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

       ustat - get filesystem statistics

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

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

       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').

       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.

       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.


       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

       stat(2), statfs(2)

       This  page  is  part of release 3.55 of the Linux man-pages project.  A description of the
       project,    and	  information	 about	  reporting    bugs,	can    be    found     at

Linux					    2003-08-04					 USTAT(2)
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