ustat(2) — Linux manual page


USTAT(2)                Linux Programmer's Manual               USTAT(2)

NAME         top

       ustat - get filesystem statistics

SYNOPSIS         top

       #include <sys/types.h>
       #include <unistd.h>    /* libc[45] */
       #include <ustat.h>     /* glibc2 */

       int ustat(dev_t dev, struct ustat *ubuf);

DESCRIPTION         top

       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 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         top

       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         top

       EFAULT ubuf points outside of your accessible address space.

       EINVAL dev does not refer to a device containing a mounted

       ENOSYS The mounted filesystem referenced by dev does not support
              this operation, or any version of Linux before 1.3.16.

VERSIONS         top

       Since version 2.28, glibc no longer provides a wrapper for this
       system call.

CONFORMING TO         top


NOTES         top

       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         top

       stat(2), statfs(2)

COLOPHON         top

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       and the latest version of this page, can be found at

Linux                          2021-03-22                       USTAT(2)

Pages that refer to this page: syscalls(2)