consequences (a control call is made to the affected BIOs) any effects will
be noted in the descriptions of individual BIOs.
+=head1 RETURN VALUES
+
+BIO_push() returns the end of the chain, B<b>.
+
+BIO_pop() returns the next BIO in the chain, or NULL if there is no next
+BIO.
+
=head1 EXAMPLES
For these examples suppose B<md1> and B<md2> are digest BIOs, B<b64> is
The call will return B<b64> and the new chain will be B<md1-b64-f> data can
be written to B<md1> as before.
-=head1 RETURN VALUES
-
-BIO_push() returns the end of the chain, B<b>.
-
-BIO_pop() returns the next BIO in the chain, or NULL if there is no next
-BIO.
-
=head1 SEE ALSO
L<bio>