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74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* freeramdisk implementation for busybox
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*
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* Copyright (C) 2000 and written by Emanuele Caratti <wiz@iol.it>
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* Adjusted a bit by Erik Andersen <andersee@debian.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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#include "internal.h"
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/* From linux/fs.h */
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#define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
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static const char freeramdisk_usage[] =
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"freeramdisk DEVICE\n"
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#ifndef BB_FEATURE_TRIVIAL_HELP
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"\nFrees all memory used by the specified ramdisk.\n"
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#endif
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;
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extern int
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freeramdisk_main(int argc, char **argv)
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{
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int f;
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if (argc != 2 || *argv[1] == '-') {
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usage(freeramdisk_usage);
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}
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if ((f = open(argv[1], O_RDWR)) == -1) {
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fatalError( "freeramdisk: cannot open %s: %s\n", argv[1], strerror(errno));
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}
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if (ioctl(f, BLKFLSBUF) < 0) {
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fatalError( "freeramdisk: failed ioctl on %s: %s\n", argv[1], strerror(errno));
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}
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/* Don't bother closing. Exit does
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* that, so we can save a few bytes */
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/* close(f); */
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return(TRUE);
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}
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/*
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Local Variables:
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c-file-style: "linux"
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c-basic-offset: 4
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tab-width: 4
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End:
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*/
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