1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2001
4 * Copyright (C) 2017 Cyril Hrubis <chrubis@suse.cz>
5 * Ported to LTP: Wayne Boyer
6 */
7
8 /*
9 * Check the functionality of the Alarm system call when the time input
10 * parameter is zero.
11 *
12 * Expected Result:
13 * The previously specified alarm request should be cancelled and the
14 * SIGALRM should not be received.
15 */
16
17 #include <stdio.h>
18 #include <unistd.h>
19 #include <sys/types.h>
20 #include <errno.h>
21 #include <string.h>
22 #include <signal.h>
23
24 #include "tst_test.h"
25
26 static volatile int alarms_received = 0;
27
sigproc(int sig)28 static void sigproc(int sig)
29 {
30 if (sig == SIGALRM)
31 alarms_received++;
32 }
33
setup(void)34 static void setup(void)
35 {
36 SAFE_SIGNAL(SIGALRM, sigproc);
37 }
38
verify_alarm(void)39 static void verify_alarm(void)
40 {
41 int ret;
42
43 alarm(2);
44 sleep(1);
45
46 ret = alarm(0);
47
48 /* Wait for signal SIGALRM */
49 sleep(2);
50
51 if (alarms_received)
52 tst_res(TFAIL, "Received %i alarms", alarms_received);
53 else
54 tst_res(TPASS, "Received 0 alarms");
55
56 if (ret == 1)
57 tst_res(TPASS, "alarm(0) returned 1");
58 else
59 tst_res(TFAIL, "alarm(0) returned %i, expected 1", ret);
60 }
61
62 static struct tst_test test = {
63 .setup = setup,
64 .test_all = verify_alarm,
65 };
66