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Step system time in RTC preinit only with offsets over 1 second

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This commit is contained in:
Miroslav Lichvar
2012-02-14 17:49:55 +01:00
parent 2be89bc6f2
commit 91c9f84a01
1 changed files with 13 additions and 6 deletions
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19
rtc_linux.c
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@@ -935,7 +935,7 @@ RTC_Linux_TimePreInit(void)
time_t rtc_t, estimated_correct_rtc_t;
long interval;
double accumulated_error = 0.0;
struct timeval new_sys_time;
struct timeval new_sys_time, old_sys_time;
coefs_file_name = CNF_GetRtcFile();
@@ -970,8 +970,6 @@ RTC_Linux_TimePreInit(void)
accumulated_error = file_ref_offset + (double)(interval) * 1.0e-6 * file_rate_ppm;
/* Correct time */
LOG(LOGS_INFO, LOGF_RtcLinux, "Set system time, error in RTC = %f",
accumulated_error);
estimated_correct_rtc_t = rtc_t - (long)(0.5 + accumulated_error);
} else {
estimated_correct_rtc_t = rtc_t - (long)(0.5 + accumulated_error);
@@ -980,9 +978,18 @@ RTC_Linux_TimePreInit(void)
new_sys_time.tv_sec = estimated_correct_rtc_t;
new_sys_time.tv_usec = 0;
/* Tough luck if this fails */
if (settimeofday(&new_sys_time, NULL) < 0) {
LOG(LOGS_WARN, LOGF_RtcLinux, "Could not settimeofday");
/* Set system time only if the step is larger than 1 second */
if (!(gettimeofday(&old_sys_time, NULL) < 0) &&
(old_sys_time.tv_sec - new_sys_time.tv_sec > 1 ||
old_sys_time.tv_sec - new_sys_time.tv_sec < -1)) {
LOG(LOGS_INFO, LOGF_RtcLinux, "Set system time, error in RTC = %f",
accumulated_error);
/* Tough luck if this fails */
if (settimeofday(&new_sys_time, NULL) < 0) {
LOG(LOGS_WARN, LOGF_RtcLinux, "Could not settimeofday");
}
}
} else {
LOG(LOGS_WARN, LOGF_RtcLinux, "Could not convert RTC reading to seconds since 1/1/1970");