| /* 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 (559 bytes)" |
| //config: default y |
| //config: depends on FEATURE_UTMP |
| //config: help |
| //config: Find the current and previous system runlevel. |
| //config: |
| //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-$(CONFIG_RUNLEVEL) += runlevel.o |
| |
| //usage:#define runlevel_trivial_usage |
| //usage: "[FILE]" |
| //usage:#define runlevel_full_usage "\n\n" |
| //usage: "Find the current and previous system runlevel\n" |
| //usage: "\n" |
| //usage: "If no utmp FILE exists or if no runlevel record can be found,\n" |
| //usage: "print \"unknown\"" |
| //usage: |
| //usage:#define runlevel_example_usage |
| //usage: "$ 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]); |
| |
| setutxent(); |
| 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); |
| if (ENABLE_FEATURE_CLEAN_UP) |
| endutxent(); |
| return 0; |
| } |
| } |
| |
| puts("unknown"); |
| |
| if (ENABLE_FEATURE_CLEAN_UP) |
| endutxent(); |
| return 1; |
| } |