process/src/Process.Win.Notify/Program.cs

namespace Geekeey.Extensions.Process.Win.Notify;

internal static class Program
{
	public static int Main(string[] args)
	{
		var processId = uint.Parse(args[0]);
		var signal = uint.Parse(args[1]);

		// detach from the current console, if one is attached to the process.
		Interop.Kernel32.FreeConsole();

		var success =
			// attach to the target process group
			Interop.Kernel32.AttachConsole(processId) &&
			// set to ignore signals on self, so the proper exit code can be return
			Interop.Kernel32.SetConsoleCtrlHandler(null, true) &&
			// send the signal to the process group
			Interop.Kernel32.GenerateConsoleCtrlEvent(signal, 0);

		// we can use the kernel32 GetLastError here, instead of relaying on `Marshal.GetLastWin32Error`, because we
		// are compiling this with a compiler which does not include gc. This can not cause gc pause which tampers with
		// the last error code.
		return success ? 0 : Interop.Kernel32.GetLastError();
	}
}