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// Copyright Epic Games, Inc. All Rights Reserved.
#pragma once
#include <zencore/process.h>
#include <zencore/zencore.h>
#include <functional>
#include <memory>
namespace asio {
class io_context;
}
namespace zen {
/// Async process exit watcher.
///
/// Uses platform-specific mechanisms for scalable, non-polling exit detection:
/// Linux: pidfd_open() + asio::posix::stream_descriptor
/// Windows: asio::windows::object_handle
/// macOS: kqueue EVFILT_PROC/NOTE_EXIT + asio::posix::stream_descriptor
///
/// The callback is invoked exactly once when the process exits, posted to the
/// io_context. Call Cancel() to suppress the callback.
class ProcessExitWatcher
{
public:
explicit ProcessExitWatcher(asio::io_context& IoContext);
~ProcessExitWatcher();
ProcessExitWatcher(const ProcessExitWatcher&) = delete;
ProcessExitWatcher& operator=(const ProcessExitWatcher&) = delete;
/// Begin watching the given process. The callback is posted to the io_context
/// when the process exits. Only one Watch() may be active at a time.
void Watch(const ProcessHandle& Handle, std::function<void(int ExitCode)> OnExit);
/// Cancel any outstanding watch. The callback will not be invoked after this
/// returns. Safe to call if no watch is active.
void Cancel();
private:
struct Impl;
std::unique_ptr<Impl> m_Impl;
};
} // namespace zen
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