USTAT(2)

NAME
ustat - get file system 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 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 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 appropriately.

ERRORS

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.

CONFORMING TO
SVr4.

NOTES
ustat() is deprecated and has only been provided 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 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 inodes.

SEE ALSO
stat(2), statfs(2)