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From: "Hua Zhong" <hzhong@gmail.com>
To: "'Linus Torvalds'" <torvalds@osdl.org>, "'Jens Axboe'" <axboe@suse.de>
Cc: "'Ingo Molnar'" <mingo@elte.hu>, <linux-kernel@vger.kernel.org>,
       <akpm@osdl.org>
Subject: RE: [PATCH] splice support #2
Date: Fri, 31 Mar 2006 12:38:52 -0800
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Hi Linus,

> The 4th reason is "tee". Again, you _could_ perhaps do "tee" 
> without the pipe, but it would be a total nightmare. Now, tee 
> isn't that common, but it does happen, and in particular it 
> happens a lot with certain streaming content.

If I understand correctly:

splice is one fd in, one fd out
tee is one fd in, two fd out (and I'd assume the "one fd in" would always be
a pipe)

How about one fd in, N fd out? Do you then stack the tee calls using
temporary pipes?

i.e., if N=3, then we'd have:

pipe(fd_tmp_pipe);
tee(fd_in, fd_out1, fd_tmp_pipe[0];
tee(fd_tmp_pipe[1], fd_out2, fd_out3);

Basically, N-2 temporary pipes would be required.

Is this the intention?

Hua


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