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 <[email protected]>
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
19 static int fds[2];
20 static int *opened_fds, num_opened_fds;
21
setup(void)22 static 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
run(void)39 static void run(void)
40 {
41 TST_EXP_FAIL(pipe(fds), EMFILE);
42 }
43
cleanup(void)44 static 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
53 static struct tst_test test = {
54 .setup = setup,
55 .cleanup = cleanup,
56 .test_all = run
57 };
58