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