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Now that Travis CI has ended their free tier, CI should migrate to GitHub Actions. The actions-rs quickstart example is probably a good place to start.

running 1 test
test test_process_pid ... FAILED

failures:

---- test_process_pid stdout ----
thread 'test_process_pid' panicked at 'assertion failed: `(left == right)`
  left: `0`,
 right: `5`', tests/test.rs:39:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

Instead of KERN_SUCCESS, KERN_FAILURE is returned. I tried again codesigning the binary with both com.apple.security.get-task-allow and com.apple.security.cs.debugger as well as running it as root, for the same result.

I left some TODOs in the code for this. mach_msg has some options to receive auditing information in the mach message trailer, and you can call audit_token_to_pid on part of that to reliably determine which process sent the message. We should use this to verify that the message came from the child we spawned.