#include <db.h>

int
DB_ENV->get_shm_key(DB_ENV *dbenv, long *shm_keyp);  

The DB_ENV->get_shm_key() method returns the base segment ID. This is used for Berkeley DB environment shared memory regions created in system memory on VxWorks or systems supporting X/Open-style shared memory interfaces. It may be specified using the DB_ENV->set_shm_key() method.

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

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