ustat - get filesystem statistics
#include <unistd.h> /* libc */
#include <ustat.h> /* glibc2 */
int ustat(dev_t dev, struct ustat *ubuf);
() returns information about a mounted filesystem. dev
device number identifying a device containing a mounted filesystem.
is a pointer to a ustat
structure that contains the
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
, are not implemented and
will always be filled with null bytes ('\0').
On success, zero is returned and the ustat
structure pointed to by
will be filled in. On error, -1 is returned, and errno
- ubuf points outside of your accessible address space.
- dev does not refer to a device containing a mounted
- The mounted filesystem referenced by dev does not support this
operation, or any version of Linux before 1.3.16.
Since version 2.28, glibc no longer provides a wrapper for this system call.
() is deprecated and has been provided only for compatibility. All
new programs should use statfs
The HP-UX version of the ustat
structure has an additional field,
, that is unknown elsewhere. HP-UX warns: For some
filesystems, the number of free inodes does not change. Such filesystems will
return -1 in the field f_tinode
. For some filesystems, inodes are
dynamically allocated. Such filesystems will return the current number of free