From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#17036: Continuation for Emacs: invoking a process on exit? Date: Wed, 19 Mar 2014 18:51:05 +0200 Message-ID: <8361na9lom.fsf@gnu.org> References: <874n2v9l10.fsf@igel.home> Reply-To: Eli Zaretskii NNTP-Posting-Host: plane.gmane.org X-Trace: ger.gmane.org 1395247929 19716 80.91.229.3 (19 Mar 2014 16:52:09 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 19 Mar 2014 16:52:09 +0000 (UTC) Cc: schwab@linux-m68k.org, 17036@debbugs.gnu.org To: Reuben Thomas Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Wed Mar 19 17:52:17 2014 Return-path: Envelope-to: geb-bug-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 1WQJiy-0000GO-Bu for geb-bug-gnu-emacs@m.gmane.org; Wed, 19 Mar 2014 17:52:16 +0100 Original-Received: from localhost ([::1]:42690 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WQJiy-0003rN-1U for geb-bug-gnu-emacs@m.gmane.org; Wed, 19 Mar 2014 12:52:16 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:34662) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WQJip-0003r6-Pl for bug-gnu-emacs@gnu.org; Wed, 19 Mar 2014 12:52:12 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WQJil-0000uu-5Y for bug-gnu-emacs@gnu.org; Wed, 19 Mar 2014 12:52:07 -0400 Original-Received: from debbugs.gnu.org ([140.186.70.43]:40224) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WQJil-0000up-1p for bug-gnu-emacs@gnu.org; Wed, 19 Mar 2014 12:52:03 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.80) (envelope-from ) id 1WQJik-0001bw-Ab for bug-gnu-emacs@gnu.org; Wed, 19 Mar 2014 12:52:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Wed, 19 Mar 2014 16:52:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 17036 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 17036-submit@debbugs.gnu.org id=B17036.13952478636096 (code B ref 17036); Wed, 19 Mar 2014 16:52:02 +0000 Original-Received: (at 17036) by debbugs.gnu.org; 19 Mar 2014 16:51:03 +0000 Original-Received: from localhost ([127.0.0.1]:41404 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WQJhl-0001Zy-Ep for submit@debbugs.gnu.org; Wed, 19 Mar 2014 12:51:02 -0400 Original-Received: from mtaout28.012.net.il ([80.179.55.184]:45702) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WQJhf-0001Zj-Tn for 17036@debbugs.gnu.org; Wed, 19 Mar 2014 12:50:58 -0400 Original-Received: from conversion-daemon.mtaout28.012.net.il by mtaout28.012.net.il (HyperSendmail v2007.08) id <0N2O00500ZWKAX00@mtaout28.012.net.il> for 17036@debbugs.gnu.org; Wed, 19 Mar 2014 18:50:50 +0200 (IST) Original-Received: from HOME-C4E4A596F7 ([87.69.4.28]) by mtaout28.012.net.il (HyperSendmail v2007.08) with ESMTPA id <0N2P00OJK04QOG60@mtaout28.012.net.il>; Wed, 19 Mar 2014 18:50:50 +0200 (IST) In-reply-to: X-012-Sender: halo1@inter.net.il X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 140.186.70.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:86977 Archived-At: > Date: Wed, 19 Mar 2014 13:19:28 +0000 > From: Reuben Thomas > Cc: Andreas Schwab , 17036@debbugs.gnu.org > > On 19 March 2014 13:10, Stefan wrote: > > > > I could imagine a `restart-emacs' command having some small utility. > > > > Could the w32 build support something like POSIX's `exec'? > > > Windows has execvp... http://msdn.microsoft.com/en-us/library/3xw6zy53.aspx Don't believe the sales people. MS's execvp is buggy, and even if we forget about those bugs, it won't do what is expected here: it won't keep the file descriptors open in the original process still open in the overlaid process. That's because there's no 'exec' system call on Windows, so execvp is _emulated_: the original process simply invokes the new one as its child process, and then immediately exits. So the answer to Stefan is: no, this cannot be done on Windows, not without some custom code to let the re-executed Emacs inherit all of the file descriptors which were open in the original Emacs process.