tests/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 // ignore-fuchsia no 'ps'
   6
   7 #![feature(rustc_private)]
   8
   9 extern crate libc;
  10
  11 use std::process::Command;
  12
  13 // The output from "ps -A -o pid,ppid,args" should look like this:
  14 //   PID  PPID COMMAND
  15 //     1     0 /sbin/init
  16 //     2     0 [kthreadd]
  17 // ...
  18 //  6076  9064 /bin/zsh
  19 // ...
  20 //  7164  6076 ./spawn-failure
  21 //  7165  7164 [spawn-failure] <defunct>
  22 //  7166  7164 [spawn-failure] <defunct>
  23 // ...
  24 //  7197  7164 [spawn-failure] <defunct>
  25 //  7198  7164 ps -A -o pid,ppid,command
  26 // ...
  27
  28 #[cfg(unix)]
  29 fn find_zombies() {
  30     let my_pid = unsafe { libc::getpid() };
  31
  32     // https://pubs.opengroup.org/onlinepubs/9699919799/utilities/ps.html
  33     let ps_cmd_output = Command::new("ps").args(&["-A", "-o", "pid,ppid,args"]).output().unwrap();
  34     let ps_output = String::from_utf8_lossy(&ps_cmd_output.stdout);
  35
  36     for (line_no, line) in ps_output.split('\n').enumerate() {
  37         if 0 < line_no && 0 < line.len() &&
  38            my_pid == line.split(' ').filter(|w| 0 < w.len()).nth(1)
  39                          .expect("1st column should be PPID")
  40                          .parse().ok()
  41                          .expect("PPID string into integer") &&
  42            line.contains("defunct") {
  43             panic!("Zombie child {}", line);
  44         }
  45     }
  46 }
  47
  48 #[cfg(windows)]
  49 fn find_zombies() { }
  50
  51 fn main() {
  52     let too_long = format!("/NoSuchCommand{:0300}", 0u8);
  53
  54     let _failures = (0..100).map(|_| {
  55         let mut cmd = Command::new(&too_long);
  56         let failed = cmd.spawn();
  57         assert!(failed.is_err(), "Make sure the command fails to spawn(): {:?}", cmd);
  58         failed
  59     }).collect::<Vec<_>>();
  60
  61     find_zombies();
  62     // then _failures goes out of scope
  63 }