From owner-freebsd-current@FreeBSD.ORG Mon Jan 2 21:37:31 2006 Return-Path: X-Original-To: current@freebsd.org Delivered-To: freebsd-current@FreeBSD.ORG Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id EA99916A41F for ; Mon, 2 Jan 2006 21:37:31 +0000 (GMT) (envelope-from phk@critter.freebsd.dk) Received: from phk.freebsd.dk (phk.freebsd.dk [130.225.244.222]) by mx1.FreeBSD.org (Postfix) with ESMTP id 2691A43D69 for ; Mon, 2 Jan 2006 21:37:26 +0000 (GMT) (envelope-from phk@critter.freebsd.dk) Received: from critter.freebsd.dk (unknown [192.168.48.2]) by phk.freebsd.dk (Postfix) with ESMTP id 57F39BC50; Mon, 2 Jan 2006 21:37:21 +0000 (UTC) To: Matthias Andree From: "Poul-Henning Kamp" In-Reply-To: Your message of "Mon, 02 Jan 2006 22:19:56 +0100." <20060102211956.GA10928@merlin.emma.line.org> Date: Mon, 02 Jan 2006 22:37:20 +0100 Message-ID: <80684.1136237840@critter.freebsd.dk> Sender: phk@critter.freebsd.dk Cc: current@freebsd.org Subject: Re: FreeBSD handles leapsecond correctly X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 02 Jan 2006 21:37:32 -0000 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.