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bug#41234: 27.0.91; Synchronous network requests are failing with “Name
From: |
Lars Ingebrigtsen |
Subject: |
bug#41234: 27.0.91; Synchronous network requests are failing with “Name or service not known” |
Date: |
Mon, 20 Jul 2020 12:53:12 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
Dmitry Alexandrov <dag@gnui.org> writes:
> (make-network-process :name " *net-test*"
> :buffer (get-buffer-create "
> *net-test*")
> :host "gnu.org" :service 80
> :nowait nil)
> ;; Debugger entered--Lisp error: (error "gnu.org/80 Name or service not
> known")
>
> More specifically, a call to getaddrinfo() in ‘network_lookup_address_info_1’
> returns EAI_NONAME.
>
> Could it be a problem in GNU Emacs, or have I broken my system somehow?
Dmitry Alexandrov <dag@gnui.org> writes:
> FWIW, strace suggests, that the problematic Emacs process is trying to
> connect to an outdated nameserver (from a LAN this machine was
> connected once):
[...]
> That is, that /etc/resolv.conf had not been reread (there is nothing
> about it in the skipped output above), while the instance that is
> working fine do check whether /etc/resolv.conf is updated:
Hm... since the async lookups work, I guess this means that
getaddrinfo_a works, but getaddrinfo doesn't? Which is very odd -- both
functions are supposed to update the name server etc in the same way, I
think?
So I'm not sure how this can be an Emacs bug -- as far as I know,
there's no way for libc clients to say "update all the DNS stuff now";
it's supposed to happen automatically when you call getaddrinfo. (If
I'm wrong, somebody please correct me.)
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no