bug#65577: 29.1; set <signal> <usr1> in global map

bug#65577: 29.1; set <signal> <usr1> in global map

[Shynur Xie]

This report is about the question asked at
<https://lists.gnu.org/archive/html/help-gnu-emacs/2023-08/msg00462.html>.

Reproduce (-Q):

    (keymap-global-set "<signal> <usr1>"
      (lambda ()  ; doesn't work.
        (interactive)
        (message "teeest: signal usr1")))
    (signal-process (emacs-pid) 'sigusr1)
    (keymap-set special-event-map "<sigusr1>"
      (lambda ()  ; does work
        (interactive)
        (message "teeest: sigusr1")))

Is this a documentation bug?  Or am I missing something?


In GNU Emacs 29.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.37,
 cairo version 1.16.0) of 2023-08-19 built on ubuntu
Windowing system distributor 'The X.Org Foundation', version 11.0.12201008
System Description: Ubuntu 23.04

Configured using:
 'configure --without-pop CFLAGS=-O3'

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG
LIBSELINUX LIBSYSTEMD LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG SECCOMP
SOUND THREADS TIFF TOOLKIT_SCROLL_BARS WEBP X11 XDBE XIM XINPUT2 XPM
GTK3 ZLIB

Important settings:
  value of $EMACSLOADPATH: ~/.emacs.d//site-lisp/:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  line-number-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message mailcap yank-media puny dired
dired-loaddefs rfc822 mml mml-sec password-cache epa derived epg rfc6068
epg-config gnus-util text-property-search mm-decode mm-bodies mm-encode
mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047
rfc2045 ietf-drums mm-util mail-prsvr mail-utils time-date subr-x
cl-loaddefs cl-lib rmc iso-transl tooltip cconv eldoc paren electric
uniquify ediff-hook vc-hooks lisp-float-type elisp-mode mwheel
term/x-win x-win term/common-win x-dnd tool-bar dnd fontset image
regexp-opt fringe tabulated-list replace newcomment text-mode lisp-mode
prog-mode register page tab-bar menu-bar rfn-eshadow isearch easymenu
timer select scroll-bar mouse jit-lock font-lock syntax font-core
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theme-loaddefs faces cus-face macroexp files window text-properties
overlay sha1 md5 base64 format env code-pages mule custom widget keymap
hashtable-print-readable backquote threads dbusbind inotify
dynamic-setting system-font-setting font-render-setting cairo
move-toolbar gtk x-toolkit xinput2 x multi-tty make-network-process
emacs)

Memory information:
((conses 16 37385 8260)
 (symbols 48 5131 0)
 (strings 32 13167 2085)
 (string-bytes 1 373867)
 (vectors 16 9306)
 (vector-slots 8 148781 12939)
 (floats 8 33 43)
 (intervals 56 328 261)
 (buffers 976 12))

bug#65577: 29.1; set <signal> <usr1> in global map

[Eli Zaretskii]

> From: Shynur Xie <one.last.kiss@outlook.com>
> Date: Mon, 28 Aug 2023 07:29:20 +0000
> msip_labels: 
> 
> This report is about the question asked at
> <https://lists.gnu.org/archive/html/help-gnu-emacs/2023-08/msg00462.html>.
> 
> Reproduce (-Q):
> 
>     (keymap-global-set "<signal> <usr1>"
>       (lambda ()  ; doesn't work.
>         (interactive)
>         (message "teeest: signal usr1")))
>     (signal-process (emacs-pid) 'sigusr1)
>     (keymap-set special-event-map "<sigusr1>"
>       (lambda ()  ; does work
>         (interactive)
>         (message "teeest: sigusr1")))
> 
> Is this a documentation bug?  Or am I missing something?

Stefan, it sounds like the first example is some left-over from old
handling of signals?  I don't see a "function key" named 'signal'
bound anywhere in the global map.  So the 1st example above should
only work if 'signal' is a prefix key bound in the global-map, right?

  (keymap-lookup global-map "<f1>")
    => help-command

but

  (keymap-lookup global-map "<signal>")
    => nil

bug#65577: 29.1; set <signal> <usr1> in global map

[Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors]

> Stefan, it sounds like the first example is some left-over from old
> handling of signals?

Something like that, yes.  It's definitely not going to work :-(


        Stefan

bug#65577: 29.1; set <signal> <usr1> in global map

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: Shynur Xie <one.last.kiss@outlook.com>,  65577@debbugs.gnu.org
> Date: Thu, 31 Aug 2023 08:54:01 -0400
> 
> > Stefan, it sounds like the first example is some left-over from old
> > handling of signals?
> 
> Something like that, yes.  It's definitely not going to work :-(

Thanks, I removed this example from the manual, and I'm now closing
this bug.