netdev - Re: Splice on blocking TCP sockets again..

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Message-ID: <20090930054031.GY22310@obsidianresearch.com>
Date:	Tue, 29 Sep 2009 23:40:31 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	Volker Lendecke <vl@...ba.org>
Subject: Re: Splice on blocking TCP sockets again..

> One way to handle this is to switch tcp_read() to use the underlying file O_NONBLOCK
> flag, as other socket operations do. And let SPLICE_F_NONBLOCK control the pipe output only.

Thanks Eric, this seems reasonable from my userspace perspective.

I admit I don't understand why SPLICE_F_NONBLOCK exists, it seems very
un-unixy to have a syscall completely ignore the NONBLOCK flag of the
fd it is called on. Ie setting NONBLOCK on the pipe itself does
nothing when using splice..

Jason
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