From owner-freebsd-net@freebsd.org  Fri Jan  1 11:42:56 2016
Return-Path: <owner-freebsd-net@freebsd.org>
Delivered-To: freebsd-net@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id E5126A54177
 for <freebsd-net@mailman.ysv.freebsd.org>;
 Fri,  1 Jan 2016 11:42:56 +0000 (UTC)
 (envelope-from h.rezaee@ideatech.io)
Received: from mail.ideatech.io (mail.ideatech.io [104.131.120.36])
 by mx1.freebsd.org (Postfix) with ESMTP id C19551118
 for <freebsd-net@freebsd.org>; Fri,  1 Jan 2016 11:42:56 +0000 (UTC)
 (envelope-from h.rezaee@ideatech.io)
Received: from hadi-pc.my.domain (unknown [83.121.0.83])
 by mail.ideatech.io (Postfix) with ESMTPSA id 2AD21112815
 for <freebsd-net@freebsd.org>; Fri,  1 Jan 2016 06:33:47 -0500 (EST)
To: freebsd-net@freebsd.org
From: Hadi Rezaee <h.rezaee@ideatech.io>
Subject: pcap and processing packets
X-Enigmail-Draft-Status: N1110
Message-ID: <56866415.6080303@ideatech.io>
Date: Fri, 1 Jan 2016 15:03:41 +0330
User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:38.0) Gecko/20100101
 Thunderbird/38.4.0
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.20
Precedence: list
List-Id: Networking and TCP/IP with FreeBSD <freebsd-net.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-net>,
 <mailto:freebsd-net-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-net/>
List-Post: <mailto:freebsd-net@freebsd.org>
List-Help: <mailto:freebsd-net-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-net>,
 <mailto:freebsd-net-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 01 Jan 2016 11:42:57 -0000

Hello everybody,
I'm about writing a packet filter using libpcap .. I just have two
theoretical question that I hope to get them answered here.

1)
Let say, I've initialed pcap on my ethernet nic using "pcap_open_live"
(in non-blocking-mode) and "pcap_dispatch". lets assume that the user
callback function (for dispatch) is implemented in not optimal manner
that takes for example 5 seconds to finish processing each packet. I
want to know what will happen to ongoing incoming packets ?! are they
getting buffered or queued somewhere in OS ? or they just get simply
dropped ?

2)
When i initial pcap with pcap_open_live, and I set "to_ms"
(read-timeout) parameter to zero .. I cannot catch a thing ! it has to
be more than zero to work .. Is it normal behavior ?

Thanks,

-- 
Hadi Rezaee
+98 912 1403571

IdeaTech.io