'This is called with data from the process\'s stdout or stderr pipes. It
checks the status of the errFlag to setermine if stderr should be
logged (default) or dropped.'

def childDataReceived(self, childFD, data):

    if (childFD == 1):
        return self.protocol.dataReceived(data)
    elif ((childFD == 2) and (self.errFlag == StandardErrorBehavior.LOG)):
        log.msg(format='Process    %(executable)r    wrote    stderr    unhandled    by    %(protocol)s:    %(data)s', executable=self.executable, protocol=self.protocol, data=data)
