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Date:	Fri, 20 Feb 2009 05:40:00 -0800 (PST)
From:	victhor_1983 <victhor_1983 AT yahoo DOT es>
To:	cygwin AT cygwin DOT com
Subject:	Re: Problem Adding Membership Multicast Errno 22
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Thanks for the advice, I just tried it, but I keep getting the same mistake.
Maybe there is no IP_ADD_MEMBERSHIP option for Multicast in Cygwin?


Victor


Corinna Vinschen-2 wrote:
>=20
> On Feb 20 04:05, victhor_1983 wrote:
>>=20
>> Hi,
>>=20
>> I have written a C++ program for a Multicast Client that compiles and
>> runs
>> on Ubuntu. I tried to compile and run it on Cygwin version 1.5.25 (June
>> 2008). However, when I run the code, the Multicast receiving socket
>> doesn't
>> seem to work. The problem comes when I use setsockopt() to add Multicast
>> membership. The errno() declaration returns 22 (EINVAL), but I cannot
>> find a
>> solution. My code is:
>>=20
>> 	int Descriptor, Descriptor2, payloadoffset,sqnum, T_ns, status;
>> 	long nsegundos,Dnsegundos, segundos,  Dsegundos;
>> 	struct sockaddr_in Direccion, Direccion2;
>> 	unsigned short Puerto;
>> 	struct timespec valorcontador,valorcontador2,Next;
>> 	struct ip_mreq Multic;
>>=20
>>         Descriptor=3Dsocket(AF_INET,SOCK_DGRAM,0);
>> 	Puerto=3D12100;
>> 	Direccion.sin_family=3DAF_INET;
>> 	Direccion.sin_port=3Dhtons(Puerto);
>> 	Direccion.sin_addr.s_addr=3Dinet_addr("224.0.22.1");
>> 	memset(&(Direccion.sin_zero),'\0',8);=20=20=20
>>=20
>>        	Multic.imr_multiaddr.s_addr=3Dinet_addr("224.0.22.1");
>> 	Multic.imr_interface.s_addr=3Dinet_addr("138.4.32.34");
>> 	status=3D setsockopt(Descriptor, IPPROTO_IP, IP_ADD_MEMBERSHIP, &Multic,
>> sizeof(Multic));
>>         if (status<0){
>>            printf("Fallo al a=C3=B1adir el grupo de Multicast, codigo %i=
\n",
>> errno);
>> 	}
>=20
> I'm sorry, I can't tell you why this doesn't work.  Cygwin's setsockopt
> function is basically just a shim between application and Winsock's
> setsockopt call.  It only performs special actions on a very limited
> set of options, only two actually: (SOL_SOCKET, SO_REUSEADDR) and
> (IPPROTO_IP, IP_TOS).  I'm also quite multicast illiterate.  Is it
> possible that you have to use the IP_MULTICAST_IF option on Windows
> before you can use IP_ADD_MEMBERSHIP?!?
>=20
>=20
> Corinna
>=20
> --=20
> Corinna Vinschen                  Please, send mails regarding Cygwin to
> Cygwin Project Co-Leader          cygwin AT cygwin DOT com
> Red Hat
>=20
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>=20
>=20
>=20

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