28 lines
838 B
OCaml
28 lines
838 B
OCaml
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(* A very simple slave:
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- read the string " Ping" on stdin,
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- then print the string "-pong" on stderr,
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- and send it back on stdout
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- until reading the string "stop" on stdin,
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- then print the string "!\n" on stderr,
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- send back the string "OK, bye!" on stdout,
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- and die.
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Use the communication module Test_scanf_io. *)
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open Tscanf2_io;;
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let ib = Scanf.Scanning.from_channel stdin;;
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let ob = Buffer.create 1024
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and oc = stdout;;
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let send_string_pong ob = send_string ob oc "-pong";;
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let send_string_okbye ob = send_string ob oc "OK, bye!";;
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while true do
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let s = receive_string ib in
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match s with
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| " Ping" -> Printf.eprintf "-pong"; flush stderr; send_string_pong ob
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| "stop" -> Printf.eprintf "!\n"; flush stderr; send_string_okbye ob; exit 0
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| s -> failwith ("Slave: unbound string " ^ s)
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done;;
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