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Source file src/syscall/syscall_windows.go

Documentation: syscall

  // Copyright 2009 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.
  
  // Windows system calls.
  
  package syscall
  
  import (
  	errorspkg "errors"
  	"internal/race"
  	"sync"
  	"unicode/utf16"
  	"unsafe"
  )
  
  type Handle uintptr
  
  const InvalidHandle = ^Handle(0)
  
  // StringToUTF16 returns the UTF-16 encoding of the UTF-8 string s,
  // with a terminating NUL added. If s contains a NUL byte this
  // function panics instead of returning an error.
  //
  // Deprecated: Use UTF16FromString instead.
  func StringToUTF16(s string) []uint16 {
  	a, err := UTF16FromString(s)
  	if err != nil {
  		panic("syscall: string with NUL passed to StringToUTF16")
  	}
  	return a
  }
  
  // UTF16FromString returns the UTF-16 encoding of the UTF-8 string
  // s, with a terminating NUL added. If s contains a NUL byte at any
  // location, it returns (nil, EINVAL).
  func UTF16FromString(s string) ([]uint16, error) {
  	for i := 0; i < len(s); i++ {
  		if s[i] == 0 {
  			return nil, EINVAL
  		}
  	}
  	return utf16.Encode([]rune(s + "\x00")), nil
  }
  
  // UTF16ToString returns the UTF-8 encoding of the UTF-16 sequence s,
  // with a terminating NUL removed.
  func UTF16ToString(s []uint16) string {
  	for i, v := range s {
  		if v == 0 {
  			s = s[0:i]
  			break
  		}
  	}
  	return string(utf16.Decode(s))
  }
  
  // StringToUTF16Ptr returns pointer to the UTF-16 encoding of
  // the UTF-8 string s, with a terminating NUL added. If s
  // contains a NUL byte this function panics instead of
  // returning an error.
  //
  // Deprecated: Use UTF16PtrFromString instead.
  func StringToUTF16Ptr(s string) *uint16 { return &StringToUTF16(s)[0] }
  
  // UTF16PtrFromString returns pointer to the UTF-16 encoding of
  // the UTF-8 string s, with a terminating NUL added. If s
  // contains a NUL byte at any location, it returns (nil, EINVAL).
  func UTF16PtrFromString(s string) (*uint16, error) {
  	a, err := UTF16FromString(s)
  	if err != nil {
  		return nil, err
  	}
  	return &a[0], nil
  }
  
  // Errno is the Windows error number.
  type Errno uintptr
  
  func langid(pri, sub uint16) uint32 { return uint32(sub)<<10 | uint32(pri) }
  
  // FormatMessage is deprecated (msgsrc should be uintptr, not uint32, but can
  // not be changed due to the Go 1 compatibility guarantee).
  //
  // Deprecated: Use FormatMessage from golang.org/x/sys/windows instead.
  func FormatMessage(flags uint32, msgsrc uint32, msgid uint32, langid uint32, buf []uint16, args *byte) (n uint32, err error) {
  	return formatMessage(flags, uintptr(msgsrc), msgid, langid, buf, args)
  }
  
  func (e Errno) Error() string {
  	// deal with special go errors
  	idx := int(e - APPLICATION_ERROR)
  	if 0 <= idx && idx < len(errors) {
  		return errors[idx]
  	}
  	// ask windows for the remaining errors
  	var flags uint32 = FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ARGUMENT_ARRAY | FORMAT_MESSAGE_IGNORE_INSERTS
  	b := make([]uint16, 300)
  	n, err := formatMessage(flags, 0, uint32(e), langid(LANG_ENGLISH, SUBLANG_ENGLISH_US), b, nil)
  	if err != nil {
  		n, err = formatMessage(flags, 0, uint32(e), 0, b, nil)
  		if err != nil {
  			return "winapi error #" + itoa(int(e))
  		}
  	}
  	// trim terminating \r and \n
  	for ; n > 0 && (b[n-1] == '\n' || b[n-1] == '\r'); n-- {
  	}
  	return string(utf16.Decode(b[:n]))
  }
  
  func (e Errno) Temporary() bool {
  	return e == EINTR || e == EMFILE || e == WSAECONNABORTED || e == WSAECONNRESET || e.Timeout()
  }
  
  func (e Errno) Timeout() bool {
  	return e == EAGAIN || e == EWOULDBLOCK || e == ETIMEDOUT
  }
  
  // Implemented in runtime/syscall_windows.go.
  func compileCallback(fn interface{}, cleanstack bool) uintptr
  
  // Converts a Go function to a function pointer conforming
  // to the stdcall calling convention. This is useful when
  // interoperating with Windows code requiring callbacks.
  func NewCallback(fn interface{}) uintptr {
  	return compileCallback(fn, true)
  }
  
  // Converts a Go function to a function pointer conforming
  // to the cdecl calling convention. This is useful when
  // interoperating with Windows code requiring callbacks.
  func NewCallbackCDecl(fn interface{}) uintptr {
  	return compileCallback(fn, false)
  }
  
