test: refactor test-dgram-multicast-set-interface-lo.js

Convert functions to arrow functions. Remove unused param('signal') from
function.
PR-URL: #30536
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

Author: Taylor Gagne

test/internet/test-dgram-multicast-set-interface-lo.js

@@ -83,8 +83,14 @@ if (process.argv[2] !== 'child') {
 leti=0;
 letdone=0;
 lettimer=null;
+
+constkillSubprocesses=(subprocesses)=>{
+for(constiinsubprocesses)
+subprocesses[i].kill();
+};
+
 // Exit the test if it doesn't succeed within the TIMEOUT.
-timer=setTimeout(function(){
+timer=setTimeout(()=>{
 console.error('[PARENT] Responses were not received within %d ms.',
 TIMEOUT);
 console.error('[PARENT] Skip');
@@ -115,7 +121,7 @@ if (process.argv[2] !== 'child') {
 worker.messagesNeeded=messagesNeeded;
 
 // Handle the death of workers.
-worker.on('exit',function(code,signal){
+worker.on('exit',(code)=>{
 // Don't consider this a true death if the worker has finished
 // successfully or if the exit code is 0.
 if(worker.isDone||code===0){
@@ -138,7 +144,7 @@ if (process.argv[2] !== 'child') {
 }
 });
 
-worker.on('message',function(msg){
+worker.on('message',(msg)=>{
 if(msg.listening){
 listening+=1;
 
@@ -162,12 +168,12 @@ if (process.argv[2] !== 'child') {
 'required number of '+
 'messages. Will now compare.');
 
-Object.keys(workers).forEach(function(pid){
+Object.keys(workers).forEach((pid)=>{
 constworker=workers[pid];
 
 letcount=0;
 
-worker.messagesReceived.forEach(function(buf){
+worker.messagesReceived.forEach((buf)=>{
 for(leti=0;i<worker.messagesNeeded.length;++i){
 if(buf.toString()===worker.messagesNeeded[i]){
 count++;
@@ -201,15 +207,15 @@ if (process.argv[2] !== 'child') {
 // Don't bind the address explicitly when sending and start with
 // the OSes default multicast interface selection.
 sendSocket.bind(common.PORT,ANY[FAM]);
-sendSocket.on('listening',function(){
+sendSocket.on('listening',()=>{
 console.error(`outgoing iface ${interfaceAddress}`);
 });
 
-sendSocket.on('close',function(){
+sendSocket.on('close',()=>{
 console.error('[PARENT] sendSocket closed');
 });
 
-sendSocket.sendNext=function(){
+sendSocket.sendNext=()=>{
 constmsg=messages[i++];
 
 if(!msg){
@@ -228,7 +234,7 @@ if (process.argv[2] !== 'child') {
 buf.length,
 PORTS[msg.mcast],
 msg.mcast,
-function(err){
+(err)=>{
 assert.ifError(err);
 console.error('[PARENT] sent %s to %s:%s',
 util.inspect(buf.toString()),
@@ -238,11 +244,6 @@ if (process.argv[2] !== 'child') {
 }
 );
 };
-
-functionkillSubprocesses(subprocesses){
-for(constiinsubprocesses)
-subprocesses[i].kill();
-}
 }
 
 if(process.argv[2]==='child'){
@@ -258,7 +259,7 @@ if (process.argv[2] === 'child') {
 reuseAddr: true
 });
 
-listenSocket.on('message',function(buf,rinfo){
+listenSocket.on('message',(buf,rinfo)=>{
 // Examine udp messages only when they were sent by the parent.
 if(!buf.toString().startsWith(SESSION))return;
 
@@ -280,7 +281,7 @@ if (process.argv[2] === 'child') {
 });
 
 
-listenSocket.on('listening',function(){
+listenSocket.on('listening',()=>{
 listenSocket.addMembership(MULTICAST,IFACE);
 process.send({listening: true});
 });