(PECL libevent >= 0.0.4)
event_buffer_set_callback — Set or reset callbacks for a buffered event
Sets or changes existing callbacks for the buffered event.
Valid buffered event resource.
Callback to invoke where there is data to read, or NULL if no callback is desired.
Callback to invoke where the descriptor is ready for writing, or NULL if no callback is desired.
Callback to invoke where there is an error on the descriptor, cannot be NULL.
An argument that will be passed to each of the callbacks (optional).
Returns TRUE on success or FALSE on failure.