SIGQUIT toggles VM service HTTP server

runtime/bin/vmservice_impl.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "bin/vmservice_impl.h"
 
 #include "include/dart_api.h"
 
 #include "bin/builtin.h"
 #include "bin/dartutils.h"
@@ skipping 112 matching lines @@
     Dart_ShutdownIsolate();
     error_msg_ = "Invalid isolate state - Unable to make it runnable.";
     return false;
   }
 
   Dart_EnterIsolate(isolate);
   Dart_EnterScope();
   library = Dart_RootLibrary();
   // Set requested TCP port.
   DartUtils::SetStringField(library, "_ip", server_ip);
+  // If we have a port specified, start the server immediately.
+  bool auto_start = server_port >= 0;
+  if (server_port < 0) {
+    // Adjust server_port to port 0 which will result in the first available
+    // port when the HTTP server is started.
+    server_port = 0;
+  }
+  // Set initial state.
   DartUtils::SetIntegerField(library, "_port", server_port);
+  Dart_SetField(library,
+                DartUtils::NewString("_autoStart"),
+                Dart_NewBoolean(auto_start));
+  // Invoke main.
   result = Dart_Invoke(library, DartUtils::NewString("main"), 0, NULL);
   SHUTDOWN_ON_ERROR(result);
   // Load resources.
   result = LoadResources(library);
   SHUTDOWN_ON_ERROR(result);
 
   Dart_ExitScope();
   Dart_ExitIsolate();
 
   return true;
@@ skipping 133 matching lines @@
     printf("Service exited with an error:\n%s\n", Dart_GetError(result));
   }
   Dart_ExitScope();
   Dart_ExitIsolate();
 }
 
 
 
 }  // namespace bin
 }  // namespace dart