blob: 0b2098564595d178518aec9ef1240fe3bad8df7a [file] [log] [blame]
/* vi: set sw=4 ts=4: */
* Prints out the previous and the current runlevel.
* Version: @(#)runlevel 1.20 16-Apr-1997 MvS
* This file is part of the sysvinit suite,
* Copyright 1991-1997 Miquel van Smoorenburg.
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
* initially busyboxified by Bernhard Reutner-Fischer
//config:config RUNLEVEL
//config: bool "runlevel (518 bytes)"
//config: default y
//config: depends on FEATURE_UTMP
//config: help
//config: find the current and previous system runlevel.
//config: This applet uses utmp but does not rely on busybox supporing
//config: utmp on purpose. It is used by e.g. emdebian via /etc/init.d/rc.
//applet:IF_RUNLEVEL(APPLET_NOEXEC(runlevel, runlevel, BB_DIR_SBIN, BB_SUID_DROP, runlevel))
//kbuild:lib-$(CONFIG_RUNLEVEL) += runlevel.o
//usage:#define runlevel_trivial_usage
//usage: "[FILE]"
//usage:#define runlevel_full_usage "\n\n"
//usage: "Find the current and previous system runlevel\n"
//usage: "\n"
//usage: "If no utmp FILE exists or if no runlevel record can be found,\n"
//usage: "print \"unknown\""
//usage:#define runlevel_example_usage
//usage: "$ runlevel /var/run/utmp\n"
//usage: "N 2"
#include "libbb.h"
int runlevel_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int runlevel_main(int argc UNUSED_PARAM, char **argv)
struct utmpx *ut;
char prev;
if (argv[1]) utmpxname(argv[1]);
while ((ut = getutxent()) != NULL) {
if (ut->ut_type == RUN_LVL) {
prev = ut->ut_pid / 256;
if (prev == 0) prev = 'N';
printf("%c %c\n", prev, ut->ut_pid % 256);
return 0;
return 1;