[talk] Receiving the output of a terminal

Jesse Callaway bonsaime at gmail.com
Wed Jul 12 10:49:30 EDT 2017

On Wed, Jul 12, 2017 at 7:48 AM, Jesse Callaway <bonsaime at gmail.com> wrote:

> On Wed, Jul 12, 2017 at 2:59 AM, Thomas Levine <_ at thomaslevine.com> wrote:
>> How can I receive the output of a tty in another program? Or, perhaps
>> an easier way of asking this: is there good documentation on how to
>> implement a terminal emulator?
>> To give you an idea of what I am looking for, it could naïvely sort of
>> make sense that the following procedure would accomplish what I want.
>> Inside the sending virtual terminal, run this.
>>   ln -s $(tty) /tmp/tty
>> Then, inside the receiving program, run this
>>   cat /tmp/tty
>> Of course it does not do what I want, probably because both the first
>> terminal and the cat are consuming output of the tty.
>> I want this so I can improve my screen reader software. In the present
>> implementation I have patched script(1) so that output to the file is
>> less buffered and so that header and footer messages are not printed.
>> https://thomaslevine.com/scm/tsh/artifact/ab625a43ee958dba
>> Then I send the output from the resulting patched script(1) to a FIFO,
>> and I read from the FIFO into espeak.
>> https://thomaslevine.com/scm/tsh/artifact/75f981520a431d96
>> I think I should be able to implement this far more simply by reading
>> directly from an ordinary tty rather than using script(1).
>> My present implementation is still much better than that of any other
>> screen reader that I am aware of. Mine is far simpler than all the
>> others that I have read about because the others all implement
>> unnecessary non-standard alternatives to things that already already
>> exist in shells or in Unix-style programs that can easily be called from
>> shells. The main benefit of doing this without patching script(1) is
>> thus to make it easier to port to other systems.
>> _______________________________________________
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> Funny I was looking to do something similar the other day. Wanted to pipe
> stdout via a tee to netcat. I think creative use of the "screen" program
> could do it, but haven't spent enough time in the gedankenwelt to get it
> done.
> --
> -jesse

Nevermind, I see you have the raw case handled.

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