[NaCl SDK] nacl_io: Added support for access() syscall.

native_client_sdk/src/libraries/nacl_io/mount_html5fs.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 "nacl_io/mount_html5fs.h"
 
 #include <errno.h>
+#include <fcntl.h>
 #include <ppapi/c/pp_completion_callback.h>
 #include <ppapi/c/pp_errors.h>
 #include <stdlib.h>
 #include <string.h>
 #include <algorithm>
 #include "nacl_io/mount_node_html5fs.h"
 #include "sdk_util/auto_lock.h"
 
 namespace {
 
 #if defined(WIN32)
 int64_t strtoull(const char* nptr, char** endptr, int base) {
   return _strtoui64(nptr, endptr, base);
 }
 #endif
 
 }  // namespace
 
+Error MountHtml5Fs::Access(const Path& path, int a_mode) {
+  // a_mode is unused, since all files are readable, writable and executable.
+  MountNode* node;
+  Error error = Open(path, O_RDONLY, &node);
+  if (error)
+    return error;
+
+  node->Release();
+  return 0;
+}
+
 Error MountHtml5Fs::Open(const Path& path, int mode, MountNode** out_node) {
   *out_node = NULL;
 
   Error error = BlockUntilFilesystemOpen();
   if (error)
     return error;
 
   PP_Resource fileref = ppapi()->GetFileRefInterface()
       ->Create(filesystem_resource_, path.Join().c_str());
   if (!fileref)
@@ skipping 134 matching lines @@
   MountHtml5Fs* self = static_cast<MountHtml5Fs*>(user_data);
   self->FilesystemOpenCallback(result);
 }
 
 void MountHtml5Fs::FilesystemOpenCallback(int32_t result) {
   AutoLock lock(&lock_);
   filesystem_open_has_result_ = true;
   filesystem_open_error_ = PPErrorToErrno(result);
   pthread_cond_signal(&filesystem_open_cond_);
 }