BIO_set_accept_bios() can be used to set a chain of BIOs which
will be duplicated and prepended to the chain when an incoming
connection is received. This is useful if, for example, a
-buffering BIO is required for each connection.
+buffering or SSL BIO is required for each connection. The
+chain of BIOs must not be freed after this call, they will
+be automatically freed when the accept BIO is freed.
BIO_set_bind_mode() and BIO_get_bind_mode() set and retrieve
the current bind mode. If BIO_BIND_NORMAL (the default) is set