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From: "Richard M. Stallman" <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Can't interrupt directory_files_internal run from
	timer-event-handler
Date: Mon, 15 Aug 2005 12:04:43 -0400
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    Yes, indeed Unix v5 (fifth edition from 1974, that is _not_ SysV!),
    does allow root to make hard links on directories.  But the seventh
    edition from 1978 already prohibits it.  (sorry, at the moment I don't
    have a v6 at hand to test it there...  ;-))

Thanks for looking this up.