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From: Sascha Wilde <wilde@sha-bang.de>
Cc: kzeitler@lucent.com, Eli Zaretskii <eliz@gnu.org>, emacs-devel@gnu.org
Subject: Re: Can't interrupt directory_files_internal run from timer-event-handler
Date: Sun, 14 Aug 2005 22:13:09 +0200	[thread overview]
Message-ID: <20050814201309.GA3226@kenny.sha-bang.local> (raw)
In-Reply-To: <E1E2Hy0-0006QR-9W@fencepost.gnu.org>


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On Mon, Aug 08, 2005 at 08:27:40PM -0400, Richard M. Stallman wrote:
>     I'm not an expert on this, but I think it's impossible to create such
>     alternate names, since GNU Find uses this fact to detect directories
>     with no subdirectories.
> 
> Linux seems to refuse to do this even if you are root.
> But I believe that root could do it on Unix at some point.
> Maybe that was only in old versions in the early 80s.

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...  ;-))

Every more modern Unix I tried, whether free or proprietary, whether
SysV or BSD based, refuses to do this even for root.

So I'd think that this case can be safely ignored.  I don't know about
non unixoid systems, though.

cheers
sascha
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  reply	other threads:[~2005-08-14 20:13 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-08-05  9:03 Can't interrupt directory_files_internal run from timer-event-handler Klaus Zeitler
2005-08-05 20:38 ` Richard M. Stallman
2005-08-06  6:57   ` Eli Zaretskii
2005-08-07 17:15     ` Richard M. Stallman
2005-08-07 18:15       ` Eli Zaretskii
2005-08-08  8:44         ` Johan Vromans
2005-08-08 14:32           ` Johan Vromans
2005-08-09  0:27         ` Richard M. Stallman
2005-08-14 20:13           ` Sascha Wilde [this message]
2005-08-15 16:04             ` Richard M. Stallman
2005-08-09 23:15     ` Stefan Monnier
2005-08-09 23:07   ` Stefan Monnier

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