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#### 8.7.3 `define-alien-routine` Example

Consider the C function `cfoo` with the following calling convention:

         void
         cfoo (str, a, i)
             char *str;
             char *a; /* update */
             int *i; /* out */
         {
           /* body of cfoo(...) */
         }

This can be described by the following call to `define-alien-routine`:

         (define-alien-routine "cfoo" void
           (str c-string)
           (a char :in-out)
           (i int :out))

The Lisp function `cfoo` will have two arguments (str and a) and two return values (a and i).