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How to detect two emacs process in Elisp code?

From: stardiviner
Subject: How to detect two emacs process in Elisp code?
Date: Thu, 03 Sep 2020 02:33:50 -0000
User-agent: mu4e 1.5.5; emacs 28.0.50

I load desktop-save-mode session in init.el. But when using
"bug-hunter-init-file", I need to exclude this session init file.

Here is my try:

#+begin_src emacs-lisp
;;; detect external system has Emacs process running?
;;; If yes, like `bug-hunter' is running. Then don't load session.
(let ((emacs-processes
       (length (mapcar
                 (lambda (str)
                   (not (string-empty-p str)))
                  ;; (shell-command-to-string "ps -C emacs -o pid=")
                  (shell-command-to-string "ps -C emacs -o pid=")
  (when (<= emacs-processes 1)
    (message "init-emacs-session loading")
    (require 'init-emacs-session)))

The upper code has a problem, the command "ps -C emacs -o pid=" can't detect
emacs program name like "emacs-28.2.3" which is which is in /usr/local/bin and
compiled from source code.

Does anyone have good solution for this? Thanks in advance.

[ stardiviner ]
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