tls_examine_error
error = tls_examine_error("SSL_accept()",
if (rc <= 0 && tls_examine_error("SSL_read()", conn_info->sslptr,
error = tls_examine_error("SSL_read()", c->tls_conn->sslptr,
error = tls_examine_error("SSL_write()",
(void)tls_examine_error("SSL_shutdown()",
error = tls_examine_error("SSL_shutdown()",
error = tls_examine_error("SSL_connect()",
int tls_examine_error(const char *, const SSL *, struct tls_conn_settings *, const int);