busybox

/* vi: set sw=4 ts=4: */

/*

 * freeramdisk implementation for busybox

 *

 * Copyright (C) 2000 and written by Emanuele Caratti <wiz@iol.it>

 * Adjusted a bit by Erik Andersen <andersen@codepoet.org>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

 * General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

 *

 */

​

#include <stdio.h>

#include <string.h>

#include <sys/types.h>

#include <fcntl.h>

#include <sys/ioctl.h>

#include <stdlib.h>

#include <unistd.h>

#include "busybox.h"

​

​

/* From linux/fs.h */

#define BLKFLSBUF  _IO(0x12,97) /* flush buffer cache */

​

extern int

freeramdisk_main(int argc, char **argv)

{

    int result;

    int fd;

​

    if (argc != 2) {

        bb_show_usage();

    }

​

    fd = bb_xopen(argv[1], O_RDWR);

​

    result = ioctl(fd, BLKFLSBUF);

#ifdef CONFIG_FEATURE_CLEAN_UP

    close(fd);

#endif

    if (result < 0) {

        bb_perror_msg_and_die("failed ioctl on %s", argv[1]);

    }

​

    /* Don't bother closing.  Exit does

     * that, so we can save a few bytes */

    return EXIT_SUCCESS;

}

​

/*

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