code: @Override
      public byte getEndOfInputChar() throws UnsupportedCommOperationException {
          byte ret;
  
          logger.fine("getEndOfInputChar()");
          ret = nativeGetEndOfInputChar();
  
          logger.fine("getEndOfInputChar() returns " + ret);
          return (ret);
      }
docs: Extension to CommAPI This is an extension to CommAPI. It may not be
  supported on all operating systems.
  
  @return int the End of Input Character
  @throws UnsupportedCommOperationException on error Anyone know how to do
  this in Unix?