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From: "Richard M. Stallman" <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: [czkmt@remus.dti.ne.jp: open-network-stream in batch mode
	causes SIGPOLL under GNU/Linux]
Date: Thu, 13 Oct 2005 00:53:20 -0400
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    SIGIO is only used for keyboard input, so in a noninteractive session it
    is not useful.

Yes, I remember now.  wait_reading_process_output does not use
signals to determine when processes have output, it just uses
select for that.

So, if you make request_sigio a no-op in batch mode, does that in fact
give correct results?  If so, would you please do it?