---
title: read_write_fcn_t
framework: Kernel
role: symbol
role_heading: Type Alias
platforms: [macOS 10.3+]
path: kernel/read_write_fcn_t
---

# read_write_fcn_t

## Declaration

```occ
typedef int (dev_t, struct uio *, int) read_write_fcn_t;
```