1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved.
4 */
5
6 /*\
7 * [Description]
8 *
9 * Verify that getpid() system call returns process ID in range 2 ... PID_MAX
10 */
11
12 #include <stdlib.h>
13 #include "tst_test.h"
14
verify_getpid(void)15 static void verify_getpid(void)
16 {
17 pid_t pid_max, pid;
18 int i;
19
20 SAFE_FILE_SCANF("/proc/sys/kernel/pid_max", "%d\n", &pid_max);
21
22 for (i = 0; i < 100; i++) {
23 pid = SAFE_FORK();
24 if (pid == 0) {
25 pid = getpid();
26
27 /* pid should not be 1 or out of maximum */
28 if (1 < pid && pid <= pid_max)
29 tst_res(TPASS, "getpid() returns %d", pid);
30 else
31 tst_res(TFAIL,
32 "getpid() returns out of range: %d", pid);
33 exit(0);
34 } else {
35 SAFE_WAIT(NULL);
36 }
37 }
38 }
39
40 static struct tst_test test = {
41 .forks_child = 1,
42 .test_all = verify_getpid,
43 };
44