num_mess.i4.v = cmu_empty_box(mailbox_name.i1a.r)

	This routine will empty a mailbox.

	mailbox_name	mailbox name (CMU_NAMLEN characters)

	This function returns status values as follows:

	CMU_NOMB		not connected to this mailbox
	CMU_SYSERR		Unix system error
	otherwise		number of messages deleted

	This function requires the following include files:

	clib_h, acnet_errors_h

	Related functions:

	cmu_connect, cmu_disconnect, cmu_receive, cmu_send

	C/C++ usage:

	static const char	mailbox_name[CMU_NAMLEN+1] = "mailbox_name";
	int	num_mess;

	num_mess = cmu_empty_box(mailbox_name);