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USTAT(2)                   Linux Programmer's Manual                  USTAT(2)

       ustat - get file system statistics

       #include <sys/types.h>
       #include <unistd.h>    /* libc[45] */
       #include <ustat.h>     /* glibc2 */

       int ustat(dev_t dev, struct ustat *ubuf);

       ustat()  returns information about a mounted file system.  dev is a device number identifying a device contain-
       ing a mounted file system.  ubuf is a pointer to a ustat structure that contains the following members:

           daddr_t f_tfree;      /* Total free blocks */
           ino_t   f_tinode;     /* Number of free inodes */
           char    f_fname[6];   /* Filsys name */
           char    f_fpack[6];   /* Filsys pack name */

       The last two fields, f_fname and f_fpack, are not implemented and will always be filled with null bytes ('\0').

       On  success,  zero  is  returned and the ustat structure pointed to by ubuf will be filled in.  On error, -1 is
       returned, and errno is set appropriately.

       EFAULT ubuf points outside of your accessible address space.

       EINVAL dev does not refer to a device containing a mounted file system.

       ENOSYS The mounted file system referenced by dev does not support this  operation,  or  any  version  of  Linux
              before 1.3.16.


       ustat()  is  deprecated  and  has  only been provided for compatibility.  All new programs should use statfs(2)

   HP-UX Notes
       The HP-UX version of the ustat structure has an additional field, f_blksize, that is unknown elsewhere.   HP-UX
       warns:  For  some file systems, the number of free inodes does not change.  Such file systems will return -1 in
       the field f_tinode.  For some file systems, inodes are dynamically allocated.  Such file  systems  will  return
       the current number of free inodes.

       stat(2), statfs(2)

       This  page  is part of release 3.22 of the Linux man-pages project.  A description of the project, and informa-
       tion about reporting bugs, can be found at

Linux                             2003-08-04                          USTAT(2)