linux-kernel - RE: which signal is sent to freeze process?

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Message-ID: <A3258B497F1C1441AD36A2E8B45FD6285508CB@scsmsx412.amr.corp.intel.com>
Date:	Wed, 18 Jul 2007 21:09:56 -0700
From:	"Agarwal, Lomesh" <lomesh.agarwal@...el.com>
To:	"Nigel Cunningham" <nigel@...el.suspend2.net>
Cc:	<linux-kernel@...r.kernel.org>
Subject: RE: which signal is sent to freeze process?

Can you point me to code where kernel captures process in signal
handling and code which runs after suspend to ram is finished?

-----Original Message-----
From: Nigel Cunningham [mailto:nigel@...el.suspend2.net] 
Sent: Wednesday, July 18, 2007 7:19 PM
To: Agarwal, Lomesh
Cc: linux-kernel@...r.kernel.org
Subject: Re: which signal is sent to freeze process?

Hi.

On Thursday 19 July 2007 09:42:02 Agarwal, Lomesh wrote:
> My understanding is that Linux kernel sends a signal to freeze
processes
> during suspend2ram operation. Which signal is used to achieve this?
> The problem I am facing is that some of the system calls are failing
> with EINTR errno during suspend operation and I want to install a
signal
> handler for freeze signal with SA_RESTART flag. That should make the
> kernel to retry the system calls. Right?

No signal is sent. We tell affected processes that they have a signal
pending, 
and capture them in the signal handling code while the suspend to ram is

occuring. After the suspend to ram is finished, we recalculate whether
they 
have a signal pending, and let them continue.

Not being a guru on signal handling itself, I won't try to answer the
question 
itself :\.

Regards,

Nigel
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