1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) International Business Machines  Corp., 2001
4 * Author: Wayne Boyer
5 * Copyright (c) Linux Test Project, 2002-2022
6 */
7
8/*\
9 * [Description]
10 *
11 * Verify that SIGALRM signal scheduled by alarm() in the parent process
12 * is not delivered to the child process.
13 */
14
15#include <stdlib.h>
16#include "tst_test.h"
17
18static volatile int alarm_cnt;
19
20static void verify_alarm(void)
21{
22	pid_t pid;
23
24	alarm_cnt = 0;
25
26	TST_EXP_PASS_SILENT(alarm(1));
27	pid = SAFE_FORK();
28
29	sleep(3);
30
31	if (pid == 0) {
32		TST_EXP_EQ_LU(alarm_cnt, 0);
33		exit(0);
34	}
35
36	TST_EXP_EQ_LU(alarm_cnt, 1);
37}
38
39static void sighandler(int sig LTP_ATTRIBUTE_UNUSED)
40{
41	alarm_cnt++;
42}
43
44static void setup(void)
45{
46	SAFE_SIGNAL(SIGALRM, sighandler);
47}
48
49static struct tst_test test = {
50	.test_all = verify_alarm,
51	.setup = setup,
52	.forks_child = 1,
53};
54