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bug#17036: Continuation for Emacs: invoking a process on exit?


From: Reuben Thomas
Subject: bug#17036: Continuation for Emacs: invoking a process on exit?
Date: Fri, 21 Mar 2014 10:09:10 +0000

On 21 March 2014 07:53, Eli Zaretskii <address@hidden> wrote:
> Date: Thu, 20 Mar 2014 23:10:19 +0000
> From: Reuben Thomas <address@hidden>
> Cc: Stefan Monnier <address@hidden>, Andreas Schwab <address@hidden>,
>       address@hidden
>
> I'm sorry, I seem to have made a total hash of explaining something really
> simple. In effect, I want kill-emacs-and-exec, which takes a list of
> arguments, runs kill-emacs, and then execs the argument list.

As long as it does what you want, fine.  But please note that this is
not the same as exiting Emacs and starting a new session, because the
original Emacs didn't shut down all the way, and the PID is the same.

I think I'm still being unclear, sorry.

I am assuming that all the regular atexit handlers have already been called, and that Emacs is really about to exit. (That is what I mean by saying that kill-emacs has been run.) So, this could be implemented by ensuring that the first atexit handler to be registered on startup checks a "kill-emacs-and-exec" flag, and if it is set, does the exec. Correspondingly, kill-emacs-and-exec would set the flag, store the arguments in a suitable place, and then tail-call to kill-emacs.

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