static void send_sigio_to_port(struct port *port)
{
	if (port->async_queue && port->guest_connected)
		kill_fasync(&port->async_queue, SIGIO, POLL_OUT);
}
static void send_sigio_to_port(struct port *port)
{
	if (port->async_queue && port->guest_connected)
		kill_fasync(&port->async_queue, SIGIO, POLL_OUT);
}