USTAT(2) System Calls USTAT(2)

NAME

ustat - get file system statistics

SYNOPSIS

#include <sys/types.h>
#include <ustat.h>

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

DESCRIPTION

The ustat() function returns information about a mounted file system.
The dev argument is a device number identifying a device containing a
mounted file system (see makedev(3C)). The buf argument is a pointer to a
ustat structure that includes 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 f_fname and f_fpack members may not contain significant information
on all systems; in this case, these members will contain the null
character as the first character.

RETURN VALUES

Upon successful completion, 0 is returned. Otherwise, -1 is returned and
errno is set to indicate the error.

ERRORS

The ustat() function will fail if:

ECOMM
The dev argument is on a remote machine and the link to that
machine is no longer active.


EFAULT
The buf argument points to an illegal address.


EINTR
A signal was caught during the execution of the ustat()
function.


EINVAL
The dev argument is not the device number of a device
containing a mounted file system.


ENOLINK
The dev argument refers to a device on a remote machine and
the link to that machine is no longer active.


EOVERFLOW
One of the values returned cannot be represented in the
structure pointed to by buf.

USAGE

The statvfs(2) function should be used in favor of ustat().

SEE ALSO

stat(2), statvfs(2), makedev(3C), lfcompile(7)

BUGS

The NFS revision 2 protocol does not permit the number of free files to
be provided to the client; therefore, when ustat() has completed on an
NFS file system, f_tinode is always -1.

July 23, 2001 USTAT(2)