---
title: iff_detached_func
framework: Kernel
role: symbol
role_heading: Type Alias
platforms: [macOS 10.4+]
path: kernel/iff_detached_func
---

# iff_detached_func

## Declaration

```occ
typedef void (*iff_detached_func)(void *cookie, ifnet_t interface);
```

## Parameters

- `cookie`: The cookie specified when this filter was attached.
- `interface`: The interface this filter was detached from.

## Discussion

Discussion iff_detached_func is called to notify the filter that it has been detached from an interface. This is the last call to the filter that will be made. A filter may be detached if the interface is detached or the detach filter function is called. In the case that the interface is being detached, your filter's event function will be called with the interface detaching event before the your detached function will be called.