Popen.send_signal(sigint.SIGKILL) does not seem to work with Popen(*, shell=True)? about cpython HOT 3 OPEN

With shell=True, the script signals the shell (e.g. bash), which will ignore SIGINT. In this case, SIGABRT kills the shell and leaves the sleep 1d command running. To send SIGINT to the child of the shell as well, execute the shell as the group leader of a new process group by passing the Popen argument process_group=0, and signal the group via os.killpg(process.pid, signal.SIGINT).

from cpython.

Thanks! Yup, that worked.
I had to slightly change your suggestion, using https://stackoverflow.com/a/22582659/7829525 + looking at this code:
https://github.com/python/cpython/blob/v3.10.12/Modules/_posixsubprocess.c#L554-L555

Using Popen(*, start_new_session=True) and os.killpg(os.getpgid(process.pid), signal.SIGINT) seems to fix it.
Patch applied to code similar to above:
EricCousineau-TRI/repro@f2aca66

from cpython.

The process_group option was added in 3.11. Using a new process group is my preferred way to solve this for a non-interactive process. Creating a new session works as well. Note that with a new session, the child process won't have a controlling terminal (e.g. opening "/dev/tty" will fail), but that shouldn't matter for a non-interactive command.

from cpython.