From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Barry Margolin Newsgroups: gmane.emacs.help Subject: Re: hijack C function, use it transparently with in-between layer Date: Mon, 06 Jun 2016 10:40:48 -0400 Organization: A noiseless patient Spider Message-ID: References: <868tyjnghn.fsf@student.uu.se> NNTP-Posting-Host: plane.gmane.org X-Trace: ger.gmane.org 1465224366 1184 80.91.229.3 (6 Jun 2016 14:46:06 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Mon, 6 Jun 2016 14:46:06 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Mon Jun 06 16:46:05 2016 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1b9vn0-0003H8-QA for geh-help-gnu-emacs@m.gmane.org; Mon, 06 Jun 2016 16:46:02 +0200 Original-Received: from localhost ([::1]:42896 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1b9vmz-0005wL-T7 for geh-help-gnu-emacs@m.gmane.org; Mon, 06 Jun 2016 10:46:01 -0400 Original-Path: usenet.stanford.edu!news.tele.dk!news.tele.dk!small.news.tele.dk!newsfeed.xs4all.nl!newsfeed8.news.xs4all.nl!feeds.phibee-telecom.net!eternal-september.org!feeder.eternal-september.org!mx02.eternal-september.org!barmar.motzarella.org!.POSTED!not-for-mail Original-Newsgroups: gnu.emacs.help Original-Lines: 42 Injection-Info: barmar.motzarella.org; posting-host="2be9e9f5dd9af768b8861af71b85fc28"; logging-data="9707"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18pg23rMJjS+fZMge0nTxXY" User-Agent: MT-NewsWatcher/3.5.3b3 (Intel Mac OS X) Cancel-Lock: sha1:8NskRw1qVScx4kpS1VIbAYF5qKM= Original-Xref: usenet.stanford.edu gnu.emacs.help:218028 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.21 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.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.org gmane.emacs.help:110336 Archived-At: In article , phillip.lord@russet.org.uk (Phillip Lord) wrote: > Barry Margolin writes: > > > In article <868tyjnghn.fsf@student.uu.se>, > > Emanuel Berg wrote: > > > >> The truth is down there! > >> > >> (defvar old-message) > >> (fset 'old-message (symbol-function #'message)) > >> > >> (defun message (format-string &rest args) > >> (unless (member format-string > >> '( > >> "It was just another system of control." > >> "Mark set" > >> )) > >> (apply `(old-message ,format-string ,@args) ))) > >> > >> ;; test: > >> ;; > >> ;; (message "%s - %s" "1" "2") > >> ;; (message "Break on thru to the other side.") > >> ;; (message "It was just another system of control.") > >> ;; (message "Mark set") > > > > Shouldn't you do this using advice? > > > Advice only works partially (as I expect this will). The message > function is also called directly in the C layer. Advice will not capture > those cases. The same is true for redefining it as above. Nothing you do in Emacs Lisp will affect what happens for C-to-C calls. -- Barry Margolin, barmar@alum.mit.edu Arlington, MA *** PLEASE post questions in newsgroups, not directly to me ***