Split the service and server functions

TGS.Server/ProcessExtension.cs

@@ -0,0 +1,72 @@
+using System;
+using System.Diagnostics;
+using System.Runtime.InteropServices;
+
+namespace TGS.Server
+{
+	/// <summary>
+	/// Helpers to <see cref="Suspend(Process)"/>ing and <see cref="Resume(Process)"/> a <see cref="Process"/>. Lightly massaged code from https://stackoverflow.com/a/13109774. Documentation linked from MSDN on 20/10/2017
+	/// </summary>
+	static class ProcessExtension
+	{
+		/// <summary>
+		/// https://msdn.microsoft.com/en-us/library/windows/desktop/ms686769(v=vs.85).aspx
+		/// </summary>
+		enum ThreadAccess : int
+		{
+			SUSPEND_RESUME = (0x0002),
+		}
+		/// <summary>
+		/// https://msdn.microsoft.com/en-us/library/windows/desktop/ms684335(v=vs.85).aspx
+		/// </summary>
+		[DllImport("kernel32.dll")]
+		static extern IntPtr OpenThread(ThreadAccess dwDesiredAccess, bool bInheritHandle, uint dwThreadId);
+		/// <summary>
+		/// https://msdn.microsoft.com/en-us/library/windows/desktop/ms724211(v=vs.85).aspx
+		/// </summary>
+		[DllImport("kernel32.dll")]
+		static extern bool CloseHandle(IntPtr hObject);
+		/// <summary>
+		/// https://msdn.microsoft.com/en-us/library/windows/desktop/ms686345(v=vs.85).aspx
+		/// </summary>
+		[DllImport("kernel32.dll")]
+		static extern uint SuspendThread(IntPtr hThread);
+		/// <summary>
+		/// https://msdn.microsoft.com/en-us/library/windows/desktop/ms685086(v=vs.85).aspx
+		/// </summary>
+		[DllImport("kernel32.dll")]
+		static extern int ResumeThread(IntPtr hThread);
+
+		/// <summary>
+		/// Suspends all threads for a running <see cref="Process"/>
+		/// </summary>
+		/// <param name="process">The <see cref="Process"/> to suspend</param>
+		public static void Suspend(this Process process)
+		{
+			foreach (ProcessThread thread in process.Threads)
+			{
+				var pOpenThread = OpenThread(ThreadAccess.SUSPEND_RESUME, false, (uint)thread.Id);
+				if (pOpenThread == IntPtr.Zero)
+					continue;
+				SuspendThread(pOpenThread);
+				CloseHandle(pOpenThread);
+			}
+		}
+
+		/// <summary>
+		/// Resumes all threads for a running <see cref="Process"/>
+		/// </summary>
+		/// <param name="process">The <see cref="Process"/> to suspend</param>
+		public static void Resume(this Process process)
+		{
+			foreach (ProcessThread thread in process.Threads)
+			{
+				var pOpenThread = OpenThread(ThreadAccess.SUSPEND_RESUME, false, (uint)thread.Id);
+				if (pOpenThread == IntPtr.Zero)
+					continue;
+				ResumeThread(pOpenThread);
+				CloseHandle(pOpenThread);
+			}
+		}
+	}
+}