Subject: Re: bug#21972: 24.5; Running 'bash -i -c' via shell-command hangs on FreeBSD

From: Stefan Kangas <[email-masked]>
Date: Mon, 14 Oct 2019 21:55:22 +0200

Davor Cubranic <[email-masked]> writes:

> On FreeBSD, running:
>
>   M-x shell-command
>   /usr/local/bin/bash -i -c "echo hello"

On GNU/Linux, the above gives me:

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

> hangs until you press C-g (twice). I can see the bash process running at
> 100% via `top` until C-g kills it.
>
> Adding `--norc --noprofile` to the command still hangs, so it's not
> anything about the shell initialization files. The `-i` option is the
> key: without it, everything works fine.
>
> Running the same command via `async-shell-command` does not hang: Bash
> outputs "hello" in the "*Async Shell Command*" buffer and exits.
>
> Both Emacs and Bash are standard FreeBSD 10 binary packages installed
> via `pkg`. (emacs24-24.5_1,3 and bash-4.3.42, respectively).

If bash hangs, shouldn't that be reported as a bug in bash instead?
Or should Emacs somehow do better with a hanging process?

Best regards,
Stefan Kangas