Messages in this thread | | | Date | Thu, 30 Apr 2009 08:21:51 +0200 | From | Jens Axboe <> | Subject | Re: splice() on two pipes |
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On Wed, Apr 29 2009, Max Kellermann wrote: > Hi, > > when I read about the splice() system call, I thought it was obvious > that it could copy data between two pipes. I was surprised that this > assumption is wrong, it's not possible on 2.6.29, I get EINVAL. Can > anybody please explain this limitation? > > Background: I want to forward data between two subprocesses, which are > connected to me with a pipe(). > > I have attached a small test program which prints a table of supported > splice operations. Here's the output on 2.6.29.1: > > in\out pipe sock reg chr > pipe no yes yes yes > sock no no no no > reg yes no no no > chr no no no no
See sys_tee().
-- Jens Axboe
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