DB_EXCL
if ((ret = __db_open(real_name, flags | DB_EXCL,
OKFLAGS | DB_EXCL, mode, &fd)) != 0)
LF_SET(DB_CREATE | DB_EXCL);
LF_SET(DB_EXCL);
LF_CLR(DB_CREATE | DB_EXCL);
DB_APP_TMP, NULL, NULL, DB_CREATE | DB_EXCL | DB_TEMPORARY,
if (arg_flags & DB_EXCL)