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The socket_number variable is an integer that identifies a raw
socket created by a call to the socket function, which takes
three arguments, two of which are macros defined in socket.h:
socket_number = socket (AF_INET, SOCK_STREAM, 0);
AF_INET indicates that the communication is to be between two
programs running on the Internet. SOCK_STREAM indicates that
communication is ordinary in the sense that both the server and the client
depend on each other to continue running and communicating. Finally,
the 0 indicates that ordinary low-level protocols are to be used in
the communication.