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

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Message-ID: <20121225152716.GA3198@redhat.com>
Date:	Tue, 25 Dec 2012 16:27:16 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrey Wagin <avagin@...il.com>
Cc:	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>,
	Pavel Emelyanov <xemul@...allels.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>
Subject: Re: [PATCH 1/4] signalfd: add ability to return siginfo in a raw
	format

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.

Oleg.

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