bug#55153: 29.0.50; Implement system_process_attributes on Cygwin

[Ken Brown]

On 4/27/2022 11:00 AM, Ken Brown wrote:
> I just noticed, as a result of the failure of 
> desktop-tests--emacs-pid-running-p, that system_process_attributes was never 
> implemented on Cygwin.  This turns out to be quite easy to do since most of the 
> GNU/Linux code works without change on Cygwin.  I'll submit a patch in a 
> follow-up email.

Patch attached.  It's written against the master branch, but it can easily be 
backported to the release branch.  It seems safe enough to me, but I don't have 
strong feelings about it.

Ken

0001-Implement-system_process_attributes-on-Cygwin.patch
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