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GetCommEventMask     Get Current Event Mask

WORD bGetCommEventMask(nCid, nEvtMask)
int nCid; /* from OpenComm */
int nEvtMask; /* Specify bits to be enabled */

Returns:    Current event mask.

        |---------------------------------------|
        |EV_RXCHAR   Any Character received     |
        |EV_RXFLAG   Received certain character |
        |EV_TXEMPTY  Transmit Queue Empty       |
        |EV_CTS      CTS changed state          |
        |EV_DSR      DSR changed state          |
        |EV_RLSD     RLSD changed state         |
        |EV_BREAK    BREAK received             |
        |EV_ERR      Line status error occurred |
        |EV_RING     Ring signal detected       |
        |EV_PERR     Printer error occurred     |
        +---------------------------------------+