  10.3.3 Accounting with Scheme  The Scheme accounting procedure
must be declared as follows:  Function Template: acct-function-
name request-list  Its argument is:   The list of A/V pairs from
the incoming request  The function must return a boolean value.
The accounting succeeds only if it has returned #t.  Here is an
example of a Scheme accounting function. The function dumps the
contents of the incoming request to a file:  (define radius-
acct-file "/var/log/acct/radius")  (define (acct req)   (call-
with-output-file radius-acct-file     (lambda (port)       (for-
each (lambda (pair)                   (display (car pair) port)
(display "=" port)                   (display (cdr pair) port)
(newline port))       (newline port)))