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)]
find_zombies()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)]
find_zombies()48 fn find_zombies() { }
49
main()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 }
63