Re: Fix needed for communication with gpg-agent

[Richard Stallman]

    The problem is that I have found no way to set pinentry as the
    foreground process.  tcsetpgrp() won't work because pinentry runs in a
    different session (is is being called by gpg-agent which has used
    setsid).

Alas, I don't remember what setsid does, so I can't think about this
question.  However, someone reported that pinentry was able to read
from the tty, and that the only problem was to stop Emacs from also
trying to read.  If that is true, setsid apparently is not a real
obstacle -- at least on one kind of system.  Maybe it is a real
obstacle on some other kinds of system.