  // windows api calls
  
  //sys	GetLastError() (lasterr error)
  //sys	LoadLibrary(libname string) (handle Handle, err error) = LoadLibraryW
  //sys	FreeLibrary(handle Handle) (err error)
  //sys	GetProcAddress(module Handle, procname string) (proc uintptr, err error)
  //sys	GetVersion() (ver uint32, err error)
  //sys	formatMessage(flags uint32, msgsrc uintptr, msgid uint32, langid uint32, buf []uint16, args *byte) (n uint32, err error) = FormatMessageW
  //sys	ExitProcess(exitcode uint32)
  //sys	CreateFile(name *uint16, access uint32, mode uint32, sa *SecurityAttributes, createmode uint32, attrs uint32, templatefile int32) (handle Handle, err error) [failretval==InvalidHandle] = CreateFileW
  //sys	ReadFile(handle Handle, buf []byte, done *uint32, overlapped *Overlapped) (err error)
  //sys	WriteFile(handle Handle, buf []byte, done *uint32, overlapped *Overlapped) (err error)
  //sys	SetFilePointer(handle Handle, lowoffset int32, highoffsetptr *int32, whence uint32) (newlowoffset uint32, err error) [failretval==0xffffffff]
  //sys	CloseHandle(handle Handle) (err error)
  //sys	GetStdHandle(stdhandle int) (handle Handle, err error) [failretval==InvalidHandle]
  //sys	findFirstFile1(name *uint16, data *win32finddata1) (handle Handle, err error) [failretval==InvalidHandle] = FindFirstFileW
  //sys	findNextFile1(handle Handle, data *win32finddata1) (err error) = FindNextFileW
  //sys	FindClose(handle Handle) (err error)
  //sys	GetFileInformationByHandle(handle Handle, data *ByHandleFileInformation) (err error)
  //sys	GetCurrentDirectory(buflen uint32, buf *uint16) (n uint32, err error) = GetCurrentDirectoryW
  //sys	SetCurrentDirectory(path *uint16) (err error) = SetCurrentDirectoryW
  //sys	CreateDirectory(path *uint16, sa *SecurityAttributes) (err error) = CreateDirectoryW
  //sys	RemoveDirectory(path *uint16) (err error) = RemoveDirectoryW
  //sys	DeleteFile(path *uint16) (err error) = DeleteFileW
  //sys	MoveFile(from *uint16, to *uint16) (err error) = MoveFileW
  //sys	GetComputerName(buf *uint16, n *uint32) (err error) = GetComputerNameW
  //sys	SetEndOfFile(handle Handle) (err error)
  //sys	GetSystemTimeAsFileTime(time *Filetime)
  //sys	GetTimeZoneInformation(tzi *Timezoneinformation) (rc uint32, err error) [failretval==0xffffffff]
  //sys	CreateIoCompletionPort(filehandle Handle, cphandle Handle, key uint32, threadcnt uint32) (handle Handle, err error)
  //sys	GetQueuedCompletionStatus(cphandle Handle, qty *uint32, key *uint32, overlapped **Overlapped, timeout uint32) (err error)
  //sys	PostQueuedCompletionStatus(cphandle Handle, qty uint32, key uint32, overlapped *Overlapped) (err error)
  //sys	CancelIo(s Handle) (err error)
  //sys	CancelIoEx(s Handle, o *Overlapped) (err error)
  //sys	CreateProcess(appName *uint16, commandLine *uint16, procSecurity *SecurityAttributes, threadSecurity *SecurityAttributes, inheritHandles bool, creationFlags uint32, env *uint16, currentDir *uint16, startupInfo *StartupInfo, outProcInfo *ProcessInformation) (err error) = CreateProcessW
  //sys	OpenProcess(da uint32, inheritHandle bool, pid uint32) (handle Handle, err error)
  //sys	TerminateProcess(handle Handle, exitcode uint32) (err error)
  //sys	GetExitCodeProcess(handle Handle, exitcode *uint32) (err error)
  //sys	GetStartupInfo(startupInfo *StartupInfo) (err error) = GetStartupInfoW
  //sys	GetCurrentProcess() (pseudoHandle Handle, err error)
  //sys	GetProcessTimes(handle Handle, creationTime *Filetime, exitTime *Filetime, kernelTime *Filetime, userTime *Filetime) (err error)
  //sys	DuplicateHandle(hSourceProcessHandle Handle, hSourceHandle Handle, hTargetProcessHandle Handle, lpTargetHandle *Handle, dwDesiredAccess uint32, bInheritHandle bool, dwOptions uint32) (err error)
  //sys	WaitForSingleObject(handle Handle, waitMilliseconds uint32) (event uint32, err error) [failretval==0xffffffff]
  //sys	GetTempPath(buflen uint32, buf *uint16) (n uint32, err error) = GetTempPathW
  //sys	CreatePipe(readhandle *Handle, writehandle *Handle, sa *SecurityAttributes, size uint32) (err error)
  //sys	GetFileType(filehandle Handle) (n uint32, err error)
  //sys	CryptAcquireContext(provhandle *Handle, container *uint16, provider *uint16, provtype uint32, flags uint32) (err error) = advapi32.CryptAcquireContextW
  //sys	CryptReleaseContext(provhandle Handle, flags uint32) (err error) = advapi32.CryptReleaseContext
  //sys	CryptGenRandom(provhandle Handle, buflen uint32, buf *byte) (err error) = advapi32.CryptGenRandom
  //sys	GetEnvironmentStrings() (envs *uint16, err error) [failretval==nil] = kernel32.GetEnvironmentStringsW
  //sys	FreeEnvironmentStrings(envs *uint16) (err error) = kernel32.FreeEnvironmentStringsW
  //sys	GetEnvironmentVariable(name *uint16, buffer *uint16, size uint32) (n uint32, err error) = kernel32.GetEnvironmentVariableW
  //sys	SetEnvironmentVariable(name *uint16, value *uint16) (err error) = kernel32.SetEnvironmentVariableW
  //sys	SetFileTime(handle Handle, ctime *Filetime, atime *Filetime, wtime *Filetime) (err error)
  //sys	GetFileAttributes(name *uint16) (attrs uint32, err error) [failretval==INVALID_FILE_ATTRIBUTES] = kernel32.GetFileAttributesW
  //sys	SetFileAttributes(name *uint16, attrs uint32) (err error) = kernel32.SetFileAttributesW
  //sys	GetFileAttributesEx(name *uint16, level uint32, info *byte) (err error) = kernel32.GetFileAttributesExW
  //sys	GetCommandLine() (cmd *uint16) = kernel32.GetCommandLineW
