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From: "Dave Korn" <dave DOT korn AT artimi DOT com>
To: <cygwin AT cygwin DOT com>
Subject: RE: Cygwin 1.5.18: Problem using setsockopt() for multicast
Date: Thu, 17 Aug 2006 14:48:42 +0100
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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....


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