Python子进程中的Shell脚本.Popen不会终止子级

Question

I have an issue with interrupting the subprocess.Popen This is the setup:

I have a Tkinter gui and it is running a another python script using the Popen . This inner script (let's call it running script ) is running a shell shell script that is executing a piece of C++ code using a Popen so the hierarchical structure is looking like this:

GUI
\running_script
 \shell-script
  \c++

running_script works so that if it receives an interrupt, it sends SIGINT to shell-script . If i run a shell_script with my piece of C++ code with the running_script alone and do a CRTL+C everything works like a charm. However if i do it with GUI running the running_script as Popen, SIGINT is sent to the running_script is receives it properly and sends the interrupt signal to shell-script , but instead of terminating the inner process(being c++ code), the shell-script terminates itself and the C++ process continues running, as it was ran in the background, but it was not. When I execute ps -xaf the tree looks like this:

GUI
\running_script
 \shell-script <defunct>
c++

So to reiterate, when i run it without the GUI it works like a charm, but with GUI it behaves as explained above. I've tried sending shell-command a SIGTERM instead of SIGINT as well, the result is the same.

Answer 1

You could catch SIGINT in the shell script and make it send SIGINT to the c++ program, eg:

#!/bin/bash
./cpp_program &
procpid=$!
function killit() {
    kill -SIGINT $procpid
}
trap killit SIGINT
......