src/test/ui/run-pass/issues/issue-14456.rs

   1 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 // run-pass
  12 // ignore-cloudabi no processes
  13 // ignore-emscripten no processes
  14
  15 use std::env;
  16 use std::io::prelude::*;
  17 use std::io;
  18 use std::process::{Command, Stdio};
  19
  20 fn main() {
  21     let args: Vec<String> = env::args().collect();
  22     if args.len() > 1 && args[1] == "child" {
  23         return child()
  24     }
  25
  26     test();
  27 }
  28
  29 fn child() {
  30     writeln!(&mut io::stdout(), "foo").unwrap();
  31     writeln!(&mut io::stderr(), "bar").unwrap();
  32     let mut stdin = io::stdin();
  33     let mut s = String::new();
  34     stdin.lock().read_line(&mut s).unwrap();
  35     assert_eq!(s.len(), 0);
  36 }
  37
  38 fn test() {
  39     let args: Vec<String> = env::args().collect();
  40     let mut p = Command::new(&args[0]).arg("child")
  41                                      .stdin(Stdio::piped())
  42                                      .stdout(Stdio::piped())
  43                                      .stderr(Stdio::piped())
  44                                      .spawn().unwrap();
  45     assert!(p.wait().unwrap().success());
  46 }