bug#10257: 23.3.1 Cygwin: network drives - file is write protected (false positive)

[Eli Zaretskii]

> Date: Tue, 13 Dec 2011 20:05:47 +0200
> From: jari <jari.aalto@cante.net>
> Cc: kbrown@cornell.edu, 10257@debbugs.gnu.org
> 
> User already has a write access to the device.
> 
> Emacs just doesn't know / guesses wrong / environment is complex /

If Cygwin's implementation of the Posix APIs were compliant, it would
know/guess correctly.

> possibly uses wrong methodology (see Ken's notes about using uid, gid
> for write access check).

Let's see where the discussion of Ken's questions leads us.  Only then
we will be able to conclude whether the current methodology is wrong
or not.