Electron kill child_process.exec

Question

I have an electron app that uses child_process.exec to run long running tasks. I am struggling to manage when the user exits the app during those tasks.

I

Answer 1

So after everyones great comments I was able to update my code with a number of additions to get it to work, so am posting my updates for everyone else.

1) Change from child_process.exec to child_process.spawn

var loader = child_process.spawn('program', options, { detached: true })

2) Use the Electron ipcRenderer to communicate from my module to the main.js script. This allows me to send the PIDs to main.js

ipcRenderer.send('pid-message', loader.pid);

ipcMain.on('pid-message', function(event, arg) {
  console.log('Main:', arg);
  pids.push(arg);
});

3) Add those PIDs to array

4) In my main.js I added the following code to kill any PIDs that exist in the array before exiting the app.

// App close handler
app.on('before-quit', function() {
  pids.forEach(function(pid) {
    // A simple pid lookup
    ps.kill( pid, function( err ) {
        if (err) {
            throw new Error( err );
        }
        else {
            console.log( 'Process %s has been killed!', pid );
        }
    });
  });
});

Thanks for everyones help.