chrome/browser/storage_monitor/udev_util_linux.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROME_BROWSER_STORAGE_MONITOR_UDEV_UTIL_LINUX_H_
   6 #define CHROME_BROWSER_STORAGE_MONITOR_UDEV_UTIL_LINUX_H_
   7
   8 #include <libudev.h>
   9
  10 #include <string>
  11
  12 #include "base/memory/scoped_generic_obj.h"
  13
  14 namespace base {
  15 class FilePath;
  16 }
  17
  18 namespace chrome {
  19
  20 // ScopedGenericObj functor for UdevObjectRelease().
  21 class ScopedReleaseUdevObject {
  22  public:
  23   void operator()(struct udev* udev) const {
  24     udev_unref(udev);
  25   }
  26 };
  27 typedef ScopedGenericObj<struct udev*,
  28                          ScopedReleaseUdevObject> ScopedUdevObject;
  29
  30 // ScopedGenericObj functor for UdevDeviceObjectRelease().
  31 class ScopedReleaseUdevDeviceObject {
  32  public:
  33   void operator()(struct udev_device* device) const {
  34     udev_device_unref(device);
  35   }
  36 };
  37 typedef ScopedGenericObj<struct udev_device*,
  38                          ScopedReleaseUdevDeviceObject> ScopedUdevDeviceObject;
  39
  40 // Wrapper function for udev_device_get_property_value() that also checks for
  41 // valid but empty values.
  42 std::string GetUdevDevicePropertyValue(struct udev_device* udev_device,
  43                                        const char* key);
  44
  45 // Helper for udev_device_new_from_syspath()/udev_device_get_property_value()
  46 // pair. |device_path| is the absolute path to the device, including /sys.
  47 bool GetUdevDevicePropertyValueByPath(const base::FilePath& device_path,
  48                                       const char* key,
  49                                       std::string* result);
  50
  51 }  // namespace chrome
  52
  53 #endif  // CHROME_BROWSER_STORAGE_MONITOR_UDEV_UTIL_LINUX_H_