func (c *ExecCollector) prepareSocket() (*netlink.NetlinkSocket, error) {
	ns, err := netlink.NewNetlinkSocket(netlink.CONNECTOR, netlink.CN_IDX_PROC)
	if err != nil {
		return nil, fmt.Errorf("create netlink socket: %v", err)
	}
	req := netlink.NewNetlinkRequest()
	{
		msg := netlink.NewCnMsg()
		req.AddData(msg)
		op := netlink.PROC_CN_MCAST_LISTEN
		req.AddData(&op)
	}
	err = ns.Send(req)
	if err != nil {
		return nil, fmt.Errorf("Exec: %v", err)
	}
	go func() {
		<-c.shutdown
		ns.Close()
	}()
	return ns, nil
}