#define NETERR      0
#define FAIL        1
#define SUCC        2

int do_receive(GENFRAME *gfp);
int udp_receive(GENFRAME *gfp, int len);
void udp_transmit(GENFRAME *gfp, NODE *sp, NODE *dp, void *dat, int len);
void udp_transmit_text(GENFRAME *gfp, NODE *sp, NODE *dp, char *in);
void do_poll(GENFRAME *gfp);

void Datagram_test(void);