extraBytes := d.idx - d.length
		n -= int(extraBytes)
		if n < 0 {
			n = 0
		}
		err = io.EOF
	}
	return n, err
}

func (d *DummyDataGen) Seek(offset int64, whence int) (int64, error) {
	switch whence {
	case io.SeekStart:
		if offset < 0 {
			return 0, errors.New("Invalid offset")
		}
		d.idx = offset
	case io.SeekCurrent:
		if d.idx+offset < 0 {
			return 0, errors.New("Invalid offset")

// Seek implements the [io.Seeker] interface.
func (r *Reader) Seek(offset int64, whence int) (int64, error) {
	r.prevRune = -1
	var abs int64
	switch whence {
	case io.SeekStart:
		abs = offset
	case io.SeekCurrent:
		abs = r.i + offset
	case io.SeekEnd:
		abs = int64(len(r.s)) + offset
	default:
		return 0, errors.New("bytes.Reader.Seek: invalid whence")
	}
	if abs < 0 {

		offset:        0,
		reader:        nil,
	}
}

// Seek call to implement io.Seeker
func (rsc *ObjectReadSeekCloser) Seek(offset int64, whence int) (int64, error) {
	// fmt.Printf("actual: %v offset: %v (%v) whence: %v\n", rsc.size, offset, rsc.offset, whence)
	switch whence {
	case io.SeekStart:
		rsc.offset = offset
	case io.SeekCurrent:
		rsc.offset += offset
	case io.SeekEnd:
		rsc.offset = rsc.size + offset

	default:
		return nil, &os.PathError{
			Op:   "open",
			Path: path,
			Err:  syscall.EINVAL,
		}
	}

	lock := syscall.Flock_t{
		Start:  0,
		Len:    0,
		Pid:    0,
		Type:   lockType,
		Whence: 0,
	}

	f, err := os.OpenFile(path, flag, perm)
	if err != nil {
		return nil, err
	}

	if err = syscall.FcntlFlock(f.Fd(), rlockType, &lock); err != nil {
		f.Close()
		if err == syscall.EAGAIN {

	return len(b), nil
}

func (f *testFile) Seek(pos int64, whence int) (int64, error) {
	if pos == 0 && whence == io.SeekCurrent {
		return f.pos, nil
	}
	if len(f.ops) == 0 {
		return 0, errors.New("unexpected Seek operation")
	}
	s, ok := f.ops[0].(int64)
	if !ok {
		return 0, errors.New("unexpected Seek operation")
	}

	if s != pos || whence != io.SeekCurrent {

pkg syscall (linux-386), type Flock_t struct, Pid int32
pkg syscall (linux-386), type Flock_t struct, Start int64
pkg syscall (linux-386), type Flock_t struct, Type int16
pkg syscall (linux-386), type Flock_t struct, Whence int16
pkg syscall (linux-386-cgo), func FcntlFlock(uintptr, int, *Flock_t) error
pkg syscall (linux-386-cgo), func SendmsgN(int, []uint8, []uint8, Sockaddr, int) (int, error)
pkg syscall (linux-386-cgo), type Flock_t struct

pkg syscall (freebsd-386-cgo), type Flock_t struct, Sysid int32
pkg syscall (freebsd-386-cgo), type Flock_t struct, Type int16
pkg syscall (freebsd-386-cgo), type Flock_t struct, Whence int16
pkg syscall (freebsd-386-cgo), type Fsid struct
pkg syscall (freebsd-386-cgo), type Fsid struct, Val [2]int32
pkg syscall (freebsd-386-cgo), type ICMPv6Filter struct

pkg syscall (netbsd-arm64-cgo), type Flock_t struct, Start int64
pkg syscall (netbsd-arm64-cgo), type Flock_t struct, Type int16
pkg syscall (netbsd-arm64-cgo), type Flock_t struct, Whence int16
pkg syscall (netbsd-arm64-cgo), type Fsid struct
pkg syscall (netbsd-arm64-cgo), type Fsid struct, X__fsid_val [2]int32
pkg syscall (netbsd-arm64-cgo), type ICMPv6Filter struct

pkg syscall (freebsd-arm64), type Flock_t struct, Sysid int32
pkg syscall (freebsd-arm64), type Flock_t struct, Type int16
pkg syscall (freebsd-arm64), type Flock_t struct, Whence int16
pkg syscall (freebsd-arm64), type Fsid struct
pkg syscall (freebsd-arm64), type Fsid struct, Val [2]int32
pkg syscall (freebsd-arm64), type ICMPv6Filter struct

pkg syscall (darwin-386), type Flock_t struct, Pid int32
pkg syscall (darwin-386), type Flock_t struct, Start int64
pkg syscall (darwin-386), type Flock_t struct, Type int16
pkg syscall (darwin-386), type Flock_t struct, Whence int16
pkg syscall (darwin-386), type Fsid struct
pkg syscall (darwin-386), type Fsid struct, Val [2]int32
pkg syscall (darwin-386), type Fstore_t struct
pkg syscall (darwin-386), type Fstore_t struct, Bytesalloc int64