The callback function is called as B<callback(SSL *ssl, int where, int ret)>.
The B<where> argument specifies information about where (in which context)
-the callback function was called. If B<ret> is 0, an error condition occured.
+the callback function was called. If B<ret> is 0, an error condition occurred.
If an alert is handled, SSL_CB_ALERT is set and B<ret> specifies the alert
information.