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



NAME
       ustat - get file system 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  file  system.  dev is a device number identifying a device containing 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').

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 file system.

       ENOSYS The mounted file system 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 only been provided 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 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.

SEE ALSO
       stat(2), statfs(2)

COLOPHON
       This page is part of release 3.25 of the Linux man-pages project.  A description of the project,  and  information  about
       reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



Linux                                                      2003-08-04                                                   USTAT(2)