-extern void afb_session_init(int max_session_count, int timeout, const char *initok);
-
-extern struct afb_session *afb_session_create (const char *uuid, int timeout);
-extern struct afb_session *afb_session_get (const char *uuid, int *created);
+#define AFB_SESSION_TIMEOUT_INFINITE -1
+#define AFB_SESSION_TIMEOUT_DEFAULT -2
+#define AFB_SESSION_TIMEOUT_IS_VALID(x) ((x) >= AFB_SESSION_TIMEOUT_DEFAULT)
+
+extern int afb_session_init(int max_session_count, int timeout, const char *initok);
+extern void afb_session_purge();
+extern const char *afb_session_initial_token();
+extern void afb_session_foreach(void (*callback)(void *closure, struct afb_session *session), void *closure);
+
+extern struct afb_session *afb_session_create (int timeout);
+extern struct afb_session *afb_session_search (const char *uuid);
+extern struct afb_session *afb_session_get (const char *uuid, int timeout, int *created);