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688903eb | 1 | /* Copyright (C) 2002-2018 Free Software Foundation, Inc. |
76a50749 UD |
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 | |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
76a50749 UD |
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 | ||
27 | static void | |
28 | remove_sem (int status, void *arg) | |
29 | { | |
30 | sem_unlink (arg); | |
31 | } | |
32 | ||
33 | ||
34 | int | |
bacc75f7 | 35 | do_test (void) |
76a50749 UD |
36 | { |
37 | sem_t *s; | |
38 | sem_t *s2; | |
39 | pid_t pid; | |
40 | int val; | |
41 | ||
045a6bcd TR |
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 | ||
76a50749 UD |
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 | ||
76a50749 UD |
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 | } | |
bacc75f7 SP |
151 | |
152 | #define TEST_FUNCTION do_test () | |
153 | #include "../test-skeleton.c" |