xref: /openbsd-src/regress/sys/kern/ftruncate/ftruncate.c (revision f9c8c5d11dc09943c96e7f5cd7ed12d0829e0674)
1 /*	$OpenBSD: ftruncate.c,v 1.1 2018/07/08 02:14:54 anton Exp $	*/
2 /*
3  * Copyright (c) 2018 Anton Lindqvist <anton@openbsd.org>
4  *
5  * Permission to use, copy, modify, and distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17 
18 /*
19  * Regression test for NULL-deref inside vn_writechk().
20  */
21 
22 #include <err.h>
23 #include <fcntl.h>
24 #include <stdio.h>
25 #include <unistd.h>
26 #include <stdlib.h>
27 
28 int
main(void)29 main(void)
30 {
31 	const char *path = "/dev/bpf";
32 	int fd;
33 
34 	fd = open(path, O_RDWR);
35 	if (fd == -1)
36 		err(1, "open: %s", path);
37 	if (ftruncate(fd, 0) == -1)
38 		err(1, "ftruncate");
39 	close(fd);
40 
41 	return 0;
42 }
43