#define	BUFSIZE		1500

			/* globals */
char recvbuf[BUFSIZE];
char sendbuf[BUFSIZE];

int  datalen;			/* #bytes of data, following ICMP header */
int   nsent;				/* add 1 for each sendto() */
pid_t pid;				/* our PID */
int   sockfd;
int   verbose;
char  stopPing;
			/* function prototypes */
void	 proc_v4(char *, ssize_t, struct timeval *);
void	 proc_v6(char *, ssize_t, struct timeval *);
void	 send_v4(void);
void	 send_v6(void);
int      readloop(void);
void	 sig_alrm(int);
void	 tv_sub(struct timeval *, struct timeval *);
char*    sock_ntop_host(const struct sockaddr *sa, socklen_t salen);
unsigned short in_cksum(unsigned short *addr, int len);
struct proto {
  void	 (*fproc)(char *, ssize_t, struct timeval *);
  void	 (*fsend)(void);
  struct sockaddr  *sasend;	/* sockaddr{} for send, from getaddrinfo */
  struct sockaddr  *sarecv;	/* sockaddr{} for receiving */
  socklen_t	    salen;		/* length of sockaddr{}s */
  int	   	    icmpproto;	/* IPPROTO_xxx value for ICMP */
  unsigned long n_send;
  unsigned long n_recv;
} *pr;