The memp_fclose function closes the source file indicated by the
DB_MPOOLFILE structure. Calling memp_fclose does not imply
a call to memp_fsync, i.e. no pages are written to the source
file as as a result of calling memp_fclose.
In addition, if the file argument to memp_fopen was NULL,
any underlying files created for this DB_MPOOLFILE will be removed.
Once memp_fclose has been called, regardless of its return, the
DB_MPOOLFILE handle may not be accessed again.
The memp_fclose function returns a non-zero error value on failure and 0 on success.
Errors
The memp_fclose function 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 memp_fclose function may fail and return
DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail
in the same way.