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70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
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/* vi: set sw=4 ts=4: */
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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 tarball for details.
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*/
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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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