mode_t   st_mode;                /* File mode (see mknod(2)) */
     ino_t    st_ino;                 /* Inode number */
     dev_t    st_dev;                 /* ID of device containing */
                                      /* a directory entry for this file */
     dev_t    st_rdev;                /* ID of device */
                                      /* This entry is defined only for */
                                      /* char special or block special files */
     nlink_t  st_nlink;               /* Number of links */
     uid_t    st_uid;                 /* User ID of the file's owner */
     gid_t    st_gid;                 /* Group ID of the file's group */
     off_t    st_size;                /* File size in bytes */
     time_t   st_atime;               /* Time of last access */
     time_t   st_mtime;               /* Time of last data modification */
     time_t   st_ctime;               /* Time of last file status change */
                                      /* Times measured in seconds since */
                                      /* 00:00:00 UTC, Jan. 1, 1970 */
     long     st_blksize;             /* Preferred I/O block size */
     blkcnt_t st_blocks;              /* Number of 512 byte blocks allocated*/
     char     st_fstype[_ST_FSTYPSZ]; /* Null-terminated type of filesystem */

//#include <sys/vfs.h>
#include <sys/types.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <iostream>
 
using namespace std;
 
struct stat buffer;
int status;
off_t size;
blkcnt_t fblock;
 
int main(){
    size = buffer.st_size;
    fblock = buffer.st_blocks;
 
    int fildes = open("/dev/hda", O_RDWR);
 
    status = fstat(fildes, &buffer);
 
    cout << "size: " << size << endl;
    cout << "free blocks: " << fblock << endl;    
 
    cout << status << endl;
    return 0;
}