ipmgmt_db_update_if
err = ipmgmt_db_walk(ipmgmt_db_update_if, &cb, IPADM_DB_WRITE);
err = ipmgmt_db_walk(ipmgmt_db_update_if, &cb, IPADM_DB_WRITE);
extern db_wfunc_t ipmgmt_db_add, ipmgmt_db_update, ipmgmt_db_update_if;