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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Proposal for shell completion in M-x shell RET
Date: Mon, 10 Sep 2007 19:55:43 -0400
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To: David Kastrup <dak@gnu.org>
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    Maybe this can help on some platforms?

    process-running-child-p is a built-in function in `C source code'.
    (process-running-child-p &optional PROCESS)

I think it is not reliable to use this, because input is ansynchronous.