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

[Thorsten Jolitz <tjolitz@gmail.com>]

"Pascal J. Bourguignon" <pjb@informatimago.com> writes:

> Thorsten Jolitz <tjolitz@gmail.com> 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. 

[..snip..]

>> 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. 

-- 
cheers,
Thorsten