long mpiFilterConfigSet(MPIFilter       filter,
                        MPIFilterConfig *config,
                        void            *external)

FilterConfigSet sets a Filter's (filter) configuration using data from the structure pointed to by config, and from the implementation-specific structure pointed to by external (if external is not NULL).

The Filter's configuration information in external is in addition to the Filter's configuration information in config, i.e, the Filter's configuration information in config and in external is not the same information. Note that config or external can be NULL (but not both NULL).

external either points to a structure of type MEIFilterConfig{} or is NULL.