---
title: kdp_callout_fn_t
framework: Kernel
role: symbol
role_heading: Type Alias
platforms: [macOS 10.5+]
path: kernel/kdp_callout_fn_t
---

# kdp_callout_fn_t

## Declaration

```occ
typedef void (*kdp_callout_fn_t)(void *arg, kdp_event_t event);
```