From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: ludo@gnu.org (Ludovic =?iso-8859-1?Q?Court=E8s?=) Newsgroups: gmane.lisp.guile.user Subject: Re: Trigger action at exit? Date: Mon, 03 Mar 2008 22:40:06 +0100 Message-ID: <87bq5v5vwp.fsf@gnu.org> References: <68dbb6fe0802291430g42240937u1241348a85021e73@mail.gmail.com> <87ve459gxb.fsf@gnu.org> <68dbb6fe0803031322t1dc981cn97e6c3b53c764aac@mail.gmail.com> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: ger.gmane.org 1204580433 16871 80.91.229.12 (3 Mar 2008 21:40:33 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Mon, 3 Mar 2008 21:40:33 +0000 (UTC) To: guile-user@gnu.org Original-X-From: guile-user-bounces+guile-user=m.gmane.org@gnu.org Mon Mar 03 22:40:59 2008 Return-path: Envelope-to: guile-user@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1JWIP2-0002b0-Rs for guile-user@m.gmane.org; Mon, 03 Mar 2008 22:40:57 +0100 Original-Received: from localhost ([127.0.0.1] helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1JWIOV-0001tk-JU for guile-user@m.gmane.org; Mon, 03 Mar 2008 16:40:23 -0500 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1JWIOQ-0001qM-IX for guile-user@gnu.org; Mon, 03 Mar 2008 16:40:18 -0500 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1JWIOP-0001ow-Li for guile-user@gnu.org; Mon, 03 Mar 2008 16:40:17 -0500 Original-Received: from [199.232.76.173] (helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1JWIOP-0001oi-Bz for guile-user@gnu.org; Mon, 03 Mar 2008 16:40:17 -0500 Original-Received: from main.gmane.org ([80.91.229.2] helo=ciao.gmane.org) by monty-python.gnu.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1JWIOO-0001xZ-Qc for guile-user@gnu.org; Mon, 03 Mar 2008 16:40:17 -0500 Original-Received: from list by ciao.gmane.org with local (Exim 4.43) id 1JWIOK-00073X-HA for guile-user@gnu.org; Mon, 03 Mar 2008 21:40:12 +0000 Original-Received: from reverse-83.fdn.fr ([80.67.176.83]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 03 Mar 2008 21:40:12 +0000 Original-Received: from ludo by reverse-83.fdn.fr with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 03 Mar 2008 21:40:12 +0000 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 52 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: reverse-83.fdn.fr X-Revolutionary-Date: 14 =?iso-8859-1?Q?Vent=F4se?= an 216 de la =?iso-8859-1?Q?R=E9volution?= X-PGP-Key-ID: 0xEB1F5364 X-PGP-Key: http://www.laas.fr/~lcourtes/ludovic.asc X-PGP-Fingerprint: 821D 815D 902A 7EAB 5CEE D120 7FBA 3D4F EB1F 5364 X-OS: i686-pc-linux-gnu User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.1 (gnu/linux) Cancel-Lock: sha1:zSl5l0yyI3PIooEAfpIr8rblQg4= X-detected-kernel: by monty-python.gnu.org: Linux 2.6, seldom 2.4 (older, 4) X-BeenThere: guile-user@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: General Guile related discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: guile-user-bounces+guile-user=m.gmane.org@gnu.org Errors-To: guile-user-bounces+guile-user=m.gmane.org@gnu.org Xref: news.gmane.org gmane.lisp.guile.user:6437 Archived-At: Hi, "John Trammell" writes: > (define (cleanup) > (simple-format #t "has-plan: ~a~%" has-plan) > (simple-format #t "1..~a~%" index)) > > (catch 'quit > (lambda () (exit 1)) > (lambda (key . args) > (begin (format #t "in handler~%") > (format #t "key:~a args:~a~%" key args) > (cleanup)))) > > (set! has-plan #t) > (format #t "fiddle dee dee~%") No, you would want to enclose the body of your code in `catch', i.e., (catch 'quit (lambda () ;; your code ...) (lambda (key . args) ...)) Anyway, this isn't good, because if your code doesn't call `exit', then the `quit' exception is never raised. `dynamic-wind' provides a better solution, since the "handler" is called whenever the dynamic extent of the body is left: (dynamic-wind (lambda () ;; nothing to do here #t) (lambda () ;; the code body ;; ... ) (lambda () ;; the "exit guard" or "handler", which gets called whenever the ;; body's extent is left, including via an `exit' call )) If your code uses C code that may exit in other ways (e.g., C code that calls `exit(3)' or similar), then you need an `atexit' similar to what Neil described. Thanks, Ludovic.