ustat - get file system statistics
int ustat(dev_t dev, struct ustat * ubuf);
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 struc
ture that contains 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 last two fields, f_fname and f_fpack, are not imple
mented and will always be filled with null characters.
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.
EINVAL dev does not refer to a device containing a mounted
EFAULT ubuf points outside of your accessible address
ENOSYS The mounted file system referenced by dev does not
support this operation, or any version of Linux
ustat has only been provided for compatibility. All new
programs should use statfs(2) instead.
SVr4. SVr4 documents additional error conditions ENOLINK,
ECOMM, and EINTR but has no ENOSYS condition.