ptools 0.2.23

Utilities for inspecting Linux processes
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//
//   Copyright (c) 2026 Basil Crow
//
//   Licensed under the Apache License, Version 2.0 (the "License");
//   you may not use this file except in compliance with the License.
//   You may obtain a copy of the License at
//
//       http://www.apache.org/licenses/LICENSE-2.0
//
//   Unless required by applicable law or agreed to in writing, software
//   distributed under the License is distributed on an "AS IS" BASIS,
//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//   See the License for the specific language governing permissions and
//   limitations under the License.
//

use std::env;
use std::fs::File;
use std::process::Command;
use std::thread;
use std::time::Duration;

use nix::unistd::getppid;

fn main() {
    let args: Vec<String> = env::args().collect();

    if args.get(1).map(String::as_str) == Some("--child") {
        let original_ppid = getppid();
        let ready_child_file = env::var("PTOOLS_TEST_READY_CHILD_FILE")
            .expect("PTOOLS_TEST_READY_CHILD_FILE must be set");
        File::create(ready_child_file).expect("failed to create ready child file");

        while getppid() == original_ppid {
            thread::sleep(Duration::from_millis(100));
        }
        return;
    }

    args.get(1).expect("missing parent arg");
    let child_arg = args.get(2).expect("missing child arg");
    let ready_file =
        env::var("PTOOLS_TEST_READY_FILE").expect("PTOOLS_TEST_READY_FILE must be set");
    let ready_child_file =
        env::var("PTOOLS_TEST_READY_CHILD_FILE").expect("PTOOLS_TEST_READY_CHILD_FILE must be set");

    #[allow(clippy::zombie_processes)]
    let _child = Command::new(&args[0])
        .arg("--child")
        .arg(child_arg)
        .env("PTOOLS_TEST_READY_FILE", ready_file.as_str())
        .env("PTOOLS_TEST_READY_CHILD_FILE", ready_child_file)
        .spawn()
        .expect("failed to spawn child process");

    File::create(ready_file).expect("failed to create parent ready file");

    loop {
        thread::sleep(Duration::from_millis(100));
    }
}