Looks up the #GType to be used when creating socket connections on sockets with the specified family, type and protocol.
If no type is registered, the #GSocketConnection base type is returned.
a #GType, inheriting from G_TYPE_SOCKET_CONNECTION
a #GSocketFamily
a #GSocketType
a protocol id
Looks up the #GType to be used when creating socket connections on sockets with the specified family, type and protocol.
If no type is registered, the #GSocketConnection base type is returned.