NAME
        KBD_READEVENT -- Return the next keyboard event.

   FUNCTION
        read raw keyboard events from the keyboard and put them in the
        data area of the iORequest.  If there are no pending keyboard
        events, this command will not be satisfied, but if there are
        some events, but not as many as can fill IO_LENGTH, the
        request will be satisfied with those currently available.

   IO REQUEST
        io_Message      mn_ReplyPort set if quick I/O is not possible
        io_Device       preset by the call to opendevice
        io_Command      KBD_READEVENT
        io_Flags        IOB_QUICK set if quick I/O is possible
        io_Length       the size of the io_Data area in bytes: there
                        are sizeof(inputEvent) bytes per input event.
        io_Data         a buffer area to fill with input events.  The
                        fields of the input event are:
            ie_NextEvent
                        links the events returned
            ie_Class
                        is IECLASS_RAWKEY
            ie_Code
                        contains the next key up/down reports
            ie_Qualifier
                        only the shift and numeric pad bits are set
            ie_SubClass, ie_X, ie_Y, ie_TimeStamp
                        are not used, and set to zero

   RESULTS
        This function sets the error field in the iorequest, and fills
        the iorequest with the next keyboard events (but not partial
        events).