Forgive me if I am wrong, but this is a very odd request. As far as I can tell, the request is for the NTP corrections to the system clock to be used to correct a different clock.
I cannot quite understand how this is of practical use. It is like diagnosing the faults on your car engine and then applying the corrections to a train engine. regards pk -----Original Message----- From: questions-bounces+p.kennedy=fugro.com...@lists.ntp.org [mailto:questions-bounces+p.kennedy=fugro.com...@lists.ntp.org] On Behalf Of Rob Sent: Wednesday, 17 October 2012 3:06 PM To: questions@lists.ntp.org Subject: Re: [ntp:questions] Using ntpd with custom clock Chuck Swiger <cswi...@mac.com> wrote: > Hi-- > > On Oct 16, 2012, at 2:49 PM, Felipe Blauth wrote: >> 2012/10/16 Brian Utterback <brian.utterb...@oracle.com> >>> I think the original poster is asking to do something a little bit different than the usual. If I am reading it right, he is not asking how to get ntpd to read a custom clock as a source of time (which as noted is what a refclock is for). I think he is asking how to get ntpd to *set* a custom clock, treating it as it would the system clock, so as to sync the custom clock with the upstream NTP server time. >> >> That's exactly what I want to do. > > OK. You can either hook into ntpd's calls to get/settimeofday() and adjtime() as you initially suggested, or perhaps look into the SHM driver. The latter is a generic interface that puts clock timestamps into shared memory; but you can read from SHM instead of writing, if you like-- would be easier if you have something like a GPS receiver and gpsd populating the SHM timestamps. Funny that, after you initially seem to indicate that you have understood the question, you still come up with the SHM driver that is a REFERENCE CLOCK driver, not an ADJUSTMENT CLOCK driver. _______________________________________________ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions _______________________________________________ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
