ustat - get file system statistics
int ustat(dev_t dev, struct ustat *buf);
The ustat() function returns information about a mounted
file system. The dev argument is a device number identify-
ing 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; /* Filsys name */
char f_fpack; /* 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.
Upon successful completion, 0 is returned. Otherwise, -1 is
returned and errno is set to indicate the error.
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to that machine is no longer active.
The buf argument points to an illegal address.
EINTR A signal was caught during the execution of the
The dev argument is not the device number of a device
containing a mounted file system.
The dev argument refers to a device on a remote
machine and the link to that machine is no longer
One of the values returned cannot be represented in
the structure pointed to by buf.
The statvfs(2) function should be used in favor of ustat().
stat(2), statvfs(2), makedev(3C), lfcompile(5)
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
Man(1) output converted with