Messages in this thread | | | Date | Fri, 31 Mar 2006 12:49:43 -0800 (PST) | From | Linus Torvalds <> | Subject | RE: [PATCH] splice support #2 |
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On Fri, 31 Mar 2006, Hua Zhong wrote: > > If I understand correctly: > > splice is one fd in, one fd out
Yes, and one of the fd's have to be a pipe.
> tee is one fd in, two fd out (and I'd assume the "one fd in" would always be > a pipe)
Actually, all three of them would have to be pipes. The tee() thing has to push to both sources in a "synchronized" manner, so it can't just take arbitrary file descriptors that it doesn't know the exact buffering rules for.
(Otherwise you wouldn't need "tee()" at all - you could have a "splice()" that just takes several output fd's).
> How about one fd in, N fd out? Do you then stack the tee calls using > temporary pipes?
I didn't write the tee() logic, but making it 1:N instead of 1:2 is not conceptually a problem at all. The exact system call interface might limit it some way, of course.
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