From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AD2ADC43219 for ; Tue, 30 Apr 2019 12:39:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7F57A2173E for ; Tue, 30 Apr 2019 12:39:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728312AbfD3MjM (ORCPT ); Tue, 30 Apr 2019 08:39:12 -0400 Received: from mx1.redhat.com ([209.132.183.28]:39766 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727469AbfD3MjL (ORCPT ); Tue, 30 Apr 2019 08:39:11 -0400 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id C16833091786; Tue, 30 Apr 2019 12:39:10 +0000 (UTC) Received: from dhcp-27-174.brq.redhat.com (unknown [10.43.17.159]) by smtp.corp.redhat.com (Postfix) with SMTP id 7C2301001E91; Tue, 30 Apr 2019 12:39:04 +0000 (UTC) Received: by dhcp-27-174.brq.redhat.com (nbSMTP-1.00) for uid 1000 oleg@redhat.com; Tue, 30 Apr 2019 14:39:08 +0200 (CEST) Date: Tue, 30 Apr 2019 14:39:01 +0200 From: Oleg Nesterov To: Linus Torvalds Cc: Jann Horn , Kevin Easton , Andy Lutomirski , Christian Brauner , Aleksa Sarai , "Enrico Weigelt, metux IT consult" , Al Viro , David Howells , Linux API , LKML , "Serge E. Hallyn" , Arnd Bergmann , "Eric W. Biederman" , Kees Cook , Thomas Gleixner , Michael Kerrisk , Andrew Morton , Joel Fernandes , Daniel Colascione Subject: Re: RFC: on adding new CLONE_* flags [WAS Re: [PATCH 0/4] clone: add CLONE_PIDFD] Message-ID: <20190430123901.GD23020@redhat.com> References: <20190414201436.19502-1-christian@brauner.io> <20190415195911.z7b7miwsj67ha54y@yavin> <20190420071406.GA22257@ip-172-31-15-78> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.24 (2015-08-30) X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.41]); Tue, 30 Apr 2019 12:39:11 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 04/29, Linus Torvalds wrote: > > Linux vfork() is very much a real vfork(). What do you mean? Yes, but I am wondering if man vfork should clarify what "child terminates" actually means. I mean, the child can do clone(CLONE_THREAD) + sys_exit(), this will wake the parent thread up before the child process exits or execs. I see nothing wrong, but I was always curious whether it was designed this way on purpose or not. Oleg.