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: types.go
    path of file: ./repos/hubble-ui/backend/vendor/github.com/cilium/ebpf/internal/sys
    
    the code of the file until where you have to start completion: // Code generated by internal/cmd/gentypes; DO NOT EDIT.

package sys

import (
	"unsafe"
)

type AdjRoomMode uint32

const (
	BPF_ADJ_ROOM
    
func BtfGetFdById(attr *BtfGetFdByIdAttr) (*FD, error) {
	fd, err := BPF(BPF_BTF_GET_FD_BY_ID, unsafe.Pointer(attr), unsafe.Sizeof(*attr))
	if err != nil {
		return nil, err
	}
	return NewFD(int(fd))
}