GNU bug report logs - #22225
25.0.50; stop-process appears to have no effect on Linux

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: raman <raman <at> google.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 25.0.50; stop-process appears to have no effect on Linux 
Date: Tue, 22 Dec 2015 12:57:52 -0800

To Repro:

emacs -q

In a scratch buffer:

(setq  proc 
       (let ((process-type nil))
         (start-process "mplayer" "mplayer" "mplayer"
                         "<my-mp3-file>")))

(process-status proc) verify it's running
(stop-process proc) ;; no-op

mplayer does respond to C-c C-z in a shell.




In GNU Emacs 25.0.50.1 (x86_64-unknown-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2015-11-22
Repository revision: 236ce81006eed89152a7f3226978c79add555794
Windowing system distributor 'The X.Org Foundation', version 11.0.11701000
System Description:	Ubuntu 14.04 LTS

Configured using:
 'configure --enable-silent-rules --with-x-toolkit=lucid --with-modules
 --without-compress-install'

Configured features:
XAW3D XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF
GSETTINGS NOTIFY LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT
ZLIB TOOLKIT_SCROLL_BARS LUCID X11 MODULES

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Summary

Minor modes in effect:
  recentf-mode: t
  TeX-PDF-mode: t
  savehist-mode: t
  save-place-mode: t
  midnight-mode: t
  ido-everywhere: t
  diff-auto-refine-mode: t
  display-time-mode: t
  auto-insert-mode: t
  jabber-activity-mode: t
  jabber-mode-line-mode: t
  dynamic-completion-mode: t
  dired-omit-mode: t
  shell-dirtrack-mode: t
  global-voice-lock-mode: t
  voice-lock-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
  buffer-read-only: t
  transient-mark-mode: t
  abbrev-mode: t

Recent messages:
Hid 3  citation lines
Starting message *unsent reply to John Wiegley* ... done
Sending...
Sending via mail...
ad-handle-definition: `expand-mail-aliases' got redefined
Sending email 
Sending email done
Saving file /home/raman/Mail/archive/sent/2015-12...
Wrote /home/raman/Mail/archive/sent/2015-12
Sending...done

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jabber-xml jabber-menu jabber-util org-rmail org-mhe org-irc org-info
org-gnus org-docview doc-view jka-compr image-mode org-bibtex
emacspeak-bibtex bibtex org-bbdb org-w3m emacspeak-company company
slime-fancy slime-trace-dialog slime-fontifying-fu slime-package-fu
slime-references slime-compiler-notes-tree slime-presentations bridge
slime-mdot-fu slime-enclosing-context slime-fuzzy slime-fancy-trace
slime-fancy-inspector slime-c-p-c slime-autodoc slime-asdf grep
slime-editing-commands slime-xref-browser tree-widget slime-repl elp
slime-parse slime-scratch emacspeak-slime slime emacspeak-gud gud
apropos emacspeak-compile compile etags emacspeak-xref xref project
emacspeak-arc arc-mode archive-mode hyperspec emacspeak-tcl tcl hydra-ox
emacspeak-muggles whitespace emacspeak-m-player emacspeak-amark ladspa
emacspeak-org org-table org-element org org-macro org-footnote
org-pcomplete org-list org-faces org-entities emacspeak-outline foldout
noutline outline easy-mmode org-version ob-emacs-lisp ob ob-tangle
ob-ref ob-lob ob-table ob-exp org-src ob-keys ob-comint ob-core ob-eval
org-compat org-macs org-loaddefs emacspeak-find-func find-func
emacspeak-view view xbacklight hydra lv emacspeak-elfeed elfeed-show shr
dom subr-x elfeed-db elfeed-lib avl-tree elfeed-search
emacspeak-bookmark bookmark pp elfeed url-queue xml-query
emacspeak-folding folding emacspeak-reftex reftex reftex-vars w3-prepare
w3 w3-menu w3-emulate w3-auto w3-parse w3-fast-parse emacspeak-w3
emacspeak-google html2text gmaps emacspeak-we w3-display w3-mouse
w3-imap url-handlers w3-widget w3-vars w3-keymap w3-cus css font
disp-table devices ange-ftp w3-cfg w3-compat emacspeak-sigbegone
sigbegone emacspeak-custom cus-edit cus-start emacspeak-mspools mspools
gnus-prepare gnus-demon nntp emacspeak-gnus gm-nnir nnir gnus-art mm-uu
mml2015 mm-view mml-smime smime dig gnus-sum gnus-group gnus-undo
gnus-start gnus-cloud nnimap nnmail mail-source tls utf7 netrc nnoo
parse-time gnus-spec gnus-int gnus-range emacspeak-message message
format-spec rfc822 mml mml-sec mm-decode mm-bodies mm-encode mail-parse
rfc2231 mailabbrev gmm-utils mailheader gnus-win emacspeak-hide gnus
gnus-ems nnheader gm-smtp smtpmail sendmail rfc2047 rfc2045 ietf-drums
mail-utils vm-autoloads vm-vars vm-version my-functions completion
dired-aux dired-x emacspeak-dired locate emacspeak-desktop desktop
frameset dired emacspeak-aumix emacspeak-forms forms forms-mode
emacspeak-setup emacspeak-dbus nm dbus xml emacspeak-webspace
emacspeak-feeds emacspeak-xslt gf gweb derived emacspeak-advice shell
pcomplete comint ring emacspeak-ansi-color ansi-color emacspeak-replace
emacspeak-redefine emacspeak-personality emacspeak emacspeak-widget
warnings emacspeak-webutils browse-url gfeeds url url-proxy url-privacy
url-expand url-methods url-history url-cookie url-domsuf url-util
url-parse auth-source gnus-util mm-util help-fns mail-prsvr
password-cache url-vars mailcap emacspeak-auctex emacspeak-package
emacspeak-calendar appt diary-lib diary-loaddefs g-utils json map seq
solar cal-dst cal-menu calendar cal-loaddefs emacspeak-kmacro
emacspeak-info emacspeak-facemenu emacspeak-buff-menu g-cus-load
cus-load emacspeak-fix-interactive emacspeak-preamble finder-inf
tex-site go-mode-autoloads ipython-autoloads eieio logito-autoloads
memory-usage-autoloads pydoc-info info-look ssh-autoloads cl-seq
wget-autoloads info eieio-core package epg-config emacspeak-keymap
edmacro kmacro wid-edit emacspeak-speak emacspeak-pronounce thingatpt
dtk-speak dtk-interp voice-setup emacspeak-sounds dectalk-voices
espeak-voices mac-voices outloud-voices dtk-unicode descr-text
dtk-css-speech acss-structure tts emacspeak-load-path byte-opt bytecomp
byte-compile cl-extra help-mode easymenu cconv advice cl-macs cl gv
cl-loaddefs pcase cl-lib time-date mule-util tooltip eldoc electric
uniquify ediff-hook vc-hooks lisp-float-type mwheel x-win
term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
tabulated-list newcomment elisp-mode lisp-mode prog-mode register page
menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core frame cl-generic cham georgian utf-8-lang
misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms
cp51932 hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese charscript case-table epa-hook jka-cmpr-hook help
simple abbrev minibuffer cl-preloaded nadvice loaddefs button faces
cus-face macroexp files text-properties overlay sha1 md5 base64 format
env code-pages mule custom widget hashtable-print-readable backquote
dbusbind inotify dynamic-setting system-font-setting font-render-setting
x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 1408241 68837)
 (symbols 48 83517 0)
 (miscs 40 804 764)
 (strings 32 247652 21676)
 (string-bytes 1 9304814)
 (vectors 16 94655)
 (vector-slots 8 1458734 32553)
 (floats 8 1835 1045)
 (intervals 56 4851 0)
 (buffers 976 41)
 (heap 1024 90299 3554))

