Fix net::FileStream to handle POSIX errors correctly.

net/base/file_stream_unittest.cc

 // Copyright (c) 2012 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 "net/base/file_stream.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/file_util.h"
 #include "base/message_loop.h"
@@ skipping 1013 matching lines @@
   EXPECT_EQ(ERR_IO_PENDING, rv);
 
   // Delete the stream without waiting for the open operation to be
   // complete. Should be safe.
   stream.reset();
   // open_callback won't be called.
   MessageLoop::current()->RunUntilIdle();
   EXPECT_FALSE(open_callback.have_result());
 }
 
+// Verify that async Write() errors are mapped correctly.
+TEST_F(FileStreamTest, AsyncWriteError) {
+  scoped_ptr<FileStream> stream(new FileStream(NULL));
+  int flags = base::PLATFORM_FILE_CREATE_ALWAYS |
+              base::PLATFORM_FILE_WRITE |
+              base::PLATFORM_FILE_ASYNC;
+  int rv = stream->OpenSync(temp_file_path(), flags);
+  EXPECT_EQ(OK, rv);
+
+  TestCompletionCallback callback;
+
+  // Try passing NULL buffer to Write() and check that it fails.
+  scoped_refptr<IOBuffer> buf = new WrappedIOBuffer(NULL);
+  rv = stream->Write(buf, 1, callback.callback());
+  if (rv == ERR_IO_PENDING)
+    rv = callback.WaitForResult();
+  EXPECT_LT(rv, 0);
+}
+
+// Verify that async Read() errors are mapped correctly.
+TEST_F(FileStreamTest, AsyncReadError) {
+  scoped_ptr<FileStream> stream(new FileStream(NULL));
+  int flags = base::PLATFORM_FILE_OPEN |
+              base::PLATFORM_FILE_READ |
+              base::PLATFORM_FILE_ASYNC;
+  int rv = stream->OpenSync(temp_file_path(), flags);
+  EXPECT_EQ(OK, rv);
+
+  TestCompletionCallback callback;
+
+  // Try passing NULL buffer to Read() and check that it fails.
+  scoped_refptr<IOBuffer> buf = new WrappedIOBuffer(NULL);
+  rv = stream->Read(buf, 1, callback.callback());
+  if (rv == ERR_IO_PENDING)
+    rv = callback.WaitForResult();
+  EXPECT_LT(rv, 0);
+}
+
 }  // namespace
 
 }  // namespace net