//FILE: network/network.h
//
//Description: this file defines the data structures and functions for SNP process  
//
//Date: April 29,2008


#ifndef NETWORK_H
#define NETWORK_H

//this function is used to for the SNP process to connect to the local ON process on port OVERLAY_PORT
//connection descriptor is returned if success, otherwise return -1
int connectToOverlay();

//This thread sends out route update packets every RU_INTERVAL time
//In this lab this thread only broadcasts empty route update packets to all the neighbors, broadcasting is done by set the dest_nodeID in packet header as BROADCAST_NODEID
void* routeupdate_daemon(void* arg);

//this thread handles incoming packets from the ON process
//It receives packets from the ON process by calling overlay_recvpkt()
//In this lab, after receiving a packet, this thread just outputs the packet received information without handling the packet 
void* pkthandler(void* arg); 

//this function stops the SNP process 
//it closes all the connections and frees all the dynamically allocated memory
//it is called when the SNP process receives a signal SIGINT
void network_stop();
#endif