From owner-freebsd-hackers  Mon Jun  8 14:28:56 1998
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Received: (from majordom@localhost)
          by hub.freebsd.org (8.8.8/8.8.8) id OAA12536
          for freebsd-hackers-outgoing; Mon, 8 Jun 1998 14:28:56 -0700 (PDT)
          (envelope-from owner-freebsd-hackers@FreeBSD.ORG)
Received: from alpha.xerox.com (omega.Xerox.COM [13.1.64.95])
          by hub.freebsd.org (8.8.8/8.8.8) with SMTP id OAA12512
          for <hackers@freebsd.org>; Mon, 8 Jun 1998 14:28:44 -0700 (PDT)
          (envelope-from fenner@parc.xerox.com)
Received: from crevenia.parc.xerox.com ([13.2.116.11]) by alpha.xerox.com with SMTP id <32677(2)>; Mon, 8 Jun 1998 14:28:11 PDT
Received: from localhost by crevenia.parc.xerox.com with SMTP id <177515>; Mon, 8 Jun 1998 14:28:03 -0700
To: Luoqi Chen <luoqi@watermarkgroup.com>
cc: rminnich@sarnoff.com, hackers@FreeBSD.ORG
Subject: Re: ECONNREFUSED on a READ? 
In-reply-to: Your message of "Mon, 08 Jun 98 12:07:07 PDT."
             <199806081907.PAA19671@lor.watermarkgroup.com> 
Date: Mon, 8 Jun 1998 14:28:02 PDT
From: Bill Fenner <fenner@parc.xerox.com>
Message-Id: <98Jun8.142803pdt.177515@crevenia.parc.xerox.com>
Sender: owner-freebsd-hackers@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.ORG

Thanks, LQ, for pointing out the SOCK_DGRAM.  This is clearly the
resolver library doing a DNS query to a server that's not running
a name server.  The connect() on a datagram socket allows errors
(like ICMP port unreachable) to be delivered to the socket.  You
do the sendto(), you get back an ICMP port unreachable error, and
that ICMP error is delivered back to you by way of the recvfrom()
call.

  Bill

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