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RedHat 9 (Linux i386) - man page for ustat (redhat section 2)

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

       ustat - get file system statistics

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

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

       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.

       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.

       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.

       ustat has only been provided for compatibility. All  new  programs  should  use	statfs(2)

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

       statfs(2), stat(2)

Linux 1.3.16				    1995-08-09					 USTAT(2)
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