USTAT(2) manual page

SYNOPSIS

#include <sys/types.h>
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 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 characters.

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 appropriately.

ERRORS

EINVAL: dev does not refer to a device containing a mounted file system.
EFAULT: ubuf points outside of your accessible address space.
ENOSYS: The mounted file system referenced by dev does not support this operation, or any version of Linux before 1.3.16.

NOTES

ustat has only been provided for compatibility. All new programs should use statfs(2) instead.

HISTORY

ustat was first implemented in Linux 1.3.16. All versions of Linux before 1.3.16 will return ENOSYS.

CONFORMING TO

System V

NAME