From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier via Users list for the GNU Emacs text editor Newsgroups: gmane.emacs.help Subject: Re: unwind-protect and inhibit-quit Date: Fri, 16 Jul 2021 11:00:14 -0400 Message-ID: References: <875yxbr4lr.fsf@sperrhaken.name> <83eeby680s.fsf@gnu.org> Reply-To: Stefan Monnier Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="37246"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:GIi3XvtVlfsEhjchz8BVx+iBLyQ= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Fri Jul 16 17:01:44 2021 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 1m4PLU-0009cD-MK for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 16 Jul 2021 17:01:44 +0200 Original-Received: from localhost ([::1]:39990 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m4PLT-0003R9-Mh for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 16 Jul 2021 11:01:43 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:57898) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m4PKE-0002cs-Cx for help-gnu-emacs@gnu.org; Fri, 16 Jul 2021 11:00:26 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:51542) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m4PKA-0002Px-Dm for help-gnu-emacs@gnu.org; Fri, 16 Jul 2021 11:00:25 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1m4PK7-00089L-CL for help-gnu-emacs@gnu.org; Fri, 16 Jul 2021 17:00:19 +0200 X-Injected-Via-Gmane: http://gmane.org/ Received-SPF: pass client-ip=116.202.254.214; envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no 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:131755 Archived-At: > Now I'm curious too... Would something like this work? > > (let ((inhibit-quit t)) > (setq process > (let ((inhibit-quit nil)) > (ftp-setup-buffer host file)))) No. The problem is not in the `setq` itself but in the fact that a non-local exit from `ftp-setup-buffer` (e.g. because of `C-g`) will cause `ftp-setup-buffer` not to return the process. We should devise a more reliable API, tho I'm not completely sure what it should look like. Maybe (let ((list-of-created-processes nil)) (unwind-protect ... (mapc #'delete-process list-of-created-processes))) Where the low-level primitives which create processes add them to `list-of-created-processes`. But then this gets into trouble when some unrelated code is run during `...` (e.g. via timers or whatnot) which creates unrelated processes, so we'd need some extra care to make sure those processes don't get added to "the same" `list-of-created-processes`. Stefan