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::thread;
use std::time::Duration;

use nix::fcntl::OFlag;
use nix::sys::epoll::Epoll;
use nix::sys::epoll::EpollCreateFlags;
use nix::sys::epoll::EpollEvent;
use nix::sys::epoll::EpollFlags;
use nix::unistd::pipe2;

fn main() {
    let signal_path =
        env::var("PTOOLS_TEST_READY_FILE").expect("PTOOLS_TEST_READY_FILE must be set");

    let (readfd, _writefd) = pipe2(OFlag::O_CLOEXEC | OFlag::O_NONBLOCK).unwrap();

    let epoll = Epoll::new(EpollCreateFlags::empty()).unwrap();
    let event = EpollEvent::new(EpollFlags::EPOLLIN, 0);
    epoll.add(&readfd, event).unwrap();

    // Signal parent process (the test process) that this process is ready to be observed by the
    // ptool being tested.
    File::create(signal_path).unwrap();

    // Wait for the parent to finish running the ptool and then kill us.
    loop {
        thread::sleep(Duration::from_millis(100));
    }
}