Linux 2.6 - man page for ustat (linux section 2)
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USTAT(2) Linux Programmer's Manual USTAT(2)
ustat - get filesystem statistics
#include <unistd.h> /* libc */
#include <ustat.h> /* glibc2 */
int ustat(dev_t dev, struct ustat *ubuf);
ustat() returns information about a mounted filesystem. dev is a device number identify-
ing a device containing a mounted filesystem. ubuf is a pointer to a ustat structure 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 implemented and will always be filled
with null bytes ('\0').
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.
EFAULT ubuf points outside of your accessible address space.
EINVAL dev does not refer to a device containing a mounted filesystem.
ENOSYS The mounted filesystem referenced by dev does not support this operation, or any
version of Linux before 1.3.16.
ustat() is deprecated and has been provided only for compatibility. All new programs
should use statfs(2) instead.
The HP-UX version of the ustat structure has an additional field, f_blksize, 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
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Linux 2003-08-04 USTAT(2)
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