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Re:Rumors of Cmd’s death have been greatly exaggerated by justincormack on Thursday January 05, 2017 @01:13PM (#13329680)
One day the capsicum port to Linux might happen, but in the meantime FreeBSD does have it, so has file descriptors for processes.
Re:Rumors of Cmd’s death have been greatly exaggerated by nimish on Thursday January 05, 2017 @03:27PM (#13331038)
And signals, timers and events (inc semaphores) have non-standard fd versions too, but they've been bolted on and you need all kinds of new syscalls to make them work right.

Plan 9 did it right if you want to go "everything is a file"