deserialize

Tries to deserialize a socket control message of a given level and type.

This will ask all known (to GType) subclasses of SocketControlMessage if they can understand this kind of message and if so deserialize it into a SocketControlMessage.

If there is no implementation for this kind of control message, null will be returned.

Parameters:

level	a socket level
type	a socket control message type for the given level
data	pointer to the message data
size	the size of the data in bytes

Returns:

the deserialized message or null