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, ssize_t recsize)
45 {
46 	int i, fd;
47 	ssize_t 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 (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