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Message-ID: <20121226144751.GA18767@paralelels.com> Date: Wed, 26 Dec 2012 18:47:51 +0400 From: Andrew Vagin <avagin@...allels.com> To: Oleg Nesterov <oleg@...hat.com> CC: Pavel Emelyanov <xemul@...allels.com>, David Howells <dhowells@...hat.com>, <linux-kernel@...r.kernel.org>, <criu@...nvz.org>, Cyrill Gorcunov <gorcunov@...nvz.org>, Andrey Wagin <avagin@...il.com>, Alexander Viro <viro@...iv.linux.org.uk>, <linux-fsdevel@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Michael Kerrisk <mtk.manpages@...il.com> Subject: Re: [CRIU] [PATCH 1/4] signalfd: add ability to return siginfo in a raw format On Tue, Dec 25, 2012 at 05:58:03PM +0100, Oleg Nesterov wrote: > On 12/25, Pavel Emelyanov wrote: > > > > On 12/25/2012 07:27 PM, Oleg Nesterov wrote: > > > > > > 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. > > nr-of-records looks better (more flexible) than nr-of-bytes to me. And > perhaps we can also encode private-or-shared into ppos. But I will not > argue in any case. Oleg and Pavel, could you look at these two patches. I implemented in them, what you described here. > > Oleg. > > _______________________________________________ > CRIU mailing list > CRIU@...nvz.org > http://lists.openvz.org/mailman/listinfo/criu View attachment "0001-signal-add-helper-to-get-siginfo-without-removing-fr.patch" of type "text/plain" (1944 bytes) View attachment "0002-signalfd-add-ability-to-get-signal-without-removing-.patch" of type "text/plain" (3411 bytes)
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