1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 #include "chkpath.h"
30 #include <sys/syscall.h>
31 #include <unistd.h>
32 #include <errno.h>
33 #include <sys/fcntl.h>
34 #include <sys/param.h>
35
36 int
truncate(char * path,off_t length)37 truncate(char *path, off_t length)
38 {
39 int fd, ret = 0;
40
41 CHKNULL(path);
42
43 if (strcmp(path, "/etc/mtab") == 0 || strcmp(path, "/etc/fstab") == 0) {
44 errno = ENOENT;
45 return (-1);
46 }
47 if ((fd = open(path, O_WRONLY)) == -1) {
48 return (-1);
49 }
50
51 if (ftruncate(fd, length) == -1) {
52 close(fd);
53 return (-1);
54 }
55 close(fd);
56 return (0);
57 }
58