#include <db.h> int DB_MPOOLFILE->get_ftype(DB_MPOOLFILE *mpf, int *ftypep);
            The DB_MPOOLFILE->get_ftype() method returns the file type. The file
            type is used for the purposes of file processing, and will be the same as is set using
            the DB_ENV->memp_register() method. 
    
         The DB_MPOOLFILE->get_ftype() method may be called at any time during
         the life of the application.
    
         The DB_MPOOLFILE->get_ftype() 
            
                  method returns a non-zero error value on failure and 0 on success.