+extern void guestfs_set_close_callback (guestfs_h *g, guestfs_close_cb cb, void *opaque);
+extern void guestfs_set_progress_callback (guestfs_h *g, guestfs_progress_cb cb, void *opaque);
+
+/*--- Private data area ---*/
+extern void guestfs_set_private (guestfs_h *g, const char *key, void *data);
+extern void *guestfs_get_private (guestfs_h *g, const char *key);