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
21 static int fd;
22 static char buf;
23
run(void)24 static 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
setup(void)53 static void setup(void)
54 {
55 tst_fill_file(TESTFILE, 'a', 1, 1);
56 }
57
cleanup(void)58 static void cleanup(void)
59 {
60 if (fd > 0)
61 SAFE_CLOSE(fd);
62 }
63
64 static struct tst_test test = {
65 .forks_child = 1,
66 .needs_tmpdir = 1,
67 .cleanup = cleanup,
68 .setup = setup,
69 .test_all = run,
70 };
71