1 /*
2  * Copyright (c) International Business Machines  Corp., 2001
3  * Copyright (C) 2017 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 Foundation,
17  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18  */
19 
20 /*
21  * Test Description:
22  *  Check the functionality of the Alarm system call when the time input
23  *  parameter is zero.
24  *
25  * Expected Result:
26  *  The previously specified alarm request should be cancelled and the
27  *  SIGALRM should not be received.
28  *
29  * HISTORY
30  *	07/2001 Ported by Wayne Boyer
31  */
32 
33 #include <stdio.h>
34 #include <unistd.h>
35 #include <sys/types.h>
36 #include <errno.h>
37 #include <string.h>
38 #include <signal.h>
39 
40 #include "tst_test.h"
41 
42 static volatile int alarms_received = 0;
43 
44 static void sigproc(int sig)
45 {
46 	if (sig == SIGALRM)
47 		alarms_received++;
48 }
49 
50 static void setup(void)
51 {
52 	SAFE_SIGNAL(SIGALRM, sigproc);
53 }
54 
55 static void verify_alarm(void)
56 {
57 	int ret;
58 
59 	alarm(2);
60 	sleep(1);
61 
62 	ret = alarm(0);
63 
64 	/* Wait for signal SIGALRM */
65 	sleep(2);
66 
67 	if (alarms_received)
68 		tst_res(TFAIL, "Received %i alarms", alarms_received);
69 	else
70 		tst_res(TPASS, "Received 0 alarms");
71 
72 	if (ret == 1)
73 		tst_res(TPASS, "alarm(0) returned 1");
74 	else
75 		tst_res(TFAIL, "alarm(0) returned %i, expected 1", ret);
76 }
77 
78 static struct tst_test test = {
79 	.setup = setup,
80 	.test_all = verify_alarm,
81 };
82