Reference clean up

Ntp.System/Ntp.System.csproj

@@ -42,6 +42,7 @@
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="ShellCommand.cs" />
     <Compile Include="InterLock.cs" />
+    <Compile Include="ProcessInfo.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <ItemGroup>

Ntp.System/ProcessInfo.cs

@@ -0,0 +1,44 @@
+//
+// ProcessInfo.cs
+//
+// Author:
+//       Carsten Sonne Larsen <cs@innolan.dk>
+//
+// Copyright (c) 2016 Carsten Sonne Larsen
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+using System;
+using System.Runtime.InteropServices;
+
+namespace Ntp.System
+{
+    public class ProcessInfo
+    {
+        public static int ProcessId {
+            get { return getpid (); }
+        }
+
+        #if __MonoCS__
+        [DllImport ("libc")]
+        private static extern int getpid ();
+        #else
+        private static int getpid () { return 0; }
+        #endif
+    }
+}