int DB_MPOOLFILE->set_ftype(DB_MPOOLFILE *mpf, int ftype);
The DB_MPOOLFILE->set_ftype method specifies a file type for the purposes of input or output processing of the files pages as they are read from or written to, the backing filesystem store. The ftype argument must be the same as a ftype argument previously specified to the DB_ENV->memp_register method. (See the DB_ENV->memp_register documentation for more information.)
The DB_MPOOLFILE->set_ftype method configures a file in the memory pool, not only operations performed using the specified DB_MPOOLFILE handle.
The DB_MPOOLFILE->set_ftype interface may not be called after the DB_MPOOLFILE->open interface is called. If the file is already open in the memory pool when DB_MPOOLFILE->open is called, the information specified to DB_MPOOLFILE->set_ftype will replace the existing information.
The DB_MPOOLFILE->set_ftype method returns a non-zero error value on failure and 0 on success.
The DB_MPOOLFILE->set_ftype method may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions. If a catastrophic error has occurred, the DB_MPOOLFILE->set_ftype method may fail and return DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.
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