Add D-Bus method to get the duration since an update completed.
This new API can be used by Chrome to automatically reboot the device
at N hours after updating. This is implemented as a D-Bus method that
returns the number of micro-seconds on the wall-clock since the update
completed. If the device has not updated, the D-Bus method returns an
error.
For robustness, durations are measured using the CLOCK_BOOTTIME clock
instead of the usual CLOCK_REALTIME clock. This avoids interference
with NTP adjustments, the RTC clock being wrong and other things.
BUG=chromium:218192
TEST=New unit test + unit tests pass + manual test on a device using
the gdbus(1) command as the chronos user.
Change-Id: I51d44d69afe2d3024bb0780916c3c4e3f8ebb19e
Reviewed-on: https://chromium-review.googlesource.com/173032
Reviewed-by: David Zeuthen <[email protected]>
Commit-Queue: David Zeuthen <[email protected]>
Tested-by: David Zeuthen <[email protected]>
diff --git a/clock_interface.h b/clock_interface.h
index c2b1a04..d9e6124 100644
--- a/clock_interface.h
+++ b/clock_interface.h
@@ -27,6 +27,13 @@
// (This is a simple wrapper around clock_gettime(2) / CLOCK_MONOTONIC_RAW.)
virtual base::Time GetMonotonicTime() = 0;
+ // Returns monotonic time since some unspecified starting point. It
+ // is increased when the system is sleeping but it's not affected
+ // by NTP or the user changing the time.
+ //
+ // (This is a simple wrapper around clock_gettime(2) / CLOCK_BOOTTIME.)
+ virtual base::Time GetBootTime() = 0;
+
virtual ~ClockInterface() {}
};
