Handle /dev/null on linux, as an closed device.

runtime/bin/eventhandler_macos.cc

Index: runtime/bin/eventhandler_macos.cc
diff --git a/runtime/bin/eventhandler_macos.cc b/runtime/bin/eventhandler_macos.cc
index fbced64683ed5af4894d8f780354962c58a50bcb..91c3bf70a1b2100aba3d591640a0310400f4fcc6 100644
--- a/runtime/bin/eventhandler_macos.cc
+++ b/runtime/bin/eventhandler_macos.cc
@@ -102,7 +102,15 @@ static void UpdateKqueue(intptr_t kqueue_fd_, SocketData* sd) {
     int status =
       TEMP_FAILURE_RETRY(kevent(kqueue_fd_, events, changes, NULL, 0, NULL));
     if (status == -1) {
-      FATAL1("Failed updating kqueue: %s\n", strerror(errno));
+      // kQueue does not accept the file descriptor. It could be due to
+      // already closed file descriptor, or unuspported devices, such
+      // as /dev/null. In such case, mark the file descriptor as closed,
+      // so dart will handle it accordingly.
+      sd->set_write_tracked_by_kqueue(false);
+      sd->set_read_tracked_by_kqueue(false);
+      sd->ShutdownRead();
+      sd->ShutdownWrite();
+      DartUtils::PostInt32(sd->port(), 1 << kCloseEvent);
     }
   }
 }