# DarwinNotify Functions ## Topics ### Functions [`func notify_is_valid_token(Int32) -> Bool`](/documentation/DarwinNotify/notify_is_valid_token(_:)) [`func notify_register_file_descriptor(UnsafePointer!, UnsafeMutablePointer!, Int32, UnsafeMutablePointer!) -> UInt32`](/documentation/DarwinNotify/notify_register_file_descriptor(_:_:_:_:)) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)