Kill all child processes from shell script

Small and simple script. Creates Ctrl-C trap and kills all it's child processes in it. Nice to have when your script has many child processes which execution have to be stopped when main script is interrupted by Ctrl-C or other signal.

kill_child_processes() {
    isTopmost=$1
    curPid=$2
    childPids=`ps -o pid --no-headers --ppid ${curPid}`
    for childPid in $childPids
    do
        kill_child_processes 0 $childPid
    done
    if [ $isTopmost -eq 0 ]; then
        kill -9 $curPid 2> /dev/null
    fi
}

# Ctrl-C trap. Catches INT signal
trap "kill_child_processes 1 $$; exit 0" INT

for ((  i = 0 ;  i <= 5;  i++  ))
do
  # do something...
  sleep 10 &
done

wait