  //sys	CommandLineToArgv(cmd *uint16, argc *int32) (argv *[8192]*[8192]uint16, err error) [failretval==nil] = shell32.CommandLineToArgvW
  //sys	LocalFree(hmem Handle) (handle Handle, err error) [failretval!=0]
  //sys	SetHandleInformation(handle Handle, mask uint32, flags uint32) (err error)
  //sys	FlushFileBuffers(handle Handle) (err error)
  //sys	GetFullPathName(path *uint16, buflen uint32, buf *uint16, fname **uint16) (n uint32, err error) = kernel32.GetFullPathNameW
  //sys	GetLongPathName(path *uint16, buf *uint16, buflen uint32) (n uint32, err error) = kernel32.GetLongPathNameW
  //sys	GetShortPathName(longpath *uint16, shortpath *uint16, buflen uint32) (n uint32, err error) = kernel32.GetShortPathNameW
  //sys	CreateFileMapping(fhandle Handle, sa *SecurityAttributes, prot uint32, maxSizeHigh uint32, maxSizeLow uint32, name *uint16) (handle Handle, err error) = kernel32.CreateFileMappingW
  //sys	MapViewOfFile(handle Handle, access uint32, offsetHigh uint32, offsetLow uint32, length uintptr) (addr uintptr, err error)
  //sys	UnmapViewOfFile(addr uintptr) (err error)
  //sys	FlushViewOfFile(addr uintptr, length uintptr) (err error)
  //sys	VirtualLock(addr uintptr, length uintptr) (err error)
  //sys	VirtualUnlock(addr uintptr, length uintptr) (err error)
  //sys	TransmitFile(s Handle, handle Handle, bytesToWrite uint32, bytsPerSend uint32, overlapped *Overlapped, transmitFileBuf *TransmitFileBuffers, flags uint32) (err error) = mswsock.TransmitFile
  //sys	ReadDirectoryChanges(handle Handle, buf *byte, buflen uint32, watchSubTree bool, mask uint32, retlen *uint32, overlapped *Overlapped, completionRoutine uintptr) (err error) = kernel32.ReadDirectoryChangesW
  //sys	CertOpenSystemStore(hprov Handle, name *uint16) (store Handle, err error) = crypt32.CertOpenSystemStoreW
  //sys   CertOpenStore(storeProvider uintptr, msgAndCertEncodingType uint32, cryptProv uintptr, flags uint32, para uintptr) (handle Handle, err error) [failretval==InvalidHandle] = crypt32.CertOpenStore
  //sys	CertEnumCertificatesInStore(store Handle, prevContext *CertContext) (context *CertContext, err error) [failretval==nil] = crypt32.CertEnumCertificatesInStore
  //sys   CertAddCertificateContextToStore(store Handle, certContext *CertContext, addDisposition uint32, storeContext **CertContext) (err error) = crypt32.CertAddCertificateContextToStore
  //sys	CertCloseStore(store Handle, flags uint32) (err error) = crypt32.CertCloseStore
  //sys   CertGetCertificateChain(engine Handle, leaf *CertContext, time *Filetime, additionalStore Handle, para *CertChainPara, flags uint32, reserved uintptr, chainCtx **CertChainContext) (err error) = crypt32.CertGetCertificateChain
  //sys   CertFreeCertificateChain(ctx *CertChainContext) = crypt32.CertFreeCertificateChain
  //sys   CertCreateCertificateContext(certEncodingType uint32, certEncoded *byte, encodedLen uint32) (context *CertContext, err error) [failretval==nil] = crypt32.CertCreateCertificateContext
  //sys   CertFreeCertificateContext(ctx *CertContext) (err error) = crypt32.CertFreeCertificateContext
  //sys   CertVerifyCertificateChainPolicy(policyOID uintptr, chain *CertChainContext, para *CertChainPolicyPara, status *CertChainPolicyStatus) (err error) = crypt32.CertVerifyCertificateChainPolicy
  //sys	RegOpenKeyEx(key Handle, subkey *uint16, options uint32, desiredAccess uint32, result *Handle) (regerrno error) = advapi32.RegOpenKeyExW
  //sys	RegCloseKey(key Handle) (regerrno error) = advapi32.RegCloseKey
  //sys	RegQueryInfoKey(key Handle, class *uint16, classLen *uint32, reserved *uint32, subkeysLen *uint32, maxSubkeyLen *uint32, maxClassLen *uint32, valuesLen *uint32, maxValueNameLen *uint32, maxValueLen *uint32, saLen *uint32, lastWriteTime *Filetime) (regerrno error) = advapi32.RegQueryInfoKeyW
  //sys	RegEnumKeyEx(key Handle, index uint32, name *uint16, nameLen *uint32, reserved *uint32, class *uint16, classLen *uint32, lastWriteTime *Filetime) (regerrno error) = advapi32.RegEnumKeyExW
  //sys	RegQueryValueEx(key Handle, name *uint16, reserved *uint32, valtype *uint32, buf *byte, buflen *uint32) (regerrno error) = advapi32.RegQueryValueExW
  //sys	getCurrentProcessId() (pid uint32) = kernel32.GetCurrentProcessId
  //sys	GetConsoleMode(console Handle, mode *uint32) (err error) = kernel32.GetConsoleMode
  //sys	WriteConsole(console Handle, buf *uint16, towrite uint32, written *uint32, reserved *byte) (err error) = kernel32.WriteConsoleW
  //sys	ReadConsole(console Handle, buf *uint16, toread uint32, read *uint32, inputControl *byte) (err error) = kernel32.ReadConsoleW
  //sys	CreateToolhelp32Snapshot(flags uint32, processId uint32) (handle Handle, err error) [failretval==InvalidHandle] = kernel32.CreateToolhelp32Snapshot
  //sys	Process32First(snapshot Handle, procEntry *ProcessEntry32) (err error) = kernel32.Process32FirstW
  //sys	Process32Next(snapshot Handle, procEntry *ProcessEntry32) (err error) = kernel32.Process32NextW
  //sys	DeviceIoControl(handle Handle, ioControlCode uint32, inBuffer *byte, inBufferSize uint32, outBuffer *byte, outBufferSize uint32, bytesReturned *uint32, overlapped *Overlapped) (err error)
  // This function returns 1 byte BOOLEAN rather than the 4 byte BOOL.
  //sys	CreateSymbolicLink(symlinkfilename *uint16, targetfilename *uint16, flags uint32) (err error) [failretval&0xff==0] = CreateSymbolicLinkW
  //sys	CreateHardLink(filename *uint16, existingfilename *uint16, reserved uintptr) (err error) [failretval&0xff==0] = CreateHardLinkW
  
