From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.devel Subject: Re: Starting a subprocess in stopped state Date: Sun, 07 May 2017 20:16:38 +0300 Message-ID: <838tm8egeh.fsf@gnu.org> References: <831ss7hyh0.fsf@gnu.org> <83tw4zg3rj.fsf@gnu.org> <87bmr6wngl.fsf@zigzag> <83bmr6fmch.fsf@gnu.org> Reply-To: Eli Zaretskii NNTP-Posting-Host: blaine.gmane.org X-Trace: blaine.gmane.org 1494177436 19035 195.159.176.226 (7 May 2017 17:17:16 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Sun, 7 May 2017 17:17:16 +0000 (UTC) Cc: ueno@gnu.org, emacs-devel@gnu.org To: Philipp Stephani Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Sun May 07 19:17:12 2017 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1d7Pnx-0004kz-H4 for ged-emacs-devel@m.gmane.org; Sun, 07 May 2017 19:17:09 +0200 Original-Received: from localhost ([::1]:56239 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d7Po1-0004l1-Bk for ged-emacs-devel@m.gmane.org; Sun, 07 May 2017 13:17:13 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:45612) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d7Pnu-0004bk-Bt for emacs-devel@gnu.org; Sun, 07 May 2017 13:17:07 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1d7Pnt-0004jV-CP for emacs-devel@gnu.org; Sun, 07 May 2017 13:17:06 -0400 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:39373) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d7Pnm-0004iG-Ku; Sun, 07 May 2017 13:16:58 -0400 Original-Received: from 84.94.185.246.cable.012.net.il ([84.94.185.246]:4371 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1d7Pnl-0003oy-TK; Sun, 07 May 2017 13:16:58 -0400 In-reply-to: (message from Philipp Stephani on Sun, 07 May 2017 12:24:33 +0000) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 2001:4830:134:3::e X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.org gmane.emacs.devel:214679 Archived-At: > From: Philipp Stephani > Date: Sun, 07 May 2017 12:24:33 +0000 > Cc: Daiki Ueno > > Is there a way to create a process on Unix and GNU systems, but > prevent it from running until it gets SIGCONT or something similar? > > It's at least theoretically possible on macOS using posix_spawn(3) and > POSIX_SPAWN_START_SUSPENDED > (https://developer.apple.com/legacy/library/documentation/Darwin/Reference/ManPages/man3/posix_spawnattr_setflags.3.html). > I don't think it's possible using fork/exec (but then, switching to posix_spawn might be a good idea anyway). Thanks. However, since this an Apple extension, I don't think we can use it unless there's an equivalent feature on other Unix and GNU systems.