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USTAT(2) Linux Programmer's Manual USTAT(2)
NAME
ustat - get filesystem statistics
SYNOPSIS
#include <sys/types.h>
#include <unistd.h> /* libc[45] */
#include <ustat.h> /* glibc2 */
int ustat(dev_t dev, struct ustat *ubuf);
DESCRIPTION
ustat() returns information about a mounted filesystem. dev is a device number identifying a device containing a mounted filesystem. ubuf is a pointer to a us‐
tat structure that contains the following members:
daddr_t f_tfree; /* Total free blocks */
ino_t f_tinode; /* Number of free inodes */
char f_fname[6]; /* Filsys name */
char f_fpack[6]; /* Filsys pack name */
The last two fields, f_fname and f_fpack, are not implemented and will always be filled with null bytes ('\0').
RETURN VALUE
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 to indicate the error.
ERRORS
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.
VERSIONS
Since version 2.28, glibc no longer provides a wrapper for this system call.
CONFORMING TO
SVr4.
NOTES
ustat() is deprecated and has been provided only for compatibility. All new programs should use statfs(2) instead.
HP-UX notes
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 inodes.
SEE ALSO
stat(2), statfs(2)
Linux 2021-03-22 USTAT(2)