bug#1540: emacsclient -t fails under su

[Dan Nicolaescu]

Glenn Morris <rgm@gnu.org> writes:

  > Dan Nicolaescu wrote:
  > 
  > > Not sure what to do.  The quick way out would be for emacsclient to
  > > check if the tty is writable, and refuse to try to connect in case it is
  > > not.  But is that TRTD?
  > 
  > Anything that stops the crash has to be an improvement.

The crash should be gone now.

  > I know nothing about how this all works, but my naive expectation was
  > that since emacs -nw works, emacsclient -t should too. But if that's
  > not possible, fine. If it's possible but difficult, just stopping the
  > crash and leaving the rest open as a wishlist is fine too.

Not sure about the underlying problem. 
It would be interesting to know if this happens on all OSes.