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From: Laurent Bercot <ska-dietlibc@skarnet.org>
To: musl@lists.openwall.com
Subject: Re: Pending patches/issues before 0.9.15 release?
Date: Thu, 21 Nov 2013 23:04:52 +0000	[thread overview]
Message-ID: <528E9194.7090209@skarnet.org> (raw)
In-Reply-To: <20131121225440.GI1685@port70.net>


> according to the official tzdata code the "right/" directory
> is obsolete and different path is used for this now

  Oh ? I will definitely investigate this more.


> "The advantage of this scheme is that TAI−10 uniquely refers
> to an instant in time, and the difference between two such
> values determines the interval between these instants"
>
> is not true, a single time coordinate cannot uniquely refer to
> an instant in time (TAI only specifies the frame of reference
> since 1977, before that it was largely nonsense and after that
> it only measures the time somewhat accurately for observers at
> sea level in rest, but eg outside the gravity well of earth it
> is off by 22ms/year)

  Until we can go back to before 1977 or have computers outside the
gravity well of Earth, this is not what matters. What matters is that
we need a linear measure of time to synchronize our system clocks on,
and TAI is exactly this.


> knowing that TAI is non-conforming you need to provide a strong
> use-case for it

  I believe that Linux kernels crashing all over the world because of
a leap second happening makes a pretty strong case for not having the
system clock jump around. There are several solutions for that, but
none of them is simpler than just ignoring the drift at a system level
and perform conversions in userland when needed.
  I'll follow Rich's advice and try to provide a musl patch that's
minimally invasive, when I've found the right way to proceed with
timezones.

-- 
  Laurent



  reply	other threads:[~2013-11-21 23:04 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-11-21  1:30 Rich Felker
2013-11-21  9:40 ` Laurent Bercot
2013-11-21 16:39   ` Rich Felker
2013-11-21 16:55     ` Szabolcs Nagy
2013-11-21 19:27     ` Laurent Bercot
2013-11-21 19:44       ` Rich Felker
2013-11-21 20:07         ` Daniel Cegiełka
2013-11-21 20:34           ` Rich Felker
2013-11-21 22:54             ` Laurent Bercot
2013-11-24 11:06         ` zoneinfo file parsing in __tz.c Laurent Bercot
2013-11-24 12:22           ` Szabolcs Nagy
2013-11-21 22:54       ` Pending patches/issues before 0.9.15 release? Szabolcs Nagy
2013-11-21 23:04         ` Laurent Bercot [this message]
2013-11-22  0:18           ` Szabolcs Nagy
2013-11-21 23:05         ` Rich Felker
2013-11-21 19:21 ` John Spencer
2013-11-23 22:02 ` Rich Felker

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