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)