It seems that the output buffer is not flushed.
Use "flush stdout" after Printf.printf.
For example,

let _ = Printf.printf "ocaml inited\n"; flush stdout
let foo () = Printf.printf "this works\n"; flush stdout

---
SooHyoung Oh
----- Original Message -----
From: "Kip Macy" <kmacy@fsmware.com>
To: <caml-list@inria.fr>
Sent: Monday, January 26, 2004 12:42 PM
Subject: [Caml-list] problem with Printf.printf when linking in bytecode
interpreter to C app


> I've linked the ocaml runtime into my application:
> this is my ocaml.ml:
> let _ = Printf.printf "ocaml inited\n"
>
> let foo () = Printf.printf "this works\n"
>
>
> let rec fib n = if n < 2 then 1 else fib(n-1) + fib(n-2)
>
> let _ = Callback.register "foo" foo
>
> let _ = Callback.register "fib" fib
>
>
> This is the relevant C code:
>     printf("calling caml_startup\n");
>     caml_startup(argv);
>     callback(*caml_named_value("foo"), Val_unit);
>     result = Int_val(callback(*caml_named_value("fib"), Val_int(6)));
>     printf("the result of fib is %d\n", result);
>
>
> The only output I get is:
> calling caml_startup
> the result of fib is 13
>
> Why don't the Printf.printf statements output anything?
>
>
> Thanks.
>
> -Kip
>
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