err = syscall.FlushFileBuffers(syscall.Handle(out.f.Fd()))
	if err != nil {
		Exitf("FlushFileBuffers failed: %v", err)
	}
	err = syscall.UnmapViewOfFile(uintptr(unsafe.Pointer(&out.buf[0])))
	out.buf = nil
	if err != nil {
		Exitf("UnmapViewOfFile failed: %v", err)
	}

	}
	// need to remember addr and h for unmapping
	return Data{f, unsafe.Slice((*byte)(unsafe.Pointer(addr)), size), h}, nil
}

func munmapFile(d Data) error {
	err := windows.UnmapViewOfFile(uintptr(unsafe.Pointer(&d.Data[0])))
	x, ok := d.Windows.(windows.Handle)
	if ok {
		windows.CloseHandle(x)
	}
	d.f.Close()
	return err

	// os.File.Close may fail due to I/O errors, but we still want to delete
	// the temporary file.
	var errs []error
	errs = append(errs,
		syscall.UnmapViewOfFile(uintptr(unsafe.Pointer(&m.region[0]))),
		syscall.CloseHandle(m.sys.mapObj),
		m.f.Close())
	if m.removeOnClose {
		errs = append(errs, os.Remove(m.f.Name()))
	}
	for _, err := range errs {
		if err != nil {

	procSetHandleInformation               = modkernel32.NewProc("SetHandleInformation")
	procTerminateProcess                   = modkernel32.NewProc("TerminateProcess")
	procUnmapViewOfFile                    = modkernel32.NewProc("UnmapViewOfFile")
	procUpdateProcThreadAttribute          = modkernel32.NewProc("UpdateProcThreadAttribute")
	procVirtualLock                        = modkernel32.NewProc("VirtualLock")

//sys	MapViewOfFile(handle Handle, access uint32, offsetHigh uint32, offsetLow uint32, length uintptr) (addr uintptr, err error)
//sys	UnmapViewOfFile(addr uintptr) (err error)
//sys	FlushViewOfFile(addr uintptr, length uintptr) (err error)
//sys	VirtualLock(addr uintptr, length uintptr) (err error)
//sys	VirtualUnlock(addr uintptr, length uintptr) (err error)

	procUnlockFileEx                                         = modkernel32.NewProc("UnlockFileEx")
	procUnmapViewOfFile                                      = modkernel32.NewProc("UnmapViewOfFile")
	procUpdateProcThreadAttribute                            = modkernel32.NewProc("UpdateProcThreadAttribute")
	procVirtualAlloc                                         = modkernel32.NewProc("VirtualAlloc")

//sys	MapViewOfFile(handle Handle, access uint32, offsetHigh uint32, offsetLow uint32, length uintptr) (addr uintptr, err error)
//sys	UnmapViewOfFile(addr uintptr) (err error)
//sys	FlushViewOfFile(addr uintptr, length uintptr) (err error)
//sys	VirtualLock(addr uintptr, length uintptr) (err error)
//sys	VirtualUnlock(addr uintptr, length uintptr) (err error)

		{"Umask", Func, 0},
		{"Uname", Func, 0},
		{"Undelete", Func, 0},
		{"UnixCredentials", Func, 0},
		{"UnixRights", Func, 0},
		{"Unlink", Func, 0},
		{"Unlinkat", Func, 0},
		{"UnmapViewOfFile", Func, 0},
		{"Unmount", Func, 0},
		{"Unsetenv", Func, 4},
		{"Unshare", Func, 0},
		{"UserInfo10", Type, 0},
		{"UserInfo10.Comment", Field, 0},
		{"UserInfo10.FullName", Field, 0},

pkg syscall (windows-386), func TransmitFile(Handle, Handle, uint32, uint32, *Overlapped, *TransmitFileBuffers, uint32) error
pkg syscall (windows-386), func UTF16ToString([]uint16) string
pkg syscall (windows-386), func UnmapViewOfFile(uintptr) error
pkg syscall (windows-386), func VirtualLock(uintptr, uintptr) error
pkg syscall (windows-386), func VirtualUnlock(uintptr, uintptr) error
pkg syscall (windows-386), func WSACleanup() error