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