From owner-freebsd-hackers@FreeBSD.ORG  Fri Aug  7 21:14:42 2009
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 81036106566B
	for <freebsd-hackers@freebsd.org>; Fri,  7 Aug 2009 21:14:42 +0000 (UTC)
	(envelope-from psteele@webmail.maxiscale.com)
Received: from k2smtpout01-01.prod.mesa1.secureserver.net
	(k2smtpout01-01.prod.mesa1.secureserver.net [64.202.189.88])
	by mx1.freebsd.org (Postfix) with SMTP id 40AD68FC0A
	for <freebsd-hackers@freebsd.org>; Fri,  7 Aug 2009 21:14:42 +0000 (UTC)
Received: (qmail 18169 invoked from network); 7 Aug 2009 21:14:42 -0000
Received: from unknown (HELO owa.webmail.maxiscale.com) (72.167.52.135)
	by k2smtpout01-01.prod.mesa1.secureserver.net (64.202.189.88) with
	ESMTP; 07 Aug 2009 21:14:42 -0000
X-MimeOLE: Produced By Microsoft Exchange V6.5
Content-class: urn:content-classes:message
MIME-Version: 1.0
Content-Type: text/plain;
	charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
Date: Fri, 7 Aug 2009 14:20:18 -0700
Message-ID: <B8A480488C0C6849826655761349EA431F7171@owa.webmail.maxiscale.com>
X-MS-Has-Attach: 
X-MS-TNEF-Correlator: 
Thread-Topic: How to signal a time zone change?
Thread-Index: AcoXo6gPJ4J8K2XaQaW7axiI+bcOPwAAAunQ
References: <B8A480488C0C6849826655761349EA431F716A@owa.webmail.maxiscale.com>
	<4A7C9738.10103@elischer.org>
From: "Peter Steele" <psteele@webmail.maxiscale.com>
To: "Julian Elischer" <julian@elischer.org>
X-Mailman-Approved-At: Fri, 07 Aug 2009 21:17:00 +0000
Cc: freebsd-hackers@freebsd.org
Subject: RE: How to signal a time zone change?
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 07 Aug 2009 21:14:42 -0000

>You need to signal your app in some way.. Assuming you have source for
the app then you can monitor /etc/localtime (or /etc) for change with
kevent.

Signaling our C apps aren't the problem. We have an IPC framework in
place and we can easily tell the C apps when the user has changed the
time zone via the GUI. The problem is I can't figure out what C calls
are needed to instantiate the time zone change. Based on the
documentation, I would think that tzset() would do the trick once
/etc/localtime has been updated by the Java app, but this does not work.
The only way I've discovered that works is to restart our C apps and we
want to avoid that.