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NSXPCConnection has no idea how to serialise the name field. It does seem to be able to serialize the name field, but only the first struct in the array gets serialized. because NSXPCConnection has no idea how long that array is I was also not expecting it to work due to the same reason, but what does the documentation mean by C structures and arrays containing only the types listed above as acceptable parameters for methods and reply blocks? You have a few options here: For simple structs, I am using JSON to serialize/deserialize as I am not too familiar with Objective-C. Would any of these options help with function pointers? For more context, I am working on porting an application to Apple Silicon, but don't have the source code for some decade-old C libraries. So creating an XPC service that loads those libraries under Rosetta while the rest of the app runs natively on Apple Silicon. Some APIs in the library return some weird types involving pointers like a linked list where each node is itself a list of function pointers. I’d appreciate you filing a bug about that Filed FB9991036. To what end? Ideally for the lifetime of the application. The XPC service needs to run as long as the app is running and maintain state, the list of function pointers.