Section: Linux Programmer's Manual (2)
Return to Main Contents
ustat - get file system statistics
#include <unistd.h> /* libc */
#include <ustat.h> /* glibc2 */
int ustat(dev_t dev, struct ustat *ubuf);
returns information about a mounted file system.
is a device number identifying a device containing
a mounted file system.
is a pointer to a ustat structure that contains the following
daddr_t f_tfree; /* Total free blocks */
ino_t f_tinode; /* Number of free inodes */
char f_fname; /* Filsys name */
char f_fpack; /* Filsys pack name */
The last two fields,
are not implemented and will
always be filled with null bytes ('\0').
On success, zero is returned and the
structure pointed to by
will be filled in.
On error, -1 is returned, and
is set appropriately.
points outside of your accessible address space.
does not refer to a device containing a mounted file system.
The mounted file system referenced by
does not support this operation, or any version of Linux before
is deprecated and has only been provided for compatibility.
All new programs should use
The HP-UX version of the
structure has an additional field,
that is unknown elsewhere.
For some file systems, the number of free inodes does not change.
Such file systems will return -1 in the field
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 3.27 of the Linux
A description of the project,
and information about reporting bugs,
can be found at
- RETURN VALUE
- CONFORMING TO
- HP-UX Notes
- SEE ALSO
This document was created by
using the manual pages.
Time: 19:49:19 GMT, April 27, 2011