Creating a pexe content handler to translate and run pexes.

services/nacl/pnacl_link.cc

+// Copyright 2015 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 <fcntl.h>
+
+#include "base/files/file_util.h"
+#include "mojo/nacl/nonsfi/irt_mojo_nonsfi.h"
+#include "mojo/nacl/nonsfi/nexe_launcher_nonsfi.h"
+#include "mojo/public/c/system/main.h"
+#include "mojo/public/cpp/application/application_connection.h"
+#include "mojo/public/cpp/application/application_delegate.h"
+#include "mojo/public/cpp/application/application_impl.h"
+#include "mojo/public/cpp/application/application_runner.h"
+#include "mojo/public/cpp/application/interface_factory.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
+#include "services/nacl/pnacl_link.mojom.h"
+#include "url/gurl.h"
+
+namespace mojo {
+namespace nacl {
+
+class PexeLinkerImpl : public PexeLinkerInit {
+ public:
+  void PexeLinkerStart(ScopedMessagePipeHandle handle) override {
+    std::string path = GetBasePath();
+    ::nacl::MojoSetBasePath(path);
+    path.append("pnacl_translation_files/ld.nexe");
+    int nexe_fd = open(path.c_str(), O_RDONLY);
+    if (nexe_fd < 0)
+      LOG(FATAL) << "Could not open linker nexe: " << path;
+    ::nacl::MojoLaunchNexeNonsfi(nexe_fd,
+                                 handle.release().value(),
+                                 true /* enable_translate_irt */);
+  }
+ private:
+  virtual std::string GetBasePath() { return ""; }

[Mark Seaborn, 2015/10/28 18:31:43]

This could presumably be "virtual ... = 0"?

But I don't see why you need this method.  If this is global anyway, why not do
MojoSetBasePath() in Initialize() and MojoGetBasePath() in PexeLinkerStart()?

Or at least make "std::string base_path_" a member of PexeLinkerImpl and pass
base_path through all the constructors.

[Sean Klein, 2015/10/28 21:39:59]

Replaced with PathService, so this has been removed.

+};
+
+class StrongBindingPexeLinkerImpl : public PexeLinkerImpl {
+ public:
+  explicit StrongBindingPexeLinkerImpl(InterfaceRequest<PexeLinkerInit> request,
+                                       std::string& base_path)
+      : base_path_(base_path), strong_binding_(this, request.Pass()) {}
+
+ private:
+  std::string GetBasePath() override { return base_path_; }
+  std::string base_path_;
+  StrongBinding<PexeLinkerInit> strong_binding_;
+};
+
+class MultiPexeLinker : public ApplicationDelegate,
+                        public InterfaceFactory<PexeLinkerInit> {
+ public:
+  MultiPexeLinker() {}
+
+  // From ApplicationDelegate
+  void Initialize(ApplicationImpl* app) override {
+    std::string app_path = GURL(app->url()).GetContent();
+    base_path = app_path.substr(0, app_path.find_last_of("/") + 1);
+  }
+
+  // From ApplicationDelegate
+  bool ConfigureIncomingConnection(ApplicationConnection* connection) override {
+    connection->AddService<PexeLinkerInit>(this);
+    return true;
+  }
+
+  // From InterfaceFactory
+  void Create(ApplicationConnection* connection,
+              InterfaceRequest<PexeLinkerInit> request) override {
+    new StrongBindingPexeLinkerImpl(request.Pass(), base_path);
+  }
+
+  std::string base_path;

[Mark Seaborn, 2015/10/28 18:31:43]

This could be private.

[Sean Klein, 2015/10/28 21:39:59]

Removed.

+};
+
+}  // namespace nacl
+}  // namespace mojo
+
+MojoResult MojoMain(MojoHandle application_request) {
+  mojo::ApplicationRunner runner(new mojo::nacl::MultiPexeLinker());
+  return runner.Run(application_request);
+}