=head1 NAME
BIO_set_callback_ex, BIO_get_callback_ex, BIO_set_callback, BIO_get_callback,
-BIO_set_callback_arg, BIO_get_callback_arg, BIO_debug_callback
+BIO_set_callback_arg, BIO_get_callback_arg, BIO_debug_callback,
+BIO_callback_fn_ex, BIO_callback_fn
- BIO callback functions
=head1 SYNOPSIS
is the type of the old format callback function. The meaning of each argument
is described below:
-=over
+=over 4
=item B<b>