1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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 *
fifolog_create(const char * fn,off_t size,ssize_t recsize)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