NAME
	block_input - block input on a connection

SYNOPSIS
	void block_input(int flag)


DESCRIPTION
	Block or unblock input from the port or connection associated with
        the current object, depending on whether the argument is non-zero or
        zero, respectively.
        For port-objects blocking input means no new connections will be
        accepted, so no connection() calls.   With connection-objects this
        means no receive_message(), process_message(), receive_datagram(),
        or process_datagram() calls.
