Do not fallthrough here
@@ -1534,6 +1534,7 @@ static int swow_stdiop_fs_set_option(php_stream *stream, int option, int value,
case PHP_STREAM_SYNC_FDSYNC:
return swow_stdiop_fs_sync(stream, 1) == 0 ? PHP_STREAM_OPTION_RETURN_OK : PHP_STREAM_OPTION_RETURN_ERR;
}
+ return PHP_STREAM_OPTION_RETURN_NOTIMPL;
#endif
case PHP_STREAM_OPTION_TRUNCATE_API:
