1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2017 Carlo Marcelo Arenas Belon <carlo@gmail.com>
4 * Copyright (c) 2018 Cyril Hrubis <chrubis@suse.cz>
5 * Copyright (c) Linux Test Project, 2003-2023
6 */
7
8 /*\
9 * [Description]
10 *
11 * Tests for a special case NULL buffer with size 0 is expected to return 0.
12 */
13
14 #include "tst_test.h"
15
16 static int fd;
17
verify_write(void)18 static void verify_write(void)
19 {
20 TST_EXP_POSITIVE(write(fd, NULL, 0));
21
22 TST_EXP_EXPR(TST_RET == 0, "write(fd, NULL, %ld) == %d", TST_RET, 0);
23 }
24
setup(void)25 static void setup(void)
26 {
27 fd = SAFE_OPEN("test_file", O_RDWR | O_CREAT, 0700);
28 }
29
cleanup(void)30 static void cleanup(void)
31 {
32 if (fd > 0)
33 SAFE_CLOSE(fd);
34 }
35
36 static struct tst_test test = {
37 .setup = setup,
38 .cleanup = cleanup,
39 .test_all = verify_write,
40 .needs_tmpdir = 1,
41 };
42