---
title: io_rate_update_callback_t
framework: Kernel
role: symbol
role_heading: Type Alias
platforms: [macOS 10.10+]
path: kernel/io_rate_update_callback_t
---

# io_rate_update_callback_t

## Declaration

```occ
typedef uint64_t (*io_rate_update_callback_t)(uint64_t, uint64_t, uint64_t, uint64_t, uint64_t);
```