#!/bin/sh
######################################################################
#
# description: kill pppd and remove linked file
#
export COLUMNS=256
LOGFILE="/tmp/lcActiveUSBModem.log"
echo " start to kill pppd!!! ====" >> $LOGFILE

if [ "$1" = "" ]; then
	echo " ERROR: Parameter error" >> $LOGFILE
	echo " Usage: $0 <device_filename>" >> $LOGFILE
	echo " eg: $0 /dev/ttyUSB0" >> $LOGFILE
	exit 1
else
	DEVICE=$1
fi
######################################################################
#

PID=`ps -ef | grep -v grep | grep -v kill-pppd |grep "$DEVICE" | grep "pppd" | awk '{ print $2; exit }'`

if test $PID; then
	echo " kill pppd pid $PID " >> $LOGFILE
        kill -TERM $PID

        sleep 2s

        PID=`ps -ef | grep -v grep | grep "$DEVICE" | grep "pppd" | awk '{ print $2; exit }'`
       if test $PID; then
                echo " ERROR: Terminated ppp link to $DEVICE first failed /proc/$PID" >> $LOGFILE
                kill -KILL $PID
                sleep 0.1s
                rm -f /var/run/ppp-LcPhone.pid
                rm -f /dev/lc_ppp_up
                if [ -d "/proc/$PID" ]; then
	           echo " ERROR: Terminated ppp link to $DEVICE second failed /proc/$PID" >> $LOGFILE
                   exit 3
                fi

        fi
#
# Success. wait 3 seconds to let pppd clean up its own junk.
        echo " PPP link to $DEVICE terminated" >> $LOGFILE
        exit 0
fi
#
echo " ERROR: PPP link is not active on $DEVICE" >> $LOGFILE
exit 2