Hal Murray via devel <devel@ntpsec.org>: > > I've got a box sending bogus time, but the system seems to be running happily. > > I assume there is some GPS rollover fixup code someplace, but I can't find > it. Anybody know where it is? > > > There are two likely places. On is in the HP driver itself, > ntpd/refclock_hpgps.c > The other is in ntpd/ntp_refclock.c where it might fixup many drivers > > I can't find "week", ""roll", or 1024 in either file.
I am certain the generic refclock code is not doing anything explicit to compensate for GPS rollover. For one, I just re-skimmed it to check. For another, if that were possible there wouldn't be ad-hoc rollover code scattered through multiple drivers. Looking at the hpgps driver...I don't see any rollover handling there, either. The only other possibility I can see is that the core sync algorithms simply ignore any date that isn't plausibly within a certain delta of the system clock date, using only its low-order bits and assuming the the ae is correct. This should actually be a decent heuristic except near midnight. But I'm not sure how to check whether this is happening. -- <a href="http://www.catb.org/~esr/">Eric S. Raymond</a> Please consider contributing to my Patreon page at https://www.patreon.com/esr so I can keep the invisible wheels of the Internet turning. Give generously - the civilization you save might be your own. _______________________________________________ devel mailing list devel@ntpsec.org http://lists.ntpsec.org/mailman/listinfo/devel