www.pudn.com > ARQ.rar > protocol.h

#include "stdio.h" 
#define MAX_PKT 4	/* determines packet size in bytes */ 
 
typedef enum {false, true} boolean;	/* boolean type */ 
typedef unsigned int seq_nr;	/* sequence or ack numbers */ 
typedef struct {unsigned char data[MAX_PKT];} packet;	/* packet definition */ 
typedef enum {data, ack, nak} frame_kind;	/* frame_kind definition */ 
 
typedef struct {	/* frames are transported in this layer */ 
  frame_kind kind;	/* what kind of a frame is it? */ 
  seq_nr seq;   	/* sequence number */ 
  seq_nr ack;   	/* acknowledgement number */ 
  packet info;  	/* the network layer packet */ 
} frame; 
 
/* Wait for an event to happen; return its type in event. */ 
void wait_for_event(event_type *event) 
{ 
	printf("wait for event\n"); 
} 
 
/* Fetch a packet from the network layer for transmission on the channel. */ 
void from_network_layer(packet *p) 
{ 
	printf("from network layer\n"); 
} 
 
/* Deliver information from an inbound frame to the network layer. */ 
void to_network_layer(packet *p) 
{ 
	printf("to network layer\n"); 
} 
 
/* Go get an inbound frame from the physical layer and copy it to r. */ 
void from_physical_layer(frame *r) 
{ 
	printf("from physical layer\n"); 
} 
 
/* Pass the frame to the physical layer for transmission. */ 
void to_physical_layer(frame *s) 
{ 
	printf("to physical layer\n"); 
} 
 
/* Start the clock running and enable the timeout event. */ 
void start_timer(seq_nr k) 
{ 
	printf("start timer\n"); 
} 
 
/* Stop the clock and disable the timeout event. */ 
void stop_timer(seq_nr k) 
{ 
	printf("stop timer\n"); 
} 
 
/* Start an auxiliary timer and enable the ack_timeout event. */ 
void start_ack_timer(void) 
{ 
	printf("start ack timer\n"); 
} 
 
/* Stop the auxiliary timer and disable the ack_timeout event. */ 
void stop_ack_timer(void) 
{ 
	printf("stop ack timer\n"); 
} 
 
/* Allow the network layer to cause a network_layer_ready event. */ 
void enable_network_layer(void) 
{ 
	printf("enable network layer\n"); 
} 
 
/* Forbid the network layer from causing a network_layer_ready event. */ 
void disable_network_layer(void) 
{ 
	printf("disable network layer\n"); 
} 
 
/* Macro inc is expanded in-line: Increment k circularly. */ 
#define inc(k) if (k < MAX_SEQ) k = k + 1; else k = 0