[erlang-questions] erlang gen_tcp:connect/3 not working with rpc:call/4, anyone knows why?

Allen Kim <>
Thu Sep 22 21:53:46 CEST 2011


Thanks Magnus, and that works

BUT, it does not make sense to me.

errrrr, Mac, why don't you work like others?

~$ssh   'nohup erl -name  -detached -setcookie loadtest'
~$ps aux | grep loadtest
allen     4137   0.5  0.1  2454316  10104   ??  S     3:49pm   0:00.12 /opt/local/lib/erlang/erts-5.8.4/bin/beam.smp -- -root /opt/local/lib/erlang -progname erl -- -home /Users/allen -- -name  -noshell -noinput -setcookie loadtest
allen     3219   0.0  0.0  2435328   1440 s002  S+    2:46pm   0:00.17 ssh 
allen     4139   0.0  0.0  2435116    524 s005  S+    3:49pm   0:00.00 grep loadtest
~$erl -name  -setcookie loadtest
Erlang R14B03 (erts-5.8.4) [source] [64-bit] [smp:2:2] [rq:2] [async-threads:0] [hipe] [kernel-poll:false]

Eshell V5.8.4  (abort with ^G)
()1> net_adm:ping('').
pong
()2> gen_tcp:connect("www.google.com",80,[]).
{ok,#Port<0.633>}
()3> rpc:call('',gen_tcp,connect,["www.google.com",80,[]]).
{ok,#Port<5895.487>}
()4>

Allen Kim

From: Magnus Klaar <<mailto:>>
Date: Thu, 22 Sep 2011 09:53:45 -0500
To: Allen Kim <<mailto:>>
Cc: Kaiduan Xie <<mailto:>>, "<mailto:>" <<mailto:>>
Subject: Re: [erlang-questions] erlang gen_tcp:connect/3 not working with rpc:call/4, anyone knows why?

Hi!

If it uses native lookups we can assume that getaddrinfo is broken when it is called from the detached node.
This narrows down the search for the cause of this issue to a more general problem with getaddrinfo on os-x,
leading us to this thread:

http://lists.apple.com/archives/unix-porting/2010/Jul/msg00001.html

You could try just adding nohup to the command that you're executing using ssh. Although i have a hard
time seeing how this would work. An erlang node started with -detached should ignore HUP signals (afaik).

MVH Magnus

On Wed, Sep 21, 2011 at 8:48 PM, Allen Kim <<mailto:>> wrote:
I don't see any difference from outputs from the following commands.
It both uses native lookup.
Anyway, it is not a big deal since I do not use Mac for staging nor production. it's only for development.

However, I hope it's better to be consistent on all kind of *nix environment.
Or, it could be me only.

Any Mac user who what to test this?



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