GNU bug report logs - #31859
26.1; Emacs has no way to determine if the current instance has a running server

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Thibault <thibault <at> thb.lt>
Subject: bug#31859: closed (Re: bug#31859: 26.1; Emacs has no way to
 determine if the current instance has a running server)
Date: Sat, 23 Jun 2018 07:53:01 +0000

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Your bug report

#31859: 26.1; Emacs has no way to determine if the current instance has a running server

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 31859 <at> debbugs.gnu.org.

-- 
31859: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=31859
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Eli Zaretskii <eliz <at> gnu.org>
To: thibault <at> thb.lt
Cc: 31859-done <at> debbugs.gnu.org
Subject: Re: bug#31859: 26.1;
 Emacs has no way to determine if the current instance has a running
 server
Date: Sat, 23 Jun 2018 10:52:34 +0300

> Date: Sat, 16 Jun 2018 19:30:51 +0300
> From: Eli Zaretskii <eliz <at> gnu.org>
> Cc: 31859 <at> debbugs.gnu.org
> 
> > From: Thibault Polge <thibault <at> thb.lt>
> > Date: Sat, 16 Jun 2018 18:27:03 +0200
> > 
> > > Does it work to test whether server-process is bound and non-nil?
> > 
> > It works, indeed.  Would you accept a documentation PR on the variable
> > and the two functions, which are much more obvious candidates?
> > Something like:
> > 
> > For a general way of determining if the current instance has a server
> > running, check the value of `server-process`.
> > 
> > Or a PR adding a stupid helper function like:
> 
> I'd prefer a documentation change, but let's see if someone has other
> opinions.

No further comments, so I installed a documentation change, and I'm
marking this bug done.

Thanks.

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From: Thibault <thibault <at> thb.lt>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.1;
 Emacs has no way to determine if the current instance has a running
 server
Date: Sat, 16 Jun 2018 18:04:19 +0200

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It's all in the subject line: Emacs has no way to determine if the
current instance has a running server.  There's the `server-mode'
variable along with the `daemonp' and `server-running-p' functions, but
none of them are actually usable for the most elementary use case of
determining whether *this* instance has a server started.

 - `server-mode' is nil if the server was started with `M-x server-start',
   and t only if was started with `server-mode'

 - `(daemonp)' returns non-nil if and only if emacs was started as a
   daemon.

That is, the following sexp:

(progn
    (require 'server)
    (server-start)
    (or server-mode (daemonp)))

will always evaluate to nil, except from emacsclient.

 - (server-running-p) tries to determine if /some/ server is running,
   somewhere, that is configured like the current server would be, but
   it doesn't guarantee that the server runs from the current instance.
   If you start two instances, `(server-running-p)' will eval to `t' *in
   both* after the server was started in any one of them.

Thanks,
Thibault

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