__bt_open
return (__bt_open(fname, -1, flags & USE_OPEN_FLAGS,
dbp = __bt_open(openinfo->bfname, -1,
dbp = __bt_open(NULL, -1, O_RDWR, S_IRUSR | S_IWUSR, NULL, dflags);
DB *__bt_open(const char *, int, int, int, const BTREEINFO *, int);