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