module Passwd: sig .. end
Structure of entries in the passwd database
type 
|    | name :string; | 
|    | passwd :string; | 
|    | uid :int; | 
|    | gid :int; | 
|    | gecos :string; | 
|    | dir :string; | 
|    | shell :string; | 
}
val getbyname : string -> t option
val getbyname_exn : string -> t
val getbyuid : int -> t option
val getbyuid_exn : int -> t
val getpwents : unit -> t list
getpwents is a thread-safe wrapper over the low-level passwd database
      functions.
module Low_level: sig .. end
val t_of_sexp : Sexplib.Sexp.t -> t
val sexp_of_t : t -> Sexplib.Sexp.t
getpwents is a thread-safe wrapper over the low-level passwd database
      functions.