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
19 static volatile int alarms_received;
20
21 static 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
verify_alarm(unsigned int n)30 static 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
sighandler(int sig)46 static void sighandler(int sig)
47 {
48 if (sig == SIGALRM)
49 alarms_received++;
50 }
51
setup(void)52 static void setup(void)
53 {
54 SAFE_SIGNAL(SIGALRM, sighandler);
55 }
56
57 static struct tst_test test = {
58 .tcnt = ARRAY_SIZE(tcases),
59 .test = verify_alarm,
60 .setup = setup,
61 };
62