linux-kernel - Re: [PATCH 1/4] signalfd: add ability to return siginfo in a raw format

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Date:	Tue, 25 Dec 2012 19:40:25 +0400
From:	Pavel Emelyanov <xemul@...allels.com>
To:	Oleg Nesterov <oleg@...hat.com>
CC:	Andrey Wagin <avagin@...il.com>, linux-kernel@...r.kernel.org,
	criu@...nvz.org, linux-fsdevel@...r.kernel.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	David Howells <dhowells@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>
Subject: Re: [PATCH 1/4] signalfd: add ability to return siginfo in a raw
 format

On 12/25/2012 07:27 PM, Oleg Nesterov wrote:
> On 12/25, Oleg Nesterov wrote:
>>
>> And if we add another format we should think
>> twice.
> 
> And btw this applies to the whole series.
> 
> I guess that probably you actually need DUMP, not DEQUEUE. but the
> latter is not trivial. However, perhaps we can do this assuming that
> all other threads are sleeping and nobody can do dequeue_signal().
> Say, we can play with ppos/llseek. If *ppos is not zero,
> signalfd_dequeue() could dump the nth entry from list or return 0.

This would be perfect, but isn't it better to preserve the pos
semantics -- we do know size of entry we're about to copy, we can
treat pos as offset in bytes, not in elements.

> Oleg.
> 
> .
> 


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