#include <stdlib.h>
#include <stdio.h>
#include <net/if.h>


int main(int argc, char* argv[])
{
        struct if_nameindex* ifs;
        int i;

        ifs = if_nameindex();
        if (ifs == NULL) { 
                perror("if_nameindex"); 
                exit(EXIT_FAILURE);
        }

        for (i = 0; ifs[i].if_index != 0 || ifs[i].if_name != NULL; i++) {
                printf("%d %s\n", ifs[i].if_index, ifs[i].if_name);
        }

        return EXIT_SUCCESS;
}