blob: 76231df228c76498c962c686af0180c7e633eeec
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 | |
29 | int runlevel_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
30 | int runlevel_main(int argc UNUSED_PARAM, char **argv) |
31 | { |
32 | struct utmp *ut; |
33 | char prev; |
34 | |
35 | if (argv[1]) utmpname(argv[1]); |
36 | |
37 | setutent(); |
38 | while ((ut = getutent()) != 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 | endutent(); |
45 | return 0; |
46 | } |
47 | } |
48 | |
49 | puts("unknown"); |
50 | |
51 | if (ENABLE_FEATURE_CLEAN_UP) |
52 | endutent(); |
53 | return 1; |
54 | } |
55 |