---
title: addSubunit
framework: kernel
role: symbol
role_heading: Instance Method
path: kernel/iofirewireavctargetspace/1571586-addsubunit
---

# addSubunit

## Declaration

```occ
virtual IOReturn addSubunit(IOFireWireAVCProtocolUserClient *userClient, IOFireWireAVCSubunitPlugHandlerCallback callBack, OSAsyncReference64 asyncRef, UInt32 subunitType, UInt32 numSourcePlugs, UInt32 numDestPlugs, uint64_t userCallBack, uint64_t userRefCon, UInt32 *subUnitID);
```