Lars Ingebrigtsen <larsi@HIDDEN>
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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Samuel =?utf-8?Q?Mu=C3=B1oz?= Hidalgo <samuel.mh@HIDDEN>
Subject: Re: bug#51788: cua + ansi-term hangs
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("Samuel =?utf-8?Q?Mu=C3=B1oz?= Hidalgo"'s message of "Fri, 12 Nov 2021
12:22:18 +0100")
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Content preview: Samuel Muñoz Hidalgo <samuel.mh@HIDDEN> writes: > 1- Select
a text in a buffer and use the keybind F2 instead of calling the function
> manually. It opens a terminal with the selected word pasted in it. > 3-
Type C-c or (C-x) and emacs freezes with [...]
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Samuel Mu=C3=B1oz Hidalgo <samuel.mh@HIDDEN> writes:
> 1- Select a text in a buffer and use the keybind F2 instead of calling th=
e function
> manually. It opens a terminal with the selected word pasted in it.
> 3- Type C-c or (C-x) and emacs freezes with a 100% CPU usage in a single =
core.
(I'm going through old bug reports that unfortunately weren't resolved
at the time.)
I can reproduce this in Emacs 29. Setting debug-on-quit and hitting
`C-g' give me the following backtrace:
Debugger entered--Lisp error: (quit)
timer--activate([t 25385 48685 328606 nil cua--prefix-override-timeout ni=
l nil 450000 nil] nil nil nil)
timer-activate([t 25385 48685 328606 nil cua--prefix-override-timeout nil=
nil 450000 nil])
run-at-time(0.2 nil cua--prefix-override-timeout)
apply(run-at-time 0.2 nil cua--prefix-override-timeout nil)
run-with-timer(0.2 nil cua--prefix-override-timeout)
cua--prefix-override-replay(0)
cua-copy-handler()
funcall-interactively(cua-copy-handler)
call-interactively(cua-copy-handler nil nil)
I'm wholly unfamiliar with cua-mode, though. Does anybody else know
what could be happening here?
bug-gnu-emacs@HIDDEN:bug#51788; Package emacs.
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The utility has to do with sending the selected text to a term buffer and when in the term buffer if C-c (or C-x) is pressed, it hangs. I 've traced the behavior and my guess it that is has to do with cua-mode. EMACS VERSION: I've been able to replicate the behaviour in : - GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.20, cairo version 1.16.0) - GNU Emacs 26.3 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.24.14) of 2020-03-26, modified by Debian CONTEXT: 1- Open an empty emacs instance: ``` /usr/bin/emacs -q ``` 2- Paste this code in a buffer (*scratch*) ``` (cua-mode t) (defun terminal-send-selection() (interactive) (call-interactively #'kill-ring-save) (ansi-term "/usr/bin/bash" "test") (term-paste) ) (global-set-key [f2] 'terminal-send-selection) ``` 3- Eval the buffer with the code `eval-buffer` CASE 1 (OK): 1- Select a text in a buffer and 'M-x' `terminal-send-selection`. It opens a terminal with the selected text pasted in it. 3- Type C-c, then prefix key is activated. 4- Type C-c again and works as expected, the pasted text is executed in bash. CASE 2 (PROBLEM): 1- Select a text in a buffer and use the keybind F2 instead of calling the function manually. It opens a terminal with the selected word pasted in it. 3- Type C-c or (C-x) and emacs freezes with a 100% CPU usage in a single core. 4- Then on a external shell: ``` kill -USR2 `pidof emacs` ``` And I get in the minibuffer. ``` Error in pre-command-hook (term-set-goto-process-mark): (quit) ``` Emacs is still hanged. 5- Repeat the command in the external shell. ``` kill -USR2 `pidof emacs` ``` And I get in *Backtrace* ``` Debugger entered--Lisp error: (quit) ``` The editor is not hanged anymore. But the behaviour is undesired. CASE 3 (OK): 1- Don't activate cua-mode. Redo al the process but without copying the line`(cua-mode t)`. 2- Then case 2 work as expected. OTHER APPROACHES: Instead of using the function "term-paste" I have also tried with. 1 - Using the function "comint-send-string". 2 - Pasting directly the test in the ansi-term buffer. With the same results. Why does the CASE 2 happens? As the code is so simple I think this has to be a bug. Any help or insights are welcome. --000000000000a83ebf05d095acb8 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr">Hello,<br><br>I've tried to implement a small utility = function in elisp and I end up with emacs hanged whenever certain condition= s are met.<br><br>The utility has to do with sending the selected text to a= term buffer and when in the term buffer if C-c=C2=A0 (or C-x) is pressed, = it hangs.<br><br>I 've traced the behavior and my guess it that is has = to do with cua-mode.<br><br><br>EMACS VERSION:<br>I've been able to rep= licate the behaviour in :<br>- GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu= , GTK+ Version 3.24.20, cairo version 1.16.0)<br>- GNU Emacs 26.3 (build 2,= x86_64-pc-linux-gnu, GTK+ Version 3.24.14) of 2020-03-26, modified by Debi= an<br><br><br>CONTEXT:<br><br>1- Open an empty emacs instance:<br>```<br>/u= sr/bin/emacs -q<br>```<br><br>2- Paste this code in a buffer (*scratch*)<br= >```<br>(cua-mode t)<br><br>(defun terminal-send-selection()<br>=C2=A0 (int= eractive)<br>=C2=A0 (call-interactively #'kill-ring-save)<br>=C2=A0 (an= si-term "/usr/bin/bash" "test")<br>=C2=A0 (term-paste)<= br>=C2=A0 )<br><br>(global-set-key [f2] 'terminal-send-selection)<br>``= `<br><br>3- Eval the buffer with the code `eval-buffer`<br><br><br>CASE 1 (= OK):<br>1- Select a text in a buffer and 'M-x' `terminal-send-selec= tion`. It opens a terminal with the selected text pasted in it.<br>3- Type = C-c, then prefix key is activated.<br>4- Type C-c again and works as expect= ed, the pasted text is executed in bash.<br><br>CASE 2 (PROBLEM):<br>1- Sel= ect a text in a buffer and use the keybind F2 instead of calling the functi= on manually. It opens a terminal with the selected word pasted in it.<br>3-= Type C-c or (C-x) and emacs freezes with a 100% CPU usage in a single core= .<br>4- Then on a external shell:<br>```<br>kill -USR2 `pidof emacs`<br>```= <br>And I get in the minibuffer.<br>```<br>Error in pre-command-hook (term-= set-goto-process-mark): (quit)<br>```<br>Emacs is still hanged.<br>5- Repea= t the command in the external shell.<br>```<br>kill -USR2 `pidof emacs`<br>= ```<br>And I get in *Backtrace*<br>```<br>Debugger entered--Lisp error: (qu= it)<br>```<br>The editor is not hanged anymore. But the behaviour is undesi= red.<br><br><br>CASE 3 (OK):<br>1- Don't activate cua-mode. Redo al the= process but without copying the line`(cua-mode t)`. <br>2- Then case 2 wor= k as expected.<br><br><br>OTHER APPROACHES:<br>Instead of using the functio= n "term-paste" I have also tried with.<br><br>1 - Using the funct= ion "comint-send-string".<br>2 - Pasting directly the test in the= ansi-term buffer.<br><br>With the same results.<br><br><br>Why does the CA= SE 2 happens? <br>As the code is so simple I think this has to be a bug. An= y help or insights are welcome.<br></div> --000000000000a83ebf05d095acb8--
Samuel Muñoz Hidalgo <samuel.mh@HIDDEN>:bug-gnu-emacs@HIDDEN.
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