Re: [Gauche-devel] IPv6 detection on Raspberry Pi

[Shiro K. <sh...@la...>]

Hmm.  It means sys-getaddrinfo does return ipv6 address but
the system rejects creating v6 socket?  On Linux we may be able
to check /proc/net to do some runtime switching but it's not always
guaranteed to work...   I think the safer bet is to modify gauche.net
to detect EAFNOSUPPORT.

Meanwhile, here are a couple of ideas to workaround.

If you can specify IPv4 address directly to start-http-server,
e.g. (start-http-server :host "127.0.0.1" ...), then ipv6 socket
wouldn't be tried.  Probably the easiest workaround.  If your
machine has multiple IPs or you want to deploy makiki on multiple
servers, this may be cumbersome.

Another one is to monkey-patch gauche.net before calling
start-http-server.  Not generally recommended, but sometimes
just as handy as duct tape.

  (use gauche.net)
  (with-module gauche.net
    (set! ipv6-capable #f))

  (define (main args)
    ...
    (start-http-server ...))



From: Duy Nguyen <pc...@gm...>
Subject: [Gauche-devel] IPv6 detection on Raspberry Pi
Date: Fri, 3 Apr 2015 12:10:40 +0700

> I tried to run gauche-makiki and got this
> 
> $ gosh -I. examples/minimal.scm
> *** SYSTEM-ERROR: couldn't create socket: Address family not supported
> by protocol
> Stack Trace:
> _______________________________________
>   0  (make-server-sockets host port :reuse-addr? #t)
>         At line 510 of "./makiki.scm"
> 
> strace says this happens when PF_INET6 is used, and ipv6-capable in
> gauche.net is #t so it's probably it. Perhaps there's a better way to
> detect this? Or any workaround so I can run makiki without changing
> it?
> -- 
> Duy
> 
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