-/* protos */
-static int gethostaddr(const char * name);
-static void read_hosts(const char * cfg_file_name);
-static void init_hosts(void);
-static void get_response(void);
-static void pinger(int);
-static int in_cksum(unsigned short * addr, int len);
-static void read_icmp_data(struct monitor_host * p);
-static void tvsub(struct timeval * out, struct timeval * in);
-static int gcd(int x, int y);
-