blkid: add type display for btrfs
[platform/upstream/busybox.git] / 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 }