Node.js process.kill() Method

The process.kill( pid[,signal] ) is an inbuilt method of node.js which sends a signal to the process, pid (which is the process id) and signal is in the string format that is the signal to send.

Syntax :

process.kill(pid[, signal])

• pid: This parameter holds the process ID.
• signal: This parameter holds the string format.

  signal names : These are in string format .

  1. SIGTERM
  2. SIGINT
  3. SIGHUP

Note : If no signal specified, then by default 'SIGTERM' will be the signal.

• 'SIGTERM' and 'SIGINT' signals have default handlers on non-Windows platforms that reset the terminal mode before exiting with code 128 + signal number. If one of these signals has a listener installed, its default behavior on node.js will be removed.
• 'SIGHUP' is generated when the console window is closed.

Return value : The process.kill() method will throw an error if the target pid is not found or doesn't exist. This method returns boolean value 0 if pid exists and can be used as a test for the existence of the target process. For window users, this method will also throw an error if pid is used to kill a group of process. 

Below examples illustrate the use of process.kill() property in Node.js:

Example 1:

// Node.js program to demonstrate the 
// process.kill(pid[, signal]) method 


// Printing process signal acknowledged
const displayInfo = () => {
  console.log('Receiving SIGINT signal in nodeJS.');
}

// Initiating a process
process.on('SIGINT', displayInfo);

setTimeout(() => {
  console.log('Exiting.');
  process.exit(0);
}, 100);

// kill the process with pid and signal = 'SIGINT'     
process.kill(process.pid, 'SIGINT');

Command to run :

node index.js

Output :

Example 2 :

// Node.js program to demonstrate the 
// process.kill(pid[, signal]) method 
// Printing process signal acknowledged
const displayInfo = () => {
  console.log('Acknowledged SIGHUP signal in nodeJS.');
}

// Initiating a process
process.on('SIGHUP', displayInfo);

setTimeout(() => {
  console.log('Exiting.');
  process.exit(0);
}, 100);

// kill the process with pid and signal = 'SIGHUP'     
process.kill(process.pid, 'SIGHUP');

Command to run :

node index.js

Output :

Reference : https://nodejs.org/api/process.html#process_process_kill_pid_signal

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Article Tags :

• JavaScript
• Web Technologies
• Node.js
• Node.js-Methods
• NodeJS-Process

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