Use epoll to monitor sysfs in carpowerpolicyd

- inotify doesn't work for sysfs files. Instead, epoll should be used.
- SilentModeHandlerTest#TestSilentModeHwStateMonitoring is removed
because sysfs or socket file cannot be created by unit tests.
- pm_silentmode_kernel is renamed to pm_silentmode_kernel_state.
- SysfsMonitor will be wrapped by jni to serve CarPowerManagementService
in the coming CL.

Bug: 178843534
Test: atest carpowerpolicyserver_test libsysfsmonitor_test
Change-Id: I1f34487ae4bba9a9b9c9fdee60dd17c922585450
Merged-In: I1f34487ae4bba9a9b9c9fdee60dd17c922585450
(cherry picked from commit 01a3e598b912375eb62b671caf9ba29251975de1)
9 files changed
tree: 350c33f08e3259338090afcb2af6c8657a99acb4
  1. car-admin-ui-lib/
  2. car-internal-lib/
  3. car-lib/
  4. car-maps-placeholder/
  5. car-systemtest-lib/
  6. car-test-lib/
  7. car-usb-handler/
  8. car_product/
  9. cpp/
  10. data/
  11. experimental/
  12. FrameworkPackageStubs/
  13. obd2-lib/
  14. packages/
  15. procfs-inspector/
  16. service/
  17. tests/
  18. tools/
  19. user/
  20. vehicle-hal-support-lib/
  21. .clang-format
  22. .gitignore
  23. Android.mk
  24. CleanSpec.mk
  25. CPPLINT.cfg
  26. OWNERS
  27. PREUPLOAD.cfg
  28. README.md
  29. TEST_MAPPING
README.md

Native (C++) code format is required to be compatible with .clang-format file. Run

git clang-format --style=file --extension='h,cpp,cc' HEAD~

Note that clang-format is not desirable for Android java files. Therefore the command line above is limited to specific extensions.