On 2016-10-27, Paul Rubin <no.email@nospam.invalid> wrote:
> Terry Reedy <tjre...@udel.edu> writes:
>
>> Today, ethernet-connected *nix servers have no keyboard, mouse, or
>> even a directly connected terminal.
>
> Usually you ssh into them and connect to a pty which supports the
> same ioctls that a real terminal would.
On all the Unixes/Linuxs I know of, a pty supports a _subset_ of those
that a real tty supports. The fact that some of them are missing has
annoyed me for decades because it prevents you from implementing a
serial port in user-space[1]. I've offered a few times to extend the
Linux pty driver to support the same set of ioctl calls that a tty
does (so that it could be used in place of a tty generally), but I've
never gotten any response.
> I use screen editors over ssh all the time, not to mention filters
> like "more" where you press the space bar to scroll to the next
> page. It's sad that there's no easy way to do that in Python.
Yep, among the ioctl calls that ptys do support are those that allow
you to do raw and non-blocking input.
[1] The fact that Windows allows you to implement a serial port in
userspace and Linux doesn't just adds insult to injury.
--
Grant
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