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# fBufferDirection

The direction for the buffer to send or receive data.

```
uint8_t fBufferDirection;
```

## Discussion

Use the following `DriverKit/IOMemoryDescriptor.h` direction values to populate this field:

- <doc://com.apple.documentation/documentation/kernel/3852596-anonymous/kiomemorydirectionnone>
- <doc://com.apple.documentation/documentation/kernel/3852596-anonymous/kiomemorydirectionin>
- <doc://com.apple.documentation/documentation/kernel/3852596-anonymous/kiomemorydirectionout>
- <doc://com.apple.documentation/documentation/kernel/3852596-anonymous/kiomemorydirectionoutin>
- <doc://com.apple.documentation/documentation/kernel/3852596-anonymous/kiomemorydirectioninout>
- <doc://com.apple.documentation/documentation/kernel/3852596-anonymous/kiomemorydisablecopyonwrite>

---

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