MIG, the RPC interface generator, is pretty nasty though, if you want to send anything more complex than scalar parameters. For anyone who doesn't know, Apple

MIG, the RPC interface generator, is pretty nasty though, if you want to send anything more complex than scalar parameters. For anyone who doesn't know, Apple has sort of deprecated raw Mach in favor of XPC, a wrapper API that sends structured data (plist/JSON-like objects, plus capabilities as an additional data type). It's much nicer to use, but sacrifices a bit of performance and, I'd say, somewhat increases the likelihood of security vulnerabilities, because there's more wiggle room to send invalid data. (Until recently, using the accessor methods for the wrong kind of object in the C API, which uses a 'xpc_object_t' type for everything, could cause memory corruption, which was thoroughly demonstrated by Google Project Zero. That's been fixed, but there's still room for logic errors..)