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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

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