Implement open_resource in non-SFI mode.

ppapi/nacl_irt/irt_manifest.cc

+// Copyright 2014 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 "ppapi/nacl_irt/irt_manifest.h"
+
+#include "native_client/src/trusted/service_runtime/include/sys/errno.h"
+#include "ppapi/nacl_irt/manifest_service.h"
+#include "ppapi/nacl_irt/plugin_startup.h"
+
+namespace ppapi {
+
+int IrtOpenResource(const char* file, int* fd) {

[Mark Seaborn, 2014/04/30 21:20:58]

Can you move this into ppapi/nacl_irt/manifest_service.cc, please?  I don't see
a need to have the untrusted-code implementation split across two files -- it
makes the code harder to follow.

[hidehiko, 2014/05/01 05:20:31]

Done. Note that please let me keep the header file separate from the
manifest_service.h. I do not want to include unnecessary code in the header,
especially in the exposed header file.

+  // Remove leading '/' character.
+  if (file[0] == '/')
+    ++file;
+
+  ManifestService* manifest_service = GetManifestService();
+  if (manifest_service == NULL ||
+      !manifest_service->OpenResource(file, fd)) {
+    return NACL_ABI_EIO;
+  }
+
+  return (*fd == -1) ? NACL_ABI_ENOENT : 0;
+}
+
+}  // namespace ppapi