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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Can't interrupt directory_files_internal run from
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> From: "Richard M. Stallman" <rms@gnu.org>
> Date: Fri, 05 Aug 2005 16:38:14 -0400
> Cc: emacs-devel@gnu.org
> 
> Alternatively, it could use start-process to run ls asychronously
> as a way to find out whether the directory is empty.

There's no need to run any program just to know if a directory is
empty.  Emacs has primitives which will tell that directly (e.g.,
file-attributes) and do that faster.