How do you fstat an open directory?

[Mark Blackburn]

I've been trying to get chgrp -R from coreutils working and I ran up 
against this problem. I can't properly stat a directory whose file 
descriptor I get from the dirfd function/macro.

mark@althor ~
$ cat > testcase.c
#include <stdlib.h>
#include <dirent.h>
#include <unistd.h>
#include <sys/stat.h>
#include <stdio.h>


int main() {
   DIR *dirp;
   int fd;
   struct stat sb;
   dirp = opendir("d");
   fd = dirfd(dirp);
   fstat(fd, &sb);
   printf("inode of d:%llu\n", sb.st_ino);
}

mark@althor ~
$ gcc testcase.c -o testcase

mark@althor ~
$ mkdir d

mark@althor ~
$ ./testcase.exe
inode of d:17489383932880356520

mark@althor ~
$ ls -id d
3659174697343209 d/

mark@althor ~
$

Notice that the inodes don't match from ls -id and from my test program. 
Am I doing something wrong?

Mark Blackburn

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