typedef struct _connection_ connection;

extern bool	   conn_init	 P((int, char**, char**, unsigned short*,
				    unsigned short*, int, int));
extern void	   conn_finish	 P((void));
extern void	   conn_listen	 P((void));
extern connection *conn_tnew6	 P((int));
extern connection *conn_tnew	 P((int));
extern connection *conn_bnew6	 P((int));
extern connection *conn_bnew	 P((int));
extern bool	   conn_udp	 P((connection*, char*, unsigned int));
extern void	   conn_del	 P((connection*));
extern void	   conn_block	 P((connection*, int));
extern int	   conn_select	 P((Uint, unsigned int));
extern bool	   conn_udpcheck P((connection*));
extern int	   conn_read	 P((connection*, char*, unsigned int));
extern int	   conn_udpread	 P((connection*, char*, unsigned int));
extern int	   conn_write	 P((connection*, char*, unsigned int));
extern int	   conn_udpwrite P((connection*, char*, unsigned int));
extern bool	   conn_wrdone	 P((connection*));
extern void	   conn_ipnum	 P((connection*, char*));
extern void	   conn_ipname	 P((connection*, char*));

extern bool	comm_init	P((int, char**, char**, unsigned short*,
				   unsigned short*, int, int));
extern void	comm_finish	P((void));
extern void	comm_listen	P((void));
extern int	comm_send	P((object*, string*));
extern int	comm_udpsend	P((object*, string*));
extern bool	comm_echo	P((object*, int));
extern void	comm_challenge	P((object*, string*));
extern void	comm_flush	P((void));
extern void	comm_block	P((object*, int));
extern void	comm_receive	P((frame*, Uint, unsigned int));
extern string  *comm_ip_number	P((object*));
extern string  *comm_ip_name	P((object*));
extern void	comm_close	P((frame*, object*));
extern object  *comm_user	P((void));
extern array   *comm_users	P((dataspace*));