BSD:sockets::SVID:(what?)

[Guy Harris]

> This requires a small change in strwrite() and a distinquishable message from
> the tty module.  However I would not call these `changes to the mechanism'.

*I* would call them that; adding a new message for these purposes *does* change
the mechanism.

In any case, you can't do it without changing "strread()" (which is what you
meant, not "strwrite()"), which is the real point here.