Interrupting an emacs server from outside emacs

Interrupting an emacs server from outside emacs

[Renaud Casenave-Péré]

Hi,

I am trying to control emacs from outside, and while it is quite easy to execute
a command using emacsclient --eval, if that command is stuck for whatever
reason, I would like to be able to interrupt it, as I would type C-g from emacs,
but remotely.

for example, if I execute this from a terminal:

emacsclient -e "(sleep-for 50)"

I would like to be able to cancel the sleep command from the terminal like this:

emacsclient -e "(keyboard-quit)"

or something. Being called keyboard-quit, I know it wasn't designed to be used
from the terminal, but this being emacs, surely there is way? Using emacsclient
or with unix signals, or something else.

Does anybody know such a trick?


Thanks,

-- 
Renaud Casenave-Péré

Re: Interrupting an emacs server from outside emacs

[Julien Danjou]

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On Thu, May 16 2013, Renaud Casenave-Péré wrote:

> I am trying to control emacs from outside, and while it is quite easy to execute
> a command using emacsclient --eval, if that command is stuck for whatever
> reason, I would like to be able to interrupt it, as I would type C-g from emacs,
> but remotely.
>
> for example, if I execute this from a terminal:
>
> emacsclient -e "(sleep-for 50)"
>
> I would like to be able to cancel the sleep command from the terminal like this:
>
> emacsclient -e "(keyboard-quit)"
>
> or something. Being called keyboard-quit, I know it wasn't designed to be used
> from the terminal, but this being emacs, surely there is way? Using emacsclient
> or with unix signals, or something else.
>
> Does anybody know such a trick?

IIRC, it has already been discussed on this list.
I think you're looking for `debug-on-event' which by default allow you
to send SIGUSR2 to emacs to get a debug backtrace.

-- 
Julien Danjou
// Free Software hacker / freelance consultant
// http://julien.danjou.info

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Re: Interrupting an emacs server from outside emacs

[Renaud Casenave-Péré]

On Thu, May 16 2013, Julien Danjou wrote:

> IIRC, it has already been discussed on this list.
> I think you're looking for `debug-on-event' which by default allow you
> to send SIGUSR2 to emacs to get a debug backtrace.

Well… It does work.
This would need some cleanup as it enters the debugger, but a simple

emacsclient -e "(exit-recursive-edit)"

seems to do the trick.
I will keep this solution if nobody objects.

Thanks for the quick reply!

-- 
Renaud Casenave-Péré