In article <20000721165950.A2746@pyy.jmp.fi>
jmarin@pyy.jmp.fi writes:

> I wrote a small test program and I can read data off the master end of the
> pty, but I get no notification when the slave changes port speed or other
> parameters.  I guess I must be doing something wrong, but I don't know

By a look at sys/kern/tty_pty.c, the EXTPROC termios flag seems to be
required.  Try

	stty -f /dev/ttyqf extproc

Yeah, the user can drop the flag....
The master side should probably re-enaable the flag
when it detects that the flag was dropped.
-- 
ITOH, Yasufumi