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From:	"Rafael Kitover" <caelum AT debian DOT org>
To:	<cygwin AT cygwin DOT com>
Subject:	RE: localtime_r not returning local time
Date:	Thu, 12 Feb 2004 13:10:03 -0800
MIME-Version:	1.0
In-Reply-To:	<20040208184015.GB880@efn.org>
Message-ID:	<BAY12-DAV65cuwGVLlR00032b73@hotmail.com>
X-OriginalArrivalTime:	12 Feb 2004 21:10:04.0562 (UTC) FILETIME=[95C0DF20:01C3F1AC]

Would it be a lot of overhead to have something like tzset be called in the
bootstrap code for launching Cygwin programs? Or maybe just have a DLL global
default, based on windows time zone, and just allow processes to reset it for
themselves (and any children.)

-- 
Rafael

>-----Original Message-----
>From: cygwin-owner AT cygwin DOT com [mailto:cygwin-owner AT cygwin DOT com] On Behalf Of
>Yitzchak Scott-Thoennes
>Sent: Sunday, February 08, 2004 10:40 AM
>To: cygwin AT cygwin DOT com
>Subject: localtime_r not returning local time
>
>localtime_r is (if no direct or indirect call to tzset has been made)
>returning UTC time.
>
>This is the source of the cygwin perl bug where perl's localtime() is
>returning UTC time.  See:
>http://groups.google.com/groups?selm=rt-3.0.8-26136-
>75339 DOT 11 DOT 8378531676315 AT perl DOT org
>
>Perl does not ever directly call tzset (except when perl code calls
>POSIX::tzset).  Should it do so (at least at startup), or should
>localtime_r be returning a TZ-based time even when tzset hasn't been
>called?
>
>My reading of susv3:
>   "Local timezone information is used as though localtime() calls tzset().
>
>   The relationship between a time in seconds since the Epoch used as
>   an argument to localtime() and the tm structure (defined in the
>   <time.h> header) is that the result shall be...corrected for timezone
>   and any seasonal time adjustments...
>
>   The same relationship shall apply for localtime_r().
>   ...
>   Unlike localtime(), the reentrant version is not required to set
>   tzname.
>
>is that while localtime_r need not (should not?) set the daylight,
>timezone, and tzname globals, it should still use local time as if
>tzset had been called.  Admittedly, the standard is vague on this
>point.
>
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