(***********************************************************************)

(*                                                                     *)

(*                 MLTk, Tcl/Tk interface of OCaml                     *)

(*                                                                     *)

(*    Francois Rouaix, Francois Pessaux, Jun Furuse and Pierre Weis    *)

(*               projet Cristal, INRIA Rocquencourt                    *)

(*            Jacques Garrigue, Kyoto University RIMS                  *)

(*                                                                     *)

(*  Copyright 2002 Institut National de Recherche en Informatique et   *)

(*  en Automatique and Kyoto University.  All rights reserved.         *)

(*  This file is distributed under the terms of the GNU Library        *)

(*  General Public License, with the special exception on linking      *)

(*  described in file LICENSE found in the OCaml source tree.          *)

(*                                                                     *)

(***********************************************************************)

open Unix

(************************************************************* Subshell call *)

let subshell cmd =

  let r,w = pipe () in

    match fork () with

      0 -> close r; dup2 w stdout;

           close stderr;

           execv "/bin/sh" [| "/bin/sh"; "-c"; cmd |]

    | id ->

        close w;

        let rc = in_channel_of_descr r in

        let rec it () = try

            let x = input_line rc in x:: it ()

          with _ -> []

        in

          let answer = it() in

          close_in rc;  (* because of finalize_channel *)

          let _ = waitpid [] id in answer