Node.js socket.unref() Method
The socket.unref() method is an inbuilt application programming interface of class Socket within dgram module which is used to allow the process to exit even if the socket is still listening.
Syntax:
const socket.unref()
Parameters: This method does not accept any parameters.
Return Value: This method returnsthe reference of the particular socket containing all the information in it.
Example 1: Filename: index.js
// Node.js program to demonstrate the // server.unref() property // Importing dgram module var dgram = require( 'dgram' ); // Creating and initializing client // and server socket var client = dgram.createSocket( "udp4" ); var server = dgram.createSocket( "udp4" ); // Handling the message event server.on( "message" , function (msg) { // Displaying the client message process.stdout.write( "UDP String: " + msg + "\n" ); // Exiting process process.exit(); }) // Binding server with port .bind(1234, () => { // Getting the reference of the server // by using unref() method const size = server.unref(); // Display the result console.log(size.eventNames()); }); // Client sending message to server client.send( "Hello" , 0, 7, 1234, "localhost" ); |
Output:
[ 'message' ] UDP String: Hello
Example 2: Filename: index.js
// Node.js program to demonstrate the // server.unref() method // Importing dgram module var dgram = require( 'dgram' ); // Creating and initializing client // and server socket var client = dgram.createSocket( "udp4" ); var server = dgram.createSocket( "udp4" ); // Handling the message event server.on( "message" , function (msg) { // Displaying the client message process.stdout.write( "UDP String: " + msg + "\n" ); // Exiting process process.exit(); }); // Handling the listening event server.on( 'listening' , () => { // Getting address information // for the server const address = server.address(); // Display the result console.log(`server listening ${address.address}:${address.port}`); }); // Binding server with port address // by using bind() method server.bind(1234, () => { // Getting the reference of server // by using unref() methods const size = server.unref(); // Display the result console.log(size.eventNames()); }); // Client sending message to server client.send( "Hello" , 0, 7, 1234, "localhost" ); |
Run the index.js file using the following command:
node index.js
Output:
server listening 0.0.0.0:1234 [ 'message', 'listening' ] UDP String: Hello
Reference: https://nodejs.org/dist/latest-v12.x/docs/api/dgram.html#dgram_socket_unref