Date: Mon, 02 Jan 2006 22:37:20 +0100 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: Matthias Andree <matthias.andree@gmx.de> Cc: current@freebsd.org Subject: Re: FreeBSD handles leapsecond correctly Message-ID: <80684.1136237840@critter.freebsd.dk> In-Reply-To: Your message of "Mon, 02 Jan 2006 22:19:56 %2B0100." <20060102211956.GA10928@merlin.emma.line.org>
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In message <20060102211956.GA10928@merlin.emma.line.org>, Matthias Andree writes: >On Mon, 02 Jan 2006, Poul-Henning Kamp wrote: >No offense, but I simply don't get your point. Right, I'm getting that feeling here too. I think the only way for you to catch up is to study the subject matter much more carefully. In particular you need to understand the "ownership" of the various time/frequency related units, standards and timescales much better than you do now. A good place to start is the classic 1968 Essen article in Metrologica: http://www.leapsecond.com/history/1968-Metrologia-v4-n4-Essen.pdf And next read Steve Allens very comprehensive but rather politically slanted web-page about the leap-second problem: http://www.ucolick.org/~sla/leapsecs/dutc.html Next you want to read RFC1305 to understand how NTP works, pay particular attention to the timescale/representation parts. Finally, you may want to buy and explore "Calendrical Calculations" http://emr.cs.uiuc.edu/home/reingold/calendar-book/index.shtml And then, feel free come back and tell me and the rest of the world how easy this problem can be solved correctly. >Another question: Did you >mean to write "FreeBSD handles leapsecond in POSIX compliance" for the >subject? POSIX compliance is assumed for FreeBSD and no other relevant computer standardization exists for this area. I assumed this to be self-evident, but I guess I need to lower the bar in future emails. Poul-Henning -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.
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