child.js

/**
 * Experiments with Process and Children
 * Child process
 * This is a really simple script that simulates a child process
 *  it runs through a loop, then exits after a certain number of 
 *  completed loops
 **/
var LOOP_SLEEP_TIME = 2000;
var NUMBER_OF_LOOPS = 1000;


console.log("Starting child");

// detect and report if this child exited
process.on("exit", function() {
   console.log("Child exiting");
});
// detect and report if this child was killed
process.on("SIGTERM", function() {
   console.log("Child SIGTERM detected");
   process.exit();
});

var child_loop = function() {
   // report the current loop
   console.log("Child loop: "+NUMBER_OF_LOOPS);

   // to simulate the child exiting itself without just running
   // out of program, if we have completed the desired number of
   // loops, exit this process 
   if( NUMBER_OF_LOOPS < 0 ) {
      console.log("Child finished loop");
      process.exit();
   }

   // sleep for a bit, then continue through the loops
   setTimeout(function() { child_loop() }, LOOP_SLEEP_TIME);
   NUMBER_OF_LOOPS--;
}


// start the loop
child_loop();