  // syscall interface implementation for other packages
  
  // Implemented in ../runtime/syscall_windows.go.
  func Exit(code int)
  
  func makeInheritSa() *SecurityAttributes {
  	var sa SecurityAttributes
  	sa.Length = uint32(unsafe.Sizeof(sa))
  	sa.InheritHandle = 1
  	return &sa
  }
  
  func Open(path string, mode int, perm uint32) (fd Handle, err error) {
  	if len(path) == 0 {
  		return InvalidHandle, ERROR_FILE_NOT_FOUND
  	}
  	pathp, err := UTF16PtrFromString(path)
  	if err != nil {
  		return InvalidHandle, err
  	}
  	var access uint32
  	switch mode & (O_RDONLY | O_WRONLY | O_RDWR) {
  	case O_RDONLY:
  		access = GENERIC_READ
  	case O_WRONLY:
  		access = GENERIC_WRITE
  	case O_RDWR:
  		access = GENERIC_READ | GENERIC_WRITE
  	}
  	if mode&O_CREAT != 0 {
  		access |= GENERIC_WRITE
  	}
  	if mode&O_APPEND != 0 {
  		access &^= GENERIC_WRITE
  		access |= FILE_APPEND_DATA
  	}
  	sharemode := uint32(FILE_SHARE_READ | FILE_SHARE_WRITE)
  	var sa *SecurityAttributes
  	if mode&O_CLOEXEC == 0 {
  		sa = makeInheritSa()
  	}
  	var createmode uint32
  	switch {
  	case mode&(O_CREAT|O_EXCL) == (O_CREAT | O_EXCL):
  		createmode = CREATE_NEW
  	case mode&(O_CREAT|O_TRUNC) == (O_CREAT | O_TRUNC):
  		createmode = CREATE_ALWAYS
  	case mode&O_CREAT == O_CREAT:
  		createmode = OPEN_ALWAYS
  	case mode&O_TRUNC == O_TRUNC:
  		createmode = TRUNCATE_EXISTING
  	default:
  		createmode = OPEN_EXISTING
  	}
  	h, e := CreateFile(pathp, access, sharemode, sa, createmode, FILE_ATTRIBUTE_NORMAL, 0)
  	return h, e
  }
  
  func Read(fd Handle, p []byte) (n int, err error) {
  	var done uint32
  	e := ReadFile(fd, p, &done, nil)
  	if e != nil {
  		if e == ERROR_BROKEN_PIPE {
  			// NOTE(brainman): work around ERROR_BROKEN_PIPE is returned on reading EOF from stdin
  			return 0, nil
  		}
  		return 0, e
  	}
  	if race.Enabled {
  		if done > 0 {
  			race.WriteRange(unsafe.Pointer(&p[0]), int(done))
  		}
  		race.Acquire(unsafe.Pointer(&ioSync))
  	}
  	if msanenabled && done > 0 {
  		msanWrite(unsafe.Pointer(&p[0]), int(done))
  	}
  	return int(done), nil
  }
  
  func Write(fd Handle, p []byte) (n int, err error) {
  	if race.Enabled {
  		race.ReleaseMerge(unsafe.Pointer(&ioSync))
  	}
  	var done uint32
  	e := WriteFile(fd, p, &done, nil)
  	if e != nil {
  		return 0, e
  	}
  	if race.Enabled && done > 0 {
  		race.ReadRange(unsafe.Pointer(&p[0]), int(done))
  	}
  	if msanenabled && done > 0 {
  		msanRead(unsafe.Pointer(&p[0]), int(done))
  	}
  	return int(done), nil
  }
  
  var ioSync int64
  
  func Seek(fd Handle, offset int64, whence int) (newoffset int64, err error) {
  	var w uint32
  	switch whence {
  	case 0:
  		w = FILE_BEGIN
  	case 1:
  		w = FILE_CURRENT
  	case 2:
  		w = FILE_END
  	}
  	hi := int32(offset >> 32)
  	lo := int32(offset)
  	// use GetFileType to check pipe, pipe can't do seek
  	ft, _ := GetFileType(fd)
  	if ft == FILE_TYPE_PIPE {
  		return 0, ESPIPE
  	}
  	rlo, e := SetFilePointer(fd, lo, &hi, w)
  	if e != nil {
  		return 0, e
  	}
  	return int64(hi)<<32 + int64(rlo), nil
  }
  
  func Close(fd Handle) (err error) {
  	return CloseHandle(fd)
  }
  
  var (
  	Stdin  = getStdHandle(STD_INPUT_HANDLE)
  	Stdout = getStdHandle(STD_OUTPUT_HANDLE)
  	Stderr = getStdHandle(STD_ERROR_HANDLE)
  )
  
  func getStdHandle(h int) (fd Handle) {
  	r, _ := GetStdHandle(h)
  	CloseOnExec(r)
  	return r
  }
  
  const ImplementsGetwd = true
  
  func Getwd() (wd string, err error) {
  	b := make([]uint16, 300)
  	n, e := GetCurrentDirectory(uint32(len(b)), &b[0])
  	if e != nil {
  		return "", e
  	}
  	return string(utf16.Decode(b[0:n])), nil
  }
  
  func Chdir(path string) (err error) {
  	pathp, err := UTF16PtrFromString(path)
  	if err != nil {
  		return err
  	}
  	return SetCurrentDirectory(pathp)
  }
  
  func Mkdir(path string, mode uint32) (err error) {
  	pathp, err := UTF16PtrFromString(path)
  	if err != nil {
  		return err
  	}
  	return CreateDirectory(pathp, nil)
  }
  
  func Rmdir(path string) (err error) {
  	pathp, err := UTF16PtrFromString(path)
  	if err != nil {
  		return err
  	}
  	return RemoveDirectory(pathp)
  }
  
  func Unlink(path string) (err error) {
  	pathp, err := UTF16PtrFromString(path)
  	if err != nil {
  		return err
  	}
  	return DeleteFile(pathp)
  }
  
  func Rename(oldpath, newpath string) (err error) {
  	from, err := UTF16PtrFromString(oldpath)
  	if err != nil {
  		return err
  	}
  	to, err := UTF16PtrFromString(newpath)
  	if err != nil {
  		return err
  	}
  	return MoveFile(from, to)
  }
  
  func ComputerName() (name string, err error) {
  	var n uint32 = MAX_COMPUTERNAME_LENGTH + 1
  	b := make([]uint16, n)
  	e := GetComputerName(&b[0], &n)
  	if e != nil {
  		return "", e
  	}
  	return string(utf16.Decode(b[0:n])), nil
  }
  
  func Ftruncate(fd Handle, length int64) (err error) {
  	curoffset, e := Seek(fd, 0, 1)
  	if e != nil {
  		return e
  	}
  	defer Seek(fd, curoffset, 0)
  	_, e = Seek(fd, length, 0)
  	if e != nil {
  		return e
  	}
  	e = SetEndOfFile(fd)
  	if e != nil {
  		return e
  	}
  	return nil
  }
  
  func Gettimeofday(tv *Timeval) (err error) {
  	var ft Filetime
  	GetSystemTimeAsFileTime(&ft)
  	*tv = NsecToTimeval(ft.Nanoseconds())
  	return nil
  }
  
  func Pipe(p []Handle) (err error) {
  	if len(p) != 2 {
  		return EINVAL
  	}
  	var r, w Handle
  	e := CreatePipe(&r, &w, makeInheritSa(), 0)
  	if e != nil {
  		return e
  	}
  	p[0] = r
  	p[1] = w
  	return nil
  }
  
