blob: a2b17c6737b9daa31bdef62e4048584111bceb22 [file] [log] [blame]
Erik Andersen64371702000-03-04 22:23:27 +00001/* 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>
Erik Andersen64371702000-03-04 22:23:27 +000026#include <sys/types.h>
Erik Andersen64371702000-03-04 22:23:27 +000027#include <fcntl.h>
28#include <sys/ioctl.h>
29#include <errno.h>
Eric Andersen3570a342000-09-25 21:45:58 +000030#include "busybox.h"
Erik Andersen64371702000-03-04 22:23:27 +000031
32
Eric Andersen1e03add2000-07-06 09:56:35 +000033/* From linux/fs.h */
34#define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
35
Erik Andersen64371702000-03-04 22:23:27 +000036extern int
37freeramdisk_main(int argc, char **argv)
38{
Erik Andersen64371702000-03-04 22:23:27 +000039 int f;
40
Eric Andersenef4268e2000-06-04 05:08:29 +000041 if (argc != 2 || *argv[1] == '-') {
Erik Andersen64371702000-03-04 22:23:27 +000042 usage(freeramdisk_usage);
43 }
44
Eric Andersenef4268e2000-06-04 05:08:29 +000045 if ((f = open(argv[1], O_RDWR)) == -1) {
Matt Kraai1fa1ade2000-12-18 03:57:16 +000046 perror_msg_and_die("cannot open %s", argv[1]);
Erik Andersen64371702000-03-04 22:23:27 +000047 }
48 if (ioctl(f, BLKFLSBUF) < 0) {
Matt Kraai1fa1ade2000-12-18 03:57:16 +000049 perror_msg_and_die("failed ioctl on %s", argv[1]);
Erik Andersen64371702000-03-04 22:23:27 +000050 }
Erik Andersen298854f2000-03-23 01:09:18 +000051 /* Don't bother closing. Exit does
52 * that, so we can save a few bytes */
53 /* close(f); */
Matt Kraai3e856ce2000-12-01 02:55:13 +000054 return EXIT_SUCCESS;
Erik Andersen64371702000-03-04 22:23:27 +000055}
56
57/*
58Local Variables:
59c-file-style: "linux"
60c-basic-offset: 4
61tab-width: 4
62End:
63*/
64