---
title: fCommandChain
framework: kernel
role: pseudoSymbol
path: kernel/iocommand/fcommandchain
---

# fCommandChain

## Declaration

```occ
queue_chain_t fCommandChain;
```

## Overview

Overview This variable is used by the current 'owner' to queue the command. During the life cycle of a command it moves through a series of queues. This is the queue pointer for it. Only valid while 'ownership' is clear. For instance a IOCommandPool uses this pointer to maintain its list of free commands. May be manipulated using the kern/queue.h macros