Unifying ChildProcessLauncher across platforms.

content/browser/child_process_launcher_helper_win.cc

+// Copyright 2017 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 "base/files/file_path.h"
+#include "base/metrics/field_trial.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/win/scoped_handle.h"
+#include "base/win/win_util.h"
+#include "content/browser/child_process_launcher_helper.h"
+#include "content/common/sandbox_win.h"
+#include "content/public/common/result_codes.h"
+#include "content/public/common/sandbox_init.h"
+#include "content/public/common/sandboxed_process_launcher_delegate.h"
+#include "mojo/edk/embedder/named_platform_channel_pair.h"
+#include "mojo/edk/embedder/platform_channel_pair.h"
+#include "mojo/edk/embedder/scoped_platform_handle.h"
+#include "sandbox/win/src/sandbox_types.h"
+
+namespace content {
+namespace internal {
+
+void ChildProcessLauncherHelper::BeforeLaunchOnClientThread() {
+  DCHECK_CURRENTLY_ON(client_thread_id_);
+}
+
+mojo::edk::ScopedPlatformHandle
+ChildProcessLauncherHelper::PrepareMojoPipeHandlesOnClientThread() {
+  DCHECK_CURRENTLY_ON(client_thread_id_);
+
+  if (!delegate_->ShouldLaunchElevated())
+    return mojo::edk::ScopedPlatformHandle();
+
+  mojo::edk::NamedPlatformChannelPair named_pair;
+  named_pair.PrepareToPassClientHandleToChildProcess(command_line());
+  return named_pair.PassServerHandle();
+}
+
+std::unique_ptr<FileMappedForLaunch>
+ChildProcessLauncherHelper::GetFilesToMap() {
+  return std::unique_ptr<FileMappedForLaunch>();
+}
+
+void ChildProcessLauncherHelper::BeforeLaunchOnLauncherThread(
+    const FileMappedForLaunch& files_to_register,
+    base::LaunchOptions* options) {
+  DCHECK_CURRENTLY_ON(BrowserThread::PROCESS_LAUNCHER);
+}
+
+ChildProcessLauncherHelper::Process
+ChildProcessLauncherHelper::LaunchProcessOnLauncherThread(
+    const base::LaunchOptions& options,
+    std::unique_ptr<FileMappedForLaunch> files_to_register,
+    bool* is_synchronous_launch,
+    int* launch_result) {
+  DCHECK_CURRENTLY_ON(BrowserThread::PROCESS_LAUNCHER);
+  *is_synchronous_launch = true;
+  if (delegate_->ShouldLaunchElevated()) {
+    // When establishing a Mojo connection, the pipe path has already been added
+    // to the command line.
+    base::LaunchOptions win_options;
+    win_options.start_hidden = true;
+    ChildProcessLauncherHelper::Process process;
+    process.process = base::LaunchElevatedProcess(*command_line(), win_options);
+    return process;
+  }
+  base::HandlesToInheritVector handles;
+  handles.push_back(mojo_client_handle().handle);
+  base::FieldTrialList::AppendFieldTrialHandleIfNeeded(&handles);
+  command_line()->AppendSwitchASCII(
+      mojo::edk::PlatformChannelPair::kMojoPlatformChannelHandleSwitch,
+      base::UintToString(base::win::HandleToUint32(handles[0])));
+  ChildProcessLauncherHelper::Process process;
+  *launch_result = StartSandboxedProcess(
+      delegate_.get(),
+      command_line(),
+      handles,
+      &process.process);
+  return process;
+}
+
+void ChildProcessLauncherHelper::AfterLaunchOnLauncherThread(
+    const ChildProcessLauncherHelper::Process& process,
+    const base::LaunchOptions& options) {
+  DCHECK_CURRENTLY_ON(BrowserThread::PROCESS_LAUNCHER);
+}
+
+// static
+base::TerminationStatus ChildProcessLauncherHelper::GetTerminationStatus(
+    const ChildProcessLauncherHelper::Process& process,
+    bool known_dead,
+    int* exit_code) {
+  return base::GetTerminationStatus(process.process.Handle(), exit_code);
+}
+
+// static
+bool ChildProcessLauncherHelper::TerminateProcess(
+    const base::Process& process, int exit_code, bool wait) {
+  return process.Terminate(exit_code, wait);
+}
+
+void ChildProcessLauncherHelper::ForceNormalProcessTerminationSync(
+    ChildProcessLauncherHelper::Process process) {
+  DCHECK_CURRENTLY_ON(BrowserThread::PROCESS_LAUNCHER);
+  // Client has gone away, so just kill the process.  Using exit code 0 means
+  // that UMA won't treat this as a crash.
+  process.process.Terminate(RESULT_CODE_NORMAL_EXIT, false);
+}
+
+// static
+void ChildProcessLauncherHelper::SetProcessBackgroundedOnLauncherThread(
+      base::Process process, bool background) {
+  DCHECK_CURRENTLY_ON(BrowserThread::PROCESS_LAUNCHER);
+  if (process.CanBackgroundProcesses())
+    process.SetProcessBackgrounded(background);
+}
+
+}  // namespace internal
+}  // namespace content