#!/bin/sh

if [ $# -ne 2 ]
then
  exit 1
fi

/bin/dd if=$1 of=$2 bs=8M &
pid=$!

echo "DDPID=$pid"

while true;
do
  sleep 5
  kill -USR1 $pid 1>/dev/null 2>&1
  if [ $? -ne 0 ]
  then
    exit 0
  fi
done

sync