linux-kernel - Re: [PATCH 0/7][v7] Container-init signal semantics

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Message-Id: <20090119110906.58ccbcbd.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Mon, 19 Jan 2009 11:09:06 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc:	oleg@...hat.com, ebiederm@...ssion.com, roland@...hat.com,
	bastian@...di.eu.org, daniel@...ac.com, xemul@...nvz.org,
	containers@...ts.osdl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/7][v7] Container-init signal semantics

On Sat, 17 Jan 2009 12:26:38 -0800
Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com> 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'm glad if you add some documentation updates about how-it-works to patch set.

Thanks,
-Kame


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