From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sukadev Bhattiprolu Subject: Re: [PATCH 0/7][v7] Container-init signal semantics Date: Tue, 20 Jan 2009 19:05:00 -0800 Message-ID: <20090121030500.GA32138@us.ibm.com> References: <20090117202638.GA11825@us.ibm.com> <20090119110906.58ccbcbd.kamezawa.hiroyu@jp.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20090119110906.58ccbcbd.kamezawa.hiroyu@jp.fujitsu.com> Sender: linux-kernel-owner@vger.kernel.org To: KAMEZAWA Hiroyuki Cc: oleg@redhat.com, ebiederm@xmission.com, roland@redhat.com, bastian@waldi.eu.org, daniel@hozac.com, xemul@openvz.org, containers@lists.osdl.org, linux-kernel@vger.kernel.org List-Id: containers.vger.kernel.org KAMEZAWA Hiroyuki [kamezawa.hiroyu@jp.fujitsu.com] wrote: | On Sat, 17 Jan 2009 12:26:38 -0800 | Sukadev Bhattiprolu wrote: | | > | > Container-init must behave like global-init to processes within the | > container and hence it must be immune to unhandled fatal signals from | > within the container (i.e SIG_DFL signals that terminate the process). | > | > But the same container-init must behave like a normal process to | > processes in ancestor namespaces and so if it receives the same fatal | > signal from a process in ancestor namespace, the signal must be | > processed. | > | > Implementing these semantics requires that send_signal() determine pid | > namespace of the sender but since signals can originate from workqueues/ | > interrupt-handlers, determining pid namespace of sender may not always | > be possible or safe. | > | | Is this feature is for blocking signals from children to name-space | creator(owner) ? And automatically used when namespace/cgroup is created ? | IOW, Container-init is Namespace-Cgroup-init ? I am not sure what "Namespace-cgroup-init refers" to. But, yes, this patchset applies to the first process in a pid namespace i.e the child of clone(NEWPID) call. | | I'm glad if you add some documentation updates about how-it-works to patch set. Yes, when the patchset is accepted, I am planning to add some notes to /sbin/init man page. Thanks, Sukadev