Re: server-start preempted by other emacs window

[Thorsten Bonow]

>>>>> "Stefan" == Stefan Monnier <monnier@iro.umontreal.ca> writes:

    >> Is there a way to have emacs check to see if another server
    >> process is running before it runs server-start?

    Stefan> Not really.  It's pretty tricky to do.  One way is to see
    Stefan> if the socket file is present in /tmp.  But then it might
    Stefan> be left over from a previous Emacs that's not running any
    Stefan> more.  You could try and make sure that Emacs removes the
    Stefan> socket file when it exits, but if it crashes, you're still
    Stefan> left with a dead socket in /tmp.  A more robust way is to
    Stefan> check whether you can connect to the socket.  In Emacs-CVS
    Stefan> you could do that with make-network-stream.

    Stefan> [...]

    Stefan>         Stefan

Hi, this was discussed before. I could not find the thread, but since
then I have this solution in my .emacs to prevent starting a second
server if one is already running:

--- cut here ---
;; ** emacsclient
(defun my-server-start-filter-function (process output)
  "Filter function for `my-server-start', which checks for an
accessible Emacs process acting as a server by calling
`emacsclient --eval t' as an external asynchronous
process. Process output is filtered by this function which only
calls `server-start' when no server is running, id est the call
to emacsclient has failed."
  (if (equal output "t\n")
      (message "Not starting server, one instance already running...")
    (message "Starting server...")
      (server-start)))
;;
(defun my-server-start ()
  "Call `server-start' only if no other accessible Emacs process
is already acting as a server for client processes."
  (let ((process-connection-type nil))
    (set-process-filter (start-process "my-process" nil "emacsclient" "--eval" 
"t")
                        'my-server-start-filter-function)))
;;
(my-server-start)
--- cut here ---

Toto

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