You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: controller.go
    path of file: ./repos/tracee/pkg/ebpf/controlplane
    
    the code of the file until where you have to start completion: package controlplane

import (
	"context"
	"fmt"
	"time"

	"github.com/aquasecurity/libbpfgo"

	"github.com/aquasecurity/tracee/pkg/containers"
	"github.com/aquasecurity/tracee/pkg/events"
	"github.com/aquasecurity/tracee/pkg/logger"
	"github.com/aquasecurity/tracee/pkg/proctree"
)

// TODO: With the introduction of signal events, the control plane can now have a generic argument
// parsing, just like the regular pipeline. So all arguments ca
    
func (ctrl *Controller) processSignal(signal signal) error {
	switch signal.id {
	case events.SignalCgroupMkdir:
		return ctrl.processCgroupMkdir(signal.args)
	case events.SignalCgroupRmdir:
		return ctrl.processCgroupRmdir(signal.args)
	case events.SignalSchedProcessFork:
		return ctrl.procTreeForkProcessor(signal.args)
	case events.SignalSchedProcessExec:
		return ctrl.procTreeExecProcessor(signal.args)
	case events.SignalSchedProcessExit:
		return ctrl.procTreeExitProcessor(signal.args)
	}

	return nil
}