return errno
}

// Underlying system call writes to newoffset via pointer.
// Implemented in assembly to avoid allocation.
func seek(fd int, offset int64, whence int) (newoffset int64, err Errno)

func Seek(fd int, offset int64, whence int) (newoffset int64, err error) {
	newoffset, errno := seek(fd, offset, whence)
	if errno != 0 {
		return 0, errno
	}
	return newoffset, nil
}

	for i := len(posTable) - 1; i >= 0; i-- {
		lr.Seek(posTable[i])
		err := lr.Next(&line)
		if i == len(posTable)-1 {
			if err != io.EOF {
				t.Fatal("expected io.EOF after seek to end, got", err)
			}
		} else if err != nil {
			t.Fatal("lr.Next after seek to", posTable[i], "failed:", err)
		} else if line != table[i] {
			t.Fatal("lr.Next after seek to", posTable[i], "returned", line, "instead of", table[i])
		}

	if !errors.Is(err, io.ErrUnexpectedEOF) {
		t.Errorf("Expected io.ErrUnexpectedEOF, but got %v", err)
	}
	if written != 5 {
		t.Errorf("Expected written to be '5', but got %v", written)
	}

	f.Seek(0, io.SeekStart)
	r.Seek(0, io.SeekStart)

	written, err = CopyAligned(f, r, *bufp, r.Size(), f)
	if !errors.Is(err, nil) {
		t.Errorf("Expected nil, but got %v", err)
	}
	if written != r.Size() {

    }

    /**
     * Starts writing to the given offset. Can be beyond the current length of the file.
     */
    public DataOutputStream start(long offset) throws IOException {
        file.seek(offset);
        bufferedOutputStream.clear();
        countingOutputStream = new CountingOutputStream(bufferedOutputStream);
        return new DataOutputStream(countingOutputStream);
    }

    /**

	if fh.PointerToSymbolTable == 0 {
		return nil, nil
	}
	if fh.NumberOfSymbols <= 0 {
		return nil, nil
	}
	_, err := r.Seek(int64(fh.PointerToSymbolTable), io.SeekStart)
	if err != nil {
		return nil, fmt.Errorf("fail to seek to symbol table: %v", err)
	}
	c := saferio.SliceCap[COFFSymbol](uint64(fh.NumberOfSymbols))
	if c < 0 {
		return nil, errors.New("too many symbols; file may be corrupt")

	}
	r, err := Open(name)
	if err != nil {
		t.Fatal(err)
	}
	defer r.Close()
	const n = 100
	var execs [n]string
	// First create n executables.
	for i := 0; i < n; i++ {
		// Rewind r.
		if _, err := r.Seek(0, io.SeekStart); err != nil {
			t.Fatal(err)
		}
		name := filepath.Join(t.TempDir(), "test.exe")
		execs[i] = name
		w, err := Create(name)
		if err != nil {
			t.Fatal(err)
		}

	bad := func() (string, error) {
		return "", &fs.PathError{Op: "parse", Path: name, Err: errBuildIDMalformed}
	}

	off := int64(8)
	for {
		if _, err := f.Seek(off, io.SeekStart); err != nil {
			return "", err
		}

		// TODO(iant): Make a debug/ar package, and use it
		// here and in cmd/link.
		var hdr [60]byte
		if _, err := io.ReadFull(f, hdr[:]); err != nil {

func (mb *metricsBlock) getBlockInfo(metrics *Metrics) error {
	dev, err := os.Open(mb.device)
	if err != nil {
		return fmt.Errorf("unable to open device %q: %w", mb.device, err)
	}
	defer dev.Close()

	end, err := dev.Seek(0, io.SeekEnd)
	if err != nil {
		return fmt.Errorf("failed to detect size of %q: %w", mb.device, err)
	}

	metrics.Capacity = resource.NewQuantity(end, resource.BinarySI)

	return nil

        }

        @Override
        public long skip(long count) throws IOException {
            int toSkip = (int) Math.min(count, remaining);
            if (toSkip > 0) {
                file.seek(file.getFilePointer() + toSkip);
                remaining -= toSkip;
            }
            return toSkip;
        }

        @Override
        public int read() throws IOException {

	if r.fileView != nil {
		toread := r.fileView[r.off:]
		if len(toread) < 1 {
			return 0, io.EOF
		}
		rv := toread[0]
		r.off++
		return rv, nil
	}
	return r.rdr.ReadByte()
}

func (r *MReader) Seek(offset int64, whence int) (int64, error) {
	if r.fileView == nil {
		return r.rdr.MustSeek(offset, whence), nil
	}
	switch whence {
	case io.SeekStart:
		r.off = offset
		return offset, nil
	case io.SeekCurrent: