How to kill a spawned process from a reading thread?

help
1

I have a code like:

let mut child = Command::new(&path_translated)
         .stdout(Stdio::piped())
         .stdin(Stdio::piped())
         .stderr(Stdio::piped())
         .spawn()?;
....
 if let Some(mut stdin) = child.stdin.take() { 
         
       thread::scope(|s| {
            s.spawn(|| {
....
     child.kill().expect("Failed to kill child process");
          }
  if let Some(stderr)  = child.stderr.take() {
             s.spawn(|| {

Since child got moved in the first thread, I can't use it for taking stderr. How can I clone the child, or there is an another technique?

2

Do the take()s first, before the move happens. Also, there's no point in using if let because the Options will always be Some — using unwrap() instead will simplify the code and remove the appearance of handling impossible cases.

let mut child = Command::new(&path_translated)
     .stdout(Stdio::piped())
     .stdin(Stdio::piped())
     .stderr(Stdio::piped())
     .spawn()?;

let stdin = child.stdin.take().unwrap();
let stderr = child.stderr.take().unwrap();
         
thread::scope(|s| {
    s.spawn(|| {
        // ... write stdin
        child.kill().expect("Failed to kill child process");
    });
    s.spawn(|| {
        // ... read stderr
    });
});
1 Like
3

Thanks, it looks like a good suggestion.

4

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