imr.imr_interface.s_addr = htonl (INADDR_ANY);
if (setsockopt (rs, IPPROTO_IP, IP_ADD_MEMBERSHIP,
&imr, sizeof (struct ip_mreq)) < 0)
imr.imr_interface.s_addr = htonl (INADDR_ANY);
if (setsockopt (rs, IPPROTO_IP, IP_ADD_MEMBERSHIP,
&imr, sizeof (struct ip_mreq)) < 0)