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

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Date:	Wed, 21 Jan 2009 21:48:31 -0800
From:	Matt Helsley <matthltc@...ibm.com>
To:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-kernel@...r.kernel.org, bastian@...di.eu.org,
	oleg@...hat.com, ebiederm@...ssion.com, containers@...ts.osdl.org,
	roland@...hat.com, xemul@...nvz.org,
	"Michael Kerrisk [manpages]" <mtk-manpages@....net>
Subject: Re: [PATCH 0/7][v7] Container-init signal semantics

On Tue, 2009-01-20 at 19:05 -0800, Sukadev Bhattiprolu wrote:
> KAMEZAWA Hiroyuki [kamezawa.hiroyu@...fujitsu.com] wrote:
> | 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 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. 

When it's accepted I wonder if it might also be good to contact the
manpages list too so they can update the kill/signal manpages.

Cheers,
	-Matt Helsley

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