Re: How to detect two emacs process in Elisp code?

[Emanuel Berg via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>]

Eli Zaretskii wrote:

>> (let ((emacs-processes
>>        (length (mapcar
>>                 'string-to-number
>>                 (seq-filter
>>                  (lambda (str)
>>                    (not (string-empty-p str)))
>>                  (split-string
>>                   ;; (shell-command-to-string "ps -C emacs -o pid=")
>>                   (shell-command-to-string "ps -C emacs -o pid=")
>>                   "\n"))))))
>>   (when (<= emacs-processes 1)
>>     (message "init-emacs-session loading")
>>     (require 'init-emacs-session)))
>
> Why do you need to use an external command ('ps')?
> What's wrong with using list-system-processes and
> process-attributes instead?

Uhm... like this:

(defun count-emacs ()
  (let ((eps 0))
    (cl-loop for pid in (list-system-processes)
             when (string= (cdar (process-attributes pid)) "emacs")
             do (cl-incf eps) )
    eps) )
;; (count-emacs) ; 1

?

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