1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2001
4 */
5
6 /*\
7 * [Description]
8 *
9 * Check that:
10 *
11 * - fork() in parent returns the same pid as getpid() in child
12 * - getppid() in child returns the same pid as getpid() in parent
13 */
14
15 #include <errno.h>
16
17 #include "tst_test.h"
18
19 static pid_t *child_pid;
20
verify_getpid(void)21 static void verify_getpid(void)
22 {
23 pid_t proc_id;
24 pid_t pid;
25 pid_t pproc_id;
26
27 proc_id = getpid();
28 pid = SAFE_FORK();
29
30 if (pid == 0) {
31 pproc_id = getppid();
32
33 if (pproc_id != proc_id) {
34 tst_res(TFAIL, "child getppid() (%d) != parent getpid() (%d)",
35 pproc_id, proc_id);
36 } else {
37 tst_res(TPASS, "child getppid() == parent getpid() (%d)", proc_id);
38 }
39
40 *child_pid = getpid();
41
42 return;
43 }
44
45 tst_reap_children();
46
47 if (*child_pid != pid)
48 tst_res(TFAIL, "child getpid() (%d) != parent fork() (%d)", *child_pid, pid);
49 else
50 tst_res(TPASS, "child getpid() == parent fork() (%d)", pid);
51 }
52
setup(void)53 static void setup(void)
54 {
55 child_pid = SAFE_MMAP(NULL, sizeof(pid_t), PROT_READ | PROT_WRITE,
56 MAP_ANONYMOUS | MAP_SHARED, -1, 0);
57 }
58
cleanup(void)59 static void cleanup(void)
60 {
61 SAFE_MUNMAP(child_pid, sizeof(pid_t));
62 }
63
64 static struct tst_test test = {
65 .forks_child = 1,
66 .setup = setup,
67 .cleanup = cleanup,
68 .test_all = verify_getpid,
69 };
70