timerfd APIs are only available as SYS_* calls
As Android is linux, these should be available too.

Should they be added?

List of APIs:

• timerfd_create
• timerfd_settime
• timerfd_gettime

That's and various definitions like TFD_NONBLOCK

Reference http://man7.org/linux/man-pages/man2/timerfd_create.2.html