untrace (PGconn)

    /*
     * 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;
    }