Patch ID	: P94082401
Summary		: Return EBUSY instead of EIO on busy pty opens
Status		: Mandatory
Date		: 08/24/94
Release		: OS 4.1C
Architectures	: Series5 Series6 S4000
Affected bugs	:
	2693

Changed files	:
	sys/os/tty_pty.c (delta 1.2)

Problem Description:
	Customers attempting to fully utilize ptys for xterm
	and telnet sessions were encountering EIO on open of
	pty's that were busy. This patch changes the error
	code returned to the proper code, EBUSY.

