Re: y-or-n-p and emacs --daemon

[Dan Nicolaescu <dann@ics.uci.edu>]

Chong Yidong <cyd@stupidchicken.com> writes:

  > Espen Wiborg <espenhw@grumblesmurf.org> writes:
  > 
  > >>    $ emacs-23 -Q --daemon --eval '(y-or-n-p "hello? ")'
  > >>
  > >> 1. It hangs indefinitely,
  > >> 2. it does not detach properly (it forks, but the parent doesn't exit),
  > >> 3. it doesn't start the server.
  > >>
  > >> Now the problem is that y-or-n-p is called from many places, so
  > >> depending on the configuration there is some chance that Emacs will
  > >> ask for user interaction before initialisation is finished. There is
  > >> even one in server-start (which AFAICS won't be triggered in daemon
  > >> mode, but still...).
  > >
  > > Actually, this yes-or-no-p *is* triggered in daemon mode, but only
  > > (AFAICT) in the case uncovered by bug #1310, where a client's X
  > > connection is lost and the daemon tries to shut down.
  > 
  > The only thing I can think of is to make y-or-n-p and yes-or-no-p
  > default to "no" when only the daemon's dummy terminal is open.  

Bad idea:
(unless (y-or-n-p "Stop me from removing all your files") 
        /bin/rm -rf /
        )

  > Does anyone have a better suggestion?

Ignore it, or fix it properly: so that it works like y-or-n-p when using -batch.