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



NAME
       ustat - get filesystem statistics

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

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

DESCRIPTION
       ustat()  returns information about a mounted filesystem.  dev is a device number identify‐
       ing a device containing a mounted filesystem.  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').

RETURN VALUE
       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.

ERRORS
       EFAULT ubuf points outside of your accessible address space.

       EINVAL dev does not refer to a device containing a mounted filesystem.

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

CONFORMING TO
       SVr4.

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

   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 filesystems, the number of free inodes does  not
       change.   Such  filesystems  will  return -1 in the field f_tinode.  For some filesystems,
       inodes are dynamically allocated.  Such filesystems will return the current number of free
       inodes.

SEE ALSO
       stat(2), statfs(2)

COLOPHON
       This  page  is  part of release 3.74 of the Linux man-pages project.  A description of the
       project, information about reporting bugs, and the latest version of  this  page,  can  be
       found at http://www.kernel.org/doc/man-pages/.



Linux                                       2003-08-04                                   USTAT(2)