runtime.KeepAlive(fd)
	return wrapSyscallError("setsockopt", err)
}

func setKeepAliveCount(fd *netFD, n int) error {
	if n == 0 {
		n = defaultTCPKeepAliveCount
	} else if n < 0 {
		return nil
	}

	err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, syscall.TCP_KEEPCNT, n)
	runtime.KeepAlive(fd)
	return wrapSyscallError("setsockopt", err)

	secs := int(roundDurationUp(d, time.Second))
	err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, sysTCP_KEEPIDLE, secs)
	runtime.KeepAlive(fd)
	return wrapSyscallError("setsockopt", err)
}

func setKeepAliveInterval(fd *netFD, d time.Duration) error {
	if !unix.SupportTCPKeepAliveIdleIntvlCNT() {
		return syscall.EPROTOTYPE
	}

	if d == 0 {
		d = defaultTCPKeepAliveInterval

package poll

import "syscall"

// SetsockoptIPMreq wraps the setsockopt network call with an IPMreq argument.
func (fd *FD) SetsockoptIPMreq(level, name int, mreq *syscall.IPMreq) error {
	if err := fd.incref(); err != nil {
		return err
	}
	defer fd.decref()
	return syscall.SetsockoptIPMreq(fd.Sysfd, level, name, mreq)
}

// SetsockoptIPv6Mreq wraps the setsockopt network call with an IPv6Mreq argument.

	runtime.KeepAlive(fd)
	return wrapSyscallError("setsockopt", err)
}

func setIPv4MulticastLoopback(fd *netFD, v bool) error {
	err := fd.pfd.SetsockoptInt(syscall.IPPROTO_IP, syscall.IP_MULTICAST_LOOP, boolint(v))
	runtime.KeepAlive(fd)
	return wrapSyscallError("setsockopt", err)

	runtime.KeepAlive(fd)
	return os.NewSyscallError("setsockopt", err)
}

func setKeepAliveCount(fd *netFD, n int) error {
	if n == 0 {
		n = defaultTCPKeepAliveCount
	} else if n < 0 {
		return nil
	}

	err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, windows.TCP_KEEPCNT, n)
	runtime.KeepAlive(fd)
	return os.NewSyscallError("setsockopt", err)
}

	}
	if (sotype == syscall.SOCK_DGRAM || sotype == syscall.SOCK_RAW) && family != syscall.AF_UNIX && family != syscall.AF_INET6 {
		// Allow broadcast.
		return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_BROADCAST, 1))
	}
	return nil
}

func setDefaultListenerSockopts(s syscall.Handle) error {
	// Windows will reuse recently-used addresses by default.

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build unix

package poll

import "syscall"

// SetsockoptByte wraps the setsockopt network call with a byte argument.
func (fd *FD) SetsockoptByte(level, name int, arg byte) error {
	if err := fd.incref(); err != nil {
		return err
	}
	defer fd.decref()

// keep them accessible with pull linknames.
// This may change in the future. Please do not depend on them
// in new code.

// golang.org/x/sys linknames getsockopt.
// Do not remove or change the type signature.
//
//go:linkname getsockopt

// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package poll

import "syscall"

// SetsockoptIPMreqn wraps the setsockopt network call with an IPMreqn argument.
func (fd *FD) SetsockoptIPMreqn(level, name int, mreq *syscall.IPMreqn) error {
	if err := fd.incref(); err != nil {
		return err
	}
	defer fd.decref()

	var p SockFprog
	p.Len = uint16(len(i))
	p.Filter = (*SockFilter)(unsafe.Pointer(&i[0]))
	return setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, unsafe.Pointer(&p), unsafe.Sizeof(p))
}

// Deprecated: Use golang.org/x/net/bpf instead.
func DetachLsf(fd int) error {
	var dummy int
	return setsockopt(fd, SOL_SOCKET, SO_DETACH_FILTER, unsafe.Pointer(&dummy), unsafe.Sizeof(dummy))