#define _GNU_SOURCE
#include <error.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>

# define SAME_INODE(Stat_buf_1, Stat_buf_2) \
   ((Stat_buf_1).st_ino == (Stat_buf_2).st_ino \
    && (Stat_buf_1).st_dev == (Stat_buf_2).st_dev)

int
main (int argc, char **argv)
{
  int fd;
  struct stat st1, st2;

  if (argc != 2)
    error (1, 0, "Usage: %s <file>", argv[0]);

  if ((fd = open (argv[1], O_RDONLY | O_NOFOLLOW, 0)) == -1)
    error (1, errno, "error when opening %s", argv[1]);

  if (fstat (fd, &st1) == -1)
    error (1, errno, "error when stating %s", argv[1]);

  if (lstat (argv[1], &st2) == -1)
    error (1, errno, "error when stating %s", argv[1]);

  printf ("devices: %d %d, %d %d\n", st1.st_dev, st2.st_dev);

  if (SAME_INODE(st1, st2))
    printf ("same inode!\n");
  else
    printf ("different inode!\n");

  return 0;
}