[erlang-questions] simple_one_for_one supervisor: strange error when stopping node

Frank Muller <>
Wed Dec 21 18:55:23 CET 2016


Hmm ... I see. Let me triple check then.  Thanks Brujo.

/Frank

Le mer. 21 déc. 2016 à 18:52, Brujo Benavides <
> a écrit :

> Frank:
>
> Maybe it’s just wording, but to clarify just in case:
> Starting children from within a supervisor doesn’t guarantee they’re
> linked.
> Linking to its parent supervisor is a responsibility of the child process.
> In your case, if *client_sock:start_link/0* doesn’t actually start and
> link a process to its caller*, *then your supervisor won’t do it for you
> :)
>
> Cheers!
>
> On Dec 21, 2016, at 14:47, Frank Muller <>
> wrote:
>
> Thank you Alex.
>
> Forgot to mention that I'm using 17.5 on Linux.
> I'm sure all children are linked because they're started using the
> supervisor.
>
> I'll try to narrow that my app and double check.
>
> /Frank
>
> Le mer. 21 déc. 2016 à 18:39, Alex S. <> a écrit :
>
> As a followup, the following insights from OTP 19’s source code:
>
>    %% If a naughty child did unlink and the child dies before
>    %% monitor the result will be that shutdown/2 receives a
>    %% 'DOWN'-message with reason noproc.
>    %% If the child should die after the unlink there
>    %% will be a 'DOWN'-message with a correct reason
>    %% that will be handled in shutdown/2.
>
> 21 дек. 2016 г., в 19:57, Frank Muller <>
> написал(а):
>
> Spent another day fighting with this, no luck.
>
> Even after applying this trick from angner’s repo, I’m still seeing these
> error message:
> https://github.com/agner/agner/blob/master/src/agner_app.erl#L17-L17
>
> Can someone at least (OTP guys) explain me the « why » i’m getting these
> messages please?
>
> /Frank
>
>
>
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