# forward signals to the process.
signal.signal(signal.SIGINT, lambda signum, frame: sp.send_signal(signum))
signal.signal(signal.SIGTERM, lambda signum, frame: sp.send_signal(signum))
signal.signal(signal.SIGQUIT, lambda signum, frame: sp.send_signal(signum))
# forward signals to the process.
signal.signal(signal.SIGINT, lambda signum, frame: sp.send_signal(signum))
signal.signal(signal.SIGTERM, lambda signum, frame: sp.send_signal(signum))
signal.signal(signal.SIGQUIT, lambda signum, frame: sp.send_signal(signum))