  func Utimes(path string, tv []Timeval) (err error) {
  	if len(tv) != 2 {
  		return EINVAL
  	}
  	pathp, e := UTF16PtrFromString(path)
  	if e != nil {
  		return e
  	}
  	h, e := CreateFile(pathp,
  		FILE_WRITE_ATTRIBUTES, FILE_SHARE_WRITE, nil,
  		OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0)
  	if e != nil {
  		return e
  	}
  	defer Close(h)
  	a := NsecToFiletime(tv[0].Nanoseconds())
  	w := NsecToFiletime(tv[1].Nanoseconds())
  	return SetFileTime(h, nil, &a, &w)
  }
  
  func UtimesNano(path string, ts []Timespec) (err error) {
  	if len(ts) != 2 {
  		return EINVAL
  	}
  	pathp, e := UTF16PtrFromString(path)
  	if e != nil {
  		return e
  	}
  	h, e := CreateFile(pathp,
  		FILE_WRITE_ATTRIBUTES, FILE_SHARE_WRITE, nil,
  		OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0)
  	if e != nil {
  		return e
  	}
  	defer Close(h)
  	a := NsecToFiletime(TimespecToNsec(ts[0]))
  	w := NsecToFiletime(TimespecToNsec(ts[1]))
  	return SetFileTime(h, nil, &a, &w)
  }
  
  func Fsync(fd Handle) (err error) {
  	return FlushFileBuffers(fd)
  }
  
  func Chmod(path string, mode uint32) (err error) {
  	if mode == 0 {
  		return EINVAL
  	}
  	p, e := UTF16PtrFromString(path)
  	if e != nil {
  		return e
  	}
  	attrs, e := GetFileAttributes(p)
  	if e != nil {
  		return e
  	}
  	if mode&S_IWRITE != 0 {
  		attrs &^= FILE_ATTRIBUTE_READONLY
  	} else {
  		attrs |= FILE_ATTRIBUTE_READONLY
  	}
  	return SetFileAttributes(p, attrs)
  }
  
  func LoadCancelIoEx() error {
  	return procCancelIoEx.Find()
  }
  
  func LoadSetFileCompletionNotificationModes() error {
  	return procSetFileCompletionNotificationModes.Find()
  }
  
  // net api calls
  
  const socket_error = uintptr(^uint32(0))
  
  //sys	WSAStartup(verreq uint32, data *WSAData) (sockerr error) = ws2_32.WSAStartup
  //sys	WSACleanup() (err error) [failretval==socket_error] = ws2_32.WSACleanup
  //sys	WSAIoctl(s Handle, iocc uint32, inbuf *byte, cbif uint32, outbuf *byte, cbob uint32, cbbr *uint32, overlapped *Overlapped, completionRoutine uintptr) (err error) [failretval==socket_error] = ws2_32.WSAIoctl
  //sys	socket(af int32, typ int32, protocol int32) (handle Handle, err error) [failretval==InvalidHandle] = ws2_32.socket
  //sys	Setsockopt(s Handle, level int32, optname int32, optval *byte, optlen int32) (err error) [failretval==socket_error] = ws2_32.setsockopt
  //sys	Getsockopt(s Handle, level int32, optname int32, optval *byte, optlen *int32) (err error) [failretval==socket_error] = ws2_32.getsockopt
  //sys	bind(s Handle, name unsafe.Pointer, namelen int32) (err error) [failretval==socket_error] = ws2_32.bind
  //sys	connect(s Handle, name unsafe.Pointer, namelen int32) (err error) [failretval==socket_error] = ws2_32.connect
  //sys	getsockname(s Handle, rsa *RawSockaddrAny, addrlen *int32) (err error) [failretval==socket_error] = ws2_32.getsockname
  //sys	getpeername(s Handle, rsa *RawSockaddrAny, addrlen *int32) (err error) [failretval==socket_error] = ws2_32.getpeername
  //sys	listen(s Handle, backlog int32) (err error) [failretval==socket_error] = ws2_32.listen
  //sys	shutdown(s Handle, how int32) (err error) [failretval==socket_error] = ws2_32.shutdown
  //sys	Closesocket(s Handle) (err error) [failretval==socket_error] = ws2_32.closesocket
  //sys	AcceptEx(ls Handle, as Handle, buf *byte, rxdatalen uint32, laddrlen uint32, raddrlen uint32, recvd *uint32, overlapped *Overlapped) (err error) = mswsock.AcceptEx
  //sys	GetAcceptExSockaddrs(buf *byte, rxdatalen uint32, laddrlen uint32, raddrlen uint32, lrsa **RawSockaddrAny, lrsalen *int32, rrsa **RawSockaddrAny, rrsalen *int32) = mswsock.GetAcceptExSockaddrs
  //sys	WSARecv(s Handle, bufs *WSABuf, bufcnt uint32, recvd *uint32, flags *uint32, overlapped *Overlapped, croutine *byte) (err error) [failretval==socket_error] = ws2_32.WSARecv
  //sys	WSASend(s Handle, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, overlapped *Overlapped, croutine *byte) (err error) [failretval==socket_error] = ws2_32.WSASend
  //sys	WSARecvFrom(s Handle, bufs *WSABuf, bufcnt uint32, recvd *uint32, flags *uint32,  from *RawSockaddrAny, fromlen *int32, overlapped *Overlapped, croutine *byte) (err error) [failretval==socket_error] = ws2_32.WSARecvFrom
  //sys	WSASendTo(s Handle, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, to *RawSockaddrAny, tolen int32,  overlapped *Overlapped, croutine *byte) (err error) [failretval==socket_error] = ws2_32.WSASendTo
  //sys	GetHostByName(name string) (h *Hostent, err error) [failretval==nil] = ws2_32.gethostbyname
  //sys	GetServByName(name string, proto string) (s *Servent, err error) [failretval==nil] = ws2_32.getservbyname
  //sys	Ntohs(netshort uint16) (u uint16) = ws2_32.ntohs
  //sys	GetProtoByName(name string) (p *Protoent, err error) [failretval==nil] = ws2_32.getprotobyname
  //sys	DnsQuery(name string, qtype uint16, options uint32, extra *byte, qrs **DNSRecord, pr *byte) (status error) = dnsapi.DnsQuery_W
  //sys	DnsRecordListFree(rl *DNSRecord, freetype uint32) = dnsapi.DnsRecordListFree
  //sys	DnsNameCompare(name1 *uint16, name2 *uint16) (same bool) = dnsapi.DnsNameCompare_W
  //sys	GetAddrInfoW(nodename *uint16, servicename *uint16, hints *AddrinfoW, result **AddrinfoW) (sockerr error) = ws2_32.GetAddrInfoW
  //sys	FreeAddrInfoW(addrinfo *AddrinfoW) = ws2_32.FreeAddrInfoW
  //sys	GetIfEntry(pIfRow *MibIfRow) (errcode error) = iphlpapi.GetIfEntry
  //sys	GetAdaptersInfo(ai *IpAdapterInfo, ol *uint32) (errcode error) = iphlpapi.GetAdaptersInfo
  //sys	SetFileCompletionNotificationModes(handle Handle, flags uint8) (err error) = kernel32.SetFileCompletionNotificationModes
  //sys	WSAEnumProtocols(protocols *int32, protocolBuffer *WSAProtocolInfo, bufferLength *uint32) (n int32, err error) [failretval==-1] = ws2_32.WSAEnumProtocolsW
  
