Pretending known chardata is an I/O device?

[Сергей Прохоров]

Hi, Yestin,

I recently implemented (write-only) IO-server in epgsql:

https://github.com/epgsql/epgsql/pull/248/files#diff-bee3ee44dca8eaa3ab72727b8d11c695f2ae4dcf0a0534fc51323d0aaa1a3a9fR523-R550

I'd say it's quite easy task to do, the protocol itself is very compact and
well documented and it has a complete example:

https://erlang.org/doc/apps/stdlib/io_protocol.html

I think starting normal gen_server that takes your data string in `init/1`
or maybe receives it in a separate call would work fine. And you'd need to
handle `{io_request, ..}` messages in `handle_info` gen_server callback.

Regards,
Sergey
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