---
title: queryDMACommand
framework: kernel
role: symbol
role_heading: Instance Method
path: kernel/iodmacontroller/1485736-querydmacommand
---

# queryDMACommand

## Declaration

```occ
virtual IOReturn queryDMACommand(UInt32 dmaIndex, IODMACommand **dmaCommand, IOByteCount *transferCount, bool waitForIdle);
```