X-Recipient: archive-cygwin AT delorie DOT com
X-SWARE-Spam-Status: No, hits=-1.5 required=5.0	tests=AWL,BAYES_00,T_RP_MATCHES_RCVD
X-Spam-Check-By: sourceware.org
To: cygwin AT cygwin DOT com
Subject: Re: Resetting time via time server doesn't affect cygwin 'date'
References: <f5bpqp8wy7m DOT fsf AT calexico DOT inf DOT ed DOT ac DOT uk>	<imvla1$upo$1 AT dough DOT gmane DOT org>	<20110330164538 DOT GB25534 AT calimero DOT vinschen DOT de>
From: ht AT inf DOT ed DOT ac DOT uk (Henry S. Thompson)
Date: Wed, 30 Mar 2011 18:41:14 +0100
In-Reply-To: <20110330164538.GB25534@calimero.vinschen.de> (Corinna Vinschen's message of "Wed, 30 Mar 2011 18:45:38 +0200")
Message-ID: <f5bd3l8wlol.fsf@calexico.inf.ed.ac.uk>
User-Agent: Gnus/5.1008 (Gnus v5.10.8) XEmacs/21.4.21 (linux)
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
X-Edinburgh-Scanned: at treacle.ucs.ed.ac.uk    with MIMEDefang 2.60, Sophie, Sophos Anti-Virus, Clam AntiVirus
X-IsSubscribed: yes
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
Precedence: bulk
List-Id: <cygwin.cygwin.com>
List-Unsubscribe: <mailto:cygwin-unsubscribe-archive-cygwin=delorie DOT com AT cygwin DOT com>
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com

Corinna Vinschen writes:

> There's an internal counter which is initialized by the first Cygwin
> process started in a session.  So time chanegs made by a Cygwin process
> are seen by other Cygwin processes in the same session, but time changes
> outside of Cygwin or outside of the same session are not seen, unless all
> Cygwin processes in a session are stopped and restarted.  This will be
> fixed at one point.

So running something like this

   date -s `cmd /c echo %time%`

either _ad lib_ or as a cron job every few days will limit the damage,
at the cost of losing a bit across the board each time you do it,
since the situation is _not_ symmetrical.  That is, because date -s in
Cygwin _does_ reset the windows clock. . .

ht
-- 
       Henry S. Thompson, School of Informatics, University of Edinburgh
      10 Crichton Street, Edinburgh EH8 9AB, SCOTLAND -- (44) 131 650-4440
                Fax: (44) 131 651-1426, 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]

--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple