1 /*
2 * Copyright (c) International Business Machines Corp., 2001
3 * 07/2001 Ported by Wayne Boyer
4 * Copyright (c) 2018 Cyril Hrubis <chrubis@suse.cz>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
14 * the GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20 /*
21 * Fork a process that creates a file and writes a few bytes, and
22 * calls exit WITHOUT calling close(). The parent then reads the
23 * file. If everything that was written is present in the file, then
24 * the test passes.
25 */
26
27 #include <stdlib.h>
28 #include "tst_test.h"
29
30 #define FNAME "test_file"
31
child_write(void)32 static void child_write(void)
33 {
34 int fd;
35
36 fd = SAFE_CREAT(FNAME, 0666);
37 SAFE_WRITE(1, fd, FNAME, sizeof(FNAME));
38 exit(0);
39 }
40
check_file(void)41 static void check_file(void)
42 {
43 int fd, len;
44 char buf[256];
45
46 fd = SAFE_OPEN(FNAME, O_RDONLY);
47 len = SAFE_READ(0, fd, buf, sizeof(buf));
48
49 if (len != sizeof(FNAME)) {
50 tst_res(TFAIL, "Wrong length %i expected %zu", len, sizeof(buf));
51 goto out;
52 }
53
54 if (memcmp(buf, FNAME, sizeof(FNAME))) {
55 tst_res(TFAIL, "Wrong data read back");
56 goto out;
57 }
58
59 tst_res(TPASS, "File written by child read back correctly");
60 out:
61 SAFE_CLOSE(fd);
62 }
63
run(void)64 static void run(void)
65 {
66 int pid;
67
68 pid = SAFE_FORK();
69 if (!pid)
70 child_write();
71
72 tst_reap_children();
73
74 check_file();
75
76 SAFE_UNLINK(FNAME);
77 }
78
79 static struct tst_test test = {
80 .needs_tmpdir = 1,
81 .forks_child = 1,
82 .test_all = run,
83 };
84