BIO_new_socket
sbio = BIO_new_socket(sock, BIO_NOCLOSE);
sbio = BIO_new_socket(s, BIO_NOCLOSE);
sbio = BIO_new_socket(s, BIO_NOCLOSE);
sbio = BIO_new_socket(s, BIO_NOCLOSE);
bio = BIO_new_socket(s, BIO_CLOSE);
BIO *BIO_new_socket(int sock, int close_flag);
if (!TEST_ptr(s_to_c_bio = BIO_new_socket(sfd, BIO_NOCLOSE))
|| !TEST_ptr(c_to_s_bio = BIO_new_socket(cfd, BIO_NOCLOSE)))