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#!/system/xbin/bb/ash

WAIT_RUNNING=1 # oom_adj check delay in seconds

WAIT_APPDETECT=20 # app detection delay in seconds

ADJ=1 # forces app's oom_adj to always be <= this

# standard for android:

# 0: foreground app

# 1-2: background service (connectbot = 1, google apps = 2)

# 7: app in backround

# 8: old bg app

APP="com.android.browser" # override with: 'hold com.name.of.app'

#LOGFILE="/sdcard/hold.log" # default: nothing

#PIDDIR="/sdcard" # default: /sqlite_stmt_journals (RAMdisk), will be '/sqlite_stmt_journals/hold-com.android.browser.pid'

#BUSYBOX=/opt/bin/busybox # default: path-search

if [ ! -e "$BUSYBOX" ]; then

if ! BUSYBOX=`which zbusybox`; then

export PATH="/system/xbin:/system/xbin/bb:/system/bin:/opt/bin:/data/local:/data/local/bin:$PATH"

if ! BUSYBOX=`which busybox`; then echo "Cannot find busybox! Bailing." > /dev/tty;exit 1;fi

fi

fi

if [ "x$LOGFILE" != "x" ]; then

l() {

echo "$@" >> $LOGFILE

echo "$@"

}

else

l() {

echo "$@"

}

fi

pidstuff() {

if [ "x$PIDDIR" = "x" ]; then

for d in "/sqlite_stmt_journals" "/data/local" "/system/sd" "/system/sd-ext" "/sdcard"; do

if [ -w "$d" ] && [ -d "$d" ]; then

PIDDIR="$d"

break

fi

done

fi

if [ "x$PIDDIR" = "x" ]; then

echo > /dev/tty

echo "Cannot find a place to write a .pid file, bailing." > /dev/tty; exit 1;

fi

PIDFILE="${PIDDIR}/hold-${APP}.pid"

}

pidkill() {

if [ -e "$PIDFILE" ]; then

oldpid=`cat $PIDFILE`

if [ "x$oldpid" != "x" ]; then

kill $oldpid 2> /dev/null

l "kill-old($oldpid): $?"

fi

fi

}

#######################

main() {

if [ "x$1" != "x" ]; then

APP="$1"

fi

pidstuff

l "$0: start - APP=$APP, BUSYBOX=$BUSYBOX, PIDFILE=$PIDFILE, LOGFILE=$LOGFILE";

pidkill

echo $$ > $PIDFILE

WAIT=$WAIT_APPDETECT

while : ; do

if [ "x$CMDLINE" != "x" ]; then

adj=$(cat /proc/$PID/oom_adj)

if [ $? -eq 0 ]; then

echo "[debug]: check /proc/$PID/oom_adj"

if [ $adj -gt $ADJ ]; then

echo $ADJ > /proc/$PID/oom_adj

l "$APP($PID): $adj -> $ADJ"

fi

else

unset PID

unset CMDLINE

WAIT=$WAIT_APPDETECT

l "$APP: lost"

fi

fi

if [ "x$PID" = "x" ]; then

PID=$($BUSYBOX pidof $APP)

echo "[debug]: pid $APP($?): $PID"

if [ "x$PID" != "x" ]; then

l "$APP($PID): found"

CMDLINE="/proc/$PID/cmdline"

WAIT=$WAIT_RUNNING

fi

fi

sleep $WAIT

done

}

#######################

if [ "x$1" = "x-k" ]; then

if [ "x$2" != "x" ]; then APP="$2"; fi

pidstuff

pidkill

elif [ "x$1" = "x-n" ]; then

main "$2"

elif [ "x$1" = "x-c" ]; then

if [ "x$2" != "x" ]; then APP="$2"; fi

pidstuff

if [ -e "$PIDFILE" ]; then

oldpid=`cat $PIDFILE`

if [ "x$oldpid" != "x" ]; then

cat /proc/$oldpid/cmdline| $BUSYBOX tr '\0' ' ' |

$BUSYBOX grep -q "$0.*$APP"

if [ $? -eq 0 ]; then

echo "$0 is running for $APP, pid: $oldpid"; exit 0

fi

fi

fi

echo "$0 is not running for $APP"; exit 1

else

if [ "x$1" != "x" ]; then APP="$1"; fi

$BUSYBOX nohup echo test > /dev/null

if [ $? != 0 ]; then echo "Problem with '$BUSYBOX nohup', returned: $!"; exit 1; fi

$BUSYBOX nohup $0 -n "$APP" 2> /dev/null 1> /dev/null &

echo "Launched into the background for '$APP'. Pid: $!"

fi