  // For testing: clients can set this flag to force
  // creation of IPv6 sockets to return EAFNOSUPPORT.
  var SocketDisableIPv6 bool
  
  type RawSockaddrInet4 struct {
  	Family uint16
  	Port   uint16
  	Addr   [4]byte /* in_addr */
  	Zero   [8]uint8
  }
  
  type RawSockaddrInet6 struct {
  	Family   uint16
  	Port     uint16
  	Flowinfo uint32
  	Addr     [16]byte /* in6_addr */
  	Scope_id uint32
  }
  
  type RawSockaddr struct {
  	Family uint16
  	Data   [14]int8
  }
  
  type RawSockaddrAny struct {
  	Addr RawSockaddr
  	Pad  [96]int8
  }
  
  type Sockaddr interface {
  	sockaddr() (ptr unsafe.Pointer, len int32, err error) // lowercase; only we can define Sockaddrs
  }
  
  type SockaddrInet4 struct {
  	Port int
  	Addr [4]byte
  	raw  RawSockaddrInet4
  }
  
  func (sa *SockaddrInet4) sockaddr() (unsafe.Pointer, int32, error) {
  	if sa.Port < 0 || sa.Port > 0xFFFF {
  		return nil, 0, EINVAL
  	}
  	sa.raw.Family = AF_INET
  	p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
  	p[0] = byte(sa.Port >> 8)
  	p[1] = byte(sa.Port)
  	for i := 0; i < len(sa.Addr); i++ {
  		sa.raw.Addr[i] = sa.Addr[i]
  	}
  	return unsafe.Pointer(&sa.raw), int32(unsafe.Sizeof(sa.raw)), nil
  }
  
  type SockaddrInet6 struct {
  	Port   int
  	ZoneId uint32
  	Addr   [16]byte
  	raw    RawSockaddrInet6
  }
  
  func (sa *SockaddrInet6) sockaddr() (unsafe.Pointer, int32, error) {
  	if sa.Port < 0 || sa.Port > 0xFFFF {
  		return nil, 0, EINVAL
  	}
  	sa.raw.Family = AF_INET6
  	p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
  	p[0] = byte(sa.Port >> 8)
  	p[1] = byte(sa.Port)
  	sa.raw.Scope_id = sa.ZoneId
  	for i := 0; i < len(sa.Addr); i++ {
  		sa.raw.Addr[i] = sa.Addr[i]
  	}
  	return unsafe.Pointer(&sa.raw), int32(unsafe.Sizeof(sa.raw)), nil
  }
  
  type SockaddrUnix struct {
  	Name string
  }
  
  func (sa *SockaddrUnix) sockaddr() (unsafe.Pointer, int32, error) {
  	// TODO(brainman): implement SockaddrUnix.sockaddr()
  	return nil, 0, EWINDOWS
  }
  
  func (rsa *RawSockaddrAny) Sockaddr() (Sockaddr, error) {
  	switch rsa.Addr.Family {
  	case AF_UNIX:
  		return nil, EWINDOWS
  
  	case AF_INET:
  		pp := (*RawSockaddrInet4)(unsafe.Pointer(rsa))
  		sa := new(SockaddrInet4)
  		p := (*[2]byte)(unsafe.Pointer(&pp.Port))
  		sa.Port = int(p[0])<<8 + int(p[1])
  		for i := 0; i < len(sa.Addr); i++ {
  			sa.Addr[i] = pp.Addr[i]
  		}
  		return sa, nil
  
  	case AF_INET6:
  		pp := (*RawSockaddrInet6)(unsafe.Pointer(rsa))
  		sa := new(SockaddrInet6)
  		p := (*[2]byte)(unsafe.Pointer(&pp.Port))
  		sa.Port = int(p[0])<<8 + int(p[1])
  		sa.ZoneId = pp.Scope_id
  		for i := 0; i < len(sa.Addr); i++ {
  			sa.Addr[i] = pp.Addr[i]
  		}
  		return sa, nil
  	}
  	return nil, EAFNOSUPPORT
  }
  
  func Socket(domain, typ, proto int) (fd Handle, err error) {
  	if domain == AF_INET6 && SocketDisableIPv6 {
  		return InvalidHandle, EAFNOSUPPORT
  	}
  	return socket(int32(domain), int32(typ), int32(proto))
  }
  
  func SetsockoptInt(fd Handle, level, opt int, value int) (err error) {
  	v := int32(value)
  	return Setsockopt(fd, int32(level), int32(opt), (*byte)(unsafe.Pointer(&v)), int32(unsafe.Sizeof(v)))
  }
  
  func Bind(fd Handle, sa Sockaddr) (err error) {
  	ptr, n, err := sa.sockaddr()
  	if err != nil {
  		return err
  	}
  	return bind(fd, ptr, n)
  }
  
  func Connect(fd Handle, sa Sockaddr) (err error) {
  	ptr, n, err := sa.sockaddr()
  	if err != nil {
  		return err
  	}
  	return connect(fd, ptr, n)
  }
  
  func Getsockname(fd Handle) (sa Sockaddr, err error) {
  	var rsa RawSockaddrAny
  	l := int32(unsafe.Sizeof(rsa))
  	if err = getsockname(fd, &rsa, &l); err != nil {
  		return
  	}
  	return rsa.Sockaddr()
  }
  
