#include <fcntl.h>
#include <stdio.h>
#include <sys/stat.h>

int
main (void)
{
  int  i, found = 0;
  struct stat  st;
  fprintf (stderr, "file descriptors open:\n");

  for (i = 0; i < 20; i++)
    {
      if (fstat (i, &st) != -1)
        {
          found = 1;
          fprintf (stderr, "%d: %X %s\n",
                   i, st.st_mode,
                   S_ISREG (st.st_mode) ? "reg"
                   : S_ISCHR (st.st_mode) ? "chr"
                   : S_ISFIFO (st.st_mode) ? "fifo"
                   : "unknown");

        }
    }

  if (! found)
    fprintf (stderr, " none\n");

  return 0;
}