in which keymap to set SIGUSR-handler

in which keymap to set SIGUSR-handler

[Shynur Xie]

Hi, friends.  I'm reading the elisp manual.  In 22.7.12 Miscellaneous
System Events
(<https://gnu.org/s/emacs/manual/html_node/elisp/Misc-Events.html>),
there's a sample code about SIGUSR:

    (keymap-set special-event-map "<sigusr1>" 'sigusr-handler)

In 22.7.13 Event Examples
(<https://gnu.org/s/emacs/manual/html_node/elisp/Event-Examples.html>)
there's another one:

    (keymap-global-set "<signal> <usr1>" 'usr1-handler)

Which one should I use in my init file?  Thanks in advance.

Re: in which keymap to set SIGUSR-handler

[Eli Zaretskii]

> From: Shynur Xie <one.last.kiss@outlook.com>
> Date: Sun, 27 Aug 2023 16:54:25 +0000
> msip_labels: 
> 
> Hi, friends.  I'm reading the elisp manual.  In 22.7.12 Miscellaneous
> System Events
> (<https://gnu.org/s/emacs/manual/html_node/elisp/Misc-Events.html>),
> there's a sample code about SIGUSR:
> 
>     (keymap-set special-event-map "<sigusr1>" 'sigusr-handler)
> 
> In 22.7.13 Event Examples
> (<https://gnu.org/s/emacs/manual/html_node/elisp/Event-Examples.html>)
> there's another one:
> 
>     (keymap-global-set "<signal> <usr1>" 'usr1-handler)
> 
> Which one should I use in my init file?  Thanks in advance.

They should both work.  Did you try?

Re: in which keymap to set SIGUSR-handler

[Shynur Xie]

The second one doesn't work:

    (keymap-global-set "<signal> <usr1>"
                       (lambda ()
                         (interactive)
                         (message "-*-*-*-")))
    (signal-process (emacs-pid) 'sigusr1)

Am I missing something?

emacs-version: 30.0.50
system-configuration: x86_64-pc-linux-gnu

Re: in which keymap to set SIGUSR-handler

[Eli Zaretskii]

> From: Shynur Xie <one.last.kiss@outlook.com>
> CC: "help-gnu-emacs@gnu.org" <help-gnu-emacs@gnu.org>
> Date: Sun, 27 Aug 2023 18:18:37 +0000
> 
> The second one doesn't work:
> 
>     (keymap-global-set "<signal> <usr1>"
>                        (lambda ()
>                          (interactive)
>                          (message "-*-*-*-")))
>     (signal-process (emacs-pid) 'sigusr1)
> 
> Am I missing something?

If you are sure you did everything right, submit a bug report.

Re: in which keymap to set SIGUSR-handler

[Emanuel Berg]

Shynur Xie wrote:

> (keymap-global-set "<signal> <usr1>" 'usr1-handler)
>
> Which one should I use in my init file?  Thanks in advance.

Try this:

;;; -*- lexical-binding: t -*-
;;
;; this file:
;;   https://dataswamp.org/~incal/emacs-init/signal.el
;;
;; test from Emacs:
;;   (signal-process (emacs-pid) 'sigusr1)
;;
;; test from zsh:
;;   $ kill -s usr1 $(pidof emacs)

(defun signal-usr1-f ()
  (interactive)
  (message "USR1 signal") )

(define-key special-event-map [sigusr1] #'signal-usr1-f)

(provide 'signal)

-- 
underground experts united
https://dataswamp.org/~incal