blob: 0e1578e33038eb46a7f16563b71ef0e96b9aa979
| 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 | //config:config RDEV |
| 12 | //config: bool "rdev" |
| 13 | //config: default y |
| 14 | //config: help |
| 15 | //config: Print the device node associated with the filesystem mounted at '/'. |
| 16 | |
| 17 | //applet:IF_RDEV(APPLET(rdev, BB_DIR_USR_SBIN, BB_SUID_DROP)) |
| 18 | |
| 19 | //kbuild:lib-$(CONFIG_RDEV) += rdev.o |
| 20 | |
| 21 | //usage:#define rdev_trivial_usage |
| 22 | //usage: "" |
| 23 | //usage:#define rdev_full_usage "\n\n" |
| 24 | //usage: "Print the device node associated with the filesystem mounted at '/'" |
| 25 | //usage: |
| 26 | //usage:#define rdev_example_usage |
| 27 | //usage: "$ rdev\n" |
| 28 | //usage: "/dev/mtdblock9 /\n" |
| 29 | |
| 30 | #include "libbb.h" |
| 31 | |
| 32 | int rdev_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| 33 | int rdev_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
| 34 | { |
| 35 | const char *root_device = find_block_device("/"); |
| 36 | |
| 37 | if (root_device) { |
| 38 | printf("%s /\n", root_device); |
| 39 | return EXIT_SUCCESS; |
| 40 | } |
| 41 | return EXIT_FAILURE; |
| 42 | } |
| 43 |