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 *
fifolog_create(const char * fn,off_t size,ssize_t recsize)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