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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 (TST_RET != -1) {
43 		tst_res(TFAIL, "call succeeded unexpectedly");
44 		SAFE_CLOSE(TST_RET);
45 		return;
46 	}
47 
48 	if (TST_ERR == 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 	.test_all = verify_creat,
91 	.needs_tmpdir = 1,
92 	.setup = setup,
93 	.cleanup = cleanup,
94 };
95