// multiple main packages.
func recompileForTest(pmain, preal, ptest, pxtest *Package) *PackageError {
	// The "test copy" of preal is ptest.
	// For each package that depends on preal, make a "test copy"
	// that depends on ptest. And so on, up the dependency tree.
	testCopy := map[*Package]*Package{preal: ptest}
	for _, p := range PackageList([]*Package{pmain}) {
		if p == preal {
			continue
		}
		// Copy on write.

	SYS___CLONE              = 287 // { pid_t|sys||__clone(int flags, void *stack); }
	SYS_FKTRACE              = 288 // { int|sys||fktrace(int fd, int ops, int facs, pid_t pid); }
	SYS_PREADV               = 289 // { ssize_t|sys||preadv(int fd, const struct iovec *iovp, int iovcnt, int PAD, off_t offset); }
	SYS_PWRITEV              = 290 // { ssize_t|sys||pwritev(int fd, const struct iovec *iovp, int iovcnt, int PAD, off_t offset); }

	SYS___CLONE              = 287 // { pid_t|sys||__clone(int flags, void *stack); }
	SYS_FKTRACE              = 288 // { int|sys||fktrace(int fd, int ops, int facs, pid_t pid); }
	SYS_PREADV               = 289 // { ssize_t|sys||preadv(int fd, const struct iovec *iovp, int iovcnt, int PAD, off_t offset); }
	SYS_PWRITEV              = 290 // { ssize_t|sys||pwritev(int fd, const struct iovec *iovp, int iovcnt, int PAD, off_t offset); }

	SYS___CLONE              = 287 // { pid_t|sys||__clone(int flags, void *stack); }
	SYS_FKTRACE              = 288 // { int|sys||fktrace(int fd, int ops, int facs, pid_t pid); }
	SYS_PREADV               = 289 // { ssize_t|sys||preadv(int fd, const struct iovec *iovp, int iovcnt, int PAD, off_t offset); }
	SYS_PWRITEV              = 290 // { ssize_t|sys||pwritev(int fd, const struct iovec *iovp, int iovcnt, int PAD, off_t offset); }

	// is about to try to preempt gp. Read it just once and use that same
	// value now and below.
	stackguard0 := atomic.Loaduintptr(&gp.stackguard0)

	// Be conservative about where we preempt.
	// We are interested in preempting user Go code, not runtime code.
	// If we're holding locks, mallocing, or preemption is disabled, don't
	// preempt.

	mremapFixed     = MAP_FIXED
	mremapDontunmap = 0
	mremapMaymove   = 0
)

//sys	mremapNetBSD(oldp uintptr, oldsize uintptr, newp uintptr, newsize uintptr, flags int) (xaddr uintptr, err error) = SYS_MREMAP

func mremap(oldaddr uintptr, oldlength uintptr, newlength uintptr, flags int, newaddr uintptr) (uintptr, error) {
	return mremapNetBSD(oldaddr, oldlength, newaddr, newlength, flags)

func Exit(code int) { exit(code) }

func readnum(path string) (uint, error) {
	var b [12]byte

	fd, e := Open(path, O_RDONLY)
	if e != nil {
		return 0, e
	}
	defer Close(fd)

	n, e := Pread(fd, b[:], 0)

	if e != nil {
		return 0, e
	}

	m := 0
	for ; m < n && b[m] == ' '; m++ {
	}

	return atoi(b[m : n-1]), nil
}

func Getpid() (pid int) {
	n, _ := readnum("#c/pid")

	pe := preemption.Evaluator{
		PluginName: names.DefaultPreemption,
		Handler:    pl.fh,
		PodLister:  pl.podLister,
		PdbLister:  pl.pdbLister,
		State:      state,
		Interface:  pl,
	}

	result, status := pe.Preempt(ctx, pod, m)
	msg := status.Message()
	if len(msg) > 0 {
		return result, framework.NewStatus(status.Code(), "preemption: "+msg)
	}
	return result, status
}

	//
	// TODO(mknyszek): Consider always checking gp.preempt instead
	// of having the preempt flag, and making an exception for certain
	// mark workers in retake. That might be simpler than trying to
	// enumerate all the reasons why we might want to preempt, even
	// if we're supposed to be mostly non-preemptible.
	for !(gp.preempt && (preemptible || sched.gcwaiting.Load() || pp.runSafePointFn != 0)) {

	return f.Ignorable
}

// SupportsPreemption returns true indicating the extender supports preemption.
func (f *FakeExtender) SupportsPreemption() bool {
	// Assume preempt verb is always defined.
	return true
}

// ProcessPreemption implements the extender preempt function.
func (f *FakeExtender) ProcessPreemption(
	pod *v1.Pod,
	nodeNameToVictims map[string]*extenderv1.Victims,
	nodeInfos framework.NodeInfoLister,