int sd_dhcp6_client_stop(sd_dhcp6_client *client);
int sd_dhcp6_client_start(sd_dhcp6_client *client);
int sd_dhcp6_client_attach_event(sd_dhcp6_client *client, sd_event *event,
int sd_dhcp6_client_stop(sd_dhcp6_client *client);
int sd_dhcp6_client_start(sd_dhcp6_client *client);
int sd_dhcp6_client_attach_event(sd_dhcp6_client *client, sd_event *event,