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/*
* Copyright (C) 2006 David Härdeman <david@2gen.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mount.h> /* for BLKGETSIZE definitions */
#include <getopt.h>
#include <string.h>
#include <time.h>
/* Progress indicator to output */
# define PROGRESS_INDICATOR "*\n"
/* How many progress indicators to output in total */
#define PROGRESS_PARTS 1000
/* How many bytes to write at a time (default) */
#define DEFAULT_WSIZE 4096
/* Debugging output */
#ifdef DEBUG
#define dprintf(x, ...) fprintf(stderr, x, ...)
#else
#define dprintf(x, ...)
#endif
static void die(const char *message, int perr)
{
if (perr)
perror(message);
else
fprintf(stderr, "Error: %s\n", message);
exit(1);
}
static void usage(const char *message, const char *argv0)
{
printf("%s: %s\n"
"Usage: %s [options] device\n"
" -f=FILE\tread data to write from file instead of writing zero\n"
" -s=NUM\twrite NUM bytes at a time (default %i)\n"
, argv0, message, argv0, DEFAULT_WSIZE);
exit(1);
}
static unsigned long long dev_size(int fd)
{
int ret;
unsigned long long size;
ret = ioctl(fd, BLKGETSIZE64, &size);
if (ret < 0) {
close(fd);
die("failed to get device size", 1);
}
return size;
}
static int do_wipe(int source, int target, size_t wsize)
{
unsigned long long size;
unsigned long long done = 0;
unsigned int previous_progress = 0;
unsigned int progress = 0;
time_t last_sync = 0;
int i;
ssize_t count;
char *buf = calloc(wsize, 1);
if (buf == NULL)
die("buffer allocation failed", 1);
size = dev_size(target);
dprintf("Block size in bytes is %llu\n", size);
/* From now on, try to make sure stdout is unbuffered */
setbuf(stdout, NULL);
while (done < size) {
/* First read (if we have a source) */
if (source) {
count = read(source, buf, wsize);
if (count != wsize)
die("failed to read from source", 1);
}
/* Now write what we just read */
count = write(target, buf, wsize);
dprintf("Count is %zi\n", count);
if (count < 0)
die("failed to write to target", 1);
/* Calculate progress */
done += count;
progress = ((done * PROGRESS_PARTS)/ size);
dprintf("We just wrote %zi, done %llu\n", count, done);
if (progress > previous_progress) {
/* sync on every progress output, but at most once per second */
time_t now = time(NULL);
if (now != last_sync) {
fdatasync(target);
last_sync = now;
}
for (i = 0; i < progress - previous_progress; i++)
printf(PROGRESS_INDICATOR);
previous_progress = progress;
}
}
free(buf);
fdatasync(target);
return 0;
}
int main(int argc, char **argv, char **envp)
{
int target, source, ret;
char *sourcefname = NULL;
size_t wsize = DEFAULT_WSIZE;
/* Parse options */
while (1) {
ret = getopt(argc, argv, "f:s:");
if (ret == -1)
break;
switch(ret) {
case 'f':
sourcefname = optarg;
break;
case 's':
wsize = (size_t)atol(optarg);
if (wsize < 1)
die("incorrect size", 0);
break;
default:
die("unknown getopt failure", 0);
break;
}
}
if (argc - optind != 1)
usage("you must specify one target device", argv[0]);
/* Get target */
target = open(argv[optind], O_WRONLY);
if (target < 0)
die("failed to open device", 1);
/* Get source */
if (sourcefname) {
source = open(sourcefname, O_RDONLY);
if (source < 0)
die("failed to open source", 1);
} else {
source = 0;
}
/* Wipe device */
ret = do_wipe(source, target, wsize);
/* Clean up */
close(source);
close(target);
if (ret)
die("failed to wipe device", 0);
return 0;
}
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