1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2001
4 * Copyright (c) Linux Test Project, 2003-2023
5 * Author: 2001 Ported by Wayne Boyer
6 */
7
8 /*\
9 *[Description]
10 *
11 * Check that child process can use a large text space and do a large number
12 * of operations. In this situation, check for pid == 0 in child and check
13 * for pid > 0 in parent after wait.
14 */
15
16 #include <unistd.h>
17 #include <sys/wait.h>
18 #include <stdlib.h>
19 #include "tst_test.h"
20
verify_fork(void)21 static void verify_fork(void)
22 {
23 float fl1, fl2;
24 int pid1, pid2, status, i;
25
26 pid1 = SAFE_FORK();
27 if (!pid1) {
28 /* child uses some cpu time slices */
29 for (i = 1; i < 32767; i++) {
30 fl1 = 0.000001;
31 fl1 = fl2 = 0.000001;
32 fl1 = fl1 * 10.0;
33 fl2 = fl1 / 1.232323;
34 fl1 = fl2 - fl2;
35 fl1 = fl2;
36 }
37 exit(!!pid1);
38 }
39
40 tst_res(TINFO, "process id in parent of child from fork: %d", pid1);
41 pid2 = SAFE_WAIT(&status);
42
43 if (pid1 != pid2) {
44 tst_res(TFAIL, "pids don't match: %d vs %d", pid1, pid2);
45 return;
46 }
47
48 if ((status >> 8) != 0) {
49 tst_res(TFAIL, "child exited with failure");
50 return;
51 }
52
53 tst_res(TPASS, "test PASSED");
54 }
55
56 static struct tst_test test = {
57 .test_all = verify_fork,
58 .forks_child = 1,
59 };
60