#include <stdio.h>		   /* standard C i/o facilities */
#include <errno.h>			 /* For error number checks */
#include <unistd.h>		   /* Unix System Calls */
#include <sys/types.h>	 /* system data type definitions */
#include <sys/stat.h>	   /* system data type definitions */
#include <sys/socket.h>  /* socket specific definitions */
#include <netinet/in.h>  /* INET constants and stuff */
#include <arpa/inet.h>	 /* IP address conversion stuff */
#include <string.h>	     /* For String manipulations */
#include <strings.h>	     /* For String manipulations */
#include <netdb.h>       /* The hostent structure    */
#include <malloc.h>		   /* The malloc includes! */
#include <stdlib.h>		   /* The malloc includes! */
#include <fcntl.h>		   /* Open, close, etc... */
#include <signal.h>			 /* To handle Unix Signals */
#include <setjmp.h>
#define MAXLINE 255
#define NUM_RETRIES 5
#define MAX_MSG_SIZE 512
#define WAIT_TIME 20
#define DNS_PORT 53

/*
 * common function declarations
 */
void crawler  (char *, int );
void service_clients ();