/* Determine the class of this session, i.e. one of "user", "greeter" or "lock-screen". */
int sd_session_get_class(const char *session, char **class);
+/* Determine the X11 display of this session. */
+int sd_session_get_display(const char *session, char **display);
+
/* Return active session and user of seat */
int sd_seat_get_active(const char *seat, char **session, uid_t *uid);