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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: emacsclient socket ownership
Date: Wed, 05 Dec 2018 21:46:32 +0200
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> From: Glenn Morris <rgm@gnu.org>
> Date: Wed, 05 Dec 2018 14:38:19 -0500
> Cc: Paul Eggert <eggert@cs.ucla.edu>, Stefan Monnier <monnier@iro.umontreal.ca>,
> 	emacs-devel@gnu.org
> 
> > Is XDG_RUNTIME_DIR really a good choice?
> 
> It is the right directory to use for these things, yes.

Maybe we should have a defcustom for those who don't want
XDG_RUNTIME_DIR to be used, even if it exists.  Or maybe we should
check it for being writable before using it, and otherwise fall back
on TMPDIR, as before.