2 files changed, 18 insertions, 0 deletions
diff --git a/conf/conf.c b/conf/conf.c
index 11c136e7..4e31de29 100644
--- a/conf/conf.c
+++ b/conf/conf.c
@@ -201,6 +201,23 @@ config_free(struct config *c)
     rfree(c->pool);
 }
 
+/**
+ * config_free_old - free stored old configuration
+ *
+ * This function frees the old configuration (%old_config) that is saved for the
+ * purpose of undo. It is useful before parsing a new config when reconfig is
+ * requested, to avoid keeping three (perhaps memory-heavy) configs together.
+ */
+void
+config_free_old(void)
+{
+  tm_stop(config_timer);
+  undo_available = 0;
+
+  config_free(old_config);
+  old_config = NULL;
+}
+
 void
 config_add_obstacle(struct config *c)
 {
diff --git a/conf/conf.h b/conf/conf.h
index 5ec924b0..b409750e 100644
--- a/conf/conf.h
+++ b/conf/conf.h
@@ -70,6 +70,7 @@ struct config *config_alloc(const char *name);
 int config_parse(struct config *);
 int cli_parse(struct config *);
 void config_free(struct config *);
+void config_free_old(void);
 int config_commit(struct config *, int type, uint timeout);
 int config_confirm(void);
 int config_undo(void);