#include <pcap.h>

int
main(void) {
	int err;
	char errbuf[PCAP_ERRBUF_SIZE];
	bpf_u_int32 netp, maskp;

	err = pcap_lookupnet("eth0", &netp, &maskp, errbuf);
	if (err < 0) {
		printf("pcap_lookupnet failed %d\n", err);
		return err;
	}
	printf("result: %x %x\n", netp, maskp);
	return 0;
}