---
title: kCFFileDescriptorReadCallBack
framework: corefoundation
role: symbol
role_heading: Global Variable
path: corefoundation/kcffiledescriptorreadcallback
---

# kCFFileDescriptorReadCallBack

Identifies the read callback.

## Declaration

```swift
var kCFFileDescriptorReadCallBack: CFOptionFlags { get }
```

## See Also

### Constants

- [kCFFileDescriptorWriteCallBack](corefoundation/kcffiledescriptorwritecallback.md)