redhat man page for ustat

USTAT(2)						     Linux Programmer's Manual							  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 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.

CONFORMING TO
       SVr4.  SVr4 documents additional error conditions ENOLINK, ECOMM, and EINTR but has no ENOSYS condition.

SEE ALSO
       statfs(2), stat(2)

Linux 1.3.16							    1995-08-09								  USTAT(2)