release/src/router/busybox/util-linux/rdev.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * rdev - print device node associated with a filesystem
   4  *
   5  * Copyright (c) 2008 Nuovation System Designs, LLC
   6  *   Grant Erickson <gerickson@nuovations.com>
   7  *
   8  * Licensed under GPLv2, see file LICENSE in this source tree.
   9  *
  10  */
  11
  12 //usage:#define rdev_trivial_usage
  13 //usage:       ""
  14 //usage:#define rdev_full_usage "\n\n"
  15 //usage:       "Print the device node associated with the filesystem mounted at '/'"
  16 //usage:
  17 //usage:#define rdev_example_usage
  18 //usage:       "$ rdev\n"
  19 //usage:       "/dev/mtdblock9 /\n"
  20
  21 #include "libbb.h"
  22
  23 int rdev_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  24 int rdev_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
  25 {
  26         const char *root_device = find_block_device("/");
  27
  28         if (root_device) {
  29                 printf("%s /\n", root_device);
  30                 return EXIT_SUCCESS;
  31         }
  32         return EXIT_FAILURE;
  33 }