LXR 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//config:config RDEV
  11//config:       bool "rdev (1.8 kb)"
  12//config:       default y
  13//config:       help
  14//config:       Print the device node associated with the filesystem mounted at '/'.
  15
  16//applet:IF_RDEV(APPLET_NOEXEC(rdev, rdev, BB_DIR_USR_SBIN, BB_SUID_DROP, rdev))
  17
  18//kbuild:lib-$(CONFIG_RDEV) += rdev.o
  19
  20//usage:#define rdev_trivial_usage
  21//usage:       ""
  22//usage:#define rdev_full_usage "\n\n"
  23//usage:       "Print the device node associated with the filesystem mounted at '/'"
  24//usage:
  25//usage:#define rdev_example_usage
  26//usage:       "$ rdev\n"
  27//usage:       "/dev/mtdblock9 /\n"
  28
  29#include "libbb.h"
  30
  31int rdev_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  32int rdev_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
  33{
  34        const char *root_device = find_block_device("/");
  35
  36        if (root_device) {
  37                printf("%s /\n", root_device);
  38                return EXIT_SUCCESS;
  39        }
  40        return EXIT_FAILURE;
  41}
  42