[issue45252] Missing support for Source Specific Multicast

Change by Terry J. Reedy : -- versions: -Python 3.10, Python 3.6, Python 3.7, Python 3.8, Python 3.9 ___ Python tracker ___ ___ Pyt

[issue45252] Missing support for Source Specific Multicast

New submission from CireSnave : It appears that Python's socket module is missing support for the IGMPv3 socket options needed to support Source Specific Multicast. Many developers appear to be adding the necessary constants through something like: if not hasattr(socket, "IP_UNBLOCK_SOURCE")