[debbugs-tracker] bug#31859: closed (26.1; Emacs has no way to determine if the current instance has a running server)

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Your message dated Sat, 23 Jun 2018 10:52:34 +0300
with message-id <address@hidden>
and subject line Re: bug#31859: 26.1; Emacs has no way to determine if the 
current instance has a running server
has caused the debbugs.gnu.org bug report #31859,
regarding 26.1; Emacs has no way to determine if the current instance has a 
running server
to be marked as done.

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31859: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=31859
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--- Begin Message --- 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 User-agent: mu4e 0.9.18; emacs 26.1

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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> --- Begin Message ---
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> Subject: 
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> Re: bug#31859: 26.1; Emacs has no way to determine if the current instance has a running server
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> Date: 
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> Sat, 23 Jun 2018 10:52:34 +0300
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> > Date: Sat, 16 Jun 2018 19:30:51 +0300
> > From: Eli Zaretskii <address@hidden>
> > Cc: address@hidden
> > 
> > > From: Thibault Polge <address@hidden>
> > > 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.
>
>
> --- End Message ---