1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) International Business Machines  Corp., 2001
4 * 07/2001 Ported by Wayne Boyer
5 * Copyright (c) 2021 Xie Ziyao <xieziyao@huawei.com>
6 */
7
8/*\
9 * [Description]
10 *
11 * Check that the parent's file descriptors will not be affected by being
12 * closed in the child.
13 */
14
15#include <stdlib.h>
16
17#include "tst_test.h"
18
19#define TESTFILE "testfile_fork08"
20
21static int fd;
22static char buf;
23
24static void run(void)
25{
26	int ret;
27
28	fd = SAFE_OPEN(TESTFILE, O_RDONLY);
29	if (!SAFE_FORK()) {
30		SAFE_CLOSE(fd);
31		exit(0);
32	}
33
34	if (!SAFE_FORK()) {
35		SAFE_READ(1, fd, &buf, 1);
36		if (buf != 'a')
37			tst_res(TFAIL, "%6d: read '%c' instead of 'a'",
38				getpid(), buf);
39		SAFE_CLOSE(fd);
40		exit(0);
41	}
42	tst_reap_children();
43
44	ret = read(fd, &buf, 1);
45	if (ret == 0)
46		tst_res(TPASS, "read the end of file correctly");
47	else
48		tst_res(TFAIL | TERRNO, "read() returns %d, expected 0", ret);
49
50	SAFE_CLOSE(fd);
51}
52
53static void setup(void)
54{
55	tst_fill_file(TESTFILE, 'a', 1, 1);
56}
57
58static void cleanup(void)
59{
60	if (fd > 0)
61		SAFE_CLOSE(fd);
62}
63
64static struct tst_test test = {
65	.forks_child = 1,
66	.needs_tmpdir = 1,
67	.cleanup = cleanup,
68	.setup = setup,
69	.test_all = run,
70};
71