blob: b6412a6ea4ddbd86bb89bb6cba840d38e920794f
| 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
| 3 | * Prints out the previous and the current runlevel. |
| 4 | * |
| 5 | * Version: @(#)runlevel 1.20 16-Apr-1997 MvS |
| 6 | * |
| 7 | * This file is part of the sysvinit suite, |
| 8 | * Copyright 1991-1997 Miquel van Smoorenburg. |
| 9 | * |
| 10 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| 11 | * |
| 12 | * initially busyboxified by Bernhard Reutner-Fischer |
| 13 | */ |
| 14 | //config:config RUNLEVEL |
| 15 | //config: bool "runlevel" |
| 16 | //config: default y |
| 17 | //config: depends on FEATURE_UTMP |
| 18 | //config: help |
| 19 | //config: find the current and previous system runlevel. |
| 20 | //config: |
| 21 | //config: This applet uses utmp but does not rely on busybox supporing |
| 22 | //config: utmp on purpose. It is used by e.g. emdebian via /etc/init.d/rc. |
| 23 | |
| 24 | //applet:IF_RUNLEVEL(APPLET(runlevel, BB_DIR_SBIN, BB_SUID_DROP)) |
| 25 | |
| 26 | //kbuild:lib-$(CONFIG_RUNLEVEL) += runlevel.o |
| 27 | |
| 28 | //usage:#define runlevel_trivial_usage |
| 29 | //usage: "[FILE]" |
| 30 | //usage:#define runlevel_full_usage "\n\n" |
| 31 | //usage: "Find the current and previous system runlevel\n" |
| 32 | //usage: "\n" |
| 33 | //usage: "If no utmp FILE exists or if no runlevel record can be found,\n" |
| 34 | //usage: "print \"unknown\"" |
| 35 | //usage: |
| 36 | //usage:#define runlevel_example_usage |
| 37 | //usage: "$ runlevel /var/run/utmp\n" |
| 38 | //usage: "N 2" |
| 39 | |
| 40 | #include "libbb.h" |
| 41 | |
| 42 | int runlevel_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| 43 | int runlevel_main(int argc UNUSED_PARAM, char **argv) |
| 44 | { |
| 45 | struct utmpx *ut; |
| 46 | char prev; |
| 47 | |
| 48 | if (argv[1]) utmpxname(argv[1]); |
| 49 | |
| 50 | setutxent(); |
| 51 | while ((ut = getutxent()) != NULL) { |
| 52 | if (ut->ut_type == RUN_LVL) { |
| 53 | prev = ut->ut_pid / 256; |
| 54 | if (prev == 0) prev = 'N'; |
| 55 | printf("%c %c\n", prev, ut->ut_pid % 256); |
| 56 | if (ENABLE_FEATURE_CLEAN_UP) |
| 57 | endutxent(); |
| 58 | return 0; |
| 59 | } |
| 60 | } |
| 61 | |
| 62 | puts("unknown"); |
| 63 | |
| 64 | if (ENABLE_FEATURE_CLEAN_UP) |
| 65 | endutxent(); |
| 66 | return 1; |
| 67 | } |
| 68 |