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To: cygwin AT cygwin DOT com
Subject: Re: 64-bit Heimdal/Cygwin, clock, daylight savings conundrum
References: <f5ba9bu28gl DOT fsf AT troutbeck DOT inf DOT ed DOT ac DOT uk>	<f5b61mi26vd DOT fsf AT troutbeck DOT inf DOT ed DOT ac DOT uk>	<20140409101004 DOT GO2437 AT calimero DOT vinschen DOT de>	<f5b1tx621j0 DOT fsf AT troutbeck DOT inf DOT ed DOT ac DOT uk>
From: ht AT inf DOT ed DOT ac DOT uk (Henry S. Thompson)
Date: Wed, 09 Apr 2014 19:02:18 +0100
In-Reply-To: <f5b1tx621j0.fsf@troutbeck.inf.ed.ac.uk> (Henry S. Thompson's message of "Wed\, 09 Apr 2014 12\:19\:31 +0100")
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ht writes:

> Corinna Vinschen writes:
>
>> On Apr  9 10:24, Henry S. Thompson wrote:
>>> [Clock behaving oddly/differently]
>>> Has something changed with system clock vs. hardware clock between 32-
>>> and 64-bit cygwin?  Or am I looking in the wrong place altogether?
>>
>> Hmm, maybe.  Apart from time_t being 64 bit (32 bit on i686), the
>> code for time handling is identical.  What's your $TZ set to?
>
> Europe/London in both cases.
>
> It occurs to me to check the Heimdal code to see if anything changed
> to enable 64-bit compilation. . .

Nah, much simpler than that :-( Four hours later, after abandoning the
attempt to compile heimdal from cygport and installing
heimdal-debuginfo, another hour of work with gdb establishes that by
default heimdal caches config info in a file in /tmp
(e.g. /tmp/krb5cc_1001) and despite a comment in the code which says
"We always try to remove the file", they don't.  And the cache
includes the offset of clock time from UTC.  So a cache which
persists over a change in, say DST, will be wrong wrt that!

Sigh.

Another time, I'll try to figure out why the cache isn't being deleted
-- _that_ might actually be a cygwin version issue.

ht
-- 
       Henry S. Thompson, School of Informatics, University of Edinburgh
      10 Crichton Street, Edinburgh EH8 9AB, SCOTLAND -- (44) 131 650-4440
                Fax: (44) 131 650-4587, e-mail: ht AT inf DOT ed DOT ac DOT uk
                       URL: http://www.ltg.ed.ac.uk/~ht/
 [mail from me _always_ has a .sig like this -- mail without it is forged spam]

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