//-----------------------------------------------------
//            T C P . h
//-----------------------------------------------------
//   routines to manuiplate tcp connection
//   include ...    
//            establish an connection  (using socket)
//-----------------------------------------------------
//    part (a few lines)  obtain from    
//           http://munkora.cs.mu.oz.au/~ad/code/net/lyse.c
//    by Andrew Davison.  Prince of Songkla University, Thailand
//           http://munkora.cs.mu.oz.au/~ad/
//-----------------------------------------------------
int establish_connection ( char *host, int port_number, FILE **fp );
int open_socket(char *host, char *cmd, int port_number);