1 /*
2 * Copyright (c) 2017 Carlo Marcelo Arenas Belon <carlo@gmail.com>
3 * Copyright (c) 2018 Cyril Hrubis <chrubis@suse.cz>
4 *
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
17 */
18 /*
19 * Tests for a special case NULL buffer with size 0 is expected to return 0.
20 */
21
22 #include <errno.h>
23 #include "tst_test.h"
24
25 static int fd;
26
verify_write(void)27 static void verify_write(void)
28 {
29 TEST(write(fd, NULL, 0));
30
31 if (TST_RET != 0) {
32 tst_res(TFAIL | TTERRNO,
33 "write() should have succeeded with ret=0");
34 return;
35 }
36
37 tst_res(TPASS, "write(fd, NULL, 0) == 0");
38 }
39
setup(void)40 static void setup(void)
41 {
42 fd = SAFE_OPEN("test_file", O_RDWR | O_CREAT, 0700);
43 }
44
cleanup(void)45 static void cleanup(void)
46 {
47 if (fd > 0)
48 SAFE_CLOSE(fd);
49 }
50
51 static struct tst_test test = {
52 .setup = setup,
53 .cleanup = cleanup,
54 .test_all = verify_write,
55 .needs_tmpdir = 1,
56 };
57