netfd.setAddr(netfd.addrFunc()(lsa), netfd.addrFunc()(rsa))
	return netfd, nil
}

// Defined in os package.
func newUnixFile(fd int, name string) *os.File

func (fd *netFD) dup() (f *os.File, err error) {
	ns, call, err := fd.pfd.Dup()
	if err != nil {
		if call != "" {
			err = os.NewSyscallError(call, err)
		}
		return nil, err
	}

	return newUnixFile(ns, fd.name()), nil

		// number of net tests that can run concurrently so that the overall number
		// of network connections won't exceed the limit.
		_, dup := scriptNetEnabled.LoadOrStore(t, true)
		if !dup {
			// Acquire a net token for this test until the test completes.
			netTestSem <- struct{}{}
			t.Cleanup(func() {
				<-netTestSem
				scriptNetEnabled.Delete(t)
			})
		}
	}

}

// Implemented in runtime package.
func runtime_BeforeFork()
func runtime_AfterFork()
func runtime_AfterForkInChild()

// Fork, dup fd onto 0..len(fd), and exec(argv0, argvv, envv) in child.
// If a dup or exec fails, write the errno error to pipe.
// (Pipe is close-on-exec so if exec succeeds, it will be closed.)
// In the child, this function must not acquire any locks, because

// syscall defines this global on our behalf to avoid a build dependency on other platforms
func init() {
	execveLibc = execve
}

// Fork, dup fd onto 0..len(fd), and exec(argv0, argvv, envv) in child.
// If a dup or exec fails, write the errno error to pipe.
// (Pipe is close-on-exec so if exec succeeds, it will be closed.)
// In the child, this function must not acquire any locks, because

import static org.objectweb.asm.Opcodes.ASTORE;
import static org.objectweb.asm.Opcodes.ATHROW;
import static org.objectweb.asm.Opcodes.CHECKCAST;
import static org.objectweb.asm.Opcodes.DCONST_0;
import static org.objectweb.asm.Opcodes.DUP;
import static org.objectweb.asm.Opcodes.FCONST_0;
import static org.objectweb.asm.Opcodes.GETFIELD;
import static org.objectweb.asm.Opcodes.GETSTATIC;
import static org.objectweb.asm.Opcodes.GOTO;

		// ignore "no match" errors, but any other error percolates back up
		if IsNoMatchError(err) {
			continue
		}
		if err != nil {
			return nil, err
		}

		// walk the existing values to de-dup
		for _, curr := range gvrs {
			found := false
			for _, existing := range allGVRs {
				if curr == existing {
					found = true
					break
				}
			}

			if !found {
				allGVRs = append(allGVRs, curr)

	// unlock calls that refer to the same inode through different descriptors.
	fi, err := f.Stat()
	if err != nil {
		return err
	}
	ino := fi.Sys().(*syscall.Stat_t).Ino

	mu.Lock()
	if i, dup := inodes[f]; dup && i != ino {
		mu.Unlock()
		return &fs.PathError{
			Op:   lt.String(),
			Path: f.Name(),
			Err:  errors.New("inode for file changed since last Lock or RLock"),
		}
	}
	inodes[f] = ino

	kind      Kind
	arg, want any
}

func dup(k Kind, x any) makeTestCase { return makeTestCase{k, x, x} }

func TestMake(t *testing.T) {
	for _, test := range []makeTestCase{
		{Bool, false, false},
		{String, "hello", "hello"},

		{Int, int64(1), int64(1)},
		{Int, big.NewInt(10), int64(10)},
		{Int, new(big.Int).Lsh(big.NewInt(1), 62), int64(1 << 62)},
		dup(Int, new(big.Int).Lsh(big.NewInt(1), 63)),

		ln.fd.ctl.Close()
		return err
	}
	if err := ln.fd.ctl.Close(); err != nil {
		return err
	}
	return nil
}

func (ln *TCPListener) file() (*os.File, error) {
	f, err := ln.dup()
	if err != nil {
		return nil, err
	}
	return f, nil
}

func (sl *sysListener) listenTCP(ctx context.Context, laddr *TCPAddr) (*TCPListener, error) {
	fd, err := listenPlan9(ctx, sl.network, laddr)

	}

	// Truncate reqs to its capacity to avoid aliasing bugs if it is later
	// returned from RequiredBy and appended to.
	reqs = slices.Clip(reqs)

	if _, dup := g.required[m]; dup {
		panic(fmt.Sprintf("requirements of %v have already been set", m))
	}
	g.required[m] = reqs

	for _, dep := range reqs {
		// Mark dep reachable, regardless of whether it is selected.