1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2001,2005
4 * Ported to LTP: Wayne Boyer
5 * 06/2005 Test for alarm cleanup by Amos Waterland
6 *
7 * Copyright (c) 2018 Cyril Hrubis <chrubis@suse.cz>
8 */
9
10 /*
11 * Test Description:
12 * The return value of the alarm system call should be equal to the
13 * amount previously remaining in the alarm clock.
14 * A SIGALRM signal should be received after the specified amount of
15 * time has elapsed.
16 */
17
18 #include "tst_test.h"
19
20 static volatile int alarms_fired = 0;
21
run(void)22 static void run(void)
23 {
24 unsigned int ret;
25
26 alarms_fired = 0;
27
28 ret = alarm(10);
29 if (ret)
30 tst_res(TFAIL, "alarm() returned non-zero");
31 else
32 tst_res(TPASS, "alarm() returned zero");
33
34 sleep(1);
35
36 ret = alarm(1);
37 if (ret == 9)
38 tst_res(TPASS, "alarm() returned remainder correctly");
39 else
40 tst_res(TFAIL, "alarm() returned wrong remained %u", ret);
41
42 sleep(2);
43
44 if (alarms_fired == 1)
45 tst_res(TPASS, "alarm handler fired once");
46 else
47 tst_res(TFAIL, "alarm handler filred %u times", alarms_fired);
48 }
49
sighandler(int sig)50 static void sighandler(int sig)
51 {
52 if (sig == SIGALRM)
53 alarms_fired++;
54 }
55
setup(void)56 static void setup(void)
57 {
58 SAFE_SIGNAL(SIGALRM, sighandler);
59 }
60
61 static struct tst_test test = {
62 .test_all = run,
63 .setup = setup,
64 };
65