---
title: CFFileDescriptorCallBack
framework: corefoundation
role: symbol
role_heading: Type Alias
path: corefoundation/cffiledescriptorcallback
---

# CFFileDescriptorCallBack

Defines a structure for a callback for a CFFileDescriptor.

## Declaration

```swift
typealias CFFileDescriptorCallBack = (CFFileDescriptor?, CFOptionFlags, UnsafeMutableRawPointer?) -> Void
```

## See Also

### Data Types

- [CFFileDescriptorNativeDescriptor](corefoundation/cffiledescriptornativedescriptor.md)
- [CFFileDescriptorContext](corefoundation/cffiledescriptorcontext.md)