Creates a new runloop source for a given CFFileDescriptor.
- iOS 2.0+
- macOS 10.5+
- tvOS 9.0+
- watchOS 2.0+
- Core Foundation
The allocator to use to allocate memory for the new bag and its storage for values. Pass
NULLor kCFAllocatorDefault to use the current default allocator.
The order for the new run loop (see
Loop Source Create(_: _: _:)
A new runloop source for
NULL if there was a problem creating the object. Ownership follows the The Create Rule.