new_event_loop.rs

let (script_chan, script_port) = ipc::channel().expect("Pipeline script chan");

let mut unprivileged_pipeline_content = UnprivilegedPipelineContent {
    script_port,
    // bunch of other stuff needed to start the event-loop...
};

// Spawn the child process.
//
// Yes, that's all there is to it!
if opts::multiprocess() {
    let _ = unprivileged_pipeline_content.spawn_multiprocess()?;
} else {
    unprivileged_pipeline_content.start_all();
}

// Return an EventLoop to the constellation.
EventLoop::new(script_chan)