/*
 * call-seq:
 *    conn.untrace() -> nil
 * 
 * Disables the message tracing.
 */
static VALUE
pgconn_untrace(VALUE self)
{
    VALUE trace_stream;
    PQuntrace(get_pgconn(self));
    trace_stream = rb_iv_get(self, "@trace_stream");
    rb_funcall(trace_stream, rb_intern("close"), 0);
    rb_iv_set(self, "@trace_stream", Qnil);
    return Qnil;
}