Re: emacs --daemon should provide a way to get its process id

[bwoster]

Ulrich Mueller-2 wrote:
> 
> by OpenRC's "start-stop-daemon"). What seems to be missing is an easy
> way to get the process id of the daemon.
> Most other programs running as a daemon save their process id in a
> file, typically located under /var/run.
> ...
> Any opinions about attached patch which adds a "--pidfile" option?
> ...
> Ulrich
> 

I'm all for it! I've just spent an hour trying to test out an init.d script,
but it is not very robust without a pidfile, so your patch would make things
so much easier...

Emacs does have the (emacs-pid) lisp function, but that too is not easy to
try, and there may be race conditions when two --daemons are started.

Actually... with your patch, if two emacs --daemon --pidfile=same_file are
started, what will happen?

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