  func Getpeername(fd Handle) (sa Sockaddr, err error) {
  	var rsa RawSockaddrAny
  	l := int32(unsafe.Sizeof(rsa))
  	if err = getpeername(fd, &rsa, &l); err != nil {
  		return
  	}
  	return rsa.Sockaddr()
  }
  
  func Listen(s Handle, n int) (err error) {
  	return listen(s, int32(n))
  }
  
  func Shutdown(fd Handle, how int) (err error) {
  	return shutdown(fd, int32(how))
  }
  
  func WSASendto(s Handle, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, to Sockaddr, overlapped *Overlapped, croutine *byte) (err error) {
  	rsa, l, err := to.sockaddr()
  	if err != nil {
  		return err
  	}
  	return WSASendTo(s, bufs, bufcnt, sent, flags, (*RawSockaddrAny)(unsafe.Pointer(rsa)), l, overlapped, croutine)
  }
  
  func LoadGetAddrInfo() error {
  	return procGetAddrInfoW.Find()
  }
  
  var connectExFunc struct {
  	once sync.Once
  	addr uintptr
  	err  error
  }
  
  func LoadConnectEx() error {
  	connectExFunc.once.Do(func() {
  		var s Handle
  		s, connectExFunc.err = Socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)
  		if connectExFunc.err != nil {
  			return
  		}
  		defer CloseHandle(s)
  		var n uint32
  		connectExFunc.err = WSAIoctl(s,
  			SIO_GET_EXTENSION_FUNCTION_POINTER,
  			(*byte)(unsafe.Pointer(&WSAID_CONNECTEX)),
  			uint32(unsafe.Sizeof(WSAID_CONNECTEX)),
  			(*byte)(unsafe.Pointer(&connectExFunc.addr)),
  			uint32(unsafe.Sizeof(connectExFunc.addr)),
  			&n, nil, 0)
  	})
  	return connectExFunc.err
  }
  
  func connectEx(s Handle, name unsafe.Pointer, namelen int32, sendBuf *byte, sendDataLen uint32, bytesSent *uint32, overlapped *Overlapped) (err error) {
  	r1, _, e1 := Syscall9(connectExFunc.addr, 7, uintptr(s), uintptr(name), uintptr(namelen), uintptr(unsafe.Pointer(sendBuf)), uintptr(sendDataLen), uintptr(unsafe.Pointer(bytesSent)), uintptr(unsafe.Pointer(overlapped)), 0, 0)
  	if r1 == 0 {
  		if e1 != 0 {
  			err = error(e1)
  		} else {
  			err = EINVAL
  		}
  	}
  	return
  }
  
  func ConnectEx(fd Handle, sa Sockaddr, sendBuf *byte, sendDataLen uint32, bytesSent *uint32, overlapped *Overlapped) error {
  	err := LoadConnectEx()
  	if err != nil {
  		return errorspkg.New("failed to find ConnectEx: " + err.Error())
  	}
  	ptr, n, err := sa.sockaddr()
  	if err != nil {
  		return err
  	}
  	return connectEx(fd, ptr, n, sendBuf, sendDataLen, bytesSent, overlapped)
  }
  
  // Invented structures to support what package os expects.
  type Rusage struct {
  	CreationTime Filetime
  	ExitTime     Filetime
  	KernelTime   Filetime
  	UserTime     Filetime
  }
  
  type WaitStatus struct {
  	ExitCode uint32
  }
  
  func (w WaitStatus) Exited() bool { return true }
  
  func (w WaitStatus) ExitStatus() int { return int(w.ExitCode) }
  
  func (w WaitStatus) Signal() Signal { return -1 }
  
  func (w WaitStatus) CoreDump() bool { return false }
  
  func (w WaitStatus) Stopped() bool { return false }
  
  func (w WaitStatus) Continued() bool { return false }
  
  func (w WaitStatus) StopSignal() Signal { return -1 }
  
  func (w WaitStatus) Signaled() bool { return false }
  
  func (w WaitStatus) TrapCause() int { return -1 }
  
  // Timespec is an invented structure on Windows, but here for
  // consistency with the syscall package for other operating systems.
  type Timespec struct {
  	Sec  int64
  	Nsec int64
  }
  
  func TimespecToNsec(ts Timespec) int64 { return int64(ts.Sec)*1e9 + int64(ts.Nsec) }
  
  func NsecToTimespec(nsec int64) (ts Timespec) {
  	ts.Sec = nsec / 1e9
  	ts.Nsec = nsec % 1e9
  	return
  }
  
  // TODO(brainman): fix all needed for net
  
  func Accept(fd Handle) (nfd Handle, sa Sockaddr, err error) { return 0, nil, EWINDOWS }
  func Recvfrom(fd Handle, p []byte, flags int) (n int, from Sockaddr, err error) {
  	return 0, nil, EWINDOWS
  }
  func Sendto(fd Handle, p []byte, flags int, to Sockaddr) (err error)       { return EWINDOWS }
  func SetsockoptTimeval(fd Handle, level, opt int, tv *Timeval) (err error) { return EWINDOWS }
  
  // The Linger struct is wrong but we only noticed after Go 1.
  // sysLinger is the real system call structure.
  
  // BUG(brainman): The definition of Linger is not appropriate for direct use
  // with Setsockopt and Getsockopt.
  // Use SetsockoptLinger instead.
  
  type Linger struct {
  	Onoff  int32
  	Linger int32
  }
  
  type sysLinger struct {
  	Onoff  uint16
  	Linger uint16
  }
  
  type IPMreq struct {
  	Multiaddr [4]byte /* in_addr */
  	Interface [4]byte /* in_addr */
  }
  
  type IPv6Mreq struct {
  	Multiaddr [16]byte /* in6_addr */
  	Interface uint32
  }
  
  func GetsockoptInt(fd Handle, level, opt int) (int, error) { return -1, EWINDOWS }
  
  func SetsockoptLinger(fd Handle, level, opt int, l *Linger) (err error) {
  	sys := sysLinger{Onoff: uint16(l.Onoff), Linger: uint16(l.Linger)}
  	return Setsockopt(fd, int32(level), int32(opt), (*byte)(unsafe.Pointer(&sys)), int32(unsafe.Sizeof(sys)))
  }
  
