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https://github.com/rust-lang/rust
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63 lines
1.7 KiB
Rust
63 lines
1.7 KiB
Rust
// run-pass
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// ignore-emscripten no processes
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// ignore-sgx no processes
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// ignore-vxworks no 'ps'
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// ignore-fuchsia no 'ps'
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#![feature(rustc_private)]
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extern crate libc;
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use std::process::Command;
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// The output from "ps -A -o pid,ppid,args" should look like this:
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// PID PPID COMMAND
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// 1 0 /sbin/init
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// 2 0 [kthreadd]
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// ...
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// 6076 9064 /bin/zsh
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// ...
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// 7164 6076 ./spawn-failure
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// 7165 7164 [spawn-failure] <defunct>
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// 7166 7164 [spawn-failure] <defunct>
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// ...
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// 7197 7164 [spawn-failure] <defunct>
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// 7198 7164 ps -A -o pid,ppid,command
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// ...
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#[cfg(unix)]
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fn find_zombies() {
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let my_pid = unsafe { libc::getpid() };
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// https://pubs.opengroup.org/onlinepubs/9699919799/utilities/ps.html
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let ps_cmd_output = Command::new("ps").args(&["-A", "-o", "pid,ppid,args"]).output().unwrap();
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let ps_output = String::from_utf8_lossy(&ps_cmd_output.stdout);
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for (line_no, line) in ps_output.split('\n').enumerate() {
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if 0 < line_no && 0 < line.len() &&
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my_pid == line.split(' ').filter(|w| 0 < w.len()).nth(1)
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.expect("1st column should be PPID")
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.parse().ok()
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.expect("PPID string into integer") &&
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line.contains("defunct") {
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panic!("Zombie child {}", line);
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}
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}
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}
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#[cfg(windows)]
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fn find_zombies() { }
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fn main() {
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let too_long = format!("/NoSuchCommand{:0300}", 0u8);
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let _failures = (0..100).map(|_| {
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let mut cmd = Command::new(&too_long);
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let failed = cmd.spawn();
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assert!(failed.is_err(), "Make sure the command fails to spawn(): {:?}", cmd);
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failed
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}).collect::<Vec<_>>();
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find_zombies();
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// then _failures goes out of scope
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}
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