#include <stdio.h>
#include <libnet.h>

int main()
{
	while(1) {
		char buf[LIBNET_ERRBUF_SIZE];
        	struct libnet_link_int *network = 
			libnet_open_link_interface("eth0", buf);
		if (network)
        		libnet_close_link_interface(network);
	}
}