---
title: fRefCon
framework: kernel
role: pseudoSymbol
path: kernel/iodmacommand/private_accessors/frefcon
---

# fRefCon

## Declaration

```occ
void *fRefCon;
```

## Overview

Overview Reference Constant, client defined publicly avialable

## See Also

### Fields

- [fMemory](kernel/iodmacommand/private_accessors/fmemory.md)
- [reserved](kernel/iodmacommand/private_accessors/reserved.md)
- [fOutSeg](kernel/iodmacommand/private_accessors/foutseg.md)
- [fNumSegments](kernel/iodmacommand/private_accessors/fnumsegments.md)
- [fNumAddressBits](kernel/iodmacommand/private_accessors/fnumaddressbits.md)
- [fMaxTransferSize](kernel/iodmacommand/private_accessors/fmaxtransfersize.md)
- [fMaxSegmentSize](kernel/iodmacommand/private_accessors/fmaxsegmentsize.md)
- [fMappingOptions](kernel/iodmacommand/private_accessors/fmappingoptions.md)
- [fBypassMask](kernel/iodmacommand/private_accessors/fbypassmask.md)
- [fAlignMask](kernel/iodmacommand/private_accessors/falignmask.md)
- [fActive](kernel/iodmacommand/private_accessors/factive.md)
- [fMapper](kernel/iodmacommand/private_accessors/fmapper.md)