While you're hacking SUSPEND-time I/O...

[Kent M. Pitman <KMP at MIT-MC>]

This was reported once before but continues to cause problems. If there is
a tty channel other than TYI/TYO open at SUSPEND time, SUSPEND fails on an
open-channels error. Could you please make it close these channels and re-
open them in the same mode automatically? It's a real screw for this not to
happen because I don't always have control over the actual suspension process
(someone else's code may be doing the dumping and may not realize I've opened
an extra tty channel ... and I don't necessarily have a hook which allows
me to get this channel re-opened after dump time ...) If the problem is not
clear, I can elaborate, but I don't see any reason not to do it. Eg, try
suspending a Macsyma sometime and you'll see the problem ... 
-kmp