GNU bug report logs - #63855
29.0.91; Exiting gdb's python interactive mode within gud-mode exits gdb as well

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

From: Jonas Bülow <jonas.bulow <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.0.91; Exiting gdb's python interactive mode within gud-mode exits
 gdb as well
Date: Fri, 2 Jun 2023 18:00:33 +0200

--text follows this line--

0. (start with emacs -Q)
1. M-x gdb <RET>
2. Run gdb (like this): gdb -i=mi <RET>
3. Enter python interactive mode with: pi <RET>
4. Try to exit gdb's python interactive mode with Ctrl-D

Expected: get back to gdb prompt

Actual: gdb exits with "Debugger finished"


Doing the same directly from a terminal gives the expected behavior.

---

In GNU Emacs 29.0.91 (build 2, x86_64-pc-linux-gnu, GTK+ Version
 3.24.33, cairo version 1.16.0) of 2023-05-24 built on i9
Repository revision: 212884f2bfed7f00e58aad183edd20ecc2a23e71
Repository branch: emacs-29
Windowing system distributor 'The X.Org Foundation', version 11.0.12101004
System Description: Ubuntu 22.04.2 LTS

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Message #8 received at 63855 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Jonas Bülow <jonas.bulow <at> gmail.com>
Cc: 63855 <at> debbugs.gnu.org
Subject: Re: bug#63855: 29.0.91;
 Exiting gdb's python interactive mode within gud-mode exits gdb as
 well
Date: Fri, 02 Jun 2023 21:21:10 +0300

> From: Jonas Bülow <jonas.bulow <at> gmail.com>
> Date: Fri, 2 Jun 2023 18:00:33 +0200
> 
> 0. (start with emacs -Q)
> 1. M-x gdb <RET>
> 2. Run gdb (like this): gdb -i=mi <RET>
> 3. Enter python interactive mode with: pi <RET>
> 4. Try to exit gdb's python interactive mode with Ctrl-D
> 
> Expected: get back to gdb prompt
> 
> Actual: gdb exits with "Debugger finished"

AFAIR, this is the best we can do in that situation.  You should exit
python interactive mode by other means, if you want to stay inside
GDB.  Sorry.

(Of course, if someone knows how to teach gdb-mi.el to distinguish
between the two possible interpretations of EOF, patches to do so will
be welcome.)

Message #11 received at 63855 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Jonas Bülow <jonas.bulow <at> gmail.com>
Cc: 63855 <at> debbugs.gnu.org
Subject: Re: bug#63855: 29.0.91; Exiting gdb's python interactive mode within
 gud-mode exits gdb as well
Date: Sat, 03 Jun 2023 13:36:41 +0300

> From: Jonas Bülow <jonas.bulow <at> gmail.com>
> Date: Sat, 3 Jun 2023 12:10:04 +0200
> Cc: 63855 <at> debbugs.gnu.org
> 
> Unfortunately, there doesn't seem to be any other way to exit python
> interactive mode. Using exit() or quit() from python interactive mode
> exits gdb even from the terminal.

Then I guess we need someone smart to tell how to send Ctrl-D to GDB
so that it doesn't exit in this case.

Message #14 received at 63855 <at> debbugs.gnu.org (full text, mbox):

From: Jonas Bülow <jonas.bulow <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 63855 <at> debbugs.gnu.org
Subject: Re: bug#63855: 29.0.91; Exiting gdb's python interactive mode within
 gud-mode exits gdb as well
Date: Sat, 3 Jun 2023 12:10:04 +0200

Unfortunately, there doesn't seem to be any other way to exit python
interactive mode. Using exit() or quit() from python interactive mode
exits gdb even from the terminal.

On Fri, Jun 2, 2023 at 8:20 PM Eli Zaretskii <eliz <at> gnu.org> wrote:
>
> > From: Jonas Bülow <jonas.bulow <at> gmail.com>
> > Date: Fri, 2 Jun 2023 18:00:33 +0200
> >
> > 0. (start with emacs -Q)
> > 1. M-x gdb <RET>
> > 2. Run gdb (like this): gdb -i=mi <RET>
> > 3. Enter python interactive mode with: pi <RET>
> > 4. Try to exit gdb's python interactive mode with Ctrl-D
> >
> > Expected: get back to gdb prompt
> >
> > Actual: gdb exits with "Debugger finished"
>
> AFAIR, this is the best we can do in that situation.  You should exit
> python interactive mode by other means, if you want to stay inside
> GDB.  Sorry.
>
> (Of course, if someone knows how to teach gdb-mi.el to distinguish
> between the two possible interpretations of EOF, patches to do so will
> be welcome.)

Message #17 received at 63855 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: jonas.bulow <at> gmail.com
Cc: 63855 <at> debbugs.gnu.org
Subject: Re: bug#63855: 29.0.91;
 Exiting gdb's python interactive mode within gud-mode exits gdb as
 well
Date: Sat, 03 Jun 2023 14:11:41 +0300

> Cc: 63855 <at> debbugs.gnu.org
> Date: Sat, 03 Jun 2023 13:36:41 +0300
> From: Eli Zaretskii <eliz <at> gnu.org>
> 
> > From: Jonas Bülow <jonas.bulow <at> gmail.com>
> > Date: Sat, 3 Jun 2023 12:10:04 +0200
> > Cc: 63855 <at> debbugs.gnu.org
> > 
> > Unfortunately, there doesn't seem to be any other way to exit python
> > interactive mode. Using exit() or quit() from python interactive mode
> > exits gdb even from the terminal.
> 
> Then I guess we need someone smart to tell how to send Ctrl-D to GDB
> so that it doesn't exit in this case.

Btw, I see a similar behavior from the console, if I start GDB with
the -i=mi option, like Emacs does: when you type Ctrl-D after invoking
"pi", you can no longer interact with GDB: any input you type exits
GDB and gets interpreted by the shell instead.

So maybe this is a GDB bug that needs to be reported to the GDB
developers?

Message #20 received at 63855 <at> debbugs.gnu.org (full text, mbox):

From: Jonas Bülow <jonas.bulow <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 63855 <at> debbugs.gnu.org
Subject: Re: bug#63855: 29.0.91; Exiting gdb's python interactive mode within
 gud-mode exits gdb as well
Date: Sat, 3 Jun 2023 13:22:44 +0200

This gdb bug looks relevant:
https://sourceware.org/bugzilla/show_bug.cgi?id=25388

On Sat, Jun 3, 2023 at 1:10 PM Eli Zaretskii <eliz <at> gnu.org> wrote:
>
> > Cc: 63855 <at> debbugs.gnu.org
> > Date: Sat, 03 Jun 2023 13:36:41 +0300
> > From: Eli Zaretskii <eliz <at> gnu.org>
> >
> > > From: Jonas Bülow <jonas.bulow <at> gmail.com>
> > > Date: Sat, 3 Jun 2023 12:10:04 +0200
> > > Cc: 63855 <at> debbugs.gnu.org
> > >
> > > Unfortunately, there doesn't seem to be any other way to exit python
> > > interactive mode. Using exit() or quit() from python interactive mode
> > > exits gdb even from the terminal.
> >
> > Then I guess we need someone smart to tell how to send Ctrl-D to GDB
> > so that it doesn't exit in this case.
>
> Btw, I see a similar behavior from the console, if I start GDB with
> the -i=mi option, like Emacs does: when you type Ctrl-D after invoking
> "pi", you can no longer interact with GDB: any input you type exits
> GDB and gets interpreted by the shell instead.
>
> So maybe this is a GDB bug that needs to be reported to the GDB
> developers?

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