secs := int(roundDurationUp(d, time.Second))
	err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, windows.TCP_KEEPINTVL, secs)
	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)

// license that can be found in the LICENSE file.

//go:build unix || windows

package net

import (
	"runtime"
	"syscall"
)

func setNoDelay(fd *netFD, noDelay bool) error {
	err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, syscall.TCP_NODELAY, boolint(noDelay))
	runtime.KeepAlive(fd)
	return wrapSyscallError("setsockopt", err)

		if err != nil {
			t.Fatalf("Socketpair: %v", err)
		}

		err = syscall.SetsockoptInt(fds[0], syscall.SOL_SOCKET, syscall.SO_PASSCRED, 1)
		if err != nil {
			syscall.Close(fds[0])
			syscall.Close(fds[1])
			t.Fatalf("SetsockoptInt: %v", err)
		}

		srvFile := os.NewFile(uintptr(fds[0]), "server")
		cliFile := os.NewFile(uintptr(fds[1]), "client")

func reuseAddr(network, address string, conn syscall.RawConn) error {
	return conn.Control(func(descriptor uintptr) {
		err := unix.SetsockoptInt(int(descriptor), unix.SOL_SOCKET, unix.SO_REUSEADDR, 1)
		if err != nil {
			log.Errorf("Fail to set fd %d SO_REUSEADDR with error %v", descriptor, err)
		}
		err = unix.SetsockoptInt(int(descriptor), unix.SOL_SOCKET, unix.SO_REUSEPORT, 1)
		if err != nil {

	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)

		supportTCPKeepAliveCount = major >= 10 && build >= 15063
		return
	}
	defer syscall.Closesocket(s)
	var optSupported = func(opt int) bool {
		err := syscall.SetsockoptInt(s, syscall.IPPROTO_TCP, opt, 1)
		return !errors.Is(err, syscall.WSAENOPROTOOPT)
	}
	supportTCPKeepAliveIdle = optSupported(TCP_KEEPIDLE)
	supportTCPKeepAliveInterval = optSupported(TCP_KEEPINTVL)

	data="runtime.(*wakeableSleep).sleep"
String id=128
	data="runtime.traceStartReadCPU.func1"
String id=129
	data="syscall.setsockopt"
String id=130
	data="syscall.SetsockoptInt"
String id=131
	data="internal/poll.(*FD).SetsockoptInt"
String id=132
	data="/usr/local/google/home/mknyszek/work/go-1/src/internal/poll/sockopt.go"
String id=133
	data="net.setKeepAlivePeriod"
String id=134

		probes = probes[:1]
	}
	for i := range probes {
		s, err := sysSocket(syscall.AF_INET6, syscall.SOCK_STREAM, syscall.IPPROTO_TCP)
		if err != nil {
			continue
		}
		defer poll.CloseFunc(s)
		syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_V6ONLY, probes[i].value)
		sa, err := probes[i].laddr.sockaddr(syscall.AF_INET6)
		if err != nil {
			continue
		}
		if err := syscall.Bind(s, sa); err != nil {
			continue
		}

pkg syscall (freebsd-arm64), func GetsockoptICMPv6Filter(int, int, int) (*ICMPv6Filter, error)
pkg syscall (freebsd-arm64), func GetsockoptInet4Addr(int, int, int) ([4]uint8, error)
pkg syscall (freebsd-arm64), func GetsockoptInt(int, int, int) (int, error)
pkg syscall (freebsd-arm64), func GetsockoptIPMreq(int, int, int) (*IPMreq, error)
pkg syscall (freebsd-arm64), func GetsockoptIPMreqn(int, int, int) (*IPMreqn, error)

pkg syscall (darwin-arm64), func GetsockoptIPv6Mreq(int, int, int) (*IPv6Mreq, error)
pkg syscall (darwin-arm64), func GetsockoptInet4Addr(int, int, int) ([4]uint8, error)
pkg syscall (darwin-arm64), func GetsockoptInt(int, int, int) (int, error)
pkg syscall (darwin-arm64), func Issetugid() bool
pkg syscall (darwin-arm64), func Kevent(int, []Kevent_t, []Kevent_t, *Timespec) (int, error)