API for Eio backends only.
type Effect.t += | Await_readable : Unix.file_descr -> unit Effect.t| Await_writable : Unix.file_descr -> unit Effect.t| Get_monotonic_clock : Eio.Time.Mono.ty Eio.Std.r Effect.t| Pipe : Eio.Switch.t -> (source_ty Eio.Std.r * sink_ty Eio.Std.r) Effect.t
module Rcfd : sig ... endA safe wrapper around Unix.file_descr.
module Fork_action : sig ... endActions to perform after forking a child process.
module Thread_pool : sig ... endA pool of systhreads, to avoid the overhead of creating a new thread for each operation.
val read_link : Fd.t option -> string -> stringval read_link_unix : Unix.file_descr option -> string -> string