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 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 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