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: nl_linux.go
    path of file: ./repos/kubernetes/vendor/github.com/vishvananda/netlink/nl
    
    the code of the file until where you have to start completion: // Package nl has low level primitives for making Netlink calls.
package nl

import (
	"bytes"
	"encoding/binary"
	"fmt"
	"net"
	"runtime"
	"sync"
	"sync/atomic"
	"syscall"
	"un
    
func SubscribeAt(newNs, curNs netns.NsHandle, protocol int, groups ...uint) (*NetlinkSocket, error) {
	c, err := executeInNetns(newNs, curNs)
	if err != nil {
		return nil, err
	}
	defer c()
	return Subscribe(protocol, groups...)
}