f9/sdk/dart/package-fuchsia_vfs_vfs/PseudoVmoFile/PseudoVmoFile.readOnly.md

# PseudoVmoFile.readOnly constructor




    *[<Null safety>](https://dart.dev/null-safety)*



PseudoVmoFile.readOnly([VmoFn](../../package-fuchsia_vfs_vfs/VmoFn.md) _vmoFn)


<p>Constructor for read-only <a href="../../zircon/Vmo-class.md">Vmo</a></p>
<p>Resulting PseudoVmoFile returns nothing when read as a regular file.</p>



## Implementation

```dart
PseudoVmoFile.readOnly(this._vmoFn) : super.readOnly(() => Uint8List(0));
```