From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Emanuel Berg via Users list for the GNU Emacs text editor Newsgroups: gmane.emacs.help Subject: Re: How to detect two emacs process in Elisp code? Date: Fri, 04 Sep 2020 06:28:27 +0200 Message-ID: <87363yb1xw.fsf@ebih.ebihd> References: <87ft9s283t.fsf@gmail.com> <83lfhruhnz.fsf@gnu.org> <87pn72bvzt.fsf@ebih.ebihd> <5f51bece.1c69fb81.e6e79.9840@mx.google.com> Reply-To: Emanuel Berg Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="31709"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:zTCtDBs0Ad/prv7mlE7E1N7Ud/Y= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Fri Sep 04 06:28:57 2020 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1kE3LM-00086i-TD for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 04 Sep 2020 06:28:56 +0200 Original-Received: from localhost ([::1]:53338 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kE3LL-0004gn-VF for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 04 Sep 2020 00:28:55 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:32930) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kE3L4-0004gf-2b for help-gnu-emacs@gnu.org; Fri, 04 Sep 2020 00:28:38 -0400 Original-Received: from static.214.254.202.116.clients.your-server.de ([116.202.254.214]:34840 helo=ciao.gmane.io) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kE3L1-0001H0-Lc for help-gnu-emacs@gnu.org; Fri, 04 Sep 2020 00:28:37 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1kE3Ky-0007a5-Ob for help-gnu-emacs@gnu.org; Fri, 04 Sep 2020 06:28:32 +0200 X-Injected-Via-Gmane: http://gmane.org/ Mail-Followup-To: help-gnu-emacs@gnu.org Mail-Copies-To: never Received-SPF: pass client-ip=116.202.254.214; envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/03 23:25:47 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:123951 Archived-At: stardiviner 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 >> >> ? > > This does not work perfectly, when I have Emacs > running, then start "emacs -q" from new command. > The upper `(list-system-processes)` solution get > result "1" instead of "2". Maybe somewhere > is wrong? Yes, don't use -q :) Fix it by replacing "emacs" above with something more intelligent... Or use the Unix version :) Simpler. -- underground experts united http://user.it.uu.se/~embe8573 https://dataswamp.org/~incal