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
33char *TCID = "pause02";
34int TST_TOTAL = 1;
35static pid_t cpid;
36
37static void do_child(void);
38static void setup(void);
39static void cleanup(void);
40
41int 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
115static void sig_handle(int sig)
116{
117}
118
119static 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
147static void setup(void)
148{
149	tst_sig(FORK, DEF_HANDLER, cleanup);
150
151	TEST_PAUSE;
152}
153
154static void cleanup(void)
155{
156}
157