truncate.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 1990 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include "chkpath.h"
#include <syscall.h>
#include <unistd.h>
#include <errno.h>
#include <sys/fcntl.h>
#include <sys/param.h>
extern int errno;
int truncate(path, length)
char *path;
off_t length;
{
int fd, ret=0;
CHKNULL(path);
if (strcmp(path, "/etc/mtab") == 0 || strcmp(path, "/etc/fstab") == 0) {
errno = ENOENT;
return(-1);
}
if ((fd = open(path, O_WRONLY)) == -1) {
return(-1);
}
if (ftruncate(fd, length) == -1) {
close(fd);
return(-1);
}
close(fd);
return(0);
}