1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2001
4 * Copyright (c) 2024 SUSE LLC <[email protected]>
5 */
6
7 /*\
8 * [Description]
9 *
10 * Check that waitpid() returns the exit status of a specific child process
11 * and repeated call on the same process will fail with ECHILD.
12 */
13
14 #include <stdlib.h>
15 #include <sys/types.h>
16 #include <signal.h>
17 #include <errno.h>
18 #include <sys/wait.h>
19
20 #include "tst_test.h"
21
22 #define MAX_CHILDREN 25
23
24 static pid_t children[MAX_CHILDREN];
25
check_waitpid(pid_t pid,int reaped)26 static void check_waitpid(pid_t pid, int reaped)
27 {
28 TEST(waitpid(pid, NULL, 0));
29
30 if (!reaped && pid == (pid_t)TST_RET) {
31 tst_res(TPASS, "waitpid(%d) returned correct PID", pid);
32 return;
33 }
34
35 if (reaped && TST_RET == -1 && TST_ERR == ECHILD) {
36 tst_res(TPASS | TTERRNO, "waitpid(%d) failed on reaped child",
37 pid);
38 return;
39 }
40
41 if (TST_RET == -1) {
42 tst_res(TFAIL | TTERRNO, "waitpid(%d) failed", pid);
43 return;
44 }
45
46 if (TST_RET < 0) {
47 tst_res(TFAIL | TTERRNO,
48 "Unexpected waitpid(%d) return value %ld", pid,
49 TST_RET);
50 return;
51 }
52
53 tst_res(TFAIL, "waitpid(%d) returned unexpected PID %ld", pid, TST_RET);
54 }
55
run(void)56 static void run(void)
57 {
58 int i;
59
60 for (i = 0; i < MAX_CHILDREN; i++) {
61 children[i] = SAFE_FORK();
62
63 /* Children have nothing to do... */
64 if (!children[i])
65 exit(0);
66 }
67
68 /* Wait for one specific child */
69 i = MAX_CHILDREN / 2;
70 check_waitpid(children[i], 0);
71
72 /* Try the same child again after it was reaped */
73 check_waitpid(children[i], 1);
74 tst_reap_children();
75 }
76
77 static struct tst_test test = {
78 .test_all = run,
79 .forks_child = 1
80 };
81