widgets.py 文件源码

def watch_file(self, fd, callback, flags=zmq.POLLIN):
        """
        Call *callback* when *fd* has some data to read. No parameters are
        passed to the callback. The *flags* are as for :meth:`watch_queue`.

        :param fd:
            The file-like object, or fileno to monitor.

        :param callback:
            The function to call when the file has data available.

        :param int flags:
            The condition to monitor on the file (defaults to ``POLLIN``).
        """
        if isinstance(fd, int):
            fd = os.fdopen(fd)
        self._poller.register(fd, flags)
        self._queue_callbacks[fd.fileno()] = callback
        return fd