kern_copy_file_range
error = kern_copy_file_range(td, args->fd_in, inoffp, args->fd_out,
error = kern_copy_file_range(td, in, offset, out, NULL, count,
error = kern_copy_file_range(td, uap->infd, inoffp, uap->outfd,
int kern_copy_file_range(struct thread *td, int infd, off_t *inoffp,