rtc: improve accuracy of preinit step

diff --git a/rtc_linux.c b/rtc_linux.c
index c0c8a69ee81a04cbec4f6b2ff1020e499260a1f2..64d41992e9fdbe23a4eccd44e213000dfa68a912 100644 (file)
--- a/rtc_linux.c
+++ b/rtc_linux.c
@@ -1027,8 +1027,12 @@ RTC_Linux_TimePreInit(void)
       }
 
       /* Correct time */
-      new_sys_time.tv_sec = rtc_t - (time_t)(0.5 + accumulated_error);
-      new_sys_time.tv_usec = 0;
+
+      new_sys_time.tv_sec = rtc_t;
+      /* Average error in the RTC reading */
+      new_sys_time.tv_usec = 500000;
+
+      UTI_AddDoubleToTimeval(&new_sys_time, -accumulated_error, &new_sys_time);
 
       /* Set system time only if the step is larger than 1 second */
       if (!(gettimeofday(&old_sys_time, NULL) < 0) &&