Handle legacy epoll event on Linux.

runtime/bin/eventhandler_linux.cc

Index: runtime/bin/eventhandler_linux.cc
diff --git a/runtime/bin/eventhandler_linux.cc b/runtime/bin/eventhandler_linux.cc
index 1bf9378aac2a309bc04abd33fbefbdd58fcb3e4a..7b5bd707acd67685363c626192fab313885a7416 100644
--- a/runtime/bin/eventhandler_linux.cc
+++ b/runtime/bin/eventhandler_linux.cc
@@ -314,6 +314,9 @@ intptr_t EventHandlerImplementation::GetPollEvents(intptr_t events,
         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) {
@@ -324,6 +327,12 @@ intptr_t EventHandlerImplementation::GetPollEvents(intptr_t events,
         event_mask |= (1 << kOutEvent);
       }
     }
+
+    if (events == (EPOLLHUP | EPOLLERR)) {
+      event_mask = (1 << kErrorEvent);
+      sd->MarkClosedWrite();
+      sd->MarkClosedRead();
+    }
   }
 
   return event_mask;