int sd_rtnl_message_read_u8(sd_rtnl_message *m, unsigned short type, uint8_t *data);
int sd_rtnl_message_read_u16(sd_rtnl_message *m, unsigned short type, uint16_t *data);
int sd_rtnl_message_read_u32(sd_rtnl_message *m, unsigned short type, uint32_t *data);
int sd_rtnl_message_read_u8(sd_rtnl_message *m, unsigned short type, uint8_t *data);
int sd_rtnl_message_read_u16(sd_rtnl_message *m, unsigned short type, uint16_t *data);
int sd_rtnl_message_read_u32(sd_rtnl_message *m, unsigned short type, uint32_t *data);