>I'm not sure this means more code duplication: If the semantic you propose is
>fully implemented, it would mean the generic error handler would never
>print the sense if there is a device-specific error handler, thus you
>would have to print the sense in each specific error handler ...

It just means that a device specific handler has to handle things
fully if it wants to control (i.e., by not returning -1) the
returned to generic handler.