How to convert a Normal Socket into a GSocket (GLib)?

Question

I have opened a socket say,

fd1 = socket(AF_INET, SOCK_RAW, IPPROTO_UDP)

and I have opened a GSocket say

GSocket socket =
            g_socket_new (AF_INET, G_SOCKET_TYPE_DATAGRAM ,
                                   G_SOCKET_PROTOCOL_UDP, &err);

Can someone please help me as how I can assign the fd1 into socket->fd, where fd in socket->fd is a property of GSocket.

Much Regards