if err != nil {
		t.Fatal(err)
	}
	err = rawconn.Control(func(fd uintptr) {
		nonblock, err := unix.IsNonblock(int(fd))
		if err != nil {
			t.Fatal(err)
		}
		if !nonblock {
			t.Fatal("unix socket as os.File is in blocking mode")
		}
	})
	if err != nil {
		t.Fatal(err)
	}

	fd := file.Fd()

	// Calling Fd should have put the descriptor into blocking mode.

//go:build js

package net

import (
	"os"
	"syscall"
)

func (fd *netFD) closeRead() error {
	if fd.fakeNetFD != nil {
		return fd.fakeNetFD.closeRead()
	}
	return os.NewSyscallError("closeRead", syscall.ENOTSUP)
}

func (fd *netFD) closeWrite() error {
	if fd.fakeNetFD != nil {
		return fd.fakeNetFD.closeWrite()
	}
	return os.NewSyscallError("closeRead", syscall.ENOTSUP)

	"time"
)

func getCurrentKeepAliveSettings(fd fdType) (cfg KeepAliveConfig, err error) {
	tcpKeepAlive, err := syscall.GetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_KEEPALIVE)
	if err != nil {
		return
	}
	tcpKeepAliveIdle, err := syscall.GetsockoptInt(fd, syscall.IPPROTO_TCP, syscall_TCP_KEEPIDLE)
	if err != nil {
		return
	}
	tcpKeepAliveInterval, err := syscall.GetsockoptInt(fd, syscall.IPPROTO_TCP, syscall_TCP_KEEPINTVL)

			if err1 != 0 {
				goto childerror
			}
			fd[i] = nextfd
			nextfd++
		}
	}

	// Pass 2: dup fd[i] down onto i.
	for i = 0; i < len(fd); i++ {
		if fd[i] == -1 {
			closeFD(uintptr(i))
			continue
		}
		if fd[i] == i {
			// dup2(i, i) won't clear close-on-exec flag on Linux,
			// probably not elsewhere either.
			_, err1 = fcntl1(uintptr(fd[i]), F_SETFD, 0)
			if err1 != 0 {

//sys	Fadvise(fd int, offset int64, length int64, advice int) (err error) = SYS_FADVISE64
//sys	Fchown(fd int, uid int, gid int) (err error)
//sys	Fstat(fd int, stat *Stat_t) (err error)
//sys	Fstatat(fd int, path string, stat *Stat_t, flags int) (err error)
//sys	Fstatfs(fd int, buf *Statfs_t) (err error)
//sys	Ftruncate(fd int, length int64) (err error)
//sysnb	Getegid() (egid int)

	return CloseFunc(fd)
}

// Copy creates a copy of the FD.
//
// The FD instance points to the same underlying file descriptor. The file
// descriptor isn't closed until all FD instances that refer to it have been
// closed/destroyed.
func (fd *FD) Copy() FD {
	return FD{
		Sysfd:         fd.Sysfd,
		SysFile:       fd.SysFile.ref(),
		IsStream:      fd.IsStream,
		ZeroReadIsEOF: fd.ZeroReadIsEOF,

}

// Deprecated: Use golang.org/x/net/bpf instead.
func BpfBuflen(fd int) (int, error) {
	var l int
	err := ioctlPtr(fd, BIOCGBLEN, unsafe.Pointer(&l))
	if err != nil {
		return 0, err
	}
	return l, nil
}

// Deprecated: Use golang.org/x/net/bpf instead.
func SetBpfBuflen(fd, l int) (int, error) {
	err := ioctlPtr(fd, BIOCSBLEN, unsafe.Pointer(&l))
	if err != nil {
		return 0, err
	}
	return l, nil

package net

import "syscall"

func setIPv4MulticastInterface(fd *netFD, ifi *Interface) error {
	return syscall.ENOPROTOOPT
}

func setIPv4MulticastLoopback(fd *netFD, v bool) error {
	return syscall.ENOPROTOOPT
}

func joinIPv4Group(fd *netFD, ifi *Interface, ip IP) error {
	return syscall.ENOPROTOOPT
}

func setIPv6MulticastInterface(fd *netFD, ifi *Interface) error {
	return syscall.ENOPROTOOPT
}

}

func (ln *TCPListener) ok() bool { return ln != nil && ln.fd != nil }

func (ln *TCPListener) accept() (*TCPConn, error) {
	fd, err := ln.fd.accept()
	if err != nil {
		return nil, err
	}
	return newTCPConn(fd, ln.lc.KeepAlive, ln.lc.KeepAliveConfig, testPreHookSetKeepAlive, testHookSetKeepAlive), nil
}

func (ln *TCPListener) close() error {
	return ln.fd.Close()
}

//go:build solaris && !illumos

package net

import (
	"internal/syscall/unix"
	"syscall"
	"testing"
	"time"
)

func getCurrentKeepAliveSettings(fd fdType) (cfg KeepAliveConfig, err error) {
	tcpKeepAlive, err := syscall.GetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_KEEPALIVE)
	if err != nil {
		return
	}

	var (
		tcpKeepAliveIdle         int
		tcpKeepAliveInterval     int