The C function tcp_connect() is used by C clients to connect to some server running on machine host at some port. It returns the newly created socket. The following program fragment demonstrates the use of the C function tcp_connect() along with its companion C function tcp_address_from_file():

     #include "tcp.h"
     int c,port;
     char *host;
     if(tcp_address_from_file(serverfile, &port, &host) != 0)
         ... an error occurred.
     c = tcp_connect(host, port);
     if (c == -1)  ... an error occurred.

A fuller example of the above can be found in the demonstration program cs.c.