e2fsck/flushb.c

/*
 * flushb.c --- This routine flushes the disk buffers for a disk
 *
 * Copyright 1997, 2000, by Theodore Ts'o.
 * 
 * This program may be used under the provisions of the GNU Public
 * License, *EXCEPT* that it may not be included in the Debian
 * distribution.  (Yes, this violates the Debian Free Software
 * Guidelines.  That's the point.  I don't want this program being
 * distributed in Debian, because I don't care to support it, and the
 * maintainer, Yann Dirson, doesn't seem to pay attention to my wishes
 * on this matter.  So I'm deliberately adding this clause so it
 * violates the Debian Free Software Guidelines to force him to take
 * it out.  (What part of THIS IS FOR MY OWN USE don't you understand?
 * And no, I'm going to write a man page for it either.  And don't
 * file a bug about it or bug me about it.)  If this doesn't work,
 * I'll have to remove it from the upstream source distribution on the
 * next release.  So there.  :-)
 */

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include "../misc/nls-enable.h"

#ifdef __STDC__
#define NOARGS void
#else
#define NOARGS
#define const
#endif

/* For Linux/i386, define BLKFLSBUF */
#if (!defined(BLKFLSBUF) && defined(__i386__))
#define BLKFLSBUF  0x1261	/* flush buffer cache */
#endif

const char *progname;

static void usage(NOARGS)
{
	fprintf(stderr, _("Usage: %s disk\n"), progname);
	exit(1);
}	
	
int main(int argc, char **argv)
{
	int	fd;
	
	progname = argv[0];
	if (argc != 2)
		usage();

	fd = open(argv[1], O_RDONLY, 0);
	if (fd < 0) {
		perror("open");
		exit(1);
	}
	/*
	 * Note: to reread the partition table, use the ioctl
	 * BLKRRPART instead of BLKFSLBUF.
	 */
#ifdef BLKFLSBUF
	if (ioctl(fd, BLKFLSBUF, 0) < 0) {
		perror("ioctl BLKFLSBUF");
		exit(1);
	}
	return 0;
#else
	fprintf(stderr,
		_("BLKFLSBUF ioctl not supported!  Can't flush buffers.\n"));
	return 1;
#endif
}