mirror of
https://github.com/topjohnwu/ndk-busybox.git
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79 lines
2.8 KiB
C
79 lines
2.8 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* freeramdisk and fdflush implementations for busybox
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*
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* Copyright (C) 2000 and written by Emanuele Caratti <wiz@iol.it>
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* Adjusted a bit by Erik Andersen <andersen@codepoet.org>
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* Unified with fdflush by Tito Ragusa <farmatito@tiscali.it>
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*
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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//config:config FDFLUSH
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//config: bool "fdflush (1.3 kb)"
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//config: default y
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//config: help
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//config: fdflush is only needed when changing media on slightly-broken
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//config: removable media drives. It is used to make Linux believe that a
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//config: hardware disk-change switch has been actuated, which causes Linux to
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//config: forget anything it has cached from the previous media. If you have
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//config: such a slightly-broken drive, you will need to run fdflush every time
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//config: you change a disk. Most people have working hardware and can safely
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//config: leave this disabled.
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//config:
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//config:config FREERAMDISK
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//config: bool "freeramdisk (1.3 kb)"
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//config: default y
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//config: help
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//config: Linux allows you to create ramdisks. This utility allows you to
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//config: delete them and completely free all memory that was used for the
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//config: ramdisk. For example, if you boot Linux into a ramdisk and later
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//config: pivot_root, you may want to free the memory that is allocated to the
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//config: ramdisk. If you have no use for freeing memory from a ramdisk, leave
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//config: this disabled.
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// APPLET_ODDNAME:name main location suid_type help
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//applet:IF_FDFLUSH( APPLET_ODDNAME(fdflush, freeramdisk, BB_DIR_BIN, BB_SUID_DROP, fdflush ))
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//applet:IF_FREERAMDISK(APPLET_NOEXEC(freeramdisk, freeramdisk, BB_DIR_SBIN, BB_SUID_DROP, freeramdisk))
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//kbuild:lib-$(CONFIG_FDFLUSH) += freeramdisk.o
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//kbuild:lib-$(CONFIG_FREERAMDISK) += freeramdisk.o
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//usage:#define freeramdisk_trivial_usage
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//usage: "DEVICE"
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//usage:#define freeramdisk_full_usage "\n\n"
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//usage: "Free all memory used by the specified ramdisk"
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//usage:
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//usage:#define freeramdisk_example_usage
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//usage: "$ freeramdisk /dev/ram2\n"
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//usage:
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//usage:#define fdflush_trivial_usage
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//usage: "DEVICE"
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//usage:#define fdflush_full_usage "\n\n"
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//usage: "Force floppy disk drive to detect disk change"
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#include <sys/mount.h>
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#include "libbb.h"
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/* From <linux/fd.h> */
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#define FDFLUSH _IO(2,0x4b)
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int freeramdisk_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int freeramdisk_main(int argc UNUSED_PARAM, char **argv)
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{
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int fd;
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fd = xopen(single_argv(argv), O_RDWR);
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// Act like freeramdisk, fdflush, or both depending on configuration.
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ioctl_or_perror_and_die(fd,
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((ENABLE_FREERAMDISK && applet_name[1] == 'r') || !ENABLE_FDFLUSH)
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? BLKFLSBUF
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: FDFLUSH,
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NULL, "%s", argv[1]
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);
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if (ENABLE_FEATURE_CLEAN_UP) close(fd);
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return EXIT_SUCCESS;
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}
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