Implement IUserServiceCreator: 1 (CreateClientProcessMonitor) (ryubing/ryujinx!181)

See merge request ryubing/ryujinx!181

src/Ryujinx.HLE/HOS/Services/Ldn/IUserServiceCreator.cs

@@ -15,5 +15,14 @@ namespace Ryujinx.HLE.HOS.Services.Ldn
 
             return ResultCode.Success;
         }
+
+        [CommandCmif(1)] // 18.0.0+
+        // CreateClientProcessMonitor() -> object<nn::ldn::detail::IClientProcessMonitor>
+        public ResultCode CreateClientProcessMonitor(ServiceCtx context)
+        {
+            MakeObject(context, new IClientProcessMonitor(context));
+
+            return ResultCode.Success;
+        }
     }
 }

src/Ryujinx.HLE/HOS/Services/Ldn/UserServiceCreator/IClientProcessMonitor.cs

@@ -0,0 +1,20 @@
+using Ryujinx.Common.Logging;
+
+namespace Ryujinx.HLE.HOS.Services.Ldn.UserServiceCreator
+{
+    class IClientProcessMonitor : DisposableIpcService
+    {
+        public IClientProcessMonitor(ServiceCtx context) { }
+
+        [CommandCmif(0)] // 18.0.0+
+        // RegisterClient(u64 pid_placeholder, pid)
+        public ResultCode RegisterClient(ServiceCtx context)
+        {
+            Logger.Stub?.PrintStub(LogClass.ServiceLdn);
+
+            return ResultCode.Success;
+        }
+
+        protected override void Dispose(bool isDisposing) { }
+    }
+}