ustat() - get mounted file system statistics
int ustat(dev_t dev, struct ustat *buf);
The ustat() system call returns information about a mounted file
system. dev is a device number identifying a device containing a
mounted file system. buf is a pointer to a ustat structure (defined
in <<<<ustat.h>>>>) that includes the following elements:
daddr_t f_tfree; /* Total free blocks */
ino_t f_tinode; /* Number of free inodes */
char f_fname; /* Filsys name or null */
char f_fpack; /* Filsys pack name or null */
int f_blksize; /* Block size */
The value of f_tfree is the number of free blocks of size f_blksize.
ustat() returns the following values:
0 Successful completion.
-1 Failure. errno is set to indicate the error.
If ustat() fails, errno is set to one of the following values.
[EFAULT] buf points outside the process's allocated address
space. The reliable detection of this error is
[EINVAL] dev is not the device number of a device
containing a mounted file system.
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, the inodes can be dynamically allocated. For
such file systems, the field f_tinode contains the number of free
inodes at the current time.
ustat() was developed by AT&T and HP.
touch(1), stat(2), statvfs(2), fs(4), fs_vxfs(4).
Hewlett-Packard Company - 1 - HP-UX Release 11i: November 2000
ustat(): SVID2, SVID3, XPG2
Hewlett-Packard Company - 2 - HP-UX Release 11i: November 2000