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mojo/shell/child_process_host.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 "mojo/shell/child_process_host.h"
+
+#include "base/base_switches.h"
+#include "base/bind.h"
+#include "base/command_line.h"
+#include "base/location.h"
+#include "base/logging.h"
+#include "base/macros.h"
+#include "base/process/kill.h"
+#include "base/process/launch.h"
+#include "base/task_runner.h"
+#include "base/task_runner_util.h"
+#include "mojo/shell/context.h"
+#include "mojo/shell/switches.h"
+
+namespace mojo {
+namespace shell {
+
+ChildProcessHost::ChildProcessHost(Context* context) : context_(context) {
+  platform_channel_ = platform_channel_pair_.PassServerHandle();
+  CHECK(platform_channel_.is_valid());
+}
+
+ChildProcessHost::~ChildProcessHost() {
+  if (child_process_.IsValid()) {
+    LOG(WARNING) << "Destroying ChildProcessHost with unjoined child";
+    child_process_.Close();
+  }
+}
+
+void ChildProcessHost::Start() {
+  DCHECK(!child_process_.IsValid());
+
+  WillStart();
+
+  CHECK(base::PostTaskAndReplyWithResult(
+      context_->task_runners()->blocking_pool(), FROM_HERE,
+      base::Bind(&ChildProcessHost::DoLaunch, base::Unretained(this)),
+      base::Bind(&ChildProcessHost::DidStart, base::Unretained(this))));
+}
+
+int ChildProcessHost::Join() {
+  DCHECK(child_process_.IsValid());
+  int rv = -1;
+  LOG_IF(ERROR, !child_process_.WaitForExit(&rv))
+      << "Failed to wait for child process";
+  child_process_.Close();
+  return rv;
+}
+
+bool ChildProcessHost::DoLaunch() {
+  static const char* kForwardSwitches[] = {
+      switches::kTraceToConsole, switches::kV, switches::kVModule,
+  };
+
+  const base::CommandLine* parent_command_line =
+      base::CommandLine::ForCurrentProcess();
+  base::CommandLine child_command_line(parent_command_line->GetProgram());
+  child_command_line.CopySwitchesFrom(*parent_command_line, kForwardSwitches,
+                                      arraysize(kForwardSwitches));
+  child_command_line.AppendSwitch(switches::kChildProcess);
+
+  embedder::HandlePassingInformation handle_passing_info;
+  platform_channel_pair_.PrepareToPassClientHandleToChildProcess(
+      &child_command_line, &handle_passing_info);
+
+  base::LaunchOptions options;
+#if defined(OS_WIN)
+  options.start_hidden = true;
+  options.handles_to_inherit = &handle_passing_info;
+#elif defined(OS_POSIX)
+  options.fds_to_remap = &handle_passing_info;
+#endif
+  DVLOG(2) << "Launching child with command line: "
+           << child_command_line.GetCommandLineString();
+  child_process_ = base::LaunchProcess(child_command_line, options);
+  if (!child_process_.IsValid())
+    return false;
+
+  platform_channel_pair_.ChildProcessLaunched();
+  return true;
+}
+
+}  // namespace shell
+}  // namespace mojo