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# CFStreamErrorDomain

Defines constants for values returned in the domain field of the `CFStreamError` structure.

```
enum CFStreamErrorDomain
```

## Overview

These constants indicate how the error code in the `error` field in the [`CFStreamError`](/documentation/CoreFoundation/CFStreamError) structure should be interpreted.

## Topics

### Constants

[`CFStreamErrorDomain.custom`](/documentation/CoreFoundation/CFStreamErrorDomain/custom)

The error code is a custom error code.

[`CFStreamErrorDomain.POSIX`](/documentation/CoreFoundation/CFStreamErrorDomain/POSIX)

The error code is an error code defined in `errno.h`.

[`CFStreamErrorDomain.macOSStatus`](/documentation/CoreFoundation/CFStreamErrorDomain/macOSStatus)

The error is an OSStatus value defined in `MacErrors.h`.


---

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