linux-kernel - Re: [PATCH 2/3] signalfd: add ability to return siginfo in a raw format (v2)

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Message-ID: <20130112185524.GA26170@redhat.com>
Date:	Sat, 12 Jan 2013 19:55:24 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrey Wagin <avagin@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, criu@...nvz.org,
	linux-fsdevel@...r.kernel.org, linux-api@...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 2/3] signalfd: add ability to return siginfo in a raw
	format (v2)

On 01/10, Andrey Wagin wrote:
>
> 2012/12/28 Oleg Nesterov <oleg@...hat.com>:
> >>
> >> This functionality is required for checkpointing pending signals.
> >
> > And this should be used along with pread().
> >
> > I won't argue, but perhaps we should simply postulate that pread()
> > always dumps siginfo in raw format and avoid the new flag?
>
> I won't argue too:), but I think the flag is more flexiable. The flag
> allows to get raw siginfo from read(), it may be useful not only for
> checkpoint/restore. pread with offset = 0 is equal to read(), so the
> interface with the flag is more clear.

OK, I agree.

Oleg.

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