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