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(***********************************************************************)
(* *)
(* OCaml *)
(* *)
(* Pierre Weis, projet Cristal, INRIA Rocquencourt *)
(* *)
(* Copyright 2005 Institut National de Recherche en Informatique et *)
(* en Automatique. All rights reserved. This file is distributed *)
(* under the terms of the Q Public License version 1.0. *)
(* *)
(***********************************************************************)
(* A very simple slave:
- read the string " Ping" on stdin,
- then print the string "-pong" on stderr,
- and send it back on stdout
- until reading the string "stop" on stdin,
- then print the string "!\n" on stderr,
- send back the string "OK, bye!" on stdout,
- and die.
Use the communication module Test_scanf2_io. *)
open Tscanf2_io;;
let ib = Scanf.Scanning.from_channel stdin;;
let ob = Buffer.create 1024
and oc = stdout;;
let send_string_pong ob = send_string ob oc "-pong";;
let send_string_okbye ob = send_string ob oc "OK, bye!";;
while true do
let s = receive_string ib in
match s with
| " Ping" -> Printf.eprintf "-pong"; flush stderr; send_string_pong ob
| "stop" -> Printf.eprintf "!\n"; flush stderr; send_string_okbye ob; exit 0
| s -> failwith ("Slave: unbound string " ^ s)
done
;;
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