linux-kernel - Re: [PATCH 7/7][v7] proc: Show SIG_DFL signals to init as "ignored" signals

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Message-ID: <20090120010453.GA14612@us.ibm.com>
Date:	Mon, 19 Jan 2009 17:04:53 -0800
From:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	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 7/7][v7] proc: Show SIG_DFL signals to init as
	"ignored" signals

Oleg Nesterov [oleg@...hat.com] wrote:
| On 01/17, Sukadev Bhattiprolu wrote:
| >
| > Init processes ignore SIG_DFL signals unless they are from an ancestor
| > namespace.  Ensure /proc/pid/status correcly reports these signals.
| 
| This is the user-visible change, and I don't really understand why do we
| need it.

This discussion came up earlier, with Bastian and Roland and my understanding
was that we should fix the SigIgn line in /proc/pid/status - so I had added
a TODO for this patchset.

| 
| Imho, this patch can confuse the user-space. Why should we report that,
| say, SIGCONT is ignored by the global init?

But it is ignored right ?

Also, if user space looks at the SigIgn line and assumes that SIGKILL or
SIGUSR1 will kill init, user space can still be confused when it doesn't
really kill - no ?

| 
| 
| Even if I am wrong, I believe this change is orthogonal to rhis series,
| and should be posted separately.
| 

You are right that its not strictly tied to this patchset. init was
dropping SIGKILL before too.

So, should I just post separately or drop altogether ?

Sukadev
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