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X-HELO: calimero.vinschen.de
Date: Thu, 18 Dec 2014 19:34:30 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: ps questions
Message-ID: <20141218183430.GI10824@calimero.vinschen.de>
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On Dec 18 18:56, BGINFO4X wrote:
> 2014-12-18 18:11 GMT+01:00 Corinna Vinschen <...>
> > 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
> Hello again, forgive me if this is stupid:
>=20
> If any cygwin process has the values
> cwd=3D/proc/$PID
> root=3D/
>=20
> Instead of fetching the information, you can "hardcode" the values. Isn't=
 it?

And how much sense does it make?

The root value is most of the time ok, unless a process runs under
chroot.

The cwd value on the other hand...  /proc is a virtual, Cygwin-only
directory and isn't a valid CWD for a non-Cygwin process.
And you can't call the OS for the CWD of another process.  On Windows,
the CWD is a process-local concept, not supported by the kernel.
Fetching the CWD of a process requires read access to the VM of a
process and a bit of undocumented NT magic.


Corinna

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

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