sd-login: beef up login api, to add monitoring and enumerating

1 files changed, 64 insertions, 5 deletions

diff --git a/src/sd-login.h b/src/sd-login.h
index f23ac80526..c6835e1235 100644
--- a/src/sd-login.h
+++ b/src/sd-login.h
@@ -24,17 +24,48 @@
 
 #include <sys/types.h>
 
-/* Get session from PID */
+/*
+ * A few points:
+ *
+ * Instead of returning an empty string array or empty uid array, we
+ * may return NULL.
+ *
+ * Free the data we return with libc free().
+ *
+ * We return error codes as negative errno, kernel-style.
+ *
+ * These functions access data in /proc, /sys/fs/cgroup and /run. All
+ * of these are virtual file systems, hence the accesses are
+ * relatively cheap.
+ */
+
+/* Get session from PID. Note that 'shared' processes of a user are
+ * not attached to a session, but only attached to a user. This will
+ * return an error for system processes and 'shared' processes of a
+ * user. */
 int sd_pid_get_session(pid_t pid, char **session);
 
+/* Get UID of the owner of the session of the PID (or in case the
+ * process is a 'shared' user process the UID of that user is
+ * returned). This will not return the UID of the process, but rather
+ * the UID of the owner of the cgroup the process is in. This will
+ * return an error for system processes. */
+int sd_pid_get_owner_uid(pid_t pid, uid_t *uid);
+
 /* Get state from uid. Possible states: offline, lingering, online, active */
 int sd_uid_get_state(uid_t uid, char**state);
 
-/* Return 1 if uid has session on seat */
-int sd_uid_is_on_seat(uid_t uid, const char *seat);
+/* Return 1 if uid has session on seat. If require_active is true will
+ * look for active sessions only. */
+int sd_uid_is_on_seat(uid_t uid, int require_active, const char *seat);
+
+/* Return sessions of user. If require_active is true will look
+ * for active sessions only. */
+int sd_uid_get_sessions(uid_t uid, int require_active, char ***sessions);
 
-/* Return 1 if uid has active session on seat */
-int sd_uid_is_active_on_seat(uid_t uid, const char *seat);
+/* Return seats of user is on. If require_active is true will look for
+ * active seats only.  */
+int sd_uid_get_seats(uid_t uid, int require_active, char ***seats);
 
 /* Return 1 if the session is a active */
 int sd_session_is_active(const char *session);
@@ -48,4 +79,32 @@ int sd_session_get_seat(const char *session, char **seat);
 /* Return active session and user of seat */
 int sd_seat_get_active(const char *seat, char **session, uid_t *uid);
 
+/* Return sessions and users on seat */
+int sd_seat_get_sessions(const char *seat, char ***sessions, uid_t **uid, unsigned *n_uids);
+
+/* Get all seats */
+int sd_get_seats(char ***seats);
+
+/* Get all sessions */
+int sd_get_sessions(char ***sessions);
+
+/* Get all logged in users */
+int sd_get_uids(uid_t **users);
+
+/* Monitor object */
+typedef struct sd_login_monitor sd_login_monitor;
+
+/* Create a new monitor. Category must be NULL, "seat", "session",
+ * "uid" to get monitor events for the specific category (or all). */
+int sd_login_monitor_new(const char *category, sd_login_monitor** ret);
+
+/* Destroys the passed monitor. Returns NULL. */
+sd_login_monitor* sd_login_monitor_unref(sd_login_monitor *m);
+
+/* Flushes the monitor */
+int sd_login_monitor_flush(sd_login_monitor *m);
+
+/* Get FD from monitor */
+int sd_login_monitor_get_fd(sd_login_monitor *m);
+
 #endif