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https://github.com/freebsd/freebsd-src
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125 lines
3.4 KiB
C
125 lines
3.4 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2005-2008 Poul-Henning Kamp
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <assert.h>
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <sys/endian.h>
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#include <sys/stat.h>
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#include <sys/disk.h>
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#include "fifolog.h"
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#include "libfifolog.h"
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const char *
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fifolog_create(const char *fn, off_t size, ssize_t recsize)
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{
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int i, fd;
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ssize_t u;
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u_int uu;
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off_t ms;
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struct stat st;
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char *buf;
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int created;
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fd = open(fn, O_WRONLY | O_TRUNC | O_EXCL | O_CREAT, 0644);
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if (fd < 0) {
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created = 0;
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fd = open(fn, O_WRONLY);
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if (fd < 0)
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return ("Could not open");
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} else
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created = 1;
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/* Default sectorsize is 512 */
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if (recsize == 0)
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recsize = 512;
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/* See what we got... */
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i = fstat(fd, &st);
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assert(i == 0);
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if (!S_ISBLK(st.st_mode) &&
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!S_ISCHR(st.st_mode) &&
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!S_ISREG(st.st_mode)) {
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assert(!close (fd));
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return ("Wrong file type");
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}
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if(!created && S_ISREG(st.st_mode)) {
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assert(!close (fd));
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return ("Wrong file type");
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}
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/* For raw disk with larger sectors: use 1 sector */
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i = ioctl(fd, DIOCGSECTORSIZE, &uu);
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u = uu;
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if (i == 0 && (u > recsize || (recsize % u) != 0))
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recsize = u;
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/* If no configured size, or too large for disk, use device size */
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i = ioctl(fd, DIOCGMEDIASIZE, &ms);
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if (i == 0 && (size == 0 || size > ms))
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size = ms;
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if (size == 0 && S_ISREG(st.st_mode))
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size = st.st_size;
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if (size == 0)
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size = recsize * (off_t)(24*60*60);
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if (S_ISREG(st.st_mode) && ftruncate(fd, size) < 0)
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return ("Could not ftrunc");
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buf = calloc(1, recsize);
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if (buf == NULL)
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return ("Could not malloc");
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strcpy(buf, FIFOLOG_FMT_MAGIC); /*lint !e64 */
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be32enc(buf + FIFOLOG_OFF_BS, recsize);
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if (recsize != pwrite(fd, buf, recsize, 0)) {
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i = errno;
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free(buf);
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errno = i;
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return ("Could not write first sector");
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}
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memset(buf, 0, recsize);
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if ((int)recsize != pwrite(fd, buf, recsize, recsize)) {
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i = errno;
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free(buf);
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errno = i;
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return ("Could not write second sector");
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}
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free(buf);
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assert(0 == close(fd));
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return (NULL);
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}
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