NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON

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

NAME         top

       ustat - get filesystem statistics

SYNOPSIS         top

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

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

DESCRIPTION         top

       ustat() returns information about a mounted filesystem.  dev is a
       device number identifying 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         top

       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         top

       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         top

       SVr4.

NOTES         top

       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         top

       stat(2), statfs(2)

COLOPHON         top

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Linux                            2003-08-04                         USTAT(2)