+int uc_check_timeout (void)
+{
+ time_t now;
+ cache_entry_t *ce;
+
+ char **keys = NULL;
+ int keys_len = 0;
+
+ char *key;
+ c_avl_iterator_t *iter;
+ int i;
+
+ pthread_mutex_lock (&cache_lock);
+
+ now = time (NULL);
+
+ /* Build a list of entries to be flushed */
+ iter = c_avl_get_iterator (cache_tree);
+ while (c_avl_iterator_next (iter, (void *) &key, (void *) &ce) == 0)
+ {
+ /* If entry has not been updated, add to `keys' array */
+ if ((now - ce->last_update) >= (2 * ce->interval))
+ {
+ char **tmp;
+
+ tmp = (char **) realloc ((void *) keys,
+ (keys_len + 1) * sizeof (char *));
+ if (tmp == NULL)
+ {
+ ERROR ("uc_purge: realloc failed.");
+ c_avl_iterator_destroy (iter);
+ return (-1);
+ }
+
+ keys = tmp;
+ keys[keys_len] = strdup (key);
+ if (keys[keys_len] == NULL)
+ {
+ ERROR ("uc_check_timeout: strdup failed.");
+ continue;
+ }
+ keys_len++;
+ }
+ } /* while (c_avl_iterator_next) */
+
+ for (i = 0; i < keys_len; i++)
+ {
+ int status;
+
+ status = ut_check_interesting (keys[i]);
+
+ if (status < 0)
+ {
+ ERROR ("uc_check_timeout: ut_check_interesting failed.");
+ sfree (keys[i]);
+ }
+ else if (status == 0) /* ``service'' is uninteresting */
+ {
+ ce = NULL;
+ DEBUG ("uc_check_timeout: %s is missing but ``uninteresting''", keys[i]);
+ status = c_avl_remove (cache_tree, keys[i], (void *) &key, (void *) &ce);
+ if (status != 0)
+ {
+ ERROR ("uc_check_timeout: c_avl_remove (%s) failed.", keys[i]);
+ }
+ sfree (keys[i]);
+ sfree (ce);
+ }
+ else /* (status > 0); ``service'' is interesting */
+ {
+ /*
+ * `keys[i]' is not freed and set to NULL, so that the for-loop below
+ * will send out notifications. There's nothing else to do here.
+ */
+ DEBUG ("uc_check_timeout: %s is missing and ``interesting''", keys[i]);
+ ce->state = STATE_ERROR;
+ }
+ } /* for (keys[i]) */
+
+ c_avl_iterator_destroy (iter);
+
+ pthread_mutex_unlock (&cache_lock);
+
+ for (i = 0; i < keys_len; i++)
+ {
+ if (keys[i] == NULL)
+ continue;
+
+ uc_send_notification (keys[i]);
+ sfree (keys[i]);
+ }
+
+ sfree (keys);
+
+ return (0);
+} /* int uc_check_timeout */
+