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Re: How to communicate with a running external process with given PID?

From: Pascal J. Bourguignon
Subject: Re: How to communicate with a running external process with given PID?
Date: Sat, 20 Jul 2013 12:51:46 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.2 (gnu/linux)

Thorsten Jolitz <> writes:

> Hi List, 
> say I want to call another program (more exactly, another Lisp program
> that is not Emacs Lisp) from an Emacs Lisp program. 
> My special requirement is that I don't want to start a new Emacs
> subprocess, but want to communicate with an existing (running) process.
> And there maybe several running instances of this program at the same
> time, so I want to communicate with one existing (running) process with
> a given PID.
> Now there is splendid support in Emacs for communicating with other
> programs, but always based on the assumption that Emacs starts and
> controls a new subprocess. 
> There is chapter 37.12 "Accessing Other Processes" in the Elisp manual,
> and I can do successfully 
> ,-------------------------
> | (process-attributes PID)
> `-------------------------
> to receive a lot of information about the process I want to communicate
> with. 
> But what then? Where are the (e.g.) `process-send-string' or
> `process-send-region' functions for external processes I could use to
> communicate with my external program?
> I could run a server in the external lisp program and use a
> network-connection-object to send http-requests (e.g. with the help of
> emacs-request.el) via TCP - but that seems to be total overkill for my
> requirements.
> I just want to use a running external process with a given PID in a
> similar way I would use (a)synchronous processes created from Emacs with
> `call-process' or `start-process'. How can I do that?
> Maybe there is an obvious answer to this question that I don't see.
> Would be nice. 

You need to read UNP.

__Pascal Bourguignon__           
A bad day in () is better than a good day in {}.  
You know you've been lisping too long when you see a recent picture of George 
Lucas and think "Wait, I thought John McCarthy was dead!" -- Dalek_Baldwin

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