src/test/ui/wait-forked-but-failed-child.rs

   1 // run-pass
   2 // ignore-emscripten no processes
   3 // ignore-sgx no processes
   4 // ignore-vxworks no 'ps'
   5
   6 #![feature(rustc_private)]
   7
   8 extern crate libc;
   9
  10 use std::process::Command;
  11
  12 // The output from "ps -A -o pid,ppid,args" should look like this:
  13 //   PID  PPID COMMAND
  14 //     1     0 /sbin/init
  15 //     2     0 [kthreadd]
  16 // ...
  17 //  6076  9064 /bin/zsh
  18 // ...
  19 //  7164  6076 ./spawn-failure
  20 //  7165  7164 [spawn-failure] <defunct>
  21 //  7166  7164 [spawn-failure] <defunct>
  22 // ...
  23 //  7197  7164 [spawn-failure] <defunct>
  24 //  7198  7164 ps -A -o pid,ppid,command
  25 // ...
  26
  27 #[cfg(unix)]
  28 fn find_zombies() {
  29     let my_pid = unsafe { libc::getpid() };
  30
  31     // https://pubs.opengroup.org/onlinepubs/9699919799/utilities/ps.html
  32     let ps_cmd_output = Command::new("ps").args(&["-A", "-o", "pid,ppid,args"]).output().unwrap();
  33     let ps_output = String::from_utf8_lossy(&ps_cmd_output.stdout);
  34
  35     for (line_no, line) in ps_output.split('\n').enumerate() {
  36         if 0 < line_no && 0 < line.len() &&
  37            my_pid == line.split(' ').filter(|w| 0 < w.len()).nth(1)
  38                          .expect("1st column should be PPID")
  39                          .parse().ok()
  40                          .expect("PPID string into integer") &&
  41            line.contains("defunct") {
  42             panic!("Zombie child {}", line);
  43         }
  44     }
  45 }
  46
  47 #[cfg(windows)]
  48 fn find_zombies() { }
  49
  50 fn main() {
  51     let too_long = format!("/NoSuchCommand{:0300}", 0u8);
  52
  53     let _failures = (0..100).map(|_| {
  54         let mut cmd = Command::new(&too_long);
  55         let failed = cmd.spawn();
  56         assert!(failed.is_err(), "Make sure the command fails to spawn(): {:?}", cmd);
  57         failed
  58     }).collect::<Vec<_>>();
  59
  60     find_zombies();
  61     // then _failures goes out of scope
  62 }