1/* vi: set sw=4 ts=4: */
2/*
3 * freeramdisk implementation for busybox
4 *
5 * Copyright (C) 2000 and written by Emanuele Caratti <wiz@iol.it>
6 * Adjusted a bit by Erik Andersen <andersee@debian.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 */
23
24#include <stdio.h>
25#include <string.h>
26#include <sys/types.h>
27#include <fcntl.h>
28#include <sys/ioctl.h>
29#include <errno.h>
30#include <stdlib.h>
31#include "busybox.h"
32
33
34/* From linux/fs.h */
35#define BLKFLSBUF  _IO(0x12,97)	/* flush buffer cache */
36
37extern int
38freeramdisk_main(int argc, char **argv)
39{
40	int   f;
41
42	if (argc != 2 || *argv[1] == '-') {
43		show_usage();
44	}
45
46	if ((f = open(argv[1], O_RDWR)) == -1) {
47		perror_msg_and_die("cannot open %s", argv[1]);
48	}
49	if (ioctl(f, BLKFLSBUF) < 0) {
50		perror_msg_and_die("failed ioctl on %s", argv[1]);
51	}
52	/* Don't bother closing.  Exit does
53	 * that, so we can save a few bytes */
54	/* close(f); */
55	return EXIT_SUCCESS;
56}
57
58/*
59Local Variables:
60c-file-style: "linux"
61c-basic-offset: 4
62tab-width: 4
63End:
64*/
65
66