For callback-based event loops, this is the prototype of the function
that is called when a file descriptor event occurs.
It is given the file descriptor it is associated with,
a bitmask of the poll events that were triggered (typically ALOOPER_EVENT_INPUT),
and the data pointer that was originally supplied.
Implementations should return 1 to continue receiving callbacks, or 0
to have this file descriptor and callback unregistered from the looper.
For callback-based event loops, this is the prototype of the function that is called when a file descriptor event occurs. It is given the file descriptor it is associated with, a bitmask of the poll events that were triggered (typically ALOOPER_EVENT_INPUT), and the data pointer that was originally supplied.
Implementations should return 1 to continue receiving callbacks, or 0 to have this file descriptor and callback unregistered from the looper.