LXR busybox/miscutils/runlevel.c

   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
  15//usage:#define runlevel_trivial_usage
  16//usage:       "[FILE]"
  17//usage:#define runlevel_full_usage "\n\n"
  18//usage:       "Find the current and previous system runlevel\n"
  19//usage:       "\n"
  20//usage:       "If no utmp FILE exists or if no runlevel record can be found,\n"
  21//usage:       "print \"unknown\""
  22//usage:
  23//usage:#define runlevel_example_usage
  24//usage:       "$ runlevel /var/run/utmp\n"
  25//usage:       "N 2"
  26
  27#include "libbb.h"
  28
  29int runlevel_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  30int runlevel_main(int argc UNUSED_PARAM, char **argv)
  31{
  32        struct utmpx *ut;
  33        char prev;
  34
  35        if (argv[1]) utmpxname(argv[1]);
  36
  37        setutxent();
  38        while ((ut = getutxent()) != NULL) {
  39                if (ut->ut_type == RUN_LVL) {
  40                        prev = ut->ut_pid / 256;
  41                        if (prev == 0) prev = 'N';
  42                        printf("%c %c\n", prev, ut->ut_pid % 256);
  43                        if (ENABLE_FEATURE_CLEAN_UP)
  44                                endutxent();
  45                        return 0;
  46                }
  47        }
  48
  49        puts("unknown");
  50
  51        if (ENABLE_FEATURE_CLEAN_UP)
  52                endutxent();
  53        return 1;
  54}
  55