Make std* blocking file-descriptors.

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 0db1f533efc6dfcfc5a970f08b01431f0c573438..f57594966e8e4e4a5a93436656e4ba5d409fbc9e 100644
--- a/runtime/bin/eventhandler_linux.cc
+++ b/runtime/bin/eventhandler_linux.cc
@@ -235,15 +235,7 @@ void EventHandlerImplementation::HandleInterruptFd() {
         // next message.
         RemoveFromEpollInstance(epoll_fd_, sd);
         intptr_t fd = sd->fd();
-        if (fd == STDOUT_FILENO) {
-          // If stdout, redirect fd to /dev/null.
-          int null_fd = TEMP_FAILURE_RETRY(open("/dev/null", O_WRONLY));
-          ASSERT(null_fd >= 0);
-          VOID_TEMP_FAILURE_RETRY(dup2(null_fd, STDOUT_FILENO));
-          VOID_TEMP_FAILURE_RETRY(close(null_fd));
-        } else {
-          sd->Close();
-        }
+        sd->Close();
         socket_map_.Remove(GetHashmapKeyFromFd(fd), GetHashmapHashFromFd(fd));
         delete sd;
         DartUtils::PostInt32(msg[i].dart_port, 1 << kDestroyedEvent);