#include <db.h>

int
DB_MPOOLFILE->get_clear_len(DB_MPOOLFILE *mpf, u_int32_t *lenp);  

The DB_MPOOLFILE->get_clear_len() method returns the bytes to be cleared.

The DB_MPOOLFILE->get_clear_len() method may be called at any time during the life of the application.

The DB_MPOOLFILE->get_clear_len() method returns a non-zero error value on failure and 0 on success.