How do I kill a remote login session as well as processes started inside it?

Issue

• How do I kill a remote login session as well as processes started inside it?
• If the user terminates the SSH session by hitting the X button, it leaves the script processes running.
• How can I configure the .profile to clean up (kill) the processes if the user terminates the SSH session?
• We have added below script inside .profile which is not working:

set -x
PATH=$PATH:$HOME/bin
export PATH
trap "kill -15 0; exit" EXIT INT HUP
scriptname
kill -15 0