  func SetsockoptInet4Addr(fd Handle, level, opt int, value [4]byte) (err error) {
  	return Setsockopt(fd, int32(level), int32(opt), (*byte)(unsafe.Pointer(&value[0])), 4)
  }
  func SetsockoptIPMreq(fd Handle, level, opt int, mreq *IPMreq) (err error) {
  	return Setsockopt(fd, int32(level), int32(opt), (*byte)(unsafe.Pointer(mreq)), int32(unsafe.Sizeof(*mreq)))
  }
  func SetsockoptIPv6Mreq(fd Handle, level, opt int, mreq *IPv6Mreq) (err error) { return EWINDOWS }
  
  func Getpid() (pid int) { return int(getCurrentProcessId()) }
  
  func FindFirstFile(name *uint16, data *Win32finddata) (handle Handle, err error) {
  	// NOTE(rsc): The Win32finddata struct is wrong for the system call:
  	// the two paths are each one uint16 short. Use the correct struct,
  	// a win32finddata1, and then copy the results out.
  	// There is no loss of expressivity here, because the final
  	// uint16, if it is used, is supposed to be a NUL, and Go doesn't need that.
  	// For Go 1.1, we might avoid the allocation of win32finddata1 here
  	// by adding a final Bug [2]uint16 field to the struct and then
  	// adjusting the fields in the result directly.
  	var data1 win32finddata1
  	handle, err = findFirstFile1(name, &data1)
  	if err == nil {
  		copyFindData(data, &data1)
  	}
  	return
  }
  
  func FindNextFile(handle Handle, data *Win32finddata) (err error) {
  	var data1 win32finddata1
  	err = findNextFile1(handle, &data1)
  	if err == nil {
  		copyFindData(data, &data1)
  	}
  	return
  }
  
  func getProcessEntry(pid int) (*ProcessEntry32, error) {
  	snapshot, err := CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0)
  	if err != nil {
  		return nil, err
  	}
  	defer CloseHandle(snapshot)
  	var procEntry ProcessEntry32
  	procEntry.Size = uint32(unsafe.Sizeof(procEntry))
  	if err = Process32First(snapshot, &procEntry); err != nil {
  		return nil, err
  	}
  	for {
  		if procEntry.ProcessID == uint32(pid) {
  			return &procEntry, nil
  		}
  		err = Process32Next(snapshot, &procEntry)
  		if err != nil {
  			return nil, err
  		}
  	}
  }
  
  func Getppid() (ppid int) {
  	pe, err := getProcessEntry(Getpid())
  	if err != nil {
  		return -1
  	}
  	return int(pe.ParentProcessID)
  }
  
  // TODO(brainman): fix all needed for os
  func Fchdir(fd Handle) (err error)             { return EWINDOWS }
  func Link(oldpath, newpath string) (err error) { return EWINDOWS }
  func Symlink(path, link string) (err error)    { return EWINDOWS }
  
  func Fchmod(fd Handle, mode uint32) (err error)        { return EWINDOWS }
  func Chown(path string, uid int, gid int) (err error)  { return EWINDOWS }
  func Lchown(path string, uid int, gid int) (err error) { return EWINDOWS }
  func Fchown(fd Handle, uid int, gid int) (err error)   { return EWINDOWS }
  
  func Getuid() (uid int)                  { return -1 }
  func Geteuid() (euid int)                { return -1 }
  func Getgid() (gid int)                  { return -1 }
  func Getegid() (egid int)                { return -1 }
  func Getgroups() (gids []int, err error) { return nil, EWINDOWS }
  
  type Signal int
  
  func (s Signal) Signal() {}
  
  func (s Signal) String() string {
  	if 0 <= s && int(s) < len(signals) {
  		str := signals[s]
  		if str != "" {
  			return str
  		}
  	}
  	return "signal " + itoa(int(s))
  }
  
  func LoadCreateSymbolicLink() error {
  	return procCreateSymbolicLinkW.Find()
  }
  
  // Readlink returns the destination of the named symbolic link.
  func Readlink(path string, buf []byte) (n int, err error) {
  	fd, err := CreateFile(StringToUTF16Ptr(path), GENERIC_READ, 0, nil, OPEN_EXISTING,
  		FILE_FLAG_OPEN_REPARSE_POINT|FILE_FLAG_BACKUP_SEMANTICS, 0)
  	if err != nil {
  		return -1, err
  	}
  	defer CloseHandle(fd)
  
  	rdbbuf := make([]byte, MAXIMUM_REPARSE_DATA_BUFFER_SIZE)
  	var bytesReturned uint32
  	err = DeviceIoControl(fd, FSCTL_GET_REPARSE_POINT, nil, 0, &rdbbuf[0], uint32(len(rdbbuf)), &bytesReturned, nil)
  	if err != nil {
  		return -1, err
  	}
  
  	rdb := (*reparseDataBuffer)(unsafe.Pointer(&rdbbuf[0]))
  	var s string
  	switch rdb.ReparseTag {
  	case IO_REPARSE_TAG_SYMLINK:
  		data := (*symbolicLinkReparseBuffer)(unsafe.Pointer(&rdb.reparseBuffer))
  		p := (*[0xffff]uint16)(unsafe.Pointer(&data.PathBuffer[0]))
  		s = UTF16ToString(p[data.SubstituteNameOffset/2 : (data.SubstituteNameOffset+data.SubstituteNameLength)/2])
  		if data.Flags&_SYMLINK_FLAG_RELATIVE == 0 {
  			if len(s) >= 4 && s[:4] == `\??\` {
  				s = s[4:]
  				switch {
  				case len(s) >= 2 && s[1] == ':': // \??\C:\foo\bar
  					// do nothing
  				case len(s) >= 4 && s[:4] == `UNC\`: // \??\UNC\foo\bar
  					s = `\\` + s[4:]
  				default:
  					// unexpected; do nothing
  				}
  			} else {
  				// unexpected; do nothing
  			}
  		}
  	case _IO_REPARSE_TAG_MOUNT_POINT:
  		data := (*mountPointReparseBuffer)(unsafe.Pointer(&rdb.reparseBuffer))
  		p := (*[0xffff]uint16)(unsafe.Pointer(&data.PathBuffer[0]))
  		s = UTF16ToString(p[data.SubstituteNameOffset/2 : (data.SubstituteNameOffset+data.SubstituteNameLength)/2])
  		if len(s) >= 4 && s[:4] == `\??\` { // \??\C:\foo\bar
  			s = s[4:]
  		} else {
  			// unexpected; do nothing
  		}
  	default:
  		// the path is not a symlink or junction but another type of reparse
  		// point
  		return -1, ENOENT
  	}
  	n = copy(buf, []byte(s))
  
  	return n, nil
  }
  

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