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#!/bin/sh
# hwclock.sh Set and adjust the CMOS clock, according to the UTC
# setting in /etc/default/rcS (see also rcS(5)).
#
# Version: @(#)hwclock.sh 2.00 14-Dec-1998 miquels@cistron.nl
#
# Patches:
# 2000-01-30 Henrique M. Holschuh <hmh@rcm.org.br>
# - Minor cosmetic changes in an attempt to help new
# users notice something IS changing their clocks
# during startup/shutdown.
# - Added comments to alert users of hwclock issues
# and discourage tampering without proper doc reading.
# WARNING: Please read /usr/doc/util-linux/README.Debian.hwclock
# before changing this file. You risk serious clock
# misbehaviour otherwise.
. /etc/default/rcS
[ "$GMT" = "-u" ] && UTC="yes"
case "$UTC" in
no|"") GMT="--localtime" ;;
yes) GMT="--utc" ;;
*) echo "$0: unknown UTC setting: \"$UTC\"" >&2 ;;
esac
case "$1" in
start)
if [ ! -f /etc/adjtime ]
then
echo "0.0 0 0.0" > /etc/adjtime
fi
# Uncomment the hwclock --adjust line below if you want
# hwclock to try to correct systematic drift errors in the
# Hardware Clock.
#
# WARNING: If you uncomment this option, you must either make
# sure *nothing* changes the Hardware Clock other than
# hwclock --systohc, or you must delete /etc/adjtime
# every time someone else modifies the Hardware Clock.
#
# Common "vilains" are: ntp, MS Windows, the BIOS Setup
# program.
#
# WARNING: You must remember to invalidate (delete)
# /etc/adjtime if you ever need to set the system clock
# to a very different value and hwclock --adjust is being
# used.
#
# Please read /usr/doc/util-linux/README.Debian.hwclock
# before enablig hwclock --adjust.
#
# hwclock --adjust $GMT
if [ "$VERBOSE" != no ]
then
echo
echo "Setting the System Clock using the Hardware Clock as reference..."
fi
# Copies Hardware Clock time to System Clock using the correct
# timezone for hardware clocks in local time, and sets kernel
# timezone. DO NOT REMOVE.
hwclock --hctosys $GMT
#
# Now that /usr/lib/zoneinfo should be available,
# announce the local time.
#
if [ "$VERBOSE" != no ]
then
echo "System Clock set. Local time: `date`"
echo
fi
;;
stop|restart|reload)
#
# Updates the Hardware Clock with the System Clock time.
# This will *override* any changes made to the Hardware Clock.
#
# WARNING: If you disable this, any changes to the system
# clock will not be carried across reboots.
#
if [ "$VERBOSE" != no ]
then
echo "Saving the System Clock time to the Hardware Clock..."
fi
[ "$GMT" = "-u" ] && GMT="--utc"
hwclock --systohc $GMT
if [ "$VERBOSE" != no ]
then
echo "Hardware Clock updated to `date`."
fi
;;
show)
hwclock --show $GMT
;;
*)
echo "Usage: hwclock.sh {start|stop|reload|show}" >&2
echo " start sets kernel (system) clock from hardware (RTC) clock" >&2
echo " stop and reload set hardware (RTC) clock from kernel (system) clock" >&2
exit 1
;;
esac
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