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
);