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 de-
       vice 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 appro-
       priately.

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

SEE ALSO
       stat(2), statfs(2)

COLOPHON
       This page is part of release 5.05 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)