Only report poll failures when it is something we cannot recover from.

runtime/bin/eventhandler_macos.cc

 // Copyright (c) 2011, 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 <errno.h>
 #include <poll.h>
 #include <pthread.h>
 #include <stdio.h>
 #include <string.h>
 #include <sys/time.h>
@@ skipping 328 matching lines @@
 void* EventHandlerImplementation::Poll(void* args) {
   intptr_t pollfds_size;
   struct pollfd* pollfds;
   EventHandlerImplementation* handler =
       reinterpret_cast<EventHandlerImplementation*>(args);
   while (1) {
     pollfds = handler->GetPollFds(&pollfds_size);
     intptr_t millis = handler->GetTimeout();
     intptr_t result = poll(pollfds, pollfds_size, millis);
     if (result == -1) {
-      perror("Poll failed");
+      if (errno != EAGAIN && errno != EINTR) {
+        perror("Poll failed");
+      }
     } else {
       handler->HandleTimeout();
       handler->HandleEvents(pollfds, pollfds_size, result);
     }
     free(pollfds);
   }
   return NULL;
 }
 
 
 void EventHandlerImplementation::StartEventHandler() {
   pthread_t handler_thread;
   int result = pthread_create(&handler_thread,
                               NULL,
                               &EventHandlerImplementation::Poll,
                               this);
   if (result != 0) {
     FATAL("Create start event handler thread");
   }
 }
 
 
 void EventHandlerImplementation::SendData(intptr_t id,
                                           Dart_Port dart_port,
                                           intptr_t data) {
   WakeupHandler(id, dart_port, data);
 }