[systemd-devel] Testing if timesyncd is synced

[Mantas Mikulėnas]

On Wed, Feb 20, 2019 at 10:55 AM Paul D. DeRocco <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
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