namedb_open
struct namedb *namedb_open(struct nsd_options* opt);
nsd->db = namedb_open(nsd->options);
nsd.db = db = namedb_open(opt);
if ((nsd->db = namedb_open(nsd->options)) == NULL) {
xfrd->nsd->db = namedb_open(xfrd->nsd->options);