You can also use `file-stream-buffer-mode` instead of manually flushing the
port:
https://docs.racket-lang.org/reference/port-buffers.html#(def._((quote._~23~25kernel)._file-stream-buffer-mode))
-Philip
On Thu, Nov 15, 2018 at 2:07 PM Brian Adkins <lojicdot...@gmail.com> wrote:
> That was it - thanks! I guess I was spoiled by Ruby's auto-flushing of
> "puts".
>
> On Thursday, November 15, 2018 at 2:02:07 PM UTC-5, Philippe M wrote:
>>
>> 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 <lojic...@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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