linux-kernel - Re: Linux time code

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Message-ID: <20060829131533.GC31760@thunk.org>
Date:	Tue, 29 Aug 2006 09:15:33 -0400
From:	Theodore Tso <tytso@....edu>
To:	linux@...izon.com
Cc:	johnstul@...ibm.com, zippel@...ux-m68k.org,
	linux-kernel@...r.kernel.org, theotso@...ibm.com
Subject: Re: Linux time code

On Mon, Aug 28, 2006 at 11:28:29PM -0400, linux@...izon.com wrote:
> > While its possible to smooth out the leapsecond (which would be useful
> > to many folks), the problem is one's system would then diverge from UTC
> > for that leapsecond. 
> 
> The Posix-mandated behaviour *requires* diverging from UTC for some
> time period around the leap second.  All you can do is decide how
> to schedule the divergence.

POSIX mandates this for gettimeofday() and CLOCK_REALTIME.  

However, a conforming implementation, could (either in userspace or in
the kernel) provide access to other time bases, include TAI or the
proposed UTS time scales.

						- Ted
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