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

# open_close_fcn_t

## Declaration

```occ
typedef int (dev_t, int, int, struct proc *) open_close_fcn_t;
```