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)

package windows

import (
	"syscall"
	_ "unsafe"
)

//go:linkname WSASendtoInet4 syscall.wsaSendtoInet4
//go:noescape
func WSASendtoInet4(s syscall.Handle, bufs *syscall.WSABuf, bufcnt uint32, sent *uint32, flags uint32, to *syscall.SockaddrInet4, overlapped *syscall.Overlapped, croutine *byte) (err error)

//go:linkname WSASendtoInet6 syscall.wsaSendtoInet6
//go:noescape

}

func dtToType(typ uint8) FileMode {
	switch typ {
	case syscall.DT_BLK:
		return ModeDevice
	case syscall.DT_CHR:
		return ModeDevice | ModeCharDevice
	case syscall.DT_DIR:
		return ModeDir
	case syscall.DT_FIFO:
		return ModeNamedPipe
	case syscall.DT_LNK:
		return ModeSymlink
	case syscall.DT_REG:
		return 0
	case syscall.DT_SOCK:
		return ModeSocket
	}
	return ^FileMode(0)
}

		}
		return s, nil
	}

	// See ../syscall/exec_unix.go for description of ForkLock.
	syscall.ForkLock.RLock()
	s, err := socketFunc(family, sotype, proto)
	if err == nil {
		syscall.CloseOnExec(s)
	}
	syscall.ForkLock.RUnlock()
	if err != nil {
		return -1, os.NewSyscallError("socket", err)
	}
	if err = syscall.SetNonblock(s, true); err != nil {
		poll.CloseFunc(s)

//go:build js || wasip1

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
}

	globAllP, err := syscall.UTF16PtrFromString(globAll)
	if err != nil {
		return nil, errInvalidArgument
	}
	data := &syscall.Win32finddata{}
	handle, err := syscall.FindFirstFile(globAllP, data)
	if err != nil {
		return nil, syscallErrToFileErr(dirPath, err)
	}

	defer syscall.FindClose(handle)

	count := opts.count
	for ; count != 0; err = syscall.FindNextFile(handle, data) {

	return 4, map[int]*wireFormat{
		syscall.RTM_ADD:       rtm,
		syscall.RTM_DELETE:    rtm,
		syscall.RTM_CHANGE:    rtm,
		syscall.RTM_GET:       rtm,
		syscall.RTM_LOSING:    rtm,
		syscall.RTM_REDIRECT:  rtm,
		syscall.RTM_MISS:      rtm,
		syscall.RTM_LOCK:      rtm,
		syscall.RTM_RESOLVE:   rtm,
		syscall.RTM_NEWADDR:   ifam,
		syscall.RTM_DELADDR:   ifam,
		syscall.RTM_IFINFO:    ifm,
		syscall.RTM_NEWMADDR:  ifmam,

package race_test

import (
	"sync/atomic"
	"syscall"
	"testing"
	"unsafe"
)

// Test that race detector does not crash when accessing non-Go allocated memory (issue 9136).
func TestNonGoMemory(t *testing.T) {
	data, err := syscall.Mmap(-1, 0, 4096, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_ANON|syscall.MAP_PRIVATE)
	if err != nil {
		t.Fatalf("failed to mmap memory: %v", err)
	}

	"fmt"
	"internal/testenv"
	"io"
	"os"
	"syscall"
)

func gettid() int {
	return syscall.Gettid()
}

func tidExists(tid int) (exists, supported bool, err error) {
	// Open the magic proc status file for reading with the syscall package.
	// We want to identify certain valid errors very precisely.
	statusFile := fmt.Sprintf("/proc/self/task/%d/status", tid)
	fd, err := syscall.Open(statusFile, syscall.O_RDONLY, 0)

func TestPlan9Syserr(t *testing.T) {
	testalias(t,
		"Syscall",
		func() error {
			return syscall.Mkdir("/", 0)
		},
		func() error {
			return syscall.Mkdir("#", 0)
		})
	testalias(t,
		"Syscall6",
		func() error {
			return syscall.Mount(0, 0, "", 0, "")
		},
		func() error {
			return syscall.Mount(-1, 0, "", 0, "")
		})
	// originally failed only on plan9_arm
	testalias(t,