1/*
2 * Copyright (C) 2012 Cyril Hrubis <chrubis@suse.cz>
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11 *
12 * Further, this software is distributed without any warranty that it is
13 * free of the rightful claim of any third person regarding infringement
14 * or the like.  Any license provided herein, whether implied or
15 * otherwise, applies only to this software file.  Patent licenses, if
16 * any, provided herein do not apply to combinations of this program with
17 * other software, or any other product whatsoever.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write the Free Software Foundation, Inc.,
21 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
22 */
23
24#include <sys/wait.h>
25
26#include "test.h"
27
28char *TCID = "tst_checkpoint_child";
29int TST_TOTAL = 1;
30
31void handler(int sig LTP_ATTRIBUTE_UNUSED)
32{
33	if (write(2, "Child in sighandler\n", 20)) {
34		/* silence build time warnings */
35	}
36}
37
38int main(void)
39{
40	int pid;
41	volatile int i;
42
43	pid = fork();
44
45	switch (pid) {
46	case -1:
47		tst_brkm(TBROK | TERRNO, NULL, "Fork failed");
48		break;
49	case 0:
50		fprintf(stderr, "Child starts\n");
51
52		signal(SIGALRM, handler);
53
54		for (i = 0; i < 100000000; i++);
55
56		fprintf(stderr, "Child about to sleep\n");
57
58		pause();
59
60		fprintf(stderr, "Child woken up\n");
61
62		return 0;
63		break;
64	default:
65		/* Wait for child to sleep */
66		fprintf(stderr, "Parent waits for child to fall asleep\n");
67		TST_PROCESS_STATE_WAIT(NULL, pid, 'S');
68		fprintf(stderr, "Child sleeping, wake it\n");
69		kill(pid, SIGALRM);
70		break;
71	}
72
73	wait(NULL);
74	return 0;
75}
76