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Once the server has accepted the connection, 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
client 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:
to_server = fdopen (socket_number, "w"); fm_server = fdopen (socket_number, "r");