Erik Andersen | 6437170 | 2000-03-04 22:23:27 +0000 | [diff] [blame] | 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> |
Erik Andersen | 6437170 | 2000-03-04 22:23:27 +0000 | [diff] [blame] | 26 | #include <sys/types.h> |
Erik Andersen | 6437170 | 2000-03-04 22:23:27 +0000 | [diff] [blame] | 27 | #include <fcntl.h> |
| 28 | #include <sys/ioctl.h> |
| 29 | #include <errno.h> |
Eric Andersen | ed3ef50 | 2001-01-27 08:24:39 +0000 | [diff] [blame^] | 30 | #include <stdlib.h> |
Eric Andersen | 3570a34 | 2000-09-25 21:45:58 +0000 | [diff] [blame] | 31 | #include "busybox.h" |
Erik Andersen | 6437170 | 2000-03-04 22:23:27 +0000 | [diff] [blame] | 32 | |
| 33 | |
Eric Andersen | 1e03add | 2000-07-06 09:56:35 +0000 | [diff] [blame] | 34 | /* From linux/fs.h */ |
| 35 | #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */ |
| 36 | |
Erik Andersen | 6437170 | 2000-03-04 22:23:27 +0000 | [diff] [blame] | 37 | extern int |
| 38 | freeramdisk_main(int argc, char **argv) |
| 39 | { |
Erik Andersen | 6437170 | 2000-03-04 22:23:27 +0000 | [diff] [blame] | 40 | int f; |
| 41 | |
Eric Andersen | ef4268e | 2000-06-04 05:08:29 +0000 | [diff] [blame] | 42 | if (argc != 2 || *argv[1] == '-') { |
Erik Andersen | 6437170 | 2000-03-04 22:23:27 +0000 | [diff] [blame] | 43 | usage(freeramdisk_usage); |
| 44 | } |
| 45 | |
Eric Andersen | ef4268e | 2000-06-04 05:08:29 +0000 | [diff] [blame] | 46 | if ((f = open(argv[1], O_RDWR)) == -1) { |
Matt Kraai | 1fa1ade | 2000-12-18 03:57:16 +0000 | [diff] [blame] | 47 | perror_msg_and_die("cannot open %s", argv[1]); |
Erik Andersen | 6437170 | 2000-03-04 22:23:27 +0000 | [diff] [blame] | 48 | } |
| 49 | if (ioctl(f, BLKFLSBUF) < 0) { |
Matt Kraai | 1fa1ade | 2000-12-18 03:57:16 +0000 | [diff] [blame] | 50 | perror_msg_and_die("failed ioctl on %s", argv[1]); |
Erik Andersen | 6437170 | 2000-03-04 22:23:27 +0000 | [diff] [blame] | 51 | } |
Erik Andersen | 298854f | 2000-03-23 01:09:18 +0000 | [diff] [blame] | 52 | /* Don't bother closing. Exit does |
| 53 | * that, so we can save a few bytes */ |
| 54 | /* close(f); */ |
Matt Kraai | 3e856ce | 2000-12-01 02:55:13 +0000 | [diff] [blame] | 55 | return EXIT_SUCCESS; |
Erik Andersen | 6437170 | 2000-03-04 22:23:27 +0000 | [diff] [blame] | 56 | } |
| 57 | |
| 58 | /* |
| 59 | Local Variables: |
| 60 | c-file-style: "linux" |
| 61 | c-basic-offset: 4 |
| 62 | tab-width: 4 |
| 63 | End: |
| 64 | */ |
| 65 | |