logind: implement idle hint logic

[elogind.git] / src / util.c

diff --git a/src/util.c b/src/util.c
index 2047ebd7bd841bd8b045c86258327dab81f4fcf4..08529cc235ba3513afc52c85cef1b2ff536d1d00 100644 (file)
--- a/src/util.c
+++ b/src/util.c
@@ -108,6 +108,28 @@ dual_timestamp* dual_timestamp_get(dual_timestamp *ts) {
         return ts;
 }
 
+dual_timestamp* dual_timestamp_from_realtime(dual_timestamp *ts, usec_t u) {
+        int64_t delta;
+        assert(ts);
+
+        ts->realtime = u;
+
+        if (u == 0)
+                ts->monotonic = 0;
+        else {
+                delta = (int64_t) now(CLOCK_REALTIME) - (int64_t) u;
+
+                ts->monotonic = now(CLOCK_MONOTONIC);
+
+                if ((int64_t) ts->monotonic > delta)
+                        ts->monotonic -= delta;
+                else
+                        ts->monotonic = 0;
+        }
+
+        return ts;
+}
+
 usec_t timespec_load(const struct timespec *ts) {
         assert(ts);