type handler interface {
	newRequest(cmd int, flags uint16) request
}

// request is an injectable interface representing a netlink request.
type request interface {
	Serialize() []byte
	AddData(data nl.NetlinkRequestData)
	AddRawData(data []byte)
	Execute(sockType int, resType uint16) ([][]byte, error)
}

// netlinkHandler is an implementation of the handler interface. It maintains a netlink socket

	if name == "" {
		return ErrEmptyName
	}
	if len(name) > MaxLength {
		return ErrNameExceedsMaxLength
	}

	req := r.handler.newRequest(cmdNew, unix.NLM_F_REQUEST|unix.NLM_F_CREATE|unix.NLM_F_ACK)
	req.AddData(nl.NewRtAttr(attrName, nl.ZeroTerminated(name)))
	_, err := req.Execute(unix.NETLINK_NETFILTER, 0)
	if err != nil {
		return handleError(err)
	}
	return nil
}

// Get is part of the interface.

import (
	"internal/coverage/rtcov"
	"unsafe"
)

// The compiler emits calls to runtime.addCovMeta
// but this code has moved to rtcov.AddMeta.
func addCovMeta(p unsafe.Pointer, dlen uint32, hash [16]byte, pkgpath string, pkgid int, cmode uint8, cgran uint8) uint32 {
	id := rtcov.AddMeta(p, dlen, hash, pkgpath, pkgid, cmode, cgran)
	if id == 0 {
		throw("runtime.addCovMeta: coverage package map collision")
	}
	return id

	// PkgMap records mappings from hard-coded package IDs to
	// slots in the List above.
	PkgMap map[int]int

	// Set to true if we discover a package mapping glitch.
	hardCodedListNeedsUpdating bool
}

// AddMeta is invoked during package "init" functions by the
// compiler when compiling for coverage instrumentation; here 'p' is a
// meta-data blob of length 'dlen' for the package in question, 'hash'

// for location l.
func getAbbrs(l *time.Location) (st, dt string) {
	t := time.Date(time.Now().Year(), 0, 1, 0, 0, 0, 0, l)
	abbr1, off1 := t.Zone()
	for i := 0; i < 12; i++ {
		t = t.AddDate(0, 1, 0)
		abbr2, off2 := t.Zone()
		if abbr1 != abbr2 {
			if off2-off1 < 0 { // southern hemisphere
				abbr1, abbr2 = abbr2, abbr1
			}
			return abbr1, abbr2
		}
	}
	return abbr1, abbr1
}