Don't make timerfd non-blocking and add errno to error-mesage.

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 335238c4952c71e94b800bd4e92e9eb450517ee2..0db1f533efc6dfcfc5a970f08b01431f0c573438 100644
--- a/runtime/bin/eventhandler_linux.cc
+++ b/runtime/bin/eventhandler_linux.cc
@@ -134,8 +134,7 @@ EventHandlerImplementation::EventHandlerImplementation()
   if (status == -1) {
     FATAL("Failed adding interrupt fd to epoll instance");
   }
-  timer_fd_ = TEMP_FAILURE_RETRY(timerfd_create(CLOCK_REALTIME,
-                                                TFD_NONBLOCK | TFD_CLOEXEC));
+  timer_fd_ = TEMP_FAILURE_RETRY(timerfd_create(CLOCK_REALTIME, TFD_CLOEXEC));
   if (epoll_fd_ == -1) {
     FATAL("Failed creating timerfd file descriptor");
   }
@@ -147,7 +146,8 @@ EventHandlerImplementation::EventHandlerImplementation()
                                         timer_fd_,
                                         &event));
   if (status == -1) {
-    FATAL("Failed adding timerfd fd to epoll instance");
+    FATAL2(
+        "Failed adding timerfd fd(%i) to epoll instance: %i", timer_fd_, errno);
   }
 }