Fixes #95 - Service not sending SIGINT properly to java

Detach from console process after sending SIGINT to java.
Note: we still need <stopparentprocessfirst> to be set to true, so the
parent (java) process is shut down first.
Moved exception handling to GetChildPids.
StopProcessAndChildren now gets a fresh list of childPids after stopping
a parent process, as that may have caused some child processes to
terminate.

src/Core/WinSWCore/Util/ProcessHelper.cs

@@ -22,14 +22,22 @@ namespace winsw.Util
         /// <returns>List of child process PIDs</returns>
         public static List<int> GetChildPids(int pid)
         {
-            var searcher = new ManagementObjectSearcher("Select * From Win32_Process Where ParentProcessID=" + pid);
 			var childPids = new List<int>();
+			
+			try {
+				var searcher = new ManagementObjectSearcher("Select * From Win32_Process Where ParentProcessID=" + pid);
 				foreach (var mo in searcher.Get())
 				{
 					var childProcessId = mo["ProcessID"];
 					Logger.Info("Found child process: " + childProcessId + " Name: " + mo["Name"]);
 					childPids.Add(Convert.ToInt32(childProcessId));
 				}
+			}
+			catch (Exception ex)
+            {
+                Logger.Warn("Failed to locate children of the process with PID=" + pid + ". Child processes won't be terminated", ex);
+            }
+            
 			return childPids;
         }
 
@@ -90,19 +98,9 @@ namespace winsw.Util
         /// <param name="stopParentProcessFirst">If enabled, the perent process will be terminated before its children on all levels</param>
         public static void StopProcessAndChildren(int pid, TimeSpan stopTimeout, bool stopParentProcessFirst)
         {
-            List<int> childPids = null;
-            try
+			if (!stopParentProcessFirst)
             {         
-                childPids = GetChildPids(pid);
-            }
-            catch (Exception ex)
-            {
-                Logger.Warn("Failed to locate children of the process with PID=" + pid + ". Child processes won't be terminated", ex);
-            }
-
-            if (!stopParentProcessFirst && childPids != null)
-            {  
-                foreach (var childPid in childPids)
+                foreach (var childPid in GetChildPids(pid))
                 {
                     StopProcessAndChildren(childPid, stopTimeout, stopParentProcessFirst);
                 }
@@ -110,9 +108,9 @@ namespace winsw.Util
 
             StopProcess(pid, stopTimeout);
 
-            if (stopParentProcessFirst && childPids != null)
+            if (stopParentProcessFirst)
             {
-                foreach (var childPid in childPids)
+                foreach (var childPid in GetChildPids(pid))
                 {
                     StopProcessAndChildren(childPid, stopTimeout, stopParentProcessFirst);
                 }

src/Core/WinSWCore/Util/SigIntHelper.cs

@@ -49,6 +49,9 @@ namespace winsw.Util
 
                 process.WaitForExit((int)shutdownTimeout.TotalMilliseconds);
 
+                // Detach from console. Causes child console process to be automatically closed.
+                FreeConsole();
+				
                 return process.HasExited;    
             }