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time-util: improve detection of synchronized clock

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Instead of checking for the STA_UNSYNC flag in the timex status, check
the maximum error. It is updated by the kernel, increasing at a rate of
500 ppm. The maximum value is 16 seconds, which triggers the STA_UNSYNC
flag.

This follows timedatex and allows timedated to correctly detect a clock
synchronized by chronyd when configured to not synchronize the RTC.
This commit is contained in:
Miroslav Lichvar 2019-08-01 11:47:18 +02:00 committed by Zbigniew Jędrzejewski-Szmek
parent 1888e5bec6
commit bca5a0eacc
1 changed files with 4 additions and 1 deletions
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5
src/basic/time-util.c
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@ -1191,7 +1191,10 @@ bool ntp_synced(void) {
if (adjtimex(&txc) < 0)
return false;
if (txc.status & STA_UNSYNC)
/* Consider the system clock synchronized if the reported maximum error is smaller than the maximum
* value (16 seconds). Ignore the STA_UNSYNC flag as it may have been set to prevent the kernel from
* touching the RTC. */
if (txc.maxerror >= 16000000)
return false;
return true;