rust/tests/ui/process/issue-14456.rs

// run-pass
#![allow(unused_mut)]
// ignore-emscripten no processes
// ignore-sgx no processes

use std::env;
use std::io::prelude::*;
use std::io;
use std::process::{Command, Stdio};

fn main() {
    let args: Vec<String> = env::args().collect();
    if args.len() > 1 && args[1] == "child" {
        return child()
    }

    test();
}

fn child() {
    writeln!(&mut io::stdout(), "foo").unwrap();
    writeln!(&mut io::stderr(), "bar").unwrap();
    let mut stdin = io::stdin();
    let mut s = String::new();
    stdin.lock().read_line(&mut s).unwrap();
    assert_eq!(s.len(), 0);
}

fn test() {
    let args: Vec<String> = env::args().collect();
    let mut p = Command::new(&args[0]).arg("child")
                                     .stdin(Stdio::piped())
                                     .stdout(Stdio::piped())
                                     .stderr(Stdio::piped())
                                     .spawn().unwrap();
    assert!(p.wait().unwrap().success());
}