CBREAK translation (HACKers, note)

[Guy Harris]

> I noticed some discussion of the "Berkleyism" CBREAK, recently. ...
> In the new arrangement of terminal controls, the matters of canonical input
> and signal interception are controlled by separate flags. Thus, the 
> equivalent of CBREAK seems to be:
> 
> 	(ISIG | ~ICANON)

This is correct.  CBREAK in the V7 terminal driver (and in the enhanced V7
driver that comes with Berkeley systems) is, in effect, the negation of ICANON
in the System III/V terminal driver.