---
title: Cancel_Impl
framework: Kernel
role: symbol
role_heading: Instance Method
platforms: [macOS 12.0+]
path: kernel/ioservicestatenotificationdispatchsource/3753350-cancel_impl
---

# Cancel_Impl

## Declaration

```occ
kern_return_t Cancel_Impl(IODispatchSourceCancelHandler handler);
```