1 /*- 2 * Copyright (c) 2005-2008 Poul-Henning Kamp 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 #include <assert.h> 30 #include <errno.h> 31 #include <stdio.h> 32 #include <string.h> 33 #include <unistd.h> 34 #include <fcntl.h> 35 #include <stdlib.h> 36 #include <sys/endian.h> 37 #include <sys/stat.h> 38 #include <sys/disk.h> 39 40 #include "fifolog.h" 41 #include "libfifolog.h" 42 43 const char * 44 fifolog_create(const char *fn, off_t size, unsigned recsize) 45 { 46 int i, fd; 47 unsigned u; 48 off_t ms; 49 struct stat st; 50 char *buf; 51 int created; 52 53 fd = open(fn, O_WRONLY | O_TRUNC | O_EXCL | O_CREAT, 0644); 54 if (fd < 0) { 55 created = 0; 56 fd = open(fn, O_WRONLY); 57 if (fd < 0) 58 return ("Could not open"); 59 } else 60 created = 1; 61 62 /* Default sectorsize is 512 */ 63 if (recsize == 0) 64 recsize = 512; 65 66 /* See what we got... */ 67 i = fstat(fd, &st); 68 assert(i == 0); 69 if (!S_ISBLK(st.st_mode) && 70 !S_ISCHR(st.st_mode) && 71 !S_ISREG(st.st_mode)) { 72 assert(!close (fd)); 73 return ("Wrong file type"); 74 } 75 76 if(!created && S_ISREG(st.st_mode)) { 77 assert(!close (fd)); 78 return ("Wrong file type"); 79 } 80 81 /* For raw disk with larger sectors: use 1 sector */ 82 i = ioctl(fd, DIOCGSECTORSIZE, &u); 83 if (i == 0 && (u > recsize || (recsize % u) != 0)) 84 recsize = u; 85 86 /* If no configured size, or too large for disk, use device size */ 87 i = ioctl(fd, DIOCGMEDIASIZE, &ms); 88 if (i == 0 && (size == 0 || size > ms)) 89 size = ms; 90 91 if (size == 0 && S_ISREG(st.st_mode)) 92 size = st.st_size; 93 94 if (size == 0) 95 size = recsize * (off_t)(24*60*60); 96 97 if (S_ISREG(st.st_mode) && ftruncate(fd, size) < 0) 98 return ("Could not ftrunc"); 99 100 buf = calloc(recsize, 1); 101 if (buf == NULL) 102 return ("Could not malloc"); 103 104 strcpy(buf, FIFOLOG_FMT_MAGIC); /*lint !e64 */ 105 be32enc(buf + FIFOLOG_OFF_BS, recsize); 106 if ((int)recsize != pwrite(fd, buf, recsize, 0)) { 107 i = errno; 108 free(buf); 109 errno = i; 110 return ("Could not write first sector"); 111 } 112 memset(buf, 0, recsize); 113 if ((int)recsize != pwrite(fd, buf, recsize, recsize)) { 114 i = errno; 115 free(buf); 116 errno = i; 117 return ("Could not write second sector"); 118 } 119 free(buf); 120 assert(0 == close(fd)); 121 return (NULL); 122 } 123