From owner-freebsd-hackers@FreeBSD.ORG  Fri May 25 08:41:33 2007
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Date: Fri, 25 May 2007 17:14:42 +0900
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From: Weongyo Jeong <weongyo.jeong@gmail.com>
Subject: A sendfile(2) extension module.
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Hello.

I have written a simple sendfile(2) extension module which supports a transfer from a stream socket to a stream socket.

For details, you can check the below URL:
http://weongyo.org/project/freebsd/sendsock/

I don't know that it is useful but I think that it is helpful when you have a plan to make a proxy.