linux-kernel - Re: [RFC][PATCH 1/5] signals: Always place SIGCONT and SIGSTOP on 'shared

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Date:	Wed, 6 Apr 2011 14:15:48 +0100
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"H. Peter Anvin" <hpa@...or.com>,
	Matt Fleming <matt.fleming@...ux.intel.com>
Subject: Re: [RFC][PATCH 1/5] signals: Always place SIGCONT and SIGSTOP on
 'shared_pending'

On Wed, 6 Apr 2011 14:57:57 +0200
Oleg Nesterov <oleg@...hat.com> wrote:
 
> Argh, sorry, I was not clear.
> 
> First of all, only SIGSTOP is never delivered to user-space, other
> sig_kernel_stop() signals can have a handler and in this case, say,
> SIGTTIN doesn't stop but acts like the normal signal. This means you
> can't put it into shared_pending.

Yeah, good point. This patch definitely needs dropping from the series.

> But even SIGSTOP should be routed properly. If the process is ptraced,
> the tracee reports SIGSTOP to the debugger first. This means that
> tkill(SIGSTOP) should be delivered to the right target.

Right, thanks.

-- 
Matt Fleming, Intel Open Source Technology Center
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