[Libguestfs] Redirecting libguestfs error messages

Hi, When I register a callback for events with this function call: eh = guestfs_set_event_callback(g, message_callback, GUESTFS_EVENT_ALL, 0, dev); Shouldnt it capture and redirect messages like this to message_callback(): "libguestfs: error: lstat: /.Trash: No such file or directory" I still get them in stderr .. Thanks, Or