struct sockaddr_in srcAddr socklen_t srcAddrLen char buf int ret buf c

	struct sockaddr_in srcAddr;
	socklen_t srcAddrLen;
	char *buf;
	int ret;
	
	buf = (char *)malloc(1024);	
	ret = recvfrom(mCastSock, buf, 1024, 0,
			(struct sockaddr *)&srcAddr, &srcAddrLen);