Throw an error if the ServerSocket host argument is invalid.

runtime/bin/socket.cc

 // Copyright (c) 2012, 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/socket.h"
 #include "bin/dartutils.h"
 #include "bin/thread.h"
 #include "bin/utils.h"
 
 #include "platform/globals.h"
@@ skipping 220 matching lines @@
       DartUtils::GetInt64Value(port_obj, &port) &&
       DartUtils::GetInt64Value(backlog_obj, &backlog)) {
     const char* bind_address = DartUtils::GetStringValue(bind_address_obj);
     intptr_t socket =
         ServerSocket::CreateBindListen(bind_address, port, backlog);
     if (socket >= 0) {
       DartUtils::SetIntegerField(
           socket_obj, DartUtils::kIdFieldName, socket);
       Dart_SetReturnValue(args, Dart_True());
     } else {
-      Dart_SetReturnValue(args, DartUtils::NewDartOSError());
+      if (socket == -5) {
+        OSError os_error(-1, "Invalid host", OSError::kUnknown);
+        Dart_SetReturnValue(args, DartUtils::NewDartOSError(&os_error));
+      } else {
+        Dart_SetReturnValue(args, DartUtils::NewDartOSError());
+      }
     }
   } else {
     OSError os_error(-1, "Invalid argument", OSError::kUnknown);
     Dart_Handle err = DartUtils::NewDartOSError(&os_error);
     if (Dart_IsError(err)) Dart_PropagateError(err);
     Dart_SetReturnValue(args, err);
   }
   Dart_ExitScope();
 }
 
@@ skipping 89 matching lines @@
   Dart_EnterScope();
   Dart_SetReturnValue(args, Dart_Null());
   Dart_Port service_port = Socket::GetServicePort();
   if (service_port != ILLEGAL_PORT) {
     // Return a send port for the service port.
     Dart_Handle send_port = Dart_NewSendPort(service_port);
     Dart_SetReturnValue(args, send_port);
   }
   Dart_ExitScope();
 }