Handle legacy epoll event on Linux.

runtime/bin/eventhandler_linux.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 "platform/globals.h"
 #if defined(TARGET_OS_LINUX)
 
 #include "bin/eventhandler.h"
 
 #include <errno.h>  // NOLINT
@@ skipping 296 matching lines @@
     }
 
     // On pipes EPOLLHUP is reported without EPOLLIN when there is no
     // more data to read.
     if (sd->IsPipe()) {
       if (((events & EPOLLIN) == 0) &&
           ((events & EPOLLHUP) != 0)) {
         event_mask = (1 << kCloseEvent);
         sd->MarkClosedRead();
       }
+    } else {
+      // Assert we never get an EPOLLHUP on a non-pipe file-descriptor.
+      ASSERT(events != EPOLLHUP);
     }
 
     if ((events & EPOLLOUT) != 0) {
       if ((events & EPOLLERR) != 0) {
         event_mask = (1 << kErrorEvent);
         sd->MarkClosedWrite();
       } else {
         event_mask |= (1 << kOutEvent);
       }
     }
+
+    if (events == (EPOLLHUP | EPOLLERR)) {
+      event_mask = (1 << kErrorEvent);
+      sd->MarkClosedWrite();
+      sd->MarkClosedRead();
+    }
   }
 
   return event_mask;
 }
 
 
 void EventHandlerImplementation::HandleEvents(struct epoll_event* events,
                                               int size) {
   for (int i = 0; i < size; i++) {
     if (events[i].data.ptr != NULL) {
@@ skipping 88 matching lines @@
   return reinterpret_cast<void*>(fd + 1);
 }
 
 
 uint32_t EventHandlerImplementation::GetHashmapHashFromFd(intptr_t fd) {
   // The hashmap does not support keys with value 0.
   return dart::Utils::WordHash(fd + 1);
 }
 
 #endif  // defined(TARGET_OS_LINUX)