Changed how running a process and waiting for exit is handled

src/NzbDrone.Common/Processes/ProcessProvider.cs

@@ -179,9 +179,7 @@ namespace NzbDrone.Common.Processes
         public ProcessOutput StartAndCapture(string path, string args = null)
         {
             var output = new ProcessOutput();
-            var process = Start(path, args, s => output.Standard.Add(s), error => output.Error.Add(error));
+            Start(path, args, s => output.Standard.Add(s), error => output.Error.Add(error)).WaitForExit();
-
-            WaitForExit(process);
 
             return output;
         }
@@ -190,11 +188,8 @@ namespace NzbDrone.Common.Processes
         {
             Logger.Trace("Waiting for process {0} to exit.", process.ProcessName);
 
-            if (!process.HasExited)
-            {
             process.WaitForExit();
         }
-        }
 
         public void SetPriority(int processId, ProcessPriorityClass priority)
         {

src/NzbDrone.Mono/NzbDroneProcessProvider.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using NLog;
 using NzbDrone.Common.Model;
 using NzbDrone.Common.Processes;
 
@@ -9,10 +10,12 @@ namespace NzbDrone.Mono
     public class NzbDroneProcessProvider : INzbDroneProcessProvider
     {
         private readonly IProcessProvider _processProvider;
+        private readonly Logger _logger;
 
-        public NzbDroneProcessProvider(IProcessProvider processProvider)
+        public NzbDroneProcessProvider(IProcessProvider processProvider, Logger logger)
         {
             _processProvider = processProvider;
+            _logger = logger;
         }
 
         public List<ProcessInfo> FindNzbDroneProcesses()
@@ -20,11 +23,20 @@ namespace NzbDrone.Mono
             var monoProcesses = _processProvider.FindProcessByName("mono");
 
             return monoProcesses.Where(c =>
+            {
+                try
                 {
                     var processArgs = _processProvider.StartAndCapture("ps", String.Format("-p {0} -o args=", c.Id));
 
                     return processArgs.Standard.Any(p => p.Contains(ProcessProvider.NZB_DRONE_PROCESS_NAME + ".exe") ||
                                                          p.Contains(ProcessProvider.NZB_DRONE_CONSOLE_PROCESS_NAME + ".exe"));
+                }
+                catch (InvalidOperationException ex)
+                {
+                    _logger.WarnException("Error getting process arguments", ex);
+                    return false;
+                }
+                
             }).ToList();
         }
     }