[NaCl SDK] nacl_io: Add flow control the JavaScript pipes.

native_client_sdk/src/tests/nacl_io_test/event_test.cc

 /* Copyright (c) 2013 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include <errno.h>
 #include <fcntl.h>
 #include <pthread.h>
 #include <stdio.h>
 #include <sys/ioctl.h>
@@ skipping 156 matching lines @@
   // Expect to time out on input.
   {
     EventListenerLock locker(&pipe);
     EXPECT_EQ(ETIMEDOUT, locker.WaitOnEvent(POLLIN, 0));
   }
 
   // Output should be ready to go.
   {
     EventListenerLock locker(&pipe);
     EXPECT_EQ(0, locker.WaitOnEvent(POLLOUT, 0));
-    EXPECT_EQ(sizeof(hello), pipe.Write_Locked(hello, sizeof(hello)));
+    int out_bytes = 0;
+    EXPECT_EQ(0, pipe.Write_Locked(hello, sizeof(hello), &out_bytes));
+    EXPECT_EQ(sizeof(hello), out_bytes);
   }
 
   // We should now be able to poll
   {
     EventListenerLock locker(&pipe);
     EXPECT_EQ(0, locker.WaitOnEvent(POLLIN, 0));
-    EXPECT_EQ(sizeof(hello), pipe.Read_Locked(tmp, sizeof(tmp)));
+    int out_bytes = -1;
+    EXPECT_EQ(0, pipe.Read_Locked(tmp, sizeof(tmp), &out_bytes));
+    EXPECT_EQ(sizeof(hello), out_bytes);
   }
 
   // Verify we can read it correctly.
   EXPECT_EQ(0, strcmp(hello, tmp));
 }
 
 class StreamFsForTesting : public StreamFs {
  public:
   StreamFsForTesting() {}
 };
@@ skipping 145 matching lines @@
 
   ASSERT_EQ(4, kp->select(fds[1] + 1, &rd_set, &wr_set, &ex_set, &tv));
 
   // Verify guard values were not touched.
   for (int i = 1; i < sizeof(fd_set); i++) {
     ASSERT_EQ(guard_value, ((char*)&rd_set)[i]);
     ASSERT_EQ(guard_value, ((char*)&wr_set)[i]);
     ASSERT_EQ(guard_value, ((char*)&ex_set)[i]);
   }
 }