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# CFFileDescriptorCreate(_:_:_:_:_:)

Creates a new CFFileDescriptor.

```
func CFFileDescriptorCreate(_ allocator: CFAllocator!, _ fd: CFFileDescriptorNativeDescriptor, _ closeOnInvalidate: Bool, _ callout: CFFileDescriptorCallBack!, _ context: UnsafePointer<CFFileDescriptorContext>!) -> CFFileDescriptor!
```

## Parameters

`allocator`

The allocator to use to allocate memory for the new file descriptor object. Pass `NULL` or kCFAllocatorDefault to use the current default allocator.

`fd`

The file descriptor for the new CFFileDescriptor.

`closeOnInvalidate`

`true` if the new CFFileDescriptor should close `fd` when it is invalidated, otherwise `false`.

`callout`

The CFFileDescriptorCallBack for the new CFFileDescriptor.

`context`

Contextual information for the new CFFileDescriptor.

## Return Value

A new CFFileDescriptor or `NULL` if there was a problem creating the object. Ownership follows the [The Create Rule](https://developer.apple.com/library/archive/documentation/CoreFoundation/Conceptual/CFMemoryMgmt/Concepts/Ownership.html#//apple_ref/doc/uid/20001148-103029).

## See Also

[`CFFileDescriptorGetContext`](/documentation/CoreFoundation/CFFileDescriptorGetContext(_:_:))

Gets the context for a given CFFileDescriptor.

[`CFFileDescriptorInvalidate`](/documentation/CoreFoundation/CFFileDescriptorInvalidate(_:))

Invalidates a CFFileDescriptor object.


---

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