Hi Brian

I think you need to add a call to flush-output after sending data to outp

Regards
Philippe


Le jeu. 15 nov. 2018 à 19:51, Brian Adkins <lojicdot...@gmail.com> a écrit :

> I'm porting a Ruby application to Racket (will be deployed on Linux, but
> I'm developing on OSX). It uses the s3270 terminal emulator to access a
> mainframe. An example in Ruby is:
>
> IO.popen('s3270 L:ssl3270.example.com:2023', 'r+') do |pipe|
>   pipe.puts "ascii"
>   puts (pipe.gets)
>   puts (pipe.gets)
> end
>
> That issues the "ascii" command, and then reads & displays 2 lines of
> output. It seems that Racket's subprocess is a reasonable choice for this,
> so I tried the following:
>
> (define-values (subp inp outp errp)
>   (subprocess #f #f #f "/usr/local/bin/s3270" "L:ssl3270.example.com:2023
> "))
> (displayln "ascii" outp)
> (displayln (read-line inp))
> (displayln (read-line inp))
>
> It seems to be connecting to the mainframe because I got a request from
> Little Snitch to allow the outbound connection. The s3270 emulator behaves
> similar to telnet, if I invoke the command in a shell, the program will
> start, then I'll enter ascii and it will display a screenful of lines. I
> must be misunderstanding subprocess or the associated IO functions. Any
> suggestions?
>
> Thanks,
> Brian
>
>
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