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 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, ssize_t recsize) 45 { 46 int i, fd; 47 ssize_t u; 48 u_int uu; 49 off_t ms; 50 struct stat st; 51 char *buf; 52 int created; 53 54 fd = open(fn, O_WRONLY | O_TRUNC | O_EXCL | O_CREAT, 0644); 55 if (fd < 0) { 56 created = 0; 57 fd = open(fn, O_WRONLY); 58 if (fd < 0) 59 return ("Could not open"); 60 } else 61 created = 1; 62 63 /* Default sectorsize is 512 */ 64 if (recsize == 0) 65 recsize = 512; 66 67 /* See what we got... */ 68 i = fstat(fd, &st); 69 assert(i == 0); 70 if (!S_ISBLK(st.st_mode) && 71 !S_ISCHR(st.st_mode) && 72 !S_ISREG(st.st_mode)) { 73 assert(!close (fd)); 74 return ("Wrong file type"); 75 } 76 77 if(!created && S_ISREG(st.st_mode)) { 78 assert(!close (fd)); 79 return ("Wrong file type"); 80 } 81 82 /* For raw disk with larger sectors: use 1 sector */ 83 i = ioctl(fd, DIOCGSECTORSIZE, &uu); 84 u = uu; 85 if (i == 0 && (u > recsize || (recsize % u) != 0)) 86 recsize = u; 87 88 /* If no configured size, or too large for disk, use device size */ 89 i = ioctl(fd, DIOCGMEDIASIZE, &ms); 90 if (i == 0 && (size == 0 || size > ms)) 91 size = ms; 92 93 if (size == 0 && S_ISREG(st.st_mode)) 94 size = st.st_size; 95 96 if (size == 0) 97 size = recsize * (off_t)(24*60*60); 98 99 if (S_ISREG(st.st_mode) && ftruncate(fd, size) < 0) 100 return ("Could not ftrunc"); 101 102 buf = calloc(1, recsize); 103 if (buf == NULL) 104 return ("Could not malloc"); 105 106 strcpy(buf, FIFOLOG_FMT_MAGIC); /*lint !e64 */ 107 be32enc(buf + FIFOLOG_OFF_BS, recsize); 108 if (recsize != pwrite(fd, buf, recsize, 0)) { 109 i = errno; 110 free(buf); 111 errno = i; 112 return ("Could not write first sector"); 113 } 114 memset(buf, 0, recsize); 115 if ((int)recsize != pwrite(fd, buf, recsize, recsize)) { 116 i = errno; 117 free(buf); 118 errno = i; 119 return ("Could not write second sector"); 120 } 121 free(buf); 122 assert(0 == close(fd)); 123 return (NULL); 124 } 125