3-button mice and clearing dtr

[Borja Marcos borjam@we.lc.ehu.es]

> 
> If your mouse is like mine, and reverts to 2-button behaviour
> if dtr is reasserted, you'll find that the suggestion from
> forsyth@plan9.cs.york.ac.uk:
> 
> > change aux/mouse.c
> >
> > add a timedwrite(ctl, "d0", 2)
> 
> doesn't do the trick.  aux/mouse finishes by writing a "serial ..."
> command to /dev/mousectl, which causes the kernel to raise dtr
> and then lock the serial port so it can't be changed again.
> 
> A sensible solution would probably require adding a new parameter
> to aux/mouse, and to routines serialmouse() and uartspecial() in the
> kernel.  Or buying a proper three-button mouse.

	You an also adopt the bloody, hardware-based solution :-)

	Borja.

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