nicekill.js

var cp = require('child_process');

function *doKill(process, initial_delay)
{
        yield process.kill('SIGTERM');
        yield process.kill('SIGKILL');
}

function niceKill(process, onExit, initial_delay)
{
        var k = doKill(process);
        process.on('exit', () => {
                this.cancel();
                onExit && onExit(process);
        });
        if(!initial_delay)
                k.next();
        this.kInt = setInterval(() => k.next(), 5000);
}

niceKill.prototype.cancel = function()
{
        clearInterval(this.kInt);
}

var command = '/bin/sleep';
var arguments = ['3600'];
var n = cp.spawn(command, arguments, {
        stdio: [
                'ignore', // use parents stdin for child
                'ignore', // pipe child's stdout to parent
                'pipe' // direct child's stderr to a file
        ]
});

var a = new niceKill(n, (n) => console.log(n.killed), true);