After reinstalling Cygwin, executing shell function in Emacs gets "cannot set terminal process group"

After reinstalling Cygwin, executing shell function in Emacs gets "cannot set terminal process group"

[KARR, DAVID]

I've been using Cygwin and Cygwin Emacs for a long time on Windows 11.  I have to reinstall it every couple of years.  I just reinstalled Cygwin today, and after having to remember a bunch of things, I finally got my Emacs window again.  However, the main thing I use it for is giving me a new problem.  I have a wrapper function that creates a new buffer and runs "(shell)".  This has literally worked fine for decades.  Today, it worked fine for the first shell.  The package allows me to manage multiple shell buffers. When I tried to create the second shell buffer, it said this:

    bash: cannot set terminal process group (-1): Inappropriate ioctl for device
    bash: no job control in this shell

If I just kill this buffer at this point, I can safely interact with the first shell buffer.  However, if I execute any command, it seems to execute it in an infinite loop, and if I then kill the buffer, the Emacs process is completely hung, and I have to kill the entire process. 

This is using Emacs v29.4.

Re: After reinstalling Cygwin, executing shell function in Emacs gets "cannot set terminal process group"

[Eli Zaretskii]

> From: "KARR, DAVID" <dk068x@att.com>
> Date: Thu, 8 Aug 2024 23:55:59 +0000
> 
> I've been using Cygwin and Cygwin Emacs for a long time on Windows 11.  I have to reinstall it every couple of years.  I just reinstalled Cygwin today, and after having to remember a bunch of things, I finally got my Emacs window again.  However, the main thing I use it for is giving me a new problem.  I have a wrapper function that creates a new buffer and runs "(shell)".  This has literally worked fine for decades.  Today, it worked fine for the first shell.  The package allows me to manage multiple shell buffers. When I tried to create the second shell buffer, it said this:
> 
>     bash: cannot set terminal process group (-1): Inappropriate ioctl for device
>     bash: no job control in this shell
> 
> If I just kill this buffer at this point, I can safely interact with the first shell buffer.  However, if I execute any command, it seems to execute it in an infinite loop, and if I then kill the buffer, the Emacs process is completely hung, and I have to kill the entire process. 
> 
> This is using Emacs v29.4.

Sounds to me like something that you should first report to the Cygwin
mailing list.  Crystal ball says that the new version of Cygwin which
you installed does something differently wrt IOCTL on console devices.

RE: After reinstalling Cygwin, executing shell function in Emacs gets "cannot set terminal process group"

[KARR, DAVID]

I’ve managed to resolve this.  I’m not certain exactly what was wrong, but I found something that’s been in my shell-mode-hook that has literally been there for decades, which when commented out, doesn’t show the symptom anymore.

After examining eshell for a couple of days, I conclude that it’s an interesting package, but I hope I don’t have to use it. It would require too many changes to my existing processes.

From: help-gnu-emacs-bounces+dk068x=att.com@gnu.org <help-gnu-emacs-bounces+dk068x=att.com@gnu.org> On Behalf Of Eli Zaretskii
Sent: Friday, August 9, 2024 3:26 AM
To: Help-gnu-emacs@gnu.org
Subject: Re: After reinstalling Cygwin, executing shell function in Emacs gets "cannot set terminal process group"

> From: "KARR, DAVID" <dk068x@ att. com> > Date: Thu, 8 Aug 2024 23: 55: 59 +0000 > > I've been using Cygwin and Cygwin Emacs for a long time on Windows 11. I have to reinstall it every couple of years. I just reinstalled Cygwin


> From: "KARR, DAVID" <dk068x@att.com<mailto:dk068x@att.com>>

> Date: Thu, 8 Aug 2024 23:55:59 +0000

>

> I've been using Cygwin and Cygwin Emacs for a long time on Windows 11.  I have to reinstall it every couple of years.  I just reinstalled Cygwin today, and after having to remember a bunch of things, I finally got my Emacs window again.  However, the main thing I use it for is giving me a new problem.  I have a wrapper function that creates a new buffer and runs "(shell)".  This has literally worked fine for decades.  Today, it worked fine for the first shell.  The package allows me to manage multiple shell buffers. When I tried to create the second shell buffer, it said this:

>

>     bash: cannot set terminal process group (-1): Inappropriate ioctl for device

>     bash: no job control in this shell

>

> If I just kill this buffer at this point, I can safely interact with the first shell buffer.  However, if I execute any command, it seems to execute it in an infinite loop, and if I then kill the buffer, the Emacs process is completely hung, and I have to kill the entire process.

>

> This is using Emacs v29.4.



Sounds to me like something that you should first report to the Cygwin

mailing list.  Crystal ball says that the new version of Cygwin which

you installed does something differently wrt IOCTL on console devices.