wall & GNU emacs on ptys interact poorly

[bugs at shire.cs.psu.edu]

Serial Number:	922E0914
Machine Type:	Sun 4/280
O/S Version:	SunOS 4.0.3
		333 Whitmore Laboratory, University Park, PA   16802
Phone Number:	+1 814 865 9723

Description:
	In GNU Emacs on a pseudo-tty, after receiving a wall message,
	your tty stops sending output and/or stops receiving input.
	Killing Emacs repairs the problem.

Repeat-By:
	% (sleep 30; wall </etc/termcap) &
	% emacs