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https://git.busybox.net/busybox.git
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104 lines
3.1 KiB
C
104 lines
3.1 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Ported to busybox from mtd-utils.
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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 FLASH_LOCK
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//config: bool "flash_lock (2.1 kb)"
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//config: default n # doesn't build on Ubuntu 8.04
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//config: help
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//config: The flash_lock binary from mtd-utils as of git head 5ec0c10d0. This
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//config: utility locks part or all of the flash device.
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//config:
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//config:config FLASH_UNLOCK
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//config: bool "flash_unlock (1.3 kb)"
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//config: default n # doesn't build on Ubuntu 8.04
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//config: help
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//config: The flash_unlock binary from mtd-utils as of git head 5ec0c10d0. This
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//config: utility unlocks part or all of the flash device.
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// APPLET_ODDNAME:name main location suid_type help
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//applet:IF_FLASH_LOCK( APPLET_ODDNAME(flash_lock, flash_lock_unlock, BB_DIR_USR_SBIN, BB_SUID_DROP, flash_lock))
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//applet:IF_FLASH_UNLOCK(APPLET_ODDNAME(flash_unlock, flash_lock_unlock, BB_DIR_USR_SBIN, BB_SUID_DROP, flash_unlock))
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/* not NOEXEC: if flash operation stalls, use less memory in "hung" process */
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//kbuild:lib-$(CONFIG_FLASH_LOCK) += flash_lock_unlock.o
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//kbuild:lib-$(CONFIG_FLASH_UNLOCK) += flash_lock_unlock.o
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//usage:#define flash_lock_trivial_usage
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//usage: "MTD_DEVICE OFFSET SECTORS"
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//usage:#define flash_lock_full_usage "\n\n"
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//usage: "Lock part or all of an MTD device. If SECTORS is -1, then all sectors\n"
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//usage: "will be locked, regardless of the value of OFFSET"
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//usage:
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//usage:#define flash_unlock_trivial_usage
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//usage: "MTD_DEVICE"
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//usage:#define flash_unlock_full_usage "\n\n"
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//usage: "Unlock an MTD device"
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#include "libbb.h"
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#include <mtd/mtd-user.h>
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int flash_lock_unlock_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int flash_lock_unlock_main(int argc UNUSED_PARAM, char **argv)
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{
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/* note: fields in these structs are 32-bits.
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* apparently we can't win anything by using off_t
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* or long long's for offset and/or sectors vars. */
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struct mtd_info_user info;
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struct erase_info_user lock;
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unsigned long offset;
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long sectors;
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int fd;
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#define do_lock (ENABLE_FLASH_LOCK && (!ENABLE_FLASH_UNLOCK || (applet_name[6] == 'l')))
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if (!argv[1])
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bb_show_usage();
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/* parse offset and number of sectors to lock */
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offset = 0;
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sectors = -1;
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if (do_lock) {
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if (!argv[2] || !argv[3])
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bb_show_usage();
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offset = xstrtoul(argv[2], 0);
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sectors = xstrtol(argv[3], 0);
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}
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fd = xopen(argv[1], O_RDWR);
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xioctl(fd, MEMGETINFO, &info);
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lock.start = 0;
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lock.length = info.size;
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if (do_lock) {
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unsigned long size = info.size - info.erasesize;
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if (offset > size) {
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bb_error_msg_and_die("%lx is beyond device size %lx\n",
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offset, size);
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}
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if (sectors == -1) {
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sectors = info.size / info.erasesize;
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} else {
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// isn't this useless?
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unsigned long num = info.size / info.erasesize;
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if (sectors > num) {
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bb_error_msg_and_die("%ld are too many "
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"sectors, device only has "
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"%ld\n", sectors, num);
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}
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}
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lock.start = offset;
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lock.length = sectors * info.erasesize;
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xioctl(fd, MEMLOCK, &lock);
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} else {
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xioctl(fd, MEMUNLOCK, &lock);
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}
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return EXIT_SUCCESS;
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}
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