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 (aq\0aq).
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.
This page is part of release 3.14 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
