process_kill_on_drop.rs

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#![cfg(all(unix, feature = "process"))]

#![warn(rust_2018_idioms)]

use std::io::ErrorKind;

use std::process::Stdio;

use std::time::Duration;

use tokio::io::AsyncReadExt;

use tokio::process::Command;

use tokio::time::sleep;

use tokio_test::assert_ok;

#[tokio::test]

async fn kill_on_drop() {

    let mut cmd = Command::new("bash");

    cmd.args([

        "-c",

       # Fork another child that won't get killed

       sh -c 'sleep 1; echo child ran' &

       disown -a

       # Await our death

       sleep 5

       echo hello from beyond the grave

",

]);

    let e = cmd.kill_on_drop(true).stdout(Stdio::piped()).spawn();

    if e.is_err() && e.as_ref().unwrap_err().kind() == ErrorKind::NotFound {

        println!("bash not available; skipping test");

        return;

    let mut child = e.unwrap();

    sleep(Duration::from_secs(2)).await;

    let mut out = child.stdout.take().unwrap();

    drop(child);

    let mut msg = String::new();

    assert_ok!(out.read_to_string(&mut msg).await);

    assert_eq!("child ran\n", msg);