Treat EAGAIN/EWOULDBLOCK as requests for retry on socket accept.

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/thread.h"
 #include "platform/utils.h"
@@ skipping 193 matching lines @@
   Dart_EnterScope();
   intptr_t socket =
       DartUtils::GetIntegerField(Dart_GetNativeArgument(args, 0),
                                  DartUtils::kIdFieldName);
   Dart_Handle socketobj = Dart_GetNativeArgument(args, 1);
   intptr_t newSocket = ServerSocket::Accept(socket);
   if (newSocket >= 0) {
     DartUtils::SetIntegerField(
         socketobj, DartUtils::kIdFieldName, newSocket);
     Dart_SetReturnValue(args, Dart_True());
+  } else if (newSocket == ServerSocket::kTemporaryFailure) {
+    Dart_SetReturnValue(args, Dart_False());
   } else {
     Dart_SetReturnValue(args, DartUtils::NewDartOSError());
   }
   Dart_ExitScope();
 }
 
 
 static CObject* LookupRequest(const CObjectArray& request) {
   if (request.Length() == 2 && request[1]->IsString()) {
     CObjectString host(request[1]);
@@ skipping 65 matching lines @@
   Dart_EnterScope();
   Dart_SetReturnValue(args, Dart_Null());
   Dart_Port service_port = Socket::GetServicePort();
   if (service_port != kIllegalPort) {
     // Return a send port for the service port.
     Dart_Handle send_port = Dart_NewSendPort(service_port);
     Dart_SetReturnValue(args, send_port);
   }
   Dart_ExitScope();
 }