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: releng/10.3/usr.sbin/fifolog/lib/fifolog_create.c 219123 2011-03-01 08:52:10Z phk $
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
43const char *
44fifolog_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