linux-kernel - Re: [ntpwg] Bug: Status/Summary of slashdot leap-second crash on new years 2008-2009

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Message-ID: <49647E0F.9030008@davidnewall.com>
Date:	Wed, 07 Jan 2009 20:33:59 +1030
From:	David Newall <davidn@...idnewall.com>
To:	linasvepstas@...il.com
CC:	mayer@....isc.org, david@...g.hm,
	Robert Hancock <hancockr@...w.ca>,
	Ben Goodger <goodgerster@...il.com>,
	Kyle Moffett <kyle@...fetthome.net>,
	MentalMooMan <slashdot@...eshallam.info>,
	linux-kernel@...r.kernel.org, ntpwg@...ts.ntp.isc.org,
	Travis Crump <pretzalz@...hhouse.org>,
	burdell@...ntheinter.net, Nick Andrew <nick@...k-andrew.net>,
	"Jeffrey J. Kosowsky" <jeff@...owsky.org>
Subject: Re: [ntpwg] Bug: Status/Summary of slashdot leap-second crash on
 new years 2008-2009

Linas Vepstas wrote:
> Currently, the Linux kernel keeps time in UTC. This means
> that it must take special actions to tick twice when a leap
> second comes by.

Except it doesn't have to tick twice.  Refer to
http://lkml.org/lkml/2009/1/7/78 in which I show that a time_t (what
time() returns) counts leap seconds (According to Bernstein this is what
UTC means), and using zoneinfo, the library processes leap seconds
correctly.

I just realised that the Notes in man 2 time are confusing and probably
unnecessary.  Suffice to say that (assuming correctly configured
zoneinfo) time() returns the number of seconds elapsed since start 1970.
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