Kill the Child Process when Parent Process exists in NodeJS

Kill the Child Process when Parent Process exists in NodeJS

• There may be some cases where we may want to exit the child process, if the parent process quits gracefully.
• SIGINT / SIGKILL cannot be detected by NodeJS or even from the Linux - C API.
• These two signals are at the kernel space, hence cannot be detected from the User Space.
• But these two signals can be sent to the Child process by the Parent Process.
• SIGTERM ( graceful Shutdown ) can be detected by NodeJS. The following sample code explain how to capture graceful shutdown and kill the child process.

child.js

var sleep=require("sleep");
 
while(1){
console.log(" I m child process");
sleep.sleep(1);
}

Parent.js

const  spawnObj = require('child_process');
const child = spawnObj.fork('/home/user1/test/child.js');


process.on('SIGTERM', function () {
  console.log('Got SIGTERM.  Press Control-D to exit.');
   child.kill('SIGINT');
});



Run the Parent.js code and press CTRL + D.
When  CTRL+ D is pressed, child process is killed when the parent process exits.