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 * Copyright (c) 2012 by Delphix. All rights reserved.
29 */
30
31 /*
32 * Copyright (c) 2018, Joyent, Inc.
33 */
34
35 #include "../file_common.h"
36
37 /*
38 * Create a file with assigned size and then free the specified
39 * section of the file
40 */
41
42 static void usage(char *progname);
43
44 static void
usage(char * progname)45 usage(char *progname)
46 {
47 (void) fprintf(stderr,
48 "usage: %s [-l filesize] [-s start-offset]"
49 "[-n section-len] filename\n", progname);
50 exit(1);
51 }
52
53 int
main(int argc,char * argv[])54 main(int argc, char *argv[])
55 {
56 char *filename = NULL;
57 char *buf;
58 size_t filesize = 0;
59 off_t start_off = 0;
60 off_t off_len = 0;
61 int fd, ch;
62 struct flock fl;
63 mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
64
65 while ((ch = getopt(argc, argv, "l:s:n:")) != EOF) {
66 switch (ch) {
67 case 'l':
68 filesize = atoll(optarg);
69 break;
70 case 's':
71 start_off = atoll(optarg);
72 break;
73 case 'n':
74 off_len = atoll(optarg);
75 break;
76 default:
77 usage(argv[0]);
78 break;
79 }
80 }
81
82 if (optind == argc - 1)
83 filename = argv[optind];
84 else
85 usage(argv[0]);
86
87 buf = (char *)malloc(filesize);
88
89 if ((fd = open(filename, O_RDWR | O_CREAT | O_TRUNC, mode)) < 0) {
90 perror("open");
91 free(buf);
92 return (1);
93 }
94 if (write(fd, buf, filesize) < filesize) {
95 perror("write");
96 free(buf);
97 return (1);
98 }
99 fl.l_whence = SEEK_SET;
100 fl.l_start = start_off;
101 fl.l_len = off_len;
102 if (fcntl(fd, F_FREESP, &fl) != 0) {
103 perror("fcntl");
104 free(buf);
105 return (1);
106 }
107
108 free(buf);
109 return (0);
110 }
111