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::io::Write;
use std::thread;
use std::time::Duration;

use nix::errno::Errno;
use nix::sys::socket::socket;
use nix::sys::socket::AddressFamily;
use nix::sys::socket::SockFlag;
use nix::sys::socket::SockType;

fn main() {
    let signal_path =
        env::var("PTOOLS_TEST_READY_FILE").expect("PTOOLS_TEST_READY_FILE must be set");
    let status_path = env::args()
        .nth(1)
        .expect("status file path argument must be provided");

    let alg_socket = match socket(
        AddressFamily::Alg,
        SockType::SeqPacket,
        SockFlag::empty(),
        None,
    ) {
        Ok(fd) => Some(fd),
        Err(Errno::EAFNOSUPPORT | Errno::EPROTONOSUPPORT) => None,
        Err(e) => panic!("failed to create AF_ALG socket: {e}"),
    };
    let alg_supported = alg_socket.is_some();
    let _alg_socket = alg_socket;

    let mut status_file = File::create(status_path).expect("failed to create status file");
    if alg_supported {
        writeln!(status_file, "supported").expect("failed to write status");
    } else {
        writeln!(status_file, "unsupported").expect("failed to write status");
    }

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

    // Keep the socket alive until killed by test harness.
    loop {
        thread::sleep(Duration::from_millis(100));
    }
}