* Instead of returning an empty string array or empty uid array, we
* may return NULL.
*
- * Free the data we return with libc free().
+ * Free the data the library returns with libc free(). String arrays
+ * are NULL terminated and you need to free the array itself in
+ * addition to the strings contained.
*
* We return error codes as negative errno, kernel-style. 0 or
* positive on success.
* These functions access data in /proc, /sys/fs/cgroup and /run. All
* of these are virtual file systems, hence the accesses are
* relatively cheap.
+ *
+ * See sd-login(3) for more information.
*/
/* Get session from PID. Note that 'shared' processes of a user are
* error for non-service processes. */
int sd_pid_get_unit(pid_t, char **unit);
-/* Get state from uid. Possible states: offline, lingering, online, active */
+/* Get state from uid. Possible states: offline, lingering, online, active, closing */
int sd_uid_get_state(uid_t uid, char**state);
/* Return 1 if uid has session on seat. If require_active is true will
* just return number of seats.*/
int sd_uid_get_seats(uid_t uid, int require_active, char ***seats);
-/* Return 1 if the session is a active */
+/* Return 1 if the session is a active. */
int sd_session_is_active(const char *session);
+/* Get state from session. Possible states: online, active, closing
+ * (This function is a more generic version of
+ * sd_session_is_active().) */
+int sd_session_get_state(const char *sessio, char **state);
+
/* Determine user id of session */
int sd_session_get_uid(const char *session, uid_t *uid);
/* Determine the X11 display of this session. */
int sd_session_get_display(const char *session, char **display);
+/* Determine the TTY of this session. */
+int sd_session_get_tty(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);
/* Return whether the seat is multi-session capable */
int sd_seat_can_multi_session(const char *seat);
+/* Return whether the seat is TTY capable, i.e. suitable for showing console UIs */
+int sd_seat_can_tty(const char *seat);
+
+/* Return whether the seat is graphics capable, i.e. suitable for showing graphical UIs */
+int sd_seat_can_graphical(const char *seat);
+
/* Get all seats, store in *seats. Returns the number of seats. If
* seats is NULL only returns number of seats. */
int sd_get_seats(char ***seats);