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
16static int fd;
17
18static 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
25static void setup(void)
26{
27	fd = SAFE_OPEN("test_file", O_RDWR | O_CREAT, 0700);
28}
29
30static void cleanup(void)
31{
32	if (fd > 0)
33		SAFE_CLOSE(fd);
34}
35
36static struct tst_test test = {
37	.setup = setup,
38	.cleanup = cleanup,
39	.test_all = verify_write,
40	.needs_tmpdir = 1,
41};
42