1 /*
2 * Copyright (c) International Business Machines Corp., 2001
3 * 07/2001 Ported by Wayne Boyer
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19
20 /*
21 * Testcase to check that creat(2) system call returns EMFILE.
22 */
23
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <errno.h>
27 #include <sys/types.h>
28 #include <sys/time.h>
29 #include <sys/resource.h>
30 #include <sys/stat.h>
31 #include <fcntl.h>
32 #include <linux/limits.h>
33 #include <unistd.h>
34 #include "tst_test.h"
35
36 static int *opened_fds, num_opened_fds;
37
verify_creat(void)38 static void verify_creat(void)
39 {
40 TEST(creat("filename", 0666));
41
42 if (TEST_RETURN != -1) {
43 tst_res(TFAIL, "call succeeded unexpectedly");
44 SAFE_CLOSE(TEST_RETURN);
45 return;
46 }
47
48 if (TEST_ERRNO == EMFILE)
49 tst_res(TPASS, "creat() failed with EMFILE");
50 else
51 tst_res(TFAIL | TTERRNO, "Expected EMFILE");
52 }
53
setup(void)54 static void setup(void)
55 {
56 int max_open;
57 int fd;
58 char fname[PATH_MAX];
59
60 /* get the maximum number of files that we can open */
61 max_open = getdtablesize();
62 tst_res(TINFO, "getdtablesize() = %d", max_open);
63 opened_fds = SAFE_MALLOC(max_open * sizeof(int));
64
65 /* now open as many files as we can up to max_open */
66 do {
67 snprintf(fname, sizeof(fname), "creat05_%d", num_opened_fds);
68 fd = SAFE_CREAT(fname, 0666);
69 opened_fds[num_opened_fds++] = fd;
70 } while (fd < max_open - 1);
71
72 tst_res(TINFO, "Opened additional #%d fds", num_opened_fds);
73 }
74
cleanup(void)75 static void cleanup(void)
76 {
77 int i;
78
79 for (i = 0; i < num_opened_fds; i++) {
80 if (close(opened_fds[i])) {
81 tst_res(TWARN | TERRNO, "close(%i) failed",
82 opened_fds[i]);
83 }
84 }
85
86 free(opened_fds);
87 }
88
89 static struct tst_test test = {
90 .tid = "creat05",
91 .test_all = verify_creat,
92 .needs_tmpdir = 1,
93 .setup = setup,
94 .cleanup = cleanup,
95 };
96