Hopefully it is clear enough, that it is currently not recommended.
L<SSL_accept(3)|SSL_accept(3)>, L<SSL_clear(3)|SSL_clear(3)>,
L<SSL_connect(3)|SSL_connect(3)>,
L<SSL_CIPHER_get_name(3)|SSL_CIPHER_get_name(3)>,
+L<SSL_COMP_add_compression_method(3)|SSL_COMP_add_compression_method(3)>,
L<SSL_CTX_add_extra_chain_cert(3)|SSL_CTX_add_extra_chain_cert(3)>,
L<SSL_CTX_add_session(3)|SSL_CTX_add_session(3)>,
L<SSL_CTX_flush_sessions(3)|SSL_CTX_flush_sessions(3)>,