Create a connectionless pair of sockets that can communicate with each other without specifying any addresses in their I/O operations

1. Open SOCK_DGRAM socket srvr_s on srvr and bind it to srvr_addr address;

2. Open SOCK_DGRAM socket clnt_s on clnt and bind it to to clnt_addr address;

3. connect() clnt_s socket to srvr_s socket;

4. connect() srvr_s socket to clnt_s socket.

Parameters:

srvr	PCO for server part of connection
clnt	PCO for client part of connection
domain	Domain used in the connection
proto	Protocol used in the connection
srvr_addr	server address (cannot be NULL) to be used as a template for bind() on server side and for connect() on client side.
clnt_addr	address to bind client to (cannot be NULL)
srvr_s	SOCK_DGRAM socket reside on srvr
clnt_s	SOCK_DGRAM socket reside on clnt