sys/kern/kern_sendfile.c

949 	struct sf_hdtr hdtr;
965 	if (uap->hdtr != NULL) {
966 		error = copyin(uap->hdtr, &hdtr, sizeof(hdtr));
969 		if (hdtr.headers != NULL) {
970 			error = copyinuio(hdtr.headers, hdtr.hdr_cnt,
988 		if (hdtr.trailers != NULL) {
989 			error = copyinuio(hdtr.trailers, hdtr.trl_cnt,
1022  *       struct sf_hdtr *hdtr, off_t *sbytes, int flags)
1046 	args.hdtr = uap->hdtr;