child process multiple file descriptors

Not sure why I never put these together, but a recent post on a GitHub issue from Ben demonstrated how simple it is to use file descriptors to pipe data between parent/child processes:

// null means to use the default setting (pipe) for that fd
var options = { stdio: [null, null, null, 'pipe'] };
var args = [ /* ... */ ];
var proc = child_process.spawn(cmd, args, options);
var pipe = proc.stdio[3];
pipe.write(Buffer('awesome'));


// now setup your child process like so
var pipe = new net.Socket({ fd: 3 });
pipe.on('data', function(buf) {
 // do whatever
});

Great. Now we can pipe data back and forth without possibly colliding with output of standard I/O.