From: Bill Fink <billfink@mindspring•com>
To: Evgeniy Polyakov <zbr@ioremap•net>
Cc: bert hubert <bert.hubert@netherlabs•nl>,
"H. Willstrand" <h.willstrand@gmail•com>,
netdev@vger•kernel.org
Subject: Re: sendfile()? Re: SO_LINGER dead: I get an immediate RST on 2.6.24?
Date: Sun, 11 Jan 2009 23:50:01 -0500 [thread overview]
Message-ID: <20090111235001.536a858d.billfink@mindspring.com> (raw)
In-Reply-To: <20090111231859.GA8309@ioremap.net>
On Mon, 12 Jan 2009, Evgeniy Polyakov wrote:
> On Mon, Jan 12, 2009 at 12:08:24AM +0100, bert hubert (bert.hubert@netherlabs•nl) wrote:
> > I fully understand. Sometimes I have to talk to stupid devices though. What
> > I do find is the TCP_INFO ioctl, which offers this field in struct tcp_info:
> >
> > __u32 tcpi_unacked;
> >
> > Which comes from:
> >
> > struct tcp_sock {
> > ...
> > u32 packets_out; /* Packets which are "in flight" */
> > ...
> > }
> >
> > If this becomes 0, perhaps this might tell me everything I sent was acked?
>
> 0 means that there are noin-flight packets, which is effectively number
> of unacked packets. So if your application waits for this field to
> become zero, it will wait for all sent packets to be acked.
I use this type of strategy in nuttcp, and it seems to work fine.
I have a loop with a small delay and a check of tcpi_unacked, and
break out of the loop if tcpi_unacked becomes 0 or a defined timeout
period has passed.
-Bill
next prev parent reply other threads:[~2009-01-12 4:50 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-11 21:23 SO_LINGER dead: I get an immediate RST on 2.6.24? bert hubert
2009-01-11 22:08 ` H. Willstrand
2009-01-11 22:45 ` sendfile()? " bert hubert
2009-01-11 22:54 ` Evgeniy Polyakov
2009-01-11 23:08 ` bert hubert
2009-01-11 23:18 ` Evgeniy Polyakov
2009-01-12 4:50 ` Bill Fink [this message]
2009-01-12 9:18 ` Ilpo Järvinen
2009-01-13 5:31 ` Bill Fink
2009-02-13 17:02 ` Jeremy Jackson
2009-02-20 18:10 ` Bill Fink
-- strict thread matches above, loose matches on Subject: below --
2009-01-13 6:32 Herbert Xu
2009-01-13 6:56 ` Bill Fink
2009-01-13 7:01 ` Herbert Xu
2009-01-14 7:43 ` Bill Fink
2009-01-14 8:29 ` Herbert Xu
2009-01-14 9:05 ` Bill Fink
2009-01-14 11:30 ` Herbert Xu
2009-01-15 6:33 ` Bill Fink
2009-01-13 7:06 ` Rick Jones
2009-01-14 8:05 ` Bill Fink
2009-01-14 8:08 ` Rick Jones
2009-01-14 8:32 ` Bill Fink
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