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ustat - get file system statistics
#include <unistd.h> /* libc */
#include <ustat.h> /* glibc2 */
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 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, f_fname and f_fpack, are not implemented and will
always be filled with NUL 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
EFAULT ubuf points outside of your accessible address space.
EINVAL dev does not refer to a device containing a mounted file system.
ENOSYS The mounted file system referenced by dev does not support this
operation, or any version of Linux before 1.3.16.
SVr4. SVr4 documents additional error conditions ENOLINK, ECOMM, and
EINTR but has no ENOSYS condition.
ustat() is deprecated and has only been provided for compatibility.
All new programs should use statfs(2) instead.
The HP version of struct ustat has an additional field f_blksize that
is unknown elsewhere. HP warns: 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, inodes are dynamically
allocated. Such file systems will return the current number of free