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 2007 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27
28 #include "file_common.h"
29
30 /*
31 * Create a file with assigned size and then free the specified
32 * section of the file
33 */
34
35 static void usage(char *progname);
36
37 static void
usage(char * progname)38 usage(char *progname)
39 {
40 (void) fprintf(stderr,
41 "usage: %s [-l filesize] [-s start-offset]"
42 "[-n section-len] filename\n", progname);
43 exit(1);
44 }
45
46 int
main(int argc,char * argv[])47 main(int argc, char *argv[])
48 {
49 char *filename, *buf;
50 size_t filesize;
51 off_t start_off, off_len;
52 int fd, ch;
53 struct flock fl;
54
55 while ((ch = getopt(argc, argv, "l:s:n:")) != EOF) {
56 switch (ch) {
57 case 'l':
58 filesize = atoll(optarg);
59 break;
60 case 's':
61 start_off = atoll(optarg);
62 break;
63 case 'n':
64 off_len = atoll(optarg);
65 break;
66 default:
67 usage(argv[0]);
68 break;
69 }
70 }
71
72 if (optind == argc - 1)
73 filename = argv[optind];
74 else
75 usage(argv[0]);
76
77 buf = (char *)malloc(filesize);
78
79 if ((fd = open(filename, O_RDWR|O_CREAT|O_TRUNC)) < 0) {
80 perror("open");
81 return (1);
82 }
83 if (write(fd, buf, filesize) < filesize) {
84 perror("write");
85 return (1);
86 }
87 #if UNSUPPORTED
88 fl.l_whence = SEEK_SET;
89 fl.l_start = start_off;
90 fl.l_len = off_len;
91 if (fcntl(fd, F_FREESP, &fl) != 0) {
92 perror("fcntl");
93 return (1);
94 }
95 #else
96 fprintf(stderr, "fcntl: F_FREESP not supported\n");
97 return (1);
98 #endif
99
100 free(buf);
101 return (0);
102 }
103