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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Fix needed for communication with gpg-agent
Date: Fri, 23 Feb 2007 14:36:38 -0500
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Xref: news.gmane.org gmane.emacs.devel:66702
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    So the problem is that pinentry does not have exclusive access to the
    tty.

It should not be hard to program Emacs to turn off the signal handler
for tty input while it calls gpg.  That way, Emacs won't notice there
is any input, and won't read any.

This could be a new function made as a variant of call-process.

Would this solve the problem?