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Once a socket is constructed and is decorated with information, and a client
connection has been accepted, then it is time to assign pointer variables
that make the socket look like a file from the perspective of functions
such as fscanf and fprintf. The server program developed
here both reads from and writes to the socket; accordingly, both a read
file pointer and a write file pointer have to be created:
fm_client = (FILE *) fdopen (new_socket_number, "r"); to_client = (FILE *) fdopen (new_socket_number, "w");