Can XPC shared memory be used if the app & extension is using the NSXPCConnection instead of the XPC Services API?
Yes. In 10.14 and later you can transport arbitrary low-level XPC types across
-setXPCType:forSelector:argumentIndex:ofReply:. However, it’s possible to do this on older systems as well: The trick is to use the Posix shared memory API (see the
shm_open man page), which works in terms of file descriptors. You can then wrap that file descriptor in an
NSFileHandle, which is XPC transportable.
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