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=head2 New Things in this Example

This example added quite a few new concepts.  We'll take them one at a time.

=over 4

=item *

The INIT: directive contains code that will be placed immediately after
the argument stack is decoded.  C does not allow variable declarations at
arbitrary locations inside a function,
so this is usually the best way to declare local variables needed by the XSUB.
(Alternatively, one could put the whole C<PPCODE:> section into braces, and
put these declarations on top.)

=item *

This routine also returns a different number of arguments depending on the
success or failure of the call to statfs.  If there is an error, the error
number is returned as a single-element array.  If the call is successful,