1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
4 * Author: Billy Jean Horne
5 * Copyright (c) Linux Test Project, 2009-2022
6 */
7
8/*\
9 * [Description]
10 *
11 * Verify that alarm() returns:
12 *
13 * - zero when there was no previously scheduled alarm
14 * - number of seconds remaining until any previously scheduled alarm
15 */
16
17#include "tst_test.h"
18
19static volatile int alarms_received;
20
21static struct tcase {
22	char *str;
23	unsigned int sec;
24} tcases[] = {
25	{"INT_MAX", INT_MAX},
26	{"UINT_MAX/2", UINT_MAX/2},
27	{"UINT_MAX/4", UINT_MAX/4},
28};
29
30static void verify_alarm(unsigned int n)
31{
32	struct tcase *tc = &tcases[n];
33
34	alarms_received = 0;
35
36	TST_EXP_PASS(alarm(tc->sec), "alarm(%u)", tc->sec);
37
38	TST_EXP_VAL(alarm(0), tc->sec);
39
40	if (alarms_received == 1) {
41		tst_res(TFAIL, "alarm(%u) delivered SIGALRM for seconds value %s",
42				tc->sec, tc->str);
43	}
44}
45
46static void sighandler(int sig)
47{
48	if (sig == SIGALRM)
49		alarms_received++;
50}
51
52static void setup(void)
53{
54	SAFE_SIGNAL(SIGALRM, sighandler);
55}
56
57static struct tst_test test = {
58	.tcnt = ARRAY_SIZE(tcases),
59	.test = verify_alarm,
60	.setup = setup,
61};
62