Several bugfixes in dart:io's handing of sockets

dart/runtime/bin/eventhandler_linux.cc

Index: dart/runtime/bin/eventhandler_linux.cc
diff --git a/dart/runtime/bin/eventhandler_linux.cc b/dart/runtime/bin/eventhandler_linux.cc
index 0701810a55bbc135d5533b4239d11c2114dc8e93..805c641e74881c0e7dc1e6585a085ca241e22db6 100644
--- a/dart/runtime/bin/eventhandler_linux.cc
+++ b/dart/runtime/bin/eventhandler_linux.cc
@@ -200,17 +200,17 @@ void EventHandlerImplementation::HandleInterruptFd() {
       SocketData* sd = GetSocketData(
           msg[i].id, (msg[i].data & (1 << kListeningSocket)) != 0);
       if ((msg[i].data & (1 << kShutdownReadCommand)) != 0) {
-        ASSERT(msg[i].data == (1 << kShutdownReadCommand));
+        ASSERT(COMMAND_MASK(msg[i].data) == (1 << kShutdownReadCommand));
         ASSERT(!sd->IsListeningSocket());
         // Close the socket for reading.
         VOID_NO_RETRY_EXPECTED(shutdown(sd->fd(), SHUT_RD));
       } else if ((msg[i].data & (1 << kShutdownWriteCommand)) != 0) {
-        ASSERT(msg[i].data == (1 << kShutdownWriteCommand));
+        ASSERT(COMMAND_MASK(msg[i].data) == (1 << kShutdownWriteCommand));
         ASSERT(!sd->IsListeningSocket());
         // Close the socket for writing.
         VOID_NO_RETRY_EXPECTED(shutdown(sd->fd(), SHUT_WR));
       } else if ((msg[i].data & (1 << kCloseCommand)) != 0) {
-        ASSERT(msg[i].data == (1 << kCloseCommand));
+        ASSERT(COMMAND_MASK(msg[i].data) == (1 << kCloseCommand));
         // Close the socket and free system resources and move on to
         // next message.
         if (sd->RemovePort(msg[i].dart_port)) {