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1#!/bin/sh
2### BEGIN INIT INFO
3# Provides: hwclock
4# Required-Start:
5# Required-Stop: $local_fs
6# Default-Start: S
7# Default-Stop: 0 6
8# Short-Description: Set system clock
9# Description: Set system clock to hardware clock, according to the UTC
10# setting in /etc/default/rcS (see also rcS(5)).
11### END INIT INFO
12#
13# WARNING: If your hardware clock is not in UTC/GMT, this script
14# must know the local time zone. This information is
15# stored in /etc/localtime. This might be a problem if
16# your /etc/localtime is a symlink to something in
17# /usr/share/zoneinfo AND /usr isn't in the root
18# partition! The workaround is to define TZ either
19# in /etc/default/rcS, or in the proper place below.
20
21[ ! -x /sbin/hwclock ] && exit 0
22
23[ -f /etc/default/rcS ] && . /etc/default/rcS
24
25[ "$UTC" = "yes" ] && tz="--utc" || tz="--localtime"
26case "$1" in
27 start)
28 if [ "$VERBOSE" != no ]
29 then
30 echo "System time was `date`."
31 echo "Setting the System Clock using the Hardware Clock as reference..."
32 fi
33
34 if [ "$HWCLOCKACCESS" != no ]
35 then
36 if [ -z "$TZ" ]
37 then
38 hwclock $tz --hctosys
39 else
40 TZ="$TZ" hwclock $tz --hctosys
41 fi
42 fi
43
44 if [ "$VERBOSE" != no ]
45 then
46 echo "System Clock set. System local time is now `date`."
47 fi
48 ;;
49 stop|restart|reload|force-reload)
50 #
51 # Updates the Hardware Clock with the System Clock time.
52 # This will *override* any changes made to the Hardware Clock.
53 #
54 # WARNING: If you disable this, any changes to the system
55 # clock will not be carried across reboots.
56 #
57 if [ "$VERBOSE" != no ]
58 then
59 echo "Saving the System Clock time to the Hardware Clock..."
60 fi
61 if [ "$HWCLOCKACCESS" != no ]
62 then
63 hwclock $tz --systohc
64 fi
65 if [ "$VERBOSE" != no ]
66 then
67 echo "Hardware Clock updated to `date`."
68 fi
69 exit 0
70 ;;
71 show)
72 if [ "$HWCLOCKACCESS" != no ]
73 then
74 hwclock $tz --show
75 fi
76 ;;
77 *)
78 echo "Usage: hwclock.sh {start|stop|show|reload|restart}" >&2
79 echo " start sets kernel (system) clock from hardware (RTC) clock" >&2
80 echo " stop and reload set hardware (RTC) clock from kernel (system) clock" >&2
81 exit 1
82 ;;
83esac