Add a PIDFile in [Startup], which the PID will be written to

OpenSim/Framework/Servers/BaseOpenSimServer.cs

@@ -73,6 +73,8 @@ namespace OpenSim.Framework.Servers
         /// </summary>
         protected string m_version;
 
+        protected string m_pidFile = String.Empty;
+
         protected BaseHttpServer m_httpServer;
         public BaseHttpServer HttpServer
         {
@@ -278,6 +280,7 @@ namespace OpenSim.Framework.Servers
             ShutdownSpecific();
             
             m_log.Info("[SHUTDOWN]: Shutdown processing on main thread complete.  Exiting...");
+            RemovePIDFile();
             
             Environment.Exit(0);
         }
@@ -433,5 +436,38 @@ namespace OpenSim.Framework.Servers
 
             m_version += string.IsNullOrEmpty(buildVersion) ? "      " : ("." + buildVersion + "     ").Substring(0, 6);
         }
+        
+        protected void CreatePIDFile(string path)
+        {
+            try
+            {
+                string pidstring = System.Diagnostics.Process.GetCurrentProcess().Id.ToString();
+                FileStream fs = File.Create(path);
+                System.Text.ASCIIEncoding enc = new System.Text.ASCIIEncoding();
+                Byte[] buf = enc.GetBytes(pidstring);
+                fs.Write(buf, 0, buf.Length);
+                fs.Close();
+                m_pidFile = path;
+            }
+            catch (Exception)
+            {
+            }
+        }
+
+            
+        protected void RemovePIDFile()
+        {
+            if (m_pidFile != String.Empty)
+            {
+                try
+                {
+                    File.Delete(m_pidFile);
+                    m_pidFile = String.Empty;
+                }
+                catch (Exception)
+                {
+                }
+            }
+        }
     }
 }

OpenSim/Region/Application/OpenSimBase.cs

@@ -188,6 +188,14 @@ namespace OpenSim
         /// </summary>
         protected override void StartupSpecific()
         {
+            IConfig startupConfig = m_config.Source.Configs["Startup"];
+            if (startupConfig != null)
+            {
+                string pidFile = startupConfig.GetString("PIDFile", String.Empty);
+                if (pidFile != String.Empty)
+                    CreatePIDFile(pidFile);
+            }
+
             base.StartupSpecific();
 
             m_stats = StatsManager.StartCollectingSimExtraStats();

bin/OpenSim.ini.example

@@ -7,6 +7,9 @@
     ; (eg default is /opensimdir/crashes/*.txt or C:\opensim\crashes\*.txt)
     crash_dir = "crashes"
 
+    ; Place to create a PID file
+    ; PIDFile = "/tmp/my.pid"
+
     ; Http proxy support for llHTTPRequest and dynamic texture loading
     ; Set HttpProxy to the URL for your proxy server if you would like
     ; to proxy llHTTPRequests through a firewall