module Fd_by_descr:sig..end
Fd_by_descr is a table of the open Fd.ts, indexed by file descriptor number.
In this interface, we use Raw_fd.t rather than Fd.t to avoid a dependency cycle,
because the Fd module can't be defined yet.
type t
val sexp_of_t : t -> Sexplib.Sexp.tval invariant : t -> unitval create : num_file_descrs:int -> tval add : t -> Raw_fd.t -> unitval find : t -> Import.File_descr.t -> Raw_fd.t optionval remove : t -> Raw_fd.t -> unit