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From: Stefan <monnier@iro.umontreal.ca>
Newsgroups: gmane.emacs.devel
Subject: Re: BLOCK_INPUT on Mac OS X
Date: 06 Sep 2004 12:17:45 -0400
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> I tried SYNC_INPUT with the X11 build on Mac OS X, which can use SIGIO
> for notification of input events.  It worked fine, but I noticed that
> we couldn't quit a synchronous subprocess if it produced no output.
> For example, `M-! yes RET' can be quit but `M-! sleep 10 RET' cannot.

Can you try and figure out where in the C code is Emacs looping?
A well placed QUIT in there should do the trick.


        Stefan