1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2001
4 * Ported to LTP: Wayne Boyer
5 * Copyright (c) 2018 Cyril Hrubis <[email protected]>
6 */
7 /*
8 * Fork a process that creates a file and writes a few bytes, and
9 * calls exit WITHOUT calling close(). The parent then reads the
10 * file. If everything that was written is present in the file, then
11 * the test passes.
12 */
13
14 #include <stdlib.h>
15 #include "tst_test.h"
16
17 #define FNAME "test_file"
18
child_write(void)19 static void child_write(void)
20 {
21 int fd;
22
23 fd = SAFE_CREAT(FNAME, 0666);
24 SAFE_WRITE(SAFE_WRITE_ALL, fd, FNAME, sizeof(FNAME));
25 exit(0);
26 }
27
check_file(void)28 static void check_file(void)
29 {
30 int fd, len;
31 char buf[256];
32
33 fd = SAFE_OPEN(FNAME, O_RDONLY);
34 len = SAFE_READ(0, fd, buf, sizeof(buf));
35
36 if (len != sizeof(FNAME)) {
37 tst_res(TFAIL, "Wrong length %i expected %zu", len, sizeof(buf));
38 goto out;
39 }
40
41 if (memcmp(buf, FNAME, sizeof(FNAME))) {
42 tst_res(TFAIL, "Wrong data read back");
43 goto out;
44 }
45
46 tst_res(TPASS, "File written by child read back correctly");
47 out:
48 SAFE_CLOSE(fd);
49 }
50
run(void)51 static void run(void)
52 {
53 int pid;
54
55 pid = SAFE_FORK();
56 if (!pid)
57 child_write();
58
59 tst_reap_children();
60
61 check_file();
62
63 SAFE_UNLINK(FNAME);
64 }
65
66 static struct tst_test test = {
67 .needs_tmpdir = 1,
68 .forks_child = 1,
69 .test_all = run,
70 };
71