xref: /freebsd/crypto/openssh/openbsd-compat/regress/closefromtest.c (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
1 /*
2  * Copyright (c) 2006 Darren Tucker
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/types.h>
18 #include <sys/stat.h>
19 
20 #include <fcntl.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <unistd.h>
24 
25 #define NUM_OPENS 10
26 
27 void
28 fail(char *msg)
29 {
30 	fprintf(stderr, "closefrom: %s\n", msg);
31 	exit(1);
32 }
33 
34 int
35 main(void)
36 {
37 	int i, max, fds[NUM_OPENS];
38 	char buf[512];
39 
40 	for (i = 0; i < NUM_OPENS; i++)
41 		if ((fds[i] = open("/dev/null", "r")) == -1)
42 			exit(0);	/* can't test */
43 	max = i - 1;
44 
45 	/* should close last fd only */
46 	closefrom(fds[max]);
47 	if (close(fds[max]) != -1)
48 		fail("failed to close highest fd");
49 
50 	/* make sure we can still use remaining descriptors */
51 	for (i = 0; i < max; i++)
52 		if (read(fds[i], buf, sizeof(buf)) == -1)
53 			fail("closed descriptors it should not have");
54 
55 	/* should close all fds */
56 	closefrom(fds[0]);
57 	for (i = 0; i < NUM_OPENS; i++)
58 		if (close(fds[i]) != -1)
59 			fail("failed to close from lowest fd");
60 }
61