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Date:	Thu, 18 Dec 2014 18:33:46 +0100
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: ps questions
Message-ID:	<20141218173346.GH10824@calimero.vinschen.de>
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On Dec 18 10:26, Warren Young wrote:
> On Dec 18, 2014, at 10:11 AM, Corinna Vinschen <corinna-cygwin AT cygwin DOT 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

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