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From: Eli Zaretskii <e...@gnu.org>
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Subject: bug#12632: file permissions checking mishandled when setuid
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> Date: Mon, 15 Oct 2012 23:00:34 -0700
> From: Paul Eggert <egg...@cs.ucla.edu>
> CC: 12...@debbugs.gnu.org
> 
> > I believe also more efficient.
> 
> I thought the point of Bug#12587 was that on Windows,
> 'stat' can be way slower than faccessat, so much
> so that Emacs appears unresponsive.

Granted, I was talking only about Posix platforms.