Tiny program for listing network interface names and indexes in Linux

listifs.c

/* Tiny program for listing network interface names and indexes in Linux.
 *
 * Compile with: gcc -std=c99 -o listifs listifs.c
 */

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

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

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

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

   if_freenameindex(array);
   exit(EXIT_SUCCESS);
}