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

# ioctl_fcn_t

## Declaration

```occ
typedef int (dev_t, u_long, caddr_t, int, struct proc *) ioctl_fcn_t;
```