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time-util: improve detection of synchronized clock
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.
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@ -1191,7 +1191,10 @@ bool ntp_synced(void) {
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if (adjtimex(&txc) < 0)
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return false;
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if (txc.status & STA_UNSYNC)
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/* Consider the system clock synchronized if the reported maximum error is smaller than the maximum
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* value (16 seconds). Ignore the STA_UNSYNC flag as it may have been set to prevent the kernel from
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* touching the RTC. */
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if (txc.maxerror >= 16000000)
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return false;
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return true;
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