1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2001
4 * Ported to LTP: Wayne Boyer
5 */
6
7 /*
8 * Testcase to check that creat(2) system call returns EMFILE.
9 */
10
11 #include <stdio.h>
12 #include <stdlib.h>
13 #include <errno.h>
14 #include <sys/types.h>
15 #include <sys/time.h>
16 #include <sys/resource.h>
17 #include <sys/stat.h>
18 #include <fcntl.h>
19 #include <linux/limits.h>
20 #include <unistd.h>
21 #include "tst_test.h"
22
23 static int *opened_fds, num_opened_fds;
24
verify_creat(void)25 static void verify_creat(void)
26 {
27 TEST(creat("filename", 0666));
28
29 if (TST_RET != -1) {
30 tst_res(TFAIL, "call succeeded unexpectedly");
31 SAFE_CLOSE(TST_RET);
32 return;
33 }
34
35 if (TST_ERR == EMFILE)
36 tst_res(TPASS, "creat() failed with EMFILE");
37 else
38 tst_res(TFAIL | TTERRNO, "Expected EMFILE");
39 }
40
setup(void)41 static void setup(void)
42 {
43 int max_open;
44 int fd;
45 char fname[PATH_MAX];
46
47 /* get the maximum number of files that we can open */
48 max_open = getdtablesize();
49 tst_res(TINFO, "getdtablesize() = %d", max_open);
50 opened_fds = SAFE_MALLOC(max_open * sizeof(int));
51
52 /* now open as many files as we can up to max_open */
53 do {
54 snprintf(fname, sizeof(fname), "creat05_%d", num_opened_fds);
55 fd = SAFE_CREAT(fname, 0666);
56 opened_fds[num_opened_fds++] = fd;
57 } while (fd < max_open - 1);
58
59 tst_res(TINFO, "Opened additional #%d fds", num_opened_fds);
60 }
61
cleanup(void)62 static void cleanup(void)
63 {
64 int i;
65
66 for (i = 0; i < num_opened_fds; i++) {
67 if (close(opened_fds[i])) {
68 tst_res(TWARN | TERRNO, "close(%i) failed",
69 opened_fds[i]);
70 }
71 }
72
73 free(opened_fds);
74 }
75
76 static struct tst_test test = {
77 .test_all = verify_creat,
78 .needs_tmpdir = 1,
79 .setup = setup,
80 .cleanup = cleanup,
81 };
82