`sig
val accesslog : string -> unit
val errlog : ?section:Lwt_log.section -> string -> unit
val warning : ?section:Lwt_log.section -> string -> unit
val console : (unit -> string) -> unit
val unexpected_exception : exn -> string -> unit
val error_log_path : unit -> string
val open_files :
?user:string option -> ?group:string option -> unit -> unit Lwt.t
val command_f : exn -> string -> string list -> unit Lwt.t
end`