src/test/run-pass/wait-forked-but-failed-child.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 // pretty-expanded FIXME #23616
  12
  13 #![feature(libc, old_io)]
  14
  15 extern crate libc;
  16
  17 use std::old_io::process::Command;
  18
  19 use libc::funcs::posix88::unistd;
  20
  21 // The output from "ps -A -o pid,ppid,args" should look like this:
  22 //   PID  PPID COMMAND
  23 //     1     0 /sbin/init
  24 //     2     0 [kthreadd]
  25 // ...
  26 //  6076  9064 /bin/zsh
  27 // ...
  28 //  7164  6076 ./spawn-failure
  29 //  7165  7164 [spawn-failure] <defunct>
  30 //  7166  7164 [spawn-failure] <defunct>
  31 // ...
  32 //  7197  7164 [spawn-failure] <defunct>
  33 //  7198  7164 ps -A -o pid,ppid,command
  34 // ...
  35
  36 #[cfg(unix)]
  37 fn find_zombies() {
  38     let my_pid = unsafe { unistd::getpid() };
  39
  40     // http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ps.html
  41     let ps_cmd_output = Command::new("ps").args(&["-A", "-o", "pid,ppid,args"]).output().unwrap();
  42     let ps_output = String::from_utf8_lossy(&ps_cmd_output.output);
  43
  44     for (line_no, line) in ps_output.split('\n').enumerate() {
  45         if 0 < line_no && 0 < line.len() &&
  46            my_pid == line.split(' ').filter(|w| 0 < w.len()).nth(1)
  47                          .expect("1st column should be PPID")
  48                          .parse().ok()
  49                          .expect("PPID string into integer") &&
  50            line.contains("defunct") {
  51             panic!("Zombie child {}", line);
  52         }
  53     }
  54 }
  55
  56 #[cfg(windows)]
  57 fn find_zombies() { }
  58
  59 fn main() {
  60     let too_long = format!("/NoSuchCommand{:0300}", 0u8);
  61
  62     let _failures = (0..100).map(|_| {
  63         let cmd = Command::new(&too_long);
  64         let failed = cmd.spawn();
  65         assert!(failed.is_err(), "Make sure the command fails to spawn(): {:?}", cmd);
  66         failed
  67     }).collect::<Vec<_>>();
  68
  69     find_zombies();
  70     // then _failures goes out of scope
  71 }