return nsGetServiceByCID(kIOServiceCID, 0, error);
return nsGetServiceByCIDWithError(kIOServiceCID, error);
do_GetIOService(nsresult* error = 0){    static NS_DEFINE_CID(kIOServiceCID, NS_IOSERVICE_CID);    return nsGetServiceByCID(kIOServiceCID, 0, error);}