+/**
+ * struct timemono - a monotonic time.
+ * @ts: the actual timespec value.
+ *
+ * This comes from the monotonic clock (if available), so it's useful
+ * for measuring intervals as it won't change even if the system clock
+ * is moved for some reason.
+ */
+struct timemono {
+ struct timespec ts;
+};
+
+/**
+ * TIME_HAVE_MONOTONIC - defined if we really have a monotonic clock.
+ *
+ * Otherwise time_mono() just refers to time_now(). Your code might
+ * test this if you really need a monotonic clock.
+ */
+#if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
+#define TIME_HAVE_MONOTONIC 1
+#endif
+