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ustat(2)							      ustat(2)

NAME
       ustat() - get mounted file system statistics

SYNOPSIS
DESCRIPTION
       The  system  call returns information about a mounted file system.  dev
       is a device number identifying a device containing a mounted file  sys‐
       tem.   buf  is  a  pointer to a structure (defined in that includes the
       following elements:

	      int32_t  f_tfree;	       /* Total free blocks */
	      ino_t    f_tinode;       /* Number of free inodes */
	      char     f_fname[6];     /* Filsys name or null */
	      char     f_fpack[6];     /* Filsys pack name or null */
	      int      f_blksize;      /* Block size */

       The value of is the number of free blocks of size

RETURN VALUE
       returns the following values:

	      Successful completion.
	      Failure.
		     is set to indicate the error.

ERRORS
       If fails, is set to one of the following values.

	      [EFAULT]		 buf points outside  the  process's  allocated
				 address  space.   The	reliable  detection of
				 this error is implementation dependent.

	      [EINVAL]		 dev is not the device number of a device con‐
				 taining a mounted file system.

	      [EOVERFLOW]	 Result	 would	overflow  f_tfree  or  another
				 field of the struct.

WARNINGS
       is deprecated and should be used only by	 legacy	 32-bit	 applications.
       or are the recommended replacements.

       For some file systems, the number of free inodes does not change.  Such
       file systems will return in the field

       For some file systems, the inodes can be	 dynamically  allocated.   For
       such  file systems, the field contains the number of free inodes at the
       current time.

AUTHOR
       was developed by AT&T and HP.

SEE ALSO
       touch(1), stat(2), statvfs(2), fs_vxfs(4), privileges(5).

STANDARDS CONFORMANCE
								      ustat(2)

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