rust - How do I ensure that a spawned Child process is killed if my app panics? -

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i'm writing small test starts daemon process , tests e.g:

let server = command::new("target/debug/server").spawn();  // tests  server.kill();

the typical way fail test panic. unfortunately means kill() never gets invoked , repeated runs of test suite fail, because port taken old process still running.

is there trap function can use ensure child gets killed?

you can put possibly-panicking code closure , give closure catch_panic. catch_panic acts same way scoped or spawned thread on joining. returns result either ok(closureretval) or err(box<any>) if closure panicked.

let res = std::thread::catch_panic(|| {     panic!("blub: {}", 35); }); if let err(err) = res {     let msg: string = *err.downcast().unwrap();     println!("{}", msg); }

playpen


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