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from socket import error as SocketError 

try: 

    from select import poll, POLLIN 

except ImportError:  # `poll` doesn't exist on OSX and other platforms 

    poll = False 

    try: 

        from select import select 

    except ImportError:  # `select` doesn't exist on AppEngine. 

        select = False 

 

def is_connection_dropped(conn):  # Platform-specific 

    """ 

    Returns True if the connection is dropped and should be closed. 

 

    :param conn: 

        :class:`httplib.HTTPConnection` object. 

 

    Note: For platforms like AppEngine, this will always return ``False`` to 

    let the platform handle connection recycling transparently for us. 

    """ 

    sock = getattr(conn, 'sock', False) 

    if sock is False:  # Platform-specific: AppEngine 

        return False 

    if sock is None:  # Connection already closed (such as by httplib). 

        return False 

 

    if not poll: 

        if not select:  # Platform-specific: AppEngine 

            return False 

 

        try: 

            return select([sock], [], [], 0.0)[0] 

        except SocketError: 

            return True 

 

    # This version is better on platforms that support it. 

    p = poll() 

    p.register(sock, POLLIN) 

    for (fno, ev) in p.poll(0.0): 

        if fno == sock.fileno(): 

            # Either data is buffered (bad), or the connection is dropped. 

            return True