(* OS.Process -- SML Basis Library *) eqtype status val success   : statusval failure   : status val system    : string -> status val atExit    : (unit -> unit) -> unitval exit      : status -> 'aval terminate : status -> 'a val getEnv    : string -> string option (*    Portable functions for manipulating processes.    [success] is the unique status value that signifies successful   termination of a process.  Note: MS DOS (sometimes) believes that   all processes are successful.    [failure] is a status value that signifies an error during   execution of a process.  Note that in contrast to the success   value, there may be several distinct failure values.    [system cmd] asks the operating system to execute command cmd, and   returns a status value.    [atExit act] registers the action act to be executed when the   current SML program calls Process.exit.  Actions will be executed   in reverse order of registration.    [exit i] executes all registered actions, then terminates the SML   process with completion code i.    [terminate i] terminates the SML process with completion code i    (but without executing the registered actions).    [getEnv evar] returns SOME s if the environment variable evar is   defined and is associated with the string s; otherwise NONE.*)