X-Recipient: archive-cygwin@delorie.com
DomainKey-Signature: a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:date:from:to:subject:message-id:reply-to
	:references:mime-version:content-type:in-reply-to; q=dns; s=
	default; b=s25icZHBIB5s7Ej84bLHvzG6BwzxzcXpIuaBk3lcb1Y/dwYUyQfcq
	gr1MlBuSTJTny9M2ug5y8R8QeEEjjELYqI1YhDll5QMh7ReE3HJLQI7UD+s6/4sc
	KH9UHgSBsnA8ehAMGm8PYg4B79JBDVPV6kc1ZqSUJmNqDFxOQuNv8k=
DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:date:from:to:subject:message-id:reply-to
	:references:mime-version:content-type:in-reply-to; s=default;
	 bh=RBiciwnjBwMESu0kd7LxWFEeprI=; b=YZGJAB8KyU8C3ksDynrP5CLu7+b/
	j6sPomiBEQAaIwS81tL2WFGrkNq1Yd3ACyTlGDK4GWB4YAnItkIAo+IpjEKBrFTP
	kNGxtcErFKU9KLWIEQUI18ok7/2bJMjoXpLTk8NSgJDeuMM8tY7E1htaexsSBXHL
	4NMIHD6FDR/2vm8=
Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm
List-Id: <cygwin.cygwin.com>
List-Subscribe: <mailto:cygwin-subscribe@cygwin.com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin@cygwin.com>
List-Help: <mailto:cygwin-help@cygwin.com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner@cygwin.com
Mail-Followup-To: cygwin@cygwin.com
Delivered-To: mailing list cygwin@cygwin.com
Authentication-Results: sourceware.org; auth=none
X-Virus-Found: No
X-Spam-SWARE-Status: No, score=-5.9 required=5.0 tests=AWL,BAYES_00 autolearn=ham version=3.3.2
X-HELO: calimero.vinschen.de
Date: Thu, 18 Dec 2014 18:33:46 +0100
From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: ps questions
Message-ID: <20141218173346.GH10824@calimero.vinschen.de>
Reply-To: cygwin@cygwin.com
Mail-Followup-To: cygwin@cygwin.com
References: <CAO2ddnZChb-n9+Z1YEWCFSA=WTaYfkmHdjMZk7Te5JYckUDE+Q@mail.gmail.com> <5492EDFC.5080608@gmail.com> <CAO2ddnZHs=4GxUJtjgoyTXO2Or3oKzY6Rck=m9Mqfj6DgWUQUg@mail.gmail.com> <20141218171116.GF10824@calimero.vinschen.de> <8F8B22BA-B007-4F10-9B4F-9BD963D17059@etr-usa.com>
MIME-Version: 1.0
Content-Type: multipart/signed; micalg=pgp-sha1;	protocol="application/pgp-signature"; boundary="tpXmNJJzF/fVXUEg"
Content-Disposition: inline
In-Reply-To: <8F8B22BA-B007-4F10-9B4F-9BD963D17059@etr-usa.com>
User-Agent: Mutt/1.5.23 (2014-03-12)

--tpXmNJJzF/fVXUEg
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

On Dec 18 10:26, Warren Young wrote:
> On Dec 18, 2014, at 10:11 AM, Corinna Vinschen <corinna-cygwin@cygwin.com=
> wrote:
>=20
> > The <defunct> information is fetched from the process itself.  This
> > requires a living, valid Cygwin process, so the info isn't available for
> > Windows processes.
>=20
> On a Unix/Linux system, a process is marked <defunct> when the kernel
> knows it has died, but its parent hasn=E2=80=99t called wait(2) or similar
> yet, so the kernel keeps info about the process around with the
> expectation that this call will come later.
>=20
> So, you=E2=80=99re saying that Cygwin doesn=E2=80=99t do something simila=
r?

Similar, but not the same.  Cygwin isn't a kernel and the process
information is kept in shared memory regions held by the parent process
and the process itself.  This model has limitations you don't have on a
real kernel.

> If it did, it would be able to distinguish between dead Cygwin
> processes and dead native processes.  =E2=80=9CI didn=E2=80=99t start tha=
t one, so I
> will mark it <dead> instead of <defunct>,=E2=80=9D kind of thing.

The <defunct> in case of a Windows process means only that the calling
process was incapable of fetching this information.  It doesn't know
the state, because the target process didn't reply with the requested
information.  Actually, it didn't reply at all.  That's one of the
limitations of the model.


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

--tpXmNJJzF/fVXUEg
Content-Type: application/pgp-signature

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1
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=Beys
-----END PGP SIGNATURE-----

--tpXmNJJzF/fVXUEg--