How to kill childprocess in nodejs?

Question

Created a childprocess using shelljs

!/usr/bin/env node

require('/usr/local/lib/node_modules/shelljs/global');
   fs = require("fs");  
   var child=exec("sudo mongod &",{async:true,silent:true});

   function on_exit(){
        console.log('Process Exit');
        child.kill("SIGINT");
        process.exit(0)
    }

    process.on('SIGINT',on_exit);
    process.on('exit',on_exit);

Child process is still running.. after kill the parent process

Answer 1

If you can use node's built in child_process.spawn , you're able to send a SIGINT signal to the child process:

var proc = require('child_process').spawn('mongod');
proc.kill('SIGINT');

An upside to this is that the main process should hang around until all of the child processes have terminated.

Answer 2

// only windows

const module_child_process = require('child_process');
let proc = module_child_process.spawn("cmd"); 
let pid = proc.pid;
let cmd = `wmic process where parentprocessid=${pid} get ProcessId`;
let out = module_child_process.execSync(cmd);
let stdout = out.toString();
let pids=[];
let lines = stdout.split("\n");
for (let i = 0; i < lines.length; i++) 
{
    try 
    {
        let data = lines[i].toString();
        let val = parseInt(data.trim());
        if (!isNaN(val))
        {
            //console.log(val.toString());
            pids.push(val);
        }
    }
    catch (ex)
    {
    }
}

for (let i = 0; i < pids.length; i++) 
{
    module_process.kill(pids[i]);
    /* or    
    let cmd = `taskkill /pid ${pids[i].toString()} /T /F`;
    console.log(cmd);
    module_child_process.execSync(cmd);
    */
}

proc.kill();
proc = null;