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Date:	Fri, 20 Feb 2009 04:05:36 -0800 (PST)
From:	victhor_1983 <victhor_1983 AT yahoo DOT es>
To:	cygwin AT cygwin DOT com
Subject:	Problem Adding Membership Multicast Errno 22
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Hi,

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:

	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;

        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

       	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);
	}

I would really appreciate your help with this. Thanks in advance.
Victor


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