[TUHS] FD 2

[Rob Pike]

In Plan 9 we made /dev/tty (there called /dev/cons) fully virtual, a
fiction that provided the semantics. I agree that it's a pity the /dev/tty
kludge persists as a kernel hack.

And then we have pttys, speaking of pitys.

-rob


On Mon, Jan 30, 2023 at 6:50 PM <arnold at skeeve.com> wrote:

> > > Where this is done is, as I posted earlier, in /etc/init.    Init
> opens the
> > > tty device and dups it to 1 and then invokes either the shell (if
> we're in
> > > single user mode) or getty for interactive mode.
> > > This was done in V6 and PWB (1).   In V7, init added a second dup for
> file
> > > descriptor 2.
>
> What I really like is how in V8 - V10 /dev/tty was a (sym)link to
> /dev/fd/3,
> and init simply did one more dup call. That eliminated the special tty
> device
> driver and was a lovely generalization / simplification.  It's too bad this
> was never picked in the commercial Unixes or in Linux.
>
> Arnold
>
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