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Message-ID: <1395696533.27397.36.camel@zotac>
From: Gerd Stolpmann <info@gerd-stolpmann.de>
To: Johan Grande <johan.grande@ens-cachan.org>
Cc: caml users <caml-list@inria.fr>
Date: Mon, 24 Mar 2014 22:28:53 +0100
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Subject: Re: [Caml-list] Child process doesn't terminate


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Am Montag, den 24.03.2014, 19:23 +0100 schrieb Johan Grande:
> Hi,
>=20
> In the following program, the child process "cat" never terminates. I=20
> don't understand why; can anyone tell me?

Because outdescr isn't closed in the child. Set the close-on-exec flag
on it.

Gerd


> ~~~
> let _ =3D
>    let open Unix in
>    let indescr, outdescr =3D pipe () in
>    let outchan =3D out_channel_of_descr outdescr in
>    let pid =3D
>      create_process "/bin/cat" [|"cat"|]
>        indescr  stdout  stderr
>    in
>    Printf.fprintf outchan "Hello!\n%!";
>    close indescr;
>    close outdescr;
>    ignore (waitpid [] pid)  (* stuck here *)
> ~~~
>=20
> --=20
> Johan Grande
>=20

--=20
------------------------------------------------------------
Gerd Stolpmann, Darmstadt, Germany    gerd@gerd-stolpmann.de
My OCaml site:          http://www.camlcity.org
Contact details:        http://www.camlcity.org/contact.html
Company homepage:       http://www.gerd-stolpmann.de
------------------------------------------------------------

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