hibernation: Rescan the event list on state change

When we change the hibernation state, rescan the main loop event list because
the new state might affect the events.

Signed-off-by: David Goulet <dgoulet@torproject.org>

src/or/hibernate.c

@@ -1111,10 +1111,18 @@ getinfo_helper_accounting(control_connection_t *conn,
 static void
 on_hibernate_state_change(hibernate_state_t prev_state)
 {
-  (void)prev_state; /* Should we do something with this? */
   control_event_server_status(LOG_NOTICE,
                               "HIBERNATION_STATUS STATUS=%s",
                               hibernate_state_to_string(hibernate_state));
+
+  /* We are changing hibernation state, this can affect the main loop event
+   * list. Rescan it to update the events state. We do this whatever the new
+   * hibernation state because they can each possibly affect an event. The
+   * initial state means we are booting up so we shouldn't scan here because
+   * at this point the events in the list haven't been initialized. */
+  if (prev_state != HIBERNATE_STATE_INITIAL) {
+    rescan_periodic_events(get_options());
+  }
 }
 
 #ifdef TOR_UNIT_TESTS

src/or/main.c

@@ -150,7 +150,6 @@ static int run_main_loop_until_done(void);
 static void process_signal(int sig);
 static void shutdown_did_not_work_callback(evutil_socket_t fd, short event,
                                            void *arg) ATTR_NORETURN;
-static void rescan_periodic_events(const or_options_t *options);
 
 /********* START VARIABLES **********/
 
@@ -1549,7 +1548,7 @@ teardown_periodic_events(void)
 
 /** Do a pass at all our periodic events, disable those we don't need anymore
  * and enable those we need now using the given options. */
-static void
+void
 rescan_periodic_events(const or_options_t *options)
 {
   tor_assert(options);

src/or/main.h

@@ -62,6 +62,7 @@ void reset_all_main_loop_timers(void);
 void reschedule_descriptor_update_check(void);
 void reschedule_directory_downloads(void);
 void mainloop_schedule_postloop_cleanup(void);
+void rescan_periodic_events(const or_options_t *options);
 
 MOCK_DECL(long,get_uptime,(void));
 MOCK_DECL(void,reset_uptime,(void));