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Re: emacs hangs when changing network while sleeping

From: joakim
Subject: Re: emacs hangs when changing network while sleeping
Date: Sun, 23 Jan 2011 00:46:33 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux)

address@hidden (Rémi Letot) writes:

> Hello,
> when I change network with my laptop sleeping (typical when I commute
> between work and home), my whole emacs session often freezes if gnus is
> there (which is always).
> Not so long ago I just had to kill the openssl processes, which abruptly
> interrupted the connections, and gave me back my emacs.
> Now that ssl is handled by emacs itself, I have no external process to
> kill. And C-g doesn't help, all keystrokes I do seem to accumulate in
> some buffer and are all processed when emacs resurfaces. And it can stay
> frozen quite some time.
> Besides quitting gnus before I commute (which I almost always forget)
> and killing emacs (which is "Not Good"), is there a way to stop this
> from happening ? Shouldn't C-g always work ?
> Thanks,

This happens for me too. I have the following workaround script.
Basically it finds the ip of an open nntp session that is hanging due to
local interface change, and makes a dummy lookalike interface on the
loopback interface. Emacs is then able to determine that the interface
is dead and can recover. 

`lsof -n|grep emacs|grep nntp|sed "s/.*TCP\ \\([^:]*\\):.*->\\([^:].*\\):.*/  
export a=\\1 export b=\\2/"`
echo $a $b
ifconfig lo:1 $a
ifconfig lo:2 $b
echo press enter when emacs is alive
ifconfig lo:1 down
ifconfig lo:2 down

Joakim Verona

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