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

From: Thorsten Jolitz
Subject: Re: How to communicate with a running external process with given PID?
Date: Sat, 20 Jul 2013 13:57:10 +0200
User-agent: Gnus/5.130002 (Ma Gnus v0.2) Emacs/24.3 (gnu/linux)

"Pascal J. Bourguignon" <> writes:

> 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. 


>> 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.

> Ok, I'll bit the bullet: the only communication channel available to
> you, a-priori, knowing only the process ID, is the kill(2) syscall.
> And you're lucky, you can send more than one bit of information with
> each kill call!

Yes, I should read UNP, but actually I read quite a lot of stuff about
this topic, but reading about it and starting to use it is not the same
thing. And I did not know that 'kill is so useful and universal, only
used it for its core task so far.

But in the light of your answer I think I go for the HTTP client/server
solution, expecially since the server stuff is all there anyway. 

Thanks for the tips. 


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