1 /*
2 * Copyright (c) 2005, Bull S.A.. All rights reserved.
3 * Created by: Sebastien Decugis
4 * Copyright (c) 2013 Cyril Hrubis <chrubis@suse.cz>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of version 2 of the GNU General Public License as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it would be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
17 *
18 * This sample test aims to check the following assertions:
19 *
20 * If the signal action was set with the signal() function, getting it into oact
21 * then reinstalling it with act must be valid.
22 *
23 * The steps are:
24 * -> register a signal handler for SIGINT with signal().
25 * -> check this signal handler works.
26 * -> change the signal handler with sigaction, saving old handler in oact.
27 * -> check the new signal handler works.
28 * -> set the old signal handler back
29 * -> check the old signal handler still works.
30 *
31 * The test fails if a signal handler does not work as expected.
32 */
33
34
35 #include <stdarg.h>
36 #include <stdio.h>
37 #include <stdlib.h>
38 #include <string.h>
39 #include <unistd.h>
40 #include <signal.h>
41 #include <errno.h>
42
43 #include "posixtest.h"
44
45 static volatile sig_atomic_t called = 1;
46
handler_1()47 static void handler_1()
48 {
49 called++;
50 }
51
handler_2()52 static void handler_2()
53 {
54 called--;
55 }
56
main(void)57 int main(void)
58 {
59 int ret;
60
61 struct sigaction sa, save;
62
63 if (signal(SIGINT, handler_1) == SIG_ERR) {
64 perror("Failed to register signal handler");
65 return PTS_UNRESOLVED;
66 }
67
68 /* As whether signal handler is restored to default when executed
69 is implementation defined, we cannot check it was registered here. */
70
71 /* Set the new signal handler with sigaction*/
72 sa.sa_flags = 0;
73
74 sa.sa_handler = handler_2;
75
76 ret = sigemptyset(&sa.sa_mask);
77
78 if (ret != 0) {
79 perror("Failed to empty signal set");
80 return PTS_UNRESOLVED;
81 }
82
83 ret = sigaction(SIGINT, &sa, &save);
84
85 if (ret != 0) {
86 perror("Failed to register signal handler");
87 return PTS_UNRESOLVED;
88 }
89
90 /* Check the signal handler has been set up */
91 ret = raise(SIGINT);
92
93 if (ret != 0) {
94 perror("Failed to raise signal");
95 return PTS_UNRESOLVED;
96 }
97
98 if (called != 0) {
99 fprintf(stderr, "Handler was not executed\n");
100 return PTS_FAIL;
101 }
102
103 /* Restore the first signal handler */
104 ret = sigaction(SIGINT, &save, 0);
105
106 if (ret != 0) {
107 perror("Failed to restore signal handler");
108 return PTS_UNRESOLVED;
109 }
110
111 /* Check the signal handler has been set up */
112 ret = raise(SIGINT);
113
114 if (ret != 0) {
115 perror("Failed to raise signal");
116 return PTS_UNRESOLVED;
117 }
118
119 if (called != 1) {
120 fprintf(stderr, "Handler was not executed\n");
121 return PTS_FAIL;
122 }
123
124 printf("Test PASSED\n");
125 return PTS_PASS;
126 }
127