linux

Use a process group so as to enable sending a signal to all the process in the groups. For that, you should attach a session id to the parent process of the spawned/child processes, which is a shell in your case. This will make it the group leader of the processes. So now, when a signal is sent to the process group leader, it's transmitted to all of the child processes of this group.

Here's the code:

import osimport signalimport subprocess# The os.setsid() is passed in the argument preexec_fn so# it's run after the fork() and before  exec() to run the shell.pro = subprocess.Popen(cmd, stdout=subprocess.PIPE,                        shell=True, preexec_fn=os.setsid) os.killpg(pro.pid, signal.SIGTERM)  # Send the signal to all the process groups