update mc interface

mc/mc.h

@@ -40,7 +40,11 @@ struct mod
   int (*mod_signal)(struct mod* v);
   int (*mod_end)(struct mod* v);
   int (*mod_set_param)(struct mod* v, char* name, char* value);
-  long mod_dumby[100 - 6]; /* align, 100 minus the number of mod
+  int (*mod_session_change)(struct mod* v, int, int);
+  int (*mod_get_wait_objs)(struct mod* v, tbus* read_objs, int* rcount,
+                           tbus* write_objs, int* wcount, int* timeout);
+  int (*mod_check_wait_objs)(struct mod* v);
+  long mod_dumby[100 - 9]; /* align, 100 minus the number of mod
                               functions above */
   /* server functions */
   int (*server_begin_update)(struct mod* v);