Base.Rawval on_writable :
Unix.file_descr ->
'a ->
'b ->
(closed:bool -> 'a -> 'b -> unit) ->
unitval on_readable :
Unix.file_descr ->
'a ->
'b ->
(closed:bool -> 'a -> 'b -> unit) ->
unitval retry_read : Unix.file_descr -> (unit -> 'a) -> 'aval retry_write : Unix.file_descr -> (unit -> 'a) -> 'a