Re: (machine-instance) possibly blocking execution

> * Jean Louis <[email protected]> [2017-01-02 09:46:39 +0300]:
>
> I have noticed that (machine-instance) on a computer without Internet
> connection, or where Internet was enabled, but on the router the
> forwarding was disabled, was blocking the execution of the command,
> possibly indefinitely. It was just waiting.
>
> When Internet on the routing computer was enabled for the internal
> computer, the command could run properly.
>
> I guess that it is using DNS in background, but I cannot know it.

Indeed machine-instance calls gethostbyname() on the first invocation.

I don't think this is wrong: gethostbyname() taking non-trivial time
is a sign of a system problem: either mis-configuration or an temporary
connection problem.

You can disable this feature by editing socket.d:machine_instance:

--8<---------------cut here---------------start------------->8---
diff -r 3e5919c338db src/socket.d
--- a/src/socket.d	Fri Nov 11 18:19:42 2016 +0100
+++ b/src/socket.d	Tue Jan 03 10:33:06 2017 -0500
@@ -131,7 +131,7 @@ LISPFUNN(machine_instance,0)
     var char host[MAXHOSTNAMELEN+1];
     get_hostname(host);
     result = asciz_to_string(host,O(misc_encoding)); /* hostname as result */
-   #ifdef HAVE_GETHOSTBYNAME
+   #ifdef HAVE_GETHOSTBYNAME_DISABLE
     pushSTACK(result); /* hostname as 1st string */
     {
       var uintC stringcount = 1;
--8<---------------cut here---------------end--------------->8---


-- 
Sam Steingold (http://sds.podval.org/) on darwin Ns 10.3.1504
http://steingoldpsychology.com http://www.childpsy.net
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