GNU bug report logs - #53191
29.0.50; file-notify-add-watch fails for socket files on MacOS

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: "Troy de Freitas" <me <at> ntdef.com>
Subject: bug#53191: closed (Re: bug#53191: 29.0.50; file-notify-add-watch
 fails for socket files on MacOS)
Date: Sat, 15 Jan 2022 17:38:02 +0000

[Message part 1 (text/plain, inline)]

Your bug report

#53191: 29.0.50; file-notify-add-watch fails for socket files on MacOS

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 53191 <at> debbugs.gnu.org.

-- 
53191: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=53191
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Troy de Freitas <me <at> ntdef.com>
Cc: 53191-done <at> debbugs.gnu.org
Subject: Re: bug#53191: 29.0.50; file-notify-add-watch fails for socket
 files on MacOS
Date: Sat, 15 Jan 2022 18:37:45 +0100

Troy de Freitas <me <at> ntdef.com> writes:

> Hi Michael,

Hi Troy,

> Thanks for looking into this. Actually, all I wanted was to be able to see when the socket file was deleted.

So watching the parent directory would suffice, indeed. There's nothing
left to do; I'm closing the bug.

> Regards,
> Troy de Freitas

Best regards, Michael.

[Message part 3 (message/rfc822, inline)]

From: "Troy de Freitas" <me <at> ntdef.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.0.50; file-notify-add-watch fails for socket files on MacOS
Date: Tue, 11 Jan 2022 10:22:01 -0600

This bug affects MacOS (and most likely FreeBSD and OpenBSD as well).
On MacOS running `file-notify-add-watch' throws an error when attached to a UNIX socket
file but works fine on Linux. To reproduce, using 'emacs -Q', evaluate the following elisp:

    (let* ((sock "/tmp/netproc.sock")
           (p (make-network-process
               :name "test"
               :family 'local
               :local sock
               :server t)))
      (unwind-protect
          (file-notify-add-watch sock '(change)
                                 (lambda (_) (message (format "%s changed." sock))))
        (delete-process p)
        (delete-file sock)))

It throws the error:

   edebug-signal: File cannot be opened: Operation not supported on
   socket, /tmp/netproc.sock

The issue appears to be in the underlying call to `kqueue-add-watch',
which uses `openat()' (by way of `emacs_open()`) to get a
file-descriptor. According to the BSD docs for `openat()', calling
`openat()' on socket files is not supported.

In GNU Emacs 29.0.50 (build 1, aarch64-apple-darwin20.6.0, NS appkit-2022.60 Version 11.5.1 (Build 20G80))
 of 2021-10-26 built on C02FW2L5Q05P
Windowing system distributor 'Apple', version 10.3.2113
System Description:  macOS 12.1

Configured using:
 'configure --disable-dependency-tracking --disable-silent-rules
 --enable-locallisppath=/opt/homebrew/share/emacs/site-lisp
 --infodir=/opt/homebrew/Cellar/emacs-plus <at> 29/29.0.50/share/info/emacs
 --prefix=/opt/homebrew/Cellar/emacs-plus <at> 29/29.0.50 --with-xml2
 --with-gnutls --without-dbus --with-imagemagick --with-modules
 --with-rsvg --with-ns --disable-ns-self-contained'

Configured features:
ACL GIF GLIB GMP GNUTLS IMAGEMAGICK JPEG JSON LCMS2 LIBXML2 MODULES
NOTIFY KQUEUE NS PDUMPER PNG RSVG THREADS TIFF TOOLKIT_SCROLL_BARS WEBP
XIM ZLIB

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8

Major mode: Elisp

Minor modes in effect:
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  global-anzu-mode: t
  anzu-mode: t
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  flycheck-mode: t
  diredfl-global-mode: t
  savehist-mode: t
  electric-pair-mode: t
  delete-selection-mode: t
  global-auto-revert-mode: t
  global-so-long-mode: t
  mode-line-bell-mode: t
  beacon-mode: t
  global-page-break-lines-mode: t
  page-break-lines-mode: t
  whole-line-or-region-global-mode: t
  whole-line-or-region-local-mode: t
  hes-mode: t
  which-key-mode: t
  global-whitespace-cleanup-mode: t
  whitespace-cleanup-mode: t
  global-diff-hl-mode: t
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  ipretty-mode: t
  auto-compile-on-load-mode: t
  auto-compile-on-save-mode: t
  auto-compile-mode: t
  immortal-scratch-mode: t
  envrc-global-mode: t
  envrc-mode: t
  marginalia-mode: t
  repeat-mode: t
  desktop-save-mode: t
  corfu-global-mode: t
  corfu-mode: t
  ns-auto-titlebar-mode: t
  override-global-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t


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Memory information:
((conses 16 1524406 530432)
 (symbols 48 81700 151)
 (strings 32 312418 63333)
 (string-bytes 1 12192584)
 (vectors 16 133974)
 (vector-slots 8 2581686 711833)
 (floats 8 1701 7648)
 (intervals 56 36559 8126)
 (buffers 992 93))


- Troy
me <at> ntdef.com

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