extern void guestfs_set_reply_callback (guestfs_h *g, guestfs_reply_cb cb, void *opaque);
extern void guestfs_set_log_message_callback (guestfs_h *g, guestfs_log_message_cb cb, void *opaque);
extern void guestfs_set_reply_callback (guestfs_h *g, guestfs_reply_cb cb, void *opaque);
extern void guestfs_set_log_message_callback (guestfs_h *g, guestfs_log_message_cb cb, void *opaque);