1 /* vi: set sw=4 ts=4: */
3 * freeramdisk and fdflush implementations for busybox
5 * Copyright (C) 2000 and written by Emanuele Caratti <wiz@iol.it>
6 * Adjusted a bit by Erik Andersen <andersen@codepoet.org>
7 * Unified with fdflush by Tito Ragusa <farmatito@tiscali.it>
9 * Licensed under GPLv2, see file LICENSE in this source tree.
12 //usage:#define freeramdisk_trivial_usage
14 //usage:#define freeramdisk_full_usage "\n\n"
15 //usage: "Free all memory used by the specified ramdisk"
17 //usage:#define freeramdisk_example_usage
18 //usage: "$ freeramdisk /dev/ram2\n"
20 //usage:#define fdflush_trivial_usage
22 //usage:#define fdflush_full_usage "\n\n"
23 //usage: "Force floppy disk drive to detect disk change"
25 #include <sys/mount.h>
28 /* From <linux/fd.h> */
29 #define FDFLUSH _IO(2,0x4b)
31 int freeramdisk_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
32 int freeramdisk_main(int argc UNUSED_PARAM, char **argv)
36 fd = xopen(single_argv(argv), O_RDWR);
38 // Act like freeramdisk, fdflush, or both depending on configuration.
39 ioctl_or_perror_and_die(fd, (ENABLE_FREERAMDISK && applet_name[1] == 'r')
40 || !ENABLE_FDFLUSH ? BLKFLSBUF : FDFLUSH, NULL, "%s", argv[1]);
42 if (ENABLE_FEATURE_CLEAN_UP) close(fd);