Mark, Details on how leapseconds are handled are in the NTP leapseconds executive summary on the NTP Project Page linked from www.ntp.org. The return code from ntp-gettime() reveals when a leap second is or is not in progress. In the intended model, ctime or equivalant should notice this an map 0 to 60 for the second second. At the end of this second the ASCII seconds number will resume from 0. So far as I know, nobody has ever implemented that.
Dave Mark Newman wrote: > Unruh - thanks for responding. You are the only one > who did. > > I certainly did not mean to disparage NTP time. I > have spec'ed that it be used on our system. Where I > run into problems is when a leap second occurs. > According to everything I've read when NTP signals > the operating system that the second is occurring it > also outputs time. It uses the POSIX standard method > - duplicate a second (or in some cases stretch the > last second). This causes confusion when a time > sample is taken before the leap second and one during > the leap second. The UTC standard (which only > addresses ascii time representations) actually counts > the second 0..60 rather than 0..59. > > At this point I am obligated to use UTC and NTP. > > Tht missing second is causing me to get a lot of heat. > Does anyone know of a way to get NTP to count the > leap second rather than to delete it? Or am I missing > the point. > > > >>I don't want to step on anyones toes but I am getting >>a lot of heat over using a POSIX compliant ntp re > > leap > >>seconds. The 1 second error inserted can cause a lot >>of trouble. > > > Exactly what heat are you getting and what trouble is > it causing you? > Perhaps if you tell us the problem rather than your > solution, we could come > up with a solution. > > > >>I now that the Olsen mod changes most Unix/Linux time >>processing to handle the leap second in a >>theoretically correct manner rather than being POSIX > > > I have no idea what "a theoretically correct manner " > is. The Posix IS a > theoretically correct manner. > > >>compliant. Is there a similar mod for NTP. I am >>hoping that there is a mod that will cause NTP to >>supply theoretical UTC (even if it is not ascci). > > > NTP DOES supply both theoretical and practical UTC. > > I think what you are worried about is that you want > your system to provide > something like TIA-- Atomic time-- which has no leap > seconds. I believe the > Olsen mods have your system clock run on atomic time > and then use the > leapsecond file and the zoneinfo file for your region > to translate that to > your local time. > > You could just set up ntp to add 33 sec to its time, > and you would have > atomic time. > > > > > >> Mark _______________________________________________ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
