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Retrieving per-process environment block?
- From: Erik Bray <erik dot m dot bray at gmail dot com>
- To: cygwin at cygwin dot com
- Date: Thu, 17 Nov 2016 14:30:24 +0100
- Subject: Retrieving per-process environment block?
- Authentication-results: sourceware.org; auth=none
Hi all,
For a quick bit of background, I'm working on porting the highly
useful psutil [1] Python library to Cygwin. This has proved an
interesting exercise, as much of the functionality of psutil works on
Cygwin through existing POSIX interfaces, and a handful of
Linux-specific interfaces as well. But there are some bits that
simply don't map at all.
The one I'm struggling with right now is retrieving Cygwin environment
variables for a process (under inspection--i.e. not listing a
process's environment from within that process which is obviously
trivial).
I've looked at every route I could conceive of but as far as I can
tell this is currently impossible. That's fine for now--I simply
disable that functionality in psutil. But it is unfortunate, though,
since the information is there.
There are a couple avenues I could see to this. The most "obvious"
(to me) being to implement /proc/<pid>/environ.
I would be willing to provide a patch for this if it would be
accepted. Is there some particular non-obvious hurdle to this that it
hasn't been implemented? Obviously there are security
implications--the /proc/<pid>/environ should only be readable to the
process's owner, but that is already within Cygwin's capabilities, and
works for other /proc files.
Thanks,
Erik
[1] https://pythonhosted.org/psutil/
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