-// UNNEEDED dual_timestamp* dual_timestamp_from_monotonic(dual_timestamp *ts, usec_t u);
-// UNNEEDED dual_timestamp* dual_timestamp_from_boottime_or_monotonic(dual_timestamp *ts, usec_t u);
+#if 0 /// UNNEEDED by elogind
+dual_timestamp* dual_timestamp_from_monotonic(dual_timestamp *ts, usec_t u);
+dual_timestamp* dual_timestamp_from_boottime_or_monotonic(dual_timestamp *ts, usec_t u);
+#endif // 0
+
+triple_timestamp* triple_timestamp_get(triple_timestamp *ts);
+triple_timestamp* triple_timestamp_from_realtime(triple_timestamp *ts, usec_t u);
+
+#define DUAL_TIMESTAMP_HAS_CLOCK(clock) \
+ IN_SET(clock, CLOCK_REALTIME, CLOCK_REALTIME_ALARM, CLOCK_MONOTONIC)
+
+#define TRIPLE_TIMESTAMP_HAS_CLOCK(clock) \
+ IN_SET(clock, CLOCK_REALTIME, CLOCK_REALTIME_ALARM, CLOCK_MONOTONIC, CLOCK_BOOTTIME, CLOCK_BOOTTIME_ALARM)