[systemd-devel] Testing if timesyncd is synced

[Aurelian Melinte]

On 20/02/2019 4:18 a.m., Mantas Mikulėnas wrote:
> On Wed, Feb 20, 2019 at 10:55 AM Paul D. DeRocco 
> <pderocco at ix.netcom.com <mailto:pderocco at ix.netcom.com>> wrote:
>
>     What's the simplest way to test if systemd-timesyncd is currently
>     synced
>     to the network, from within an embedded application (running with root
>     privileges)? Is there some single dbus transaction that will give
>     me this
>     answer?
>
>
> Call adjtimex(2) and check whether buf.status has STA_UNSYNC (should 
> be unset when clock is synchronized).
>
> The systemd-timedated helper service (org.freedesktop.timedate1) 
> exposes the same flag as the org.freedesktop.timedate1.NTPSynchronized 
> property on /org/freedesktop/timedate1.
>
> (That said, this deliberately won't work if you've configured 
> timesyncd to use "local time" instead of UTC, as timesyncd doesn't 
> want to activate RTC updates in that mode.)
>
> timesyncd itself exposes several properties including the actual 
> received NTPMessage, but I'm not sure if it's as good as an explicit 
> indication. It does emit update signals however.
>
> -- 
> Mantas Mikulėnas


Some (old?) systems do not have adjtimex:

$ adjtimex

-bash: adjtimex: command not found

$ ntpstat

unsynchronised

polling server every 8 s




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