2 * Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12 * Further, this software is distributed without any warranty that it is
13 * free of the rightful claim of any third person regarding infringement
14 * or the like. Any license provided herein, whether implied or
15 * otherwise, applies only to this software file. Patent licenses, if
16 * any, provided herein do not apply to combinations of this program with
17 * other software, or any other product whatsoever.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write the Free Software Foundation, Inc., 59
21 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
24 * Mountain View, CA 94043, or:
28 * For further information regarding this notice, see:
30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
41 To read unallocated disk blocks in a filesystem, do
48 extern char *sys_errlist[];
61 fprintf(stderr, "usage:\t%s [-s size] pathname\n", Progname);
62 fprintf(stderr, "\t-s size\t\tsize of file (default 10,000,000 bytes)\n");
72 char *pathname = NULL;
73 off_t size = 10000000;
75 int method = F_RESVSP;
80 if (Progname = strrchr(argv[0], '/')) {
86 /* Crack and validate the command line options. */
88 while ((opt = getopt(argc, argv, "s:")) != EOF) {
97 if (optind + 1 != argc)
99 pathname = argv[optind];
101 /* Create the file and write one byte at a large offset to create a
102 big hole in the middle of the file.
105 if ((fd = open(pathname, O_RDWR|O_CREAT|O_TRUNC, 0666)) < 0) {
106 perror("open failed");
109 if (lseek(fd, size, 0) < 0) {
110 perror("lseek failed");
114 if (write(fd, buff, 1) != 1) {
115 perror("write failed");
119 /* Now fill in the hole with uninitialized blocks. */
125 if (fcntl(fd, method, &flock) < 0) {
126 perror("fcntl failed");
129 printf("%s created\n", pathname);