1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2001
4 * Copyright (c) 2012 Cyril Hrubis <[email protected]>
5 * Copyright (c) Linux Test Project, 2001-2015
6 * Copyright (c) 2023 Ioannis Bonatakis <[email protected]>
7 */
8
9 /*\
10 * [Description]
11 *
12 * Check for ECHILD errno when call wait4(2) with an invalid pid value.
13 */
14
15 #include "tst_test.h"
16 #include <sys/wait.h>
17
18 static pid_t pid_max;
19
run(void)20 static void run(void)
21 {
22 int status;
23 struct rusage rusage;
24
25 TST_EXP_FAIL2(wait4(pid_max + 1, &status, 0, &rusage), ECHILD);
26 }
27
setup(void)28 static void setup(void)
29 {
30 SAFE_FILE_SCANF("/proc/sys/kernel/pid_max", "%d\n", &pid_max);
31 }
32
33 static struct tst_test test = {
34 .test_all = run,
35 .setup = setup,
36 };
37