#!/bin/sh
#Kill runaway hildon-home processes.
#Checks processor load of hildon-home every 60 seconds, except when screen is unlocked.
#Kills hildon-home if two of three successive checks show load over threshhold
#Contains some leftover code from earlier versions

if [ -e /home/user/hhkills-prev ] #delete backup log, if it exists
then
	rm /home/user/hhkills-prev
fi

if [ -e /home/user/hhkills ] #rename most recent log to backup, if it exists
then
	mv /home/user/hhkills /home/user/hhkills-prev
fi

echo "Start: " `date` > /home/user/hhkills #start new log

#initialize values
HH1=0
HH2=0
HHTHRESH=50  #Threshhold: hildon-home processor loads above this value will be considered excessive
HHPAUSE=60   #Pause between cycles: the script waits this many seconds between checks

#start loop
while 'true'
do
	#shift previous values down
	HH3=$HH2
	HH2=$HH1

	#get screen lock status
	SCRSTAT=`dbus-send --system --type=method_call --dest="com.nokia.mce" --print-reply "/com/nokia/mce/request" com.nokia.mce.request.get_tklock_mode|awk -F "\"" '/g/ {print $2}'`

	if [ "$SCRSTAT" = "unlocked" ]
	then
		HH1=0 #if the screen is unlocked, clear HH1 and HH2; do nothing else this cycle
		HH2=0
	else
		#get processor load of hildon-home
		HHSTAT=`top -n1 | grep hildon-home | awk '{print $7}'` # | awk -F "." '{print $1}'`  #final part truncates value to integer; moved below
		#echo $HHSTAT #used while debugging: sends HHSTAT as float to stdout
		#truncate HHSTAT to integer
		HHSTAT=`echo $HHSTAT  | awk -F "." '{print $1}'`
		#compare HHSTAT to threshhold, set HH1 if above, clear it otherwise
		if [ "$HHSTAT" -gt "$HHTHRESH" ]
		then 
			HH1=1
			echo "hh  $HHSTAT " `date` >> /home/user/hhkills #writes all above-threshhold values to log. Useful when debugging, but makes for very large log.
		else
			HH1=0
		fi
		HHSUM=`expr $HH1 + $HH2 + $HH3`
		#echo $HHSUM #sometimes useful when debugging: sends sum to stdout
		#check if HH1, HH2 and HH3 have all been set. If so, kill hildon-home and log the kill
		if [ "$HHSUM" -ge "2"  ]
		then
			#kill hildon-home and log the kill
			killall hildon-home
			echo "Kill: " `date` >> /home/user/hhkills
			HH1=0  #clear these values and give hildon-home a minute to restart and stabilize
			HH2=0
			sleep 60 
		fi
	fi

	#pause before next cycle
	sleep "$HHPAUSE"

done