arc: Create intermediate directories in c/b/c/arc

chrome/browser/chromeos/arc/arc_process_service.h

-// Copyright 2016 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.
-
-#ifndef CHROME_BROWSER_CHROMEOS_ARC_ARC_PROCESS_SERVICE_H_
-#define CHROME_BROWSER_CHROMEOS_ARC_ARC_PROCESS_SERVICE_H_
-
-#include <map>
-#include <vector>
-
-#include "base/callback.h"
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/weak_ptr.h"
-#include "base/process/process_iterator.h"
-#include "base/single_thread_task_runner.h"
-#include "base/threading/thread.h"
-#include "chrome/browser/chromeos/arc/arc_process.h"
-#include "components/arc/arc_service.h"
-#include "components/arc/common/process.mojom.h"
-#include "components/arc/instance_holder.h"
-#include "mojo/public/cpp/bindings/array.h"
-
-namespace arc {
-
-class ArcBridgeService;
-
-// A single global entry to get a list of ARC processes.
-//
-// Call RequestAppProcessList() / RequestSystemProcessList() on the main UI
-// thread to get a list of all ARC app / system processes. It returns
-// vector<arc::ArcProcess>, which includes pid <-> nspid mapping.
-// Example:
-//   void OnUpdateProcessList(const vector<arc::ArcProcess>&) {...}
-//
-//   arc::ArcProcessService* arc_process_service =
-//       arc::ArcProcessService::Get();
-//   if (!arc_process_service ||
-//       !arc_process_service->RequestAppProcessList(
-//           base::Bind(&OnUpdateProcessList)) {
-//     LOG(ERROR) << "ARC process instance not ready.";
-//   }
-//
-// [System Process]
-// The system process here is defined by the scope. If the process is produced
-// under system_server in Android, we regard it as one of Android app process.
-// Otherwise, the processes that are introduced by init would then be regarded
-// as System Process. RequestAppProcessList() is responsible for app processes
-// while RequestSystemProcessList() is responsible for System Processes.
-class ArcProcessService
-    : public ArcService,
-      public InstanceHolder<mojom::ProcessInstance>::Observer {
- public:
-  using RequestProcessListCallback =
-      base::Callback<void(const std::vector<ArcProcess>&)>;
-
-  explicit ArcProcessService(ArcBridgeService* bridge_service);
-  ~ArcProcessService() override;
-
-  // Returns nullptr before the global instance is ready.
-  static ArcProcessService* Get();
-
-  // InstanceHolder<mojom::ProcessInstance>::Observer overrides.
-  void OnInstanceReady() override;
-
-  // Returns true if ARC IPC is ready for process list request,
-  // otherwise false.
-  bool RequestAppProcessList(RequestProcessListCallback callback);
-  void RequestSystemProcessList(RequestProcessListCallback callback);
-
-  using PidMap = std::map<base::ProcessId, base::ProcessId>;
-
-  class NSPidToPidMap : public base::RefCountedThreadSafe<NSPidToPidMap> {
-   public:
-    NSPidToPidMap();
-    base::ProcessId& operator[](const base::ProcessId& key) {
-      return pidmap_[key];
-    }
-    const base::ProcessId& at(const base::ProcessId& key) const {
-      return pidmap_.at(key);
-    }
-    PidMap::size_type erase(const base::ProcessId& key) {
-      return pidmap_.erase(key);
-    }
-    PidMap::const_iterator begin() const { return pidmap_.begin(); }
-    PidMap::const_iterator end() const { return pidmap_.end(); }
-    PidMap::const_iterator find(const base::ProcessId& key) const {
-      return pidmap_.find(key);
-    }
-    void clear() { pidmap_.clear(); }
-
-   private:
-    friend base::RefCountedThreadSafe<NSPidToPidMap>;
-    ~NSPidToPidMap();
-
-    PidMap pidmap_;
-    DISALLOW_COPY_AND_ASSIGN(NSPidToPidMap);
-  };
-
- private:
-  void OnReceiveProcessList(
-      const RequestProcessListCallback& callback,
-      const mojo::Array<mojom::RunningAppProcessInfoPtr> instance_processes);
-
-  scoped_refptr<base::SingleThreadTaskRunner> GetTaskRunner();
-
-  // There are some expensive tasks such as traverse whole process tree that
-  // we can't do it on the UI thread. Thus we need an additional thread to
-  // handle
-  // such tasks.
-  base::Thread heavy_task_thread_;
-
-  // Keep a cache pid mapping of all arc processes so to minimize the number of
-  // nspid lookup from /proc/<PID>/status.
-  // To play safe, always modify |nspid_to_pid_| on the |heavy_task_thread_|.
-  scoped_refptr<NSPidToPidMap> nspid_to_pid_;
-
-  // Always keep this the last member of this class to make sure it's the
-  // first thing to be destructed.
-  base::WeakPtrFactory<ArcProcessService> weak_ptr_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(ArcProcessService);
-};
-
-}  // namespace arc
-
-#endif  // CHROME_BROWSER_CHROMEOS_ARC_ARC_PROCESS_SERVICE_H_