// Copyright © 2019 The CefSharp Authors. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
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using System;
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using System.Diagnostics;
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using System.Threading.Tasks;
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namespace CefSharp.Internals
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{
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/// <summary>
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/// Monitor the parent process and exit if the parent process closes
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/// before the subprocess. This class is used by the CefSharp.BrowserSubprocess to
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/// self terminate if the parent dies without notifying it to exit.
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/// See https://github.com/cefsharp/CefSharp/issues/2359 for more information.
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/// </summary>
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public static class ParentProcessMonitor
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{
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/// <summary>
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/// Starts a long running task (spawns new thread) used to monitor the parent process
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/// and calls <see cref="Process.Kill"/> if the parent exits unexpectedly (usually result of a crash).
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/// </summary>
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/// <param name="parentProcessId">process Id of the parent application</param>
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public static void StartMonitorTask(int parentProcessId)
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{
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Task.Factory.StartNew(() => AwaitParentProcessExit(parentProcessId), TaskCreationOptions.LongRunning);
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}
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private static async void AwaitParentProcessExit(int parentProcessId)
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{
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try
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{
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var parentProcess = Process.GetProcessById(parentProcessId);
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parentProcess.WaitForExit();
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}
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catch (Exception e)
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{
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//main process probably died already
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Debug.WriteLine(e);
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}
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await Task.Delay(1000); //wait a bit before exiting
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Debug.WriteLine("BrowserSubprocess shutting down forcibly.");
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Process.GetCurrentProcess().Kill();
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}
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}
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}
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