network.py 文件源码

def socket_closed(sock):
    """Return True if we know socket has been closed, False otherwise.
    """
    try:
        if _HAS_POLL:
            _poller.register(sock, _EVENT_MASK)
            rd = _poller.poll(0)
            _poller.unregister(sock)
        else:
            rd, _, _ = select.select([sock], [], [], 0)
    # Any exception here is equally bad (select.error, ValueError, etc.).
    except:
        return True
    return len(rd) > 0