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
28 char *TCID = "tst_checkpoint_child";
29 int TST_TOTAL = 1;
30
handler(int sig LTP_ATTRIBUTE_UNUSED)31 void handler(int sig LTP_ATTRIBUTE_UNUSED)
32 {
33 if (write(2, "Child in sighandler\n", 20)) {
34 /* silence build time warnings */
35 }
36 }
37
main(void)38 int 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