1 /*
2 * Copyright (c) International Business Machines Corp., 2001
3 * Copyright (c) 2012 Cyril Hrubis <chrubis@suse.cz>
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 #ifdef UCLINUX
49 maybe_run_child(&do_child, "");
50 #endif
51
52 setup();
53
54 for (lc = 0; TEST_LOOPING(lc); lc++) {
55 tst_count = 0;
56
57 cpid = FORK_OR_VFORK();
58 switch (cpid) {
59 case -1:
60 tst_brkm(TBROK, cleanup, "fork() failed");
61 break;
62 case 0:
63 #ifdef UCLINUX
64 if (self_exec(av[0], "") < 0)
65 tst_brkm(TBROK, cleanup, "self_exec failed");
66 #else
67 do_child();
68 #endif
69 break;
70 default:
71 break;
72 }
73
74 /*
75 * Wait for child to enter pause().
76 */
77 TST_PROCESS_STATE_WAIT(cleanup, cpid, 'S');
78
79 /*
80 * Send the SIGINT signal now, so that child
81 * returns from pause and resumes execution.
82 */
83 kill(cpid, SIGINT);
84
85 wait(&status);
86
87 if (WIFEXITED(status)) {
88 if (WEXITSTATUS(status) == 0)
89 tst_resm(TPASS, "pause was interrupted correctly");
90 else
91 tst_resm(TFAIL, "pause was interrupted but the "
92 "retval and/or errno was wrong");
93 continue;
94 }
95
96 if (WIFSIGNALED(status)) {
97 switch (WTERMSIG(status)) {
98 case SIGALRM:
99 tst_resm(TFAIL, "Timeout: SIGINT wasn't received by child");
100 break;
101 default:
102 tst_resm(TFAIL, "Child killed by signal");
103 }
104
105 continue;
106 }
107
108 tst_resm(TFAIL, "Pause was not interrupted");
109 }
110
111 cleanup();
112 tst_exit();
113 }
114
sig_handle(int sig)115 static void sig_handle(int sig)
116 {
117 }
118
do_child(void)119 static void do_child(void)
120 {
121 /* avoid LTP framework to do whatever it likes */
122 signal(SIGALRM, SIG_DFL);
123
124 if (signal(SIGINT, sig_handle) == SIG_ERR) {
125 fprintf(stderr, "Child: Failed to setup signal handler\n");
126 exit(1);
127 }
128
129 /* Commit suicide after 10 seconds */
130 alarm(10);
131
132 TEST(pause());
133
134 if (TEST_RETURN == -1) {
135 if (TEST_ERRNO == EINTR)
136 exit(0);
137
138 fprintf(stderr, "Child: Pause returned -1 but errno is %d (%s)\n",
139 TEST_ERRNO, strerror(TEST_ERRNO));
140 exit(1);
141 }
142
143 fprintf(stderr, "Child: Pause returned %ld\n", TEST_RETURN);
144 exit(1);
145 }
146
setup(void)147 static void setup(void)
148 {
149 tst_sig(FORK, DEF_HANDLER, cleanup);
150
151 TEST_PAUSE;
152 }
153
cleanup(void)154 static void cleanup(void)
155 {
156 }
157