From: Jonathan de Boyne Pollard on
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>
> That statement by Stevens is flat-out wrong. [...]
>
>> Was Stevens being overly cautious?
>>
> No, it was simply one of his rare mistakes.
>
In fairness to Stevens, the world before the advent of TTY job control
was a quite different one to the world after it. If this contradiction
of POSIX is anyone's mistake, it's the mistake of the people who updated
the book to address POSIX. You are referring to an edition of the book
claiming in its publicity blurb to have been updated for POSIX but
published half a decade after Stevens' death, remember.