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 |