_ = unix.SetsockoptInt(fd, unix.SOL_SOCKET, unix.SO_REUSEADDR, 1)

			_ = unix.SetsockoptInt(fd, unix.SOL_SOCKET, unix.SO_REUSEPORT, 1)

			// Enable custom socket send/recv buffers.
			if opts.SendBufSize > 0 {
				_ = unix.SetsockoptInt(fd, unix.SOL_SOCKET, unix.SO_SNDBUF, opts.SendBufSize)
			}

			if opts.RecvBufSize > 0 {
				_ = unix.SetsockoptInt(fd, unix.SOL_SOCKET, unix.SO_RCVBUF, opts.RecvBufSize)
			}

	switch runtime.GOOS {
	case "js", "wasip1":
		// Both ipv4 and ipv6 are faked; see net_fake.go.
		p.ipv4Enabled = true
		p.ipv6Enabled = true
		p.ipv4MappedIPv6Enabled = true
		return
	}

	s, err := sysSocket(syscall.AF_INET, syscall.SOCK_STREAM, syscall.IPPROTO_TCP)
	switch err {
	case syscall.EAFNOSUPPORT, syscall.EPROTONOSUPPORT:
	case nil:
		poll.CloseFunc(s)
		p.ipv4Enabled = true
	}
	var probes = []struct {

  try {
    close()
  } catch (e: AssertionError) {
    throw e
  } catch (rethrown: RuntimeException) {
    if (rethrown.message == "bio == null") {
      // Conscrypt in Android 10 and 11 may throw closing an SSLSocket. This is safe to ignore.
      // https://issuetracker.google.com/issues/177450597
      return
    }
    throw rethrown
  } catch (_: Exception) {
  }
}

	var iov Iovec
	if len(p) > 0 {
		iov.Base = &p[0]
		iov.SetLen(len(p))
	}
	var dummy byte
	if len(oob) > 0 {
		var sockType int
		sockType, err = GetsockoptInt(fd, SOL_SOCKET, SO_TYPE)
		if err != nil {
			return
		}
		// receive at least one normal byte
		if sockType != SOCK_DGRAM && len(p) == 0 {
			iov.Base = &dummy
			iov.SetLen(1)
		}
		msg.Control = &oob[0]

	var iov Iovec
	if len(p) > 0 {
		iov.Base = &p[0]
		iov.SetLen(len(p))
	}
	var dummy byte
	if len(oob) > 0 {
		if len(p) == 0 {
			var sockType int
			sockType, err = GetsockoptInt(fd, SOL_SOCKET, SO_TYPE)
			if err != nil {
				return
			}
			// receive at least one normal byte
			if sockType != SOCK_DGRAM {
				iov.Base = &dummy
				iov.SetLen(1)
			}
		}
		msg.Control = &oob[0]

	SIOCSPGRP                        = 0x8902
	SOCK_CLOEXEC                     = 0x80000
	SOCK_DGRAM                       = 0x2
	SOCK_NONBLOCK                    = 0x800
	SOCK_STREAM                      = 0x1
	SOL_SOCKET                       = 0x1
	SO_ACCEPTCONN                    = 0x1e
	SO_ATTACH_BPF                    = 0x32
	SO_ATTACH_REUSEPORT_CBPF         = 0x33
	SO_ATTACH_REUSEPORT_EBPF         = 0x34

	SIOCSPGRP                        = 0x8902
	SOCK_CLOEXEC                     = 0x80000
	SOCK_DGRAM                       = 0x2
	SOCK_NONBLOCK                    = 0x800
	SOCK_STREAM                      = 0x1
	SOL_SOCKET                       = 0x1
	SO_ACCEPTCONN                    = 0x1e
	SO_ATTACH_BPF                    = 0x32
	SO_ATTACH_REUSEPORT_CBPF         = 0x33
	SO_ATTACH_REUSEPORT_EBPF         = 0x34

	SIOCSPGRP                        = 0x8902
	SOCK_CLOEXEC                     = 0x80000
	SOCK_DGRAM                       = 0x2
	SOCK_NONBLOCK                    = 0x800
	SOCK_STREAM                      = 0x1
	SOL_SOCKET                       = 0x1
	SO_ACCEPTCONN                    = 0x1e
	SO_ATTACH_BPF                    = 0x32
	SO_ATTACH_REUSEPORT_CBPF         = 0x33
	SO_ATTACH_REUSEPORT_EBPF         = 0x34

	SOCK_STREAM                   = 0x2
	SOCK_TYPE_MASK                = 0xffff
	SOL_FILTER                    = 0xfffc
	SOL_PACKET                    = 0xfffd
	SOL_ROUTE                     = 0xfffe
	SOL_SOCKET                    = 0xffff
	SOMAXCONN                     = 0x80
	SO_ACCEPTCONN                 = 0x2
	SO_ALL                        = 0x3f
	SO_ALLZONES                   = 0x1014