linux-kernel - Re: [splice PATCH 3/3] splice: added support for pipe-to-pipe splice()

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Message-ID: <20090430135016.GA26868@squirrel.roonstrasse.net>
Date:	Thu, 30 Apr 2009 15:50:16 +0200
From:	Max Kellermann <max@...mpel.org>
To:	Vegard Nossum <vegard.nossum@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [splice PATCH 3/3] splice: added support for pipe-to-pipe
	splice()

On 2009/04/30 15:35, Vegard Nossum <vegard.nossum@...il.com> wrote:
> What happens if you splice two pipes, in separate threads, to each
> other? :-)

As a demonstration, here's an experiment with older technology, when
pipes were still made of wood (pre-splice):

 mkfifo /tmp/foo
 cat /tmp/foo >/tmp/foo

You may launch the real thing now with a simple

 echo Hello World >tmp/foo

Warning: with only one pipe, you're likely to bend the pipe too far,
and it may break (SIGPIPE).

Max
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