rust/src/test/run-pass/wait-forked-but-failed-child.rs

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// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
extern crate libc;
use std::io::process::Command;
use std::iter::IteratorExt;
use std::str::from_str;
use libc::funcs::posix88::unistd;
// The output from "ps -A -o pid,ppid,args" should look like this:
// PID PPID COMMAND
// 1 0 /sbin/init
// 2 0 [kthreadd]
// ...
// 6076 9064 /bin/zsh
// ...
// 7164 6076 ./spawn-failure
// 7165 7164 [spawn-failure] <defunct>
// 7166 7164 [spawn-failure] <defunct>
// ...
// 7197 7164 [spawn-failure] <defunct>
// 7198 7164 ps -A -o pid,ppid,command
// ...
#[cfg(unix)]
fn find_zombies() {
let my_pid = unsafe { unistd::getpid() };
// http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ps.html
let ps_cmd_output = Command::new("ps").args(&["-A", "-o", "pid,ppid,args"]).output().unwrap();
let ps_output = String::from_utf8_lossy(ps_cmd_output.output.as_slice());
for (line_no, line) in ps_output.split('\n').enumerate() {
if 0 < line_no && 0 < line.len() &&
my_pid == from_str(line.split(' ').filter(|w| 0 < w.len()).nth(1)
.expect("1st column should be PPID")
).expect("PPID string into integer") &&
line.contains("defunct") {
panic!("Zombie child {}", line);
}
}
}
#[cfg(windows)]
fn find_zombies() { }
fn main() {
let too_long = format!("/NoSuchCommand{:0300}", 0u8);
let _failures = Vec::from_fn(100, |_i| {
let cmd = Command::new(too_long.as_slice());
let failed = cmd.spawn();
assert!(failed.is_err(), "Make sure the command fails to spawn(): {}", cmd);
failed
});
find_zombies();
// then _failures goes out of scope
}