1 /*
2 * Copyright (c) International Business Machines Corp., 2001
3 * Copyright (c) 2012 Cyril Hrubis <[email protected]>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program 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
13 * the GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19
20 /*
21 * Verify that, pause() returns -1 and sets errno to EINTR after receipt of a
22 * signal which is caught by the calling process. Also, verify that the calling
23 * process will resume execution from the point of suspension.
24 */
25
26 #include <unistd.h>
27 #include <errno.h>
28 #include <fcntl.h>
29 #include <sys/wait.h>
30
31 #include "test.h"
32
33 char *TCID = "pause02";
34 int TST_TOTAL = 1;
35 static pid_t cpid;
36
37 static void do_child(void);
38 static void setup(void);
39 static void cleanup(void);
40
main(int ac,char ** av)41 int main(int ac, char **av)
42 {
43 int lc;
44 int status;
45
46 tst_parse_opts(ac, av, NULL, NULL);
47
48 setup();
49
50 for (lc = 0; TEST_LOOPING(lc); lc++) {
51 tst_count = 0;
52
53 cpid = tst_fork();
54 switch (cpid) {
55 case -1:
56 tst_brkm(TBROK, cleanup, "fork() failed");
57 break;
58 case 0:
59 do_child();
60 break;
61 default:
62 break;
63 }
64
65 /*
66 * Wait for child to enter pause().
67 */
68 TST_PROCESS_STATE_WAIT(cleanup, cpid, 'S');
69
70 /*
71 * Send the SIGINT signal now, so that child
72 * returns from pause and resumes execution.
73 */
74 kill(cpid, SIGINT);
75
76 wait(&status);
77
78 if (WIFEXITED(status)) {
79 if (WEXITSTATUS(status) == 0)
80 tst_resm(TPASS, "pause was interrupted correctly");
81 else
82 tst_resm(TFAIL, "pause was interrupted but the "
83 "retval and/or errno was wrong");
84 continue;
85 }
86
87 if (WIFSIGNALED(status)) {
88 switch (WTERMSIG(status)) {
89 case SIGALRM:
90 tst_resm(TFAIL, "Timeout: SIGINT wasn't received by child");
91 break;
92 default:
93 tst_resm(TFAIL, "Child killed by signal");
94 }
95
96 continue;
97 }
98
99 tst_resm(TFAIL, "Pause was not interrupted");
100 }
101
102 cleanup();
103 tst_exit();
104 }
105
sig_handle(int sig)106 static void sig_handle(int sig)
107 {
108 }
109
do_child(void)110 static void do_child(void)
111 {
112 /* avoid LTP framework to do whatever it likes */
113 signal(SIGALRM, SIG_DFL);
114
115 if (signal(SIGINT, sig_handle) == SIG_ERR) {
116 fprintf(stderr, "Child: Failed to setup signal handler\n");
117 exit(1);
118 }
119
120 /* Commit suicide after 10 seconds */
121 alarm(10);
122
123 TEST(pause());
124
125 if (TEST_RETURN == -1) {
126 if (TEST_ERRNO == EINTR)
127 exit(0);
128
129 fprintf(stderr, "Child: Pause returned -1 but errno is %d (%s)\n",
130 TEST_ERRNO, strerror(TEST_ERRNO));
131 exit(1);
132 }
133
134 fprintf(stderr, "Child: Pause returned %ld\n", TEST_RETURN);
135 exit(1);
136 }
137
setup(void)138 static void setup(void)
139 {
140 tst_sig(FORK, DEF_HANDLER, cleanup);
141
142 TEST_PAUSE;
143 }
144
cleanup(void)145 static void cleanup(void)
146 {
147 }
148