void *optval, unsigned int *optlen);
int rfid_layer2_setopt(struct rfid_layer2_handle *ph, int optname,
const void *optval, unsigned int optlen);
void *optval, unsigned int *optlen);
int rfid_layer2_setopt(struct rfid_layer2_handle *ph, int optname,
const void *optval, unsigned int optlen);