1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2005-2008 Poul-Henning Kamp 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #include <assert.h> 32 #include <errno.h> 33 #include <stdio.h> 34 #include <string.h> 35 #include <unistd.h> 36 #include <fcntl.h> 37 #include <stdlib.h> 38 #include <sys/endian.h> 39 #include <sys/stat.h> 40 #include <sys/disk.h> 41 42 #include "fifolog.h" 43 #include "libfifolog.h" 44 45 const char * 46 fifolog_create(const char *fn, off_t size, ssize_t recsize) 47 { 48 int i, fd; 49 ssize_t u; 50 u_int uu; 51 off_t ms; 52 struct stat st; 53 char *buf; 54 int created; 55 56 fd = open(fn, O_WRONLY | O_TRUNC | O_EXCL | O_CREAT, 0644); 57 if (fd < 0) { 58 created = 0; 59 fd = open(fn, O_WRONLY); 60 if (fd < 0) 61 return ("Could not open"); 62 } else 63 created = 1; 64 65 /* Default sectorsize is 512 */ 66 if (recsize == 0) 67 recsize = 512; 68 69 /* See what we got... */ 70 i = fstat(fd, &st); 71 assert(i == 0); 72 if (!S_ISBLK(st.st_mode) && 73 !S_ISCHR(st.st_mode) && 74 !S_ISREG(st.st_mode)) { 75 assert(!close (fd)); 76 return ("Wrong file type"); 77 } 78 79 if(!created && S_ISREG(st.st_mode)) { 80 assert(!close (fd)); 81 return ("Wrong file type"); 82 } 83 84 /* For raw disk with larger sectors: use 1 sector */ 85 i = ioctl(fd, DIOCGSECTORSIZE, &uu); 86 u = uu; 87 if (i == 0 && (u > recsize || (recsize % u) != 0)) 88 recsize = u; 89 90 /* If no configured size, or too large for disk, use device size */ 91 i = ioctl(fd, DIOCGMEDIASIZE, &ms); 92 if (i == 0 && (size == 0 || size > ms)) 93 size = ms; 94 95 if (size == 0 && S_ISREG(st.st_mode)) 96 size = st.st_size; 97 98 if (size == 0) 99 size = recsize * (off_t)(24*60*60); 100 101 if (S_ISREG(st.st_mode) && ftruncate(fd, size) < 0) 102 return ("Could not ftrunc"); 103 104 buf = calloc(1, recsize); 105 if (buf == NULL) 106 return ("Could not malloc"); 107 108 strcpy(buf, FIFOLOG_FMT_MAGIC); /*lint !e64 */ 109 be32enc(buf + FIFOLOG_OFF_BS, recsize); 110 if (recsize != pwrite(fd, buf, recsize, 0)) { 111 i = errno; 112 free(buf); 113 errno = i; 114 return ("Could not write first sector"); 115 } 116 memset(buf, 0, recsize); 117 if ((int)recsize != pwrite(fd, buf, recsize, recsize)) { 118 i = errno; 119 free(buf); 120 errno = i; 121 return ("Could not write second sector"); 122 } 123 free(buf); 124 assert(0 == close(fd)); 125 return (NULL); 126 } 127