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