int BIO_destroy_bio_pair(BIO *b);
int BIO_shutdown_wr(BIO *b);
-
int BIO_set_write_buf_size(BIO *b, long size);
size_t BIO_get_write_buf_size(BIO *b, long size);
without having to go through the SSL-interface.
BIO *internal_bio, *network_bio;
+
...
BIO_new_bio_pair(&internal_bio, 0, &network_bio, 0);
SSL_set_bio(ssl, internal_bio, internal_bio);