TTL settings on OSX - gst-plugins-good - gst/udp/gstudpnetutils.c

[Dirk-Willem van Gulik]

Currently one has below snippet in

st-plugins-good: gst/udp/gstudpnetutils.c 

gst_udp_set_ttl (int sockfd, guint16 ss_family, int ttl, gboolean is_multicast)

 ...
    case AF_INET6:
    {
      set multicast on socket per normal
  …
    /* When using IPV4 address with IPV6 socket, both TTL values
         must be set in order to actually use the given value.
         Has no effect when IPV6 address is used. 
    */
      optname = (is_multicast == TRUE) ? IP_MULTICAST_TTL : IP_TTL;
      ret = setsockopt (sockfd, IPPROTO_IP, optname, &ttl, sizeof (ttl));
    …
   GST_DEBUG ("Error on setsockopt(IPPROTO_IP) with option %s to %d in IPv6 addr",
                (is_multicast == TRUE) ? "IP_MULTICAST_TTL" : "IP_TTL", ttl);
 
On OSX however this does have an effect - it seems to always bomb when is_multicast is true. What is the thinking behind this ?

Dw