def gpib_control_atn(library, session, mode):
    """Specifies the state of the ATN line and the local active controller state.

    Corresponds to viGpibControlATN function of the VISA library.

    :param library: the visa library wrapped by ctypes.
    :param session: Unique logical identifier to a session.
    :param mode: Specifies the state of the ATN line and optionally the local active controller state.
                 (Constants.GPIB_ATN*)
    :return: return value of the library call.
    :rtype: :class:`pyvisa.constants.StatusCode`
    """
    return library.viGpibControlATN(session, mode)