ustat

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 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
       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.

VERSIONS
       Since version 2.28, glibc no longer provides a wrapper for this system
       call.

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 5.10 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
       https://www.kernel.org/doc/man-pages/.



Linux                              2019-03-06                           USTAT(2)