-- 

Message #8 received at 22225 <at> debbugs.gnu.org (full text, mbox):

From: raman <raman <at> google.com>
To: help-debbugs <at> gnu.org (GNU bug Tracking System)
Cc: 22225 <at> debbugs.gnu.org
Subject: Re: bug#22225: Acknowledgement (25.0.50;
 stop-process appears to have no effect on Linux )
Date: Tue, 22 Dec 2015 14:03:52 -0800

help-debbugs <at> gnu.org (GNU bug Tracking System) writes:
Following up with additional info:

Note that signal-process does work in the same environment for the  same
example -- ie this code fragment behaves as expected.
(setq proc
      (let ((process-connection-type nil))
        (start-process "mplayer" nil "mplayer"
(expand-file-name "emacspeak.mp3" emacspeak-sounds-directory))))
(signal-process  proc 'sigstop) ;suspends it
(signal-process  proc 'sigcont) ;resumes it 

> Thank you for filing a new bug report with debbugs.gnu.org.
>
> This is an automatically generated reply to let you know your message
> has been received.
>
> Your message is being forwarded to the package maintainers and other
> interested parties for their attention; they will reply in due course.
>
> Your message has been sent to the package maintainer(s):
>  bug-gnu-emacs <at> gnu.org
>
> If you wish to submit further information on this problem, please
> send it to 22225 <at> debbugs.gnu.org.
>
> Please do not send mail to help-debbugs <at> gnu.org unless you wish
> to report a problem with the Bug-tracking system.

-- 

Message #11 received at 22225 <at> debbugs.gnu.org (full text, mbox):

From: Tom Tromey <tom <at> tromey.com>
To: raman <raman <at> google.com>
Cc: 22225 <at> debbugs.gnu.org
Subject: Re: bug#22225: Acknowledgement (25.0.50;
 stop-process appears to have no effect on Linux )
Date: Wed, 23 Dec 2015 08:17:03 -0700

>>>>> "raman" == raman  <raman <at> google.com> writes:

raman> help-debbugs <at> gnu.org (GNU bug Tracking System) writes:
raman> Following up with additional info:

raman> Note that signal-process does work in the same environment for the  same
raman> example -- ie this code fragment behaves as expected.
raman> (setq proc
raman>       (let ((process-connection-type nil))
raman>         (start-process "mplayer" nil "mplayer"
raman> (expand-file-name "emacspeak.mp3" emacspeak-sounds-directory))))
raman> (signal-process  proc 'sigstop) ;suspends it

FWIW, stop-process uses SIGTSTP, not SIGSTOP, so this isn't exactly
equivalent.

Does your snippet work if you use 'sigtstp instead?

Tom

Message #18 received at 22225-done <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: 22225-done <at> debbugs.gnu.org
Subject: Re: bug#22225: Acknowledgement (25.0.50;
 stop-process appears to have no effect on Linux )
Date: Wed, 07 Dec 2016 15:23:05 -0500

Tom Tromey wrote:

> FWIW, stop-process uses SIGTSTP, not SIGSTOP, so this isn't exactly
> equivalent.
>
> Does your snippet work if you use 'sigtstp instead?

No response in a year, closing.

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