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