILED)
72 {
73 puts ("2nd sem_open didn't fail");
74 return 1;
75 }
76 if (errno != EEXIST)
77 {
78 puts ("2nd sem_open returned wrong error");
79 return 1;
80 }
81
82 /* Check the value. */
83 if (sem_getvalue (s, &val) == -1)
84 {
85 puts ("getvalue failed");
86 return 1;
87 }
88 if (val != 1)
89 {
90 printf ("initial value wrong: got %d, expected 1\n", val);
91 return 1;
92 }
93
94 if (TEMP_FAILURE_RETRY (sem_wait (s)) == -1)
95 {
96 puts ("1st sem_wait failed");
97 return 1;
98 }
99
100 pid = fork ();
101 if (pid == -1)
102 {
103 printf ("fork failed: %m\n");
104 return 1;
105 }
106
107 if (pid == 0)
108 {
109 /* Child. */
110
111 /* Check the value. */
112 if (sem_getvalue (s, &val) == -1)
113 {
114 puts ("child: getvalue failed");
115 return 1;
116 }
117 if (val != 0)
118 {
119 printf ("child: value wrong: got %d, expect 0\n", val);
120 return 1;
121 }
122
123 if (sem_post (s) == -1)
124 {
125 puts ("child: post failed");
126 return 1;
127 }
128 }
129 else
130 {
131 if (TEMP_FAILURE_RETRY (sem_wait (s)) == -1)
132 {
133 puts ("2nd sem_wait failed");
134 return 1;
135 }
136
137 if (sem_getvalue (s, &val) == -1)
138 {
139 puts ("parent: 2nd getvalue failed");
140 return 1;
141 }
142 if (val != 0)
143 {
144 printf ("parent: value wrong: got %d, expected 0\n", val);
145 return 1;
146 }
147 }
148
149 return 0;
150}
151
152#define TEST_FUNCTION do_test ()
153#include "../test-skeleton.c"
154

Warning: That file was not part of the compilation database. It may have many parsing errors.