1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) International Business Machines  Corp., 2001
4 * 07/2001 Ported by Wayne Boyer
5 * Copyright (c) Linux Test Project, 2002-2015
6 * Copyright (c) 2023 SUSE LLC Avinesh Kumar <avinesh.kumar@suse.com>
7 */
8
9/*\
10 * [Description]
11 *
12 * Verify that, pipe(2) syscall fails with errno EMFILE when
13 * limit on the number of open file descriptors has been reached.
14 */
15
16#include "tst_test.h"
17#include <stdlib.h>
18
19static int fds[2];
20static int *opened_fds, num_opened_fds;
21
22static void setup(void)
23{
24	int max_fds;
25
26	max_fds = getdtablesize();
27	tst_res(TINFO, "getdtablesize() = %d", max_fds);
28	opened_fds = SAFE_MALLOC(max_fds * sizeof(int));
29
30	do {
31		SAFE_PIPE(fds);
32		opened_fds[num_opened_fds++] = fds[0];
33		opened_fds[num_opened_fds++] = fds[1];
34	} while (fds[1] < max_fds - 2);
35
36	tst_res(TINFO, "Number of fds opened by pipe calls: %d", num_opened_fds);
37}
38
39static void run(void)
40{
41	TST_EXP_FAIL(pipe(fds), EMFILE);
42}
43
44static void cleanup(void)
45{
46	for (int i = 0; i < num_opened_fds; i++)
47		SAFE_CLOSE(opened_fds[i]);
48
49	if (opened_fds)
50		free(opened_fds);
51}
52
53static struct tst_test test = {
54	.setup = setup,
55	.cleanup = cleanup,
56	.test_all = run
57};
58