Consume PosixSignal in Microsoft.Extensions.Hosting.Systemd's SystemdLifetime

[eerhardt]

Same change as #55417, but we should make it for Systemd.

runtime/src/libraries/Microsoft.Extensions.Hosting.Systemd/src/SystemdLifetime.cs

Lines 48 to 78 in d38a539

	// systemd sends SIGTERM to stop the service.
	AppDomain.CurrentDomain.ProcessExit += OnProcessExit;
	return Task.CompletedTask;
	}
	private void OnApplicationStarted()
	{
	Logger.LogInformation("Application started. Hosting environment: {EnvironmentName}; Content root path: {ContentRoot}",
	Environment.EnvironmentName, Environment.ContentRootPath);
	SystemdNotifier.Notify(ServiceState.Ready);
	}
	private void OnApplicationStopping()
	{
	Logger.LogInformation("Application is shutting down...");
	SystemdNotifier.Notify(ServiceState.Stopping);
	}
	private void OnProcessExit(object sender, EventArgs e)
	{
	ApplicationLifetime.StopApplication();
	_shutdownBlock.WaitOne();
	// On Linux if the shutdown is triggered by SIGTERM then that's signaled with the 143 exit code.
	// Suppress that since we shut down gracefully. https://github.com/dotnet/aspnetcore/issues/6526
	System.Environment.ExitCode = 0;
	}

We should also figure out how to add real tests, as I don't believe there are any tests for this library, yet. The only test we have:

runtime/src/libraries/Microsoft.Extensions.Hosting.Systemd/tests/UseSystemdTests.cs

Lines 13 to 24 in d38a539

	public void DefaultsToOffOutsideOfService()
	{
	var host = new HostBuilder()
	.UseSystemd()
	.Build();
	using (host)
	{
	var lifetime = host.Services.GetRequiredService<IHostLifetime>();
	Assert.IsType<ConsoleLifetime>(lifetime);
	}
	}

tests that Systemd is "off" when not in a systemd service.

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Issue Details

---

Same change as #55417, but we should make it for Systemd.

runtime/src/libraries/Microsoft.Extensions.Hosting.Systemd/src/SystemdLifetime.cs

Lines 48 to 78 in d38a539

	// systemd sends SIGTERM to stop the service.
	AppDomain.CurrentDomain.ProcessExit += OnProcessExit;
	return Task.CompletedTask;
	}
	private void OnApplicationStarted()
	{
	Logger.LogInformation("Application started. Hosting environment: {EnvironmentName}; Content root path: {ContentRoot}",
	Environment.EnvironmentName, Environment.ContentRootPath);
	SystemdNotifier.Notify(ServiceState.Ready);
	}
	private void OnApplicationStopping()
	{
	Logger.LogInformation("Application is shutting down...");
	SystemdNotifier.Notify(ServiceState.Stopping);
	}
	private void OnProcessExit(object sender, EventArgs e)
	{
	ApplicationLifetime.StopApplication();
	_shutdownBlock.WaitOne();
	// On Linux if the shutdown is triggered by SIGTERM then that's signaled with the 143 exit code.
	// Suppress that since we shut down gracefully. https://github.com/dotnet/aspnetcore/issues/6526
	System.Environment.ExitCode = 0;
	}

We should also figure out how to add real tests, as I don't believe there are any tests for this library, yet. The only test we have:

runtime/src/libraries/Microsoft.Extensions.Hosting.Systemd/tests/UseSystemdTests.cs

Lines 13 to 24 in d38a539

	public void DefaultsToOffOutsideOfService()
	{
	var host = new HostBuilder()
	.UseSystemd()
	.Build();
	using (host)
	{
	var lifetime = host.Services.GetRequiredService<IHostLifetime>();
	Assert.IsType<ConsoleLifetime>(lifetime);
	}
	}

tests that Systemd is "off" when not in a systemd service.

Author:	eerhardt
Assignees:	-
Labels:	area-Infrastructure-libraries, untriaged
Milestone:	-

[eerhardt]

cc @tmds