Registers socket to receive multicast messages sent to group.
socket must be a G_SOCKET_TYPE_DATAGRAM socket, and must have
been bound to an appropriate interface and port with
Socket.bind.
If iface is NULL, the system will automatically pick an interface
to bind to based on group.
If source_specific is TRUE, source-specific multicast as defined
in RFC 4604 is used. Note that on older platforms this may fail
with a G_IO_ERROR_NOT_SUPPORTED error.
Registers socket to receive multicast messages sent to group. socket must be a G_SOCKET_TYPE_DATAGRAM socket, and must have been bound to an appropriate interface and port with Socket.bind.
If iface is NULL, the system will automatically pick an interface to bind to based on group.
If source_specific is TRUE, source-specific multicast as defined in RFC 4604 is used. Note that on older platforms this may fail with a G_IO_ERROR_NOT_SUPPORTED error.
To bind to a given source-specific multicast address, use Socket.joinMulticastGroupSsm instead.