From owner-freebsd-net  Thu Jun  7  5:36:49 2001
Delivered-To: freebsd-net@freebsd.org
Received: from info.iet.unipi.it (info.iet.unipi.it [131.114.9.184])
	by hub.freebsd.org (Postfix) with ESMTP id 0905637B407
	for <freebsd-net@FreeBSD.ORG>; Thu,  7 Jun 2001 05:36:42 -0700 (PDT)
	(envelope-from luigi@info.iet.unipi.it)
Received: (from luigi@localhost)
	by info.iet.unipi.it (8.9.3/8.9.3) id OAA41296;
	Thu, 7 Jun 2001 14:32:41 +0200 (CEST)
	(envelope-from luigi)
From: Luigi Rizzo <luigi@info.iet.unipi.it>
Message-Id: <200106071232.OAA41296@info.iet.unipi.it>
Subject: Re: How to count frames transmitted through the ethernet card.
In-Reply-To: <3B1F67A8.2676289D@it.uc3m.es> from Juan Fco Rodriguez Hervella
 at "Jun 7, 2001 01:38:16 pm"
To: Juan Fco Rodriguez Hervella <jrh@it.uc3m.es>
Date: Thu, 7 Jun 2001 14:32:41 +0200 (CEST)
Cc: freebsd-net@FreeBSD.ORG
X-Mailer: ELM [version 2.4ME+ PL61 (25)]
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: owner-freebsd-net@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-net.FreeBSD.ORG>
List-Archive: <http://docs.freebsd.org/mail/> (Web Archive)
List-Help: <mailto:majordomo?subject=help> (List Instructions)
List-Subscribe: <mailto:majordomo?subject=subscribe%20freebsd-net>
List-Unsubscribe: <mailto:majordomo?subject=unsubscribe%20freebsd-net>
X-Loop: FreeBSD.org

> That is my problem, If sendto() *not* always returns ENOBUFS, I
> need to know the packets what are actually transmited...

you don't have a way to know. The transmission can fail in the device
driver (e.g. because of excessive collisions) and you only know it at a
later time.

	cheers
	luigi
> 
> >> Hello:
> >> 
> >> I am doing a program that sends udp packets. I have a counter
> >> and each time I send a packet with "sendto()", I increment the value
> >> of this variable.
> >> 
> >> But I would like to count the frames that are being actually
> >> transmitted, through the ethernet card, some like the ifconfig/netstat.
> >
> > In principle sendto() can return you an ENOBUFS error when the
> > interface queue is full, but not always (depending on how the
> > firewall plays with the packet).
> 
> >        cheers
> >        luigi
> 
> 
> *********************************
> Juan F. Rodriguez Hervella
> Universidad Carlos III de Madrid
> ********************************
> 
> To Unsubscribe: send mail to majordomo@FreeBSD.org
> with "unsubscribe freebsd-net" in the body of the message
> 


To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-net" in the body of the message