X-Spam-Check-By: sourceware.org
From: "Dave Korn" <dave.korn@artimi.com>
To: <cygwin@cygwin.com>
Subject: RE: Cygwin 1.5.18: Problem using setsockopt() for multicast
Date: Thu, 17 Aug 2006 14:48:42 +0100
Message-ID: <00cf01c6c203$da04b5b0$a501a8c0@CAM.ARTIMI.COM>
MIME-Version: 1.0
Content-Type: text/plain; 	charset="us-ascii"
Content-Transfer-Encoding: 7bit
X-Mailer: Microsoft Office Outlook 11
In-Reply-To: <Pine.CYG.4.58.0608170836160.2408@PC1163-8460-XP.flightsafety.com>
Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm
Precedence: bulk
List-Unsubscribe: <mailto:cygwin-unsubscribe-archive-cygwin=delorie.com@cygwin.com>
List-Subscribe: <mailto:cygwin-subscribe@cygwin.com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin@cygwin.com>
List-Help: <mailto:cygwin-help@cygwin.com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner@cygwin.com
Mail-Followup-To: cygwin@cygwin.com
Delivered-To: mailing list cygwin@cygwin.com

On 17 August 2006 14:45, Brian Ford wrote:

> On Thu, 17 Aug 2006, Alessandro Saffiotti wrote:
> 
>> I ran into the following problem when using setsockopt to create a
>> multicast receiver in my own application.  Here is the relevant part of
>> the code: 
>> 
>>   tcp_broadcast_receiver = socket(PF_INET,SOCK_DGRAM,IPPROTO_IP);
>> 
>>   memset(&imreq, 0, sizeof(struct ip_mreq));
>>   imreq.imr_multiaddr.s_addr = inet_addr("227.1.3.5");
>>   imreq.imr_interface.s_addr = INADDR_ANY;
> 
> INADDR_ANY is in host byte order, but you need network order for this
> call.

  Yeh, that's it!  And don't forget to use left-handed bits - the ordinary
right-handed ones are no good for INADDR_ANY.  :)

    cheers,
      DaveK
-- 
Can't think of a witty .sigline today....


--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Problem reports:       http://cygwin.com/problems.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/