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

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Message-ID: <20090107095419.70b78dc7@lxorguk.ukuu.org.uk>
Date:	Wed, 7 Jan 2009 09:54:19 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	David Newall <davidn@...idnewall.com>
Cc:	Nick Andrew <nick@...k-andrew.net>,
	Linas Vepstas <linasvepstas@...il.com>, david@...g.hm,
	Kyle Moffett <kyle@...fetthome.net>,
	Ben Goodger <goodgerster@...il.com>,
	Robert Hancock <hancockr@...w.ca>,
	linux-kernel@...r.kernel.org,
	"Jeffrey J. Kosowsky" <jeff@...owsky.org>,
	MentalMooMan <slashdot@...eshallam.info>,
	Travis Crump <pretzalz@...hhouse.org>, burdell@...ntheinter.net
Subject: Re: Bug: Status/Summary of slashdot leap-second crash on new years
 2008-2009

> The range of signed 32-bit times is 1901 through 2039, which has only
> one century, 2000, which is a leap year.  So the caveat for leap years
> is correct but unnecessary.

The standard however (and library code) were updated many years ago, so
the description is still wrong.

> So I've discoverd, at least on Ubuntu, something wonderful and
> reassuring.  It already works exactly the way I think is correct.  Look:
> I create a test timezone with no daylight saving and one leap second:

This is entirely configurable - see my earlier post about the "right" and
posix timezones. Really however that belongs on the glibc list.

As far as the kernel and leapseconds go - remember the kernel RTC support
does not know about leap seconds
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