Function used to reap all child process...also known as...child reaper...

thereaping.go

func ChildReaper() (exits []Exit, err error) {
	//start the loop to reap any abandonded children.
	for {
		var (
			status syscall.WaitStatus
			usage  syscall.Rusage
		)

		// make the `wait4` call and check for errors. if the error equals
		// ECHILD (no child process), return empty exit status.
		processID, err := syscall.Wait4(-1, &status, syscall.WNOHANG, &usage)
		if err != nil {
			if err == syscall.ECHILD {
				return exits, nil
			}
		}

		// shows which processes have exited and with what status.
		exits = append(exits, Exit{
			processID, status.ExitStatus(),
		})
	}
}