netdev - sendfile()? Re: SO_LINGER dead: I get an immediate RST on 2.6.24?

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Message-ID: <20090111224541.GA10848@outpost.ds9a.nl>
Date:	Sun, 11 Jan 2009 23:45:43 +0100
From:	bert hubert <bert.hubert@...herlabs.nl>
To:	"H. Willstrand" <h.willstrand@...il.com>
Cc:	netdev@...r.kernel.org
Subject: sendfile()? Re: SO_LINGER dead: I get an immediate RST on 2.6.24?

On Sun, Jan 11, 2009 at 11:08:16PM +0100, H. Willstrand wrote:
> > Is SO_LINGER a NOOP? Does it still do anything?
> This is the correct behavior according to RFC 2525, see section 2.17
> (there are an example).

Ah - very good, thank you. I'm trying to gather as much information as I can
before writing this all up. This should save netdev & the linux kernel
community a lot of email!

Is there any way to make sure there is no pending output data, so one can
safely call close(), and not get an RST-situation? 

Let me put it more succinctly. What I would very much like to have is what
Linux sendfile() offers in practice.

It appears that if one asks sendfile() to transmit a million bytes, it will
only return when the ACK for the millionth byte is in.

I know that TCP will never be fully fully reliable, but I would love to have
a way to know that the millionth byte was ACKed, or alternatively, that an
error prevented that.

>From what I've read so far, I think the POSIX functions don't offer this.
But does Linux? sendfile appears to get it right..

Thanks.

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