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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: Mon, 22 Jul 2013 20:16:41 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.2 (gnu/linux)

Aurélien Aptel <> writes:

> On Mon, Jul 22, 2013 at 4:12 PM, Thorsten Jolitz <> wrote:
>>> Since Emacs did not start the external process, it does not have
>>> access to its standard input stream -- unless your OS provides a way
>>> to do that (e.g. via a special /dev file).
>>> How would you communicate with the external process, from any other
>>> program?
>> I don't know, and I interpreted the responses so far to my post as "it
>> is impossible, only 'kill' can access the running external process with
>> given PID" - but kill sends signals, no command-strings or so.
> Kevin is right in that on Linux you can use /proc/$PID/fd/0 and 1 to
> access the file descriptor of the stdin and stdout of the program
> $PID. Actually, it's the input/output of the controlling terminal
> which means you have to use some tricks [1] to communicate with the
> process.

Which do you no good, if that process has closed fds 0, 1 and 2, as any
good daemon process would do.

__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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