---
title: MTLIOErrorDomain
framework: metal
role: symbol
role_heading: Global Variable
path: metal/mtlioerrordomain
---

# MTLIOErrorDomain

The domain for input/output command queue errors.

## Declaration

```swift
let MTLIOErrorDomain: String
```

## See Also

### I/O command buffers

- [MTLIOCommandBuffer](metal/mtliocommandbuffer.md)
- [MTLIOFileHandle](metal/mtliofilehandle.md)
- [MTLIOCommandBufferHandler](metal/mtliocommandbufferhandler.md)
- [MTLIOStatus](metal/mtliostatus.md)
- [MTLIOError.Code](metal/mtlioerror-swift.struct/code.md)