[NaCl SDK] nacl_io: Add support for basic socketpairs.

native_client_sdk/src/tests/nacl_io_test/kernel_proxy_test.cc

Index: native_client_sdk/src/tests/nacl_io_test/kernel_proxy_test.cc
diff --git a/native_client_sdk/src/tests/nacl_io_test/kernel_proxy_test.cc b/native_client_sdk/src/tests/nacl_io_test/kernel_proxy_test.cc
index 24a0fd10c2de818d047e11785d567427e7f38af4..8d6e4c0ab1c4e361073d25c870024d3e12ff3ac9 100644
--- a/native_client_sdk/src/tests/nacl_io_test/kernel_proxy_test.cc
+++ b/native_client_sdk/src/tests/nacl_io_test/kernel_proxy_test.cc
@@ -1093,6 +1093,7 @@ TEST_F(KernelProxyErrorTest, WriteError) {
       .WillOnce(DoAll(SetArgPointee<3>(0),  // Wrote 0 bytes.
                       Return(1234)));       // Returned error 1234.
 
+  EXPECT_CALL(*mock_node, GetType()).WillRepeatedly(Return(S_IFDIR));
   EXPECT_CALL(*mock_node, IsaDir()).Times(1);
   EXPECT_CALL(*mock_node, Destroy()).Times(1);
 
@@ -1116,6 +1117,7 @@ TEST_F(KernelProxyErrorTest, ReadError) {
       .WillOnce(DoAll(SetArgPointee<3>(0),  // Read 0 bytes.
                       Return(1234)));       // Returned error 1234.
 
+  EXPECT_CALL(*mock_node, GetType()).WillRepeatedly(Return(S_IFDIR));
   EXPECT_CALL(*mock_node, Destroy()).Times(1);
 
   int fd = ki_open("/dummy", O_RDONLY, 0);