linux - Shell Script get CTRL+Z with Trap

Question

I am trying to get the SIGSTOP CTRL+Z signal in my script's trap.

When my script is executing, if I temporarily suspend from execution, send a SIGSTOP signalCTRL+Z, it needs to remove the files I create in it and to kill the execution.

I don't understand why the following script doesn't work. But, more important, what is the correct way to do it?

#!/bin/bash

DIR="temp_folder"
trap "rm -r $DIR; kill -SIGINT $$" SIGSTP

if [ -d $DIR ]
then
    rm -r $DIR
else
    mkdir $DIR
fi
sleep 5

EDIT:

SIGSTOP cannot be trapped, however SIGTSTP can be trapped, and from what I understood after searching on the internet and the answer below it's the correct to trap when sending signal with CTRL+Z. However, when I press CTRL+Z while running the script it will get stuck, meaning that the script will be endlessly execute no matter what signals I send afterwards.

Answer 1

There are two signals you can't trap*, SIGKILL and SIGSTOP. Use another signal.

^{*: without modifying the kernel}

IEEE standard:

Setting a trap for SIGKILL or SIGSTOP produces undefined results.