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Re: RFC [PATCH] BZ#1077902: New API gettimezone

From: Paul Eggert <eggert at cs dot ucla dot edu>
To: Carlos O'Donell <carlos at redhat dot com>, Rich Felker <dalias at aerifal dot cx>, P J P <pj dot pandit at yahoo dot co dot in>
Cc: "libc-help at sourceware dot org" <libc-help at sourceware dot org>
Date: Fri, 04 Apr 2014 00:39:24 -0700
Subject: Re: RFC [PATCH] BZ#1077902: New API gettimezone
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Carlos O'Donell wrote:

What's the problem and do we have a BZ open for this?


I don't know of a BZ.

The problem is that you're running a multithreaded server and you wantto output a time stamp in the client's time zone. With glibc, that's apain, since the TZ setting is process-wide, and if one of your threadssets TZ='Europe/Moscow' (say), then all your threads are affected.

NetBSD addresses this by having functions like localtime_rz, which islike localtime_r except with an extra timezone_t argument. There areextra functions like tzalloc to create timezone_t objects.I don't know of any other system with these primitives other than Minix3, which uses this part of NetBSD userland. See:


http://netbsd.gw.com/cgi-bin/man-cgi?localtime_r++NetBSD-current

It's been proposed to add these functions to the public-domain timezonecode hosted by IANA, but nobody's gotten around to doing that yet.

Follow-Ups:
- Re: RFC [PATCH] BZ#1077902: New API gettimezone
  - From: Carlos O'Donell

References:
- Re: RFC [PATCH] BZ#1077902: New API gettimezone
  - From: Paul Eggert
- Re: RFC [PATCH] BZ#1077902: New API gettimezone
  - From: Paul Eggert
- Re: RFC [PATCH] BZ#1077902: New API gettimezone
  - From: Carlos O'Donell
- Re: RFC [PATCH] BZ#1077902: New API gettimezone
  - From: Paul Eggert
- Re: RFC [PATCH] BZ#1077902: New API gettimezone
  - From: Carlos O'Donell
- Re: RFC [PATCH] BZ#1077902: New API gettimezone
  - From: Paul Eggert
- Re: RFC [PATCH] BZ#1077902: New API gettimezone
  - From: Carlos O'Donell

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