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/* 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. */ //config:config FDFLUSH //config: bool "fdflush (1.6 kb)" //config: default y //config: help //config: fdflush is only needed when changing media on slightly-broken //config: removable media drives. It is used to make Linux believe that a //config: hardware disk-change switch has been actuated, which causes Linux to //config: forget anything it has cached from the previous media. If you have //config: such a slightly-broken drive, you will need to run fdflush every time //config: you change a disk. Most people have working hardware and can safely //config: leave this disabled. //config: //config:config FREERAMDISK //config: bool "freeramdisk (1.6 kb)" //config: default y //config: help //config: Linux allows you to create ramdisks. This utility allows you to //config: delete them and completely free all memory that was used for the //config: ramdisk. For example, if you boot Linux into a ramdisk and later //config: pivot_root, you may want to free the memory that is allocated to the //config: ramdisk. If you have no use for freeing memory from a ramdisk, leave //config: this disabled. // APPLET_ODDNAME:name main location suid_type help //applet:IF_FDFLUSH( APPLET_ODDNAME(fdflush, freeramdisk, BB_DIR_BIN, BB_SUID_DROP, fdflush )) //applet:IF_FREERAMDISK(APPLET_NOEXEC(freeramdisk, freeramdisk, BB_DIR_SBIN, BB_SUID_DROP, freeramdisk)) //kbuild:lib-$(CONFIG_FDFLUSH) += freeramdisk.o //kbuild:lib-$(CONFIG_FREERAMDISK) += freeramdisk.o //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; } |