TAI with Xntpd?

TAI with Xntpd?

Post by Matthew G Newcom » Wed, 28 Apr 1999 04:00:00



G'day,
    Is there anyway to get xntpd to use TAI?  Atomic time, no leap
seconds, etc etc...

Matt

                                *In the future*
Chickens will run on gasoline and many of them will get surprisingly good
gas milage - George Carlin

 
 
 

TAI with Xntpd?

Post by Terje Mathise » Wed, 28 Apr 1999 04:00:00



> G'day,
>     Is there anyway to get xntpd to use TAI?  Atomic time, no leap
> seconds, etc etc...

Sure, you'll just have to hack your own refclock driver, retrieving the
TAI-UTC offset from the gps board, and either add this offset, or just
use TAI time tirectly, if you can persuade your GPS to give it to you.

I'd guess the Oncore would be happy to do so.

(Actually, what you'll get from a GPS would probably be GPS time, which
is at a constant offset from TAI, i.e. it will not increase/decrease
after the next leap second.)

Terje

--

Using self-discipline, see http://www.eiffel.com/discipline
"almost all programming can be viewed as an exercise in caching"

 
 
 

TAI with Xntpd?

Post by D. J. Bernste » Thu, 29 Apr 1999 04:00:00



Quote:> Is there anyway to get xntpd to use TAI?

My SNTP client uses NTP results and a local leap-second table to set the
UNIX clock to TAI, with the same epoch as the Olson time-zone library:

   http://pobox.com/~djb/clockspeed.html

I'm maintaining leap-second tables in

   http://pobox.com/~djb/libtai/leapsecs.txt (readable source)
   http://pobox.com/~djb/libtai/leapsecs.dat (works with clockspeed)

and also through DNS; try ``nslookup -type=txt leap.yp.to''.

---Dan

 
 
 

1. xntpd question: running xntpd in client mode

hi,

i'm running ntpdate from the crontab because of the security risks of
running xntpd and i was wandering if it is possible to configure xntpd
to run in client mode (no open ports).

any help is apreciated since i almost drawned in the documentation and
wans't able to find what i wanted.

cheers,


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