1 /* vi: set sw=4 ts=4: */
3 * freeramdisk implementation for busybox
5 * Copyright (C) 2000 and written by Emanuele Caratti <wiz@iol.it>
6 * Adjusted a bit by Erik Andersen <andersee@debian.org>
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.
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.
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
27 #include <sys/types.h>
30 #include <sys/ioctl.h>
36 static const char freeramdisk_usage[] =
37 "freeramdisk DEVICE\n"
38 #ifndef BB_FEATURE_TRIVIAL_HELP
39 "\nFrees all memory used by the specified ramdisk.\n"
44 freeramdisk_main(int argc, char **argv)
46 char rname[256] = "/dev/ram";
49 if (argc < 2 || ( argv[1] && *argv[1] == '-')) {
50 usage(freeramdisk_usage);
54 strcpy(rname, argv[1]);
56 if ((f = open(rname, O_RDWR)) == -1) {
57 fatalError( "freeramdisk: cannot open %s: %s\n", rname, strerror(errno));
59 if (ioctl(f, BLKFLSBUF) < 0) {
60 fatalError( "freeramdisk: failed ioctl on %s: %s\n", rname, strerror(errno));
62 /* Don't bother closing. Exit does
63 * that, so we can save a few bytes */