1 files changed, 11 insertions, 0 deletions

diff --git a/src/include/gnunet_time_lib.h b/src/include/gnunet_time_lib.h
index fa443a463..b9c2d92f0 100644
--- a/src/include/gnunet_time_lib.h
+++ b/src/include/gnunet_time_lib.h
@@ -353,6 +353,17 @@ struct GNUNET_TIME_Relative GNUNET_TIME_relative_add (struct
                                                       GNUNET_TIME_Relative
                                                       a2);
 
+/**
+ * Subtract relative timestamp from the other.
+ *
+ * @param a1 first timestamp
+ * @param a2 second timestamp
+ * @return ZERO if a2>=a1 (including both FOREVER), FOREVER if a1 is FOREVER, a1-a2 otherwise
+ */
+struct GNUNET_TIME_Relative
+GNUNET_TIME_relative_subtract (struct GNUNET_TIME_Relative a1,
+                               struct GNUNET_TIME_Relative a2);
+
 
 /**
  * Convert relative time to network byte order.