"Usage: %s [-adeflnNOpqStvxX] [-c count] [ -F file ]\n", program_name);
"Usage: %s [-adeflnNOpqStvxX] [-c count] [-F file] [-i interface] [-r file]\n", program_name);
usage(void){	extern char version[];	extern char pcap_version[];	(void)fprintf(stderr, "%s version %s\n", program_name, version);	(void)fprintf(stderr, "libpcap version %s\n", pcap_version);	(void)fprintf(stderr,"Usage: %s [-adeflnNOpqStvxX] [-c count] [ -F file ]\n", program_name);	(void)fprintf(stderr,"\t\t[ -i interface ] [ -r file ] [ -s snaplen ]\n");	(void)fprintf(stderr,"\t\t[ -T type ] [ -w file ] [ expression ]\n");	exit(1);}