Source file src/syscall/syscall_windows.go

     1  // Copyright 2009 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // Windows system calls.
     6  
     7  package syscall
     8  
     9  import (
    10  	errorspkg "errors"
    11  	"internal/asan"
    12  	"internal/bytealg"
    13  	"internal/itoa"
    14  	"internal/msan"
    15  	"internal/oserror"
    16  	"internal/race"
    17  	"runtime"
    18  	"sync"
    19  	"unsafe"
    20  )
    21  
    22  type Handle uintptr
    23  
    24  const InvalidHandle = ^Handle(0)
    25  
    26  // StringToUTF16 returns the UTF-16 encoding of the UTF-8 string s,
    27  // with a terminating NUL added. If s contains a NUL byte this
    28  // function panics instead of returning an error.
    29  //
    30  // Deprecated: Use [UTF16FromString] instead.
    31  func StringToUTF16(s string) []uint16 {
    32  	a, err := UTF16FromString(s)
    33  	if err != nil {
    34  		panic("syscall: string with NUL passed to StringToUTF16")
    35  	}
    36  	return a
    37  }
    38  
    39  // UTF16FromString returns the UTF-16 encoding of the UTF-8 string
    40  // s, with a terminating NUL added. If s contains a NUL byte at any
    41  // location, it returns (nil, [EINVAL]). Unpaired surrogates
    42  // are encoded using WTF-8.
    43  func UTF16FromString(s string) ([]uint16, error) {
    44  	if bytealg.IndexByteString(s, 0) != -1 {
    45  		return nil, EINVAL
    46  	}
    47  	// Valid UTF-8 characters between 1 and 3 bytes require one uint16.
    48  	// Valid UTF-8 characters of 4 bytes require two uint16.
    49  	// Bytes with invalid UTF-8 encoding require maximum one uint16 per byte.
    50  	// So the number of UTF-8 code units (len(s)) is always greater or
    51  	// equal than the number of UTF-16 code units.
    52  	// Also account for the terminating NUL character.
    53  	buf := make([]uint16, 0, len(s)+1)
    54  	buf = encodeWTF16(s, buf)
    55  	return append(buf, 0), nil
    56  }
    57  
    58  // UTF16ToString returns the UTF-8 encoding of the UTF-16 sequence s,
    59  // with a terminating NUL removed. Unpaired surrogates are decoded
    60  // using WTF-8 instead of UTF-8 encoding.
    61  func UTF16ToString(s []uint16) string {
    62  	maxLen := 0
    63  	for i, v := range s {
    64  		if v == 0 {
    65  			s = s[0:i]
    66  			break
    67  		}
    68  		switch {
    69  		case v <= rune1Max:
    70  			maxLen += 1
    71  		case v <= rune2Max:
    72  			maxLen += 2
    73  		default:
    74  			// r is a non-surrogate that decodes to 3 bytes,
    75  			// or is an unpaired surrogate (also 3 bytes in WTF-8),
    76  			// or is one half of a valid surrogate pair.
    77  			// If it is half of a pair, we will add 3 for the second surrogate
    78  			// (total of 6) and overestimate by 2 bytes for the pair,
    79  			// since the resulting rune only requires 4 bytes.
    80  			maxLen += 3
    81  		}
    82  	}
    83  	buf := decodeWTF16(s, make([]byte, 0, maxLen))
    84  	return unsafe.String(unsafe.SliceData(buf), len(buf))
    85  }
    86  
    87  // utf16PtrToString is like UTF16ToString, but takes *uint16
    88  // as a parameter instead of []uint16.
    89  func utf16PtrToString(p *uint16) string {
    90  	if p == nil {
    91  		return ""
    92  	}
    93  	end := unsafe.Pointer(p)
    94  	n := 0
    95  	for *(*uint16)(end) != 0 {
    96  		end = unsafe.Pointer(uintptr(end) + unsafe.Sizeof(*p))
    97  		n++
    98  	}
    99  	return UTF16ToString(unsafe.Slice(p, n))
   100  }
   101  
   102  // StringToUTF16Ptr returns pointer to the UTF-16 encoding of
   103  // the UTF-8 string s, with a terminating NUL added. If s
   104  // contains a NUL byte this function panics instead of
   105  // returning an error.
   106  //
   107  // Deprecated: Use [UTF16PtrFromString] instead.
   108  func StringToUTF16Ptr(s string) *uint16 { return &StringToUTF16(s)[0] }
   109  
   110  // UTF16PtrFromString returns pointer to the UTF-16 encoding of
   111  // the UTF-8 string s, with a terminating NUL added. If s
   112  // contains a NUL byte at any location, it returns (nil, EINVAL).
   113  // Unpaired surrogates are encoded using WTF-8.
   114  func UTF16PtrFromString(s string) (*uint16, error) {
   115  	a, err := UTF16FromString(s)
   116  	if err != nil {
   117  		return nil, err
   118  	}
   119  	return &a[0], nil
   120  }
   121  
   122  // Errno is the Windows error number.
   123  //
   124  // Errno values can be tested against error values using [errors.Is].
   125  // For example:
   126  //
   127  //	_, _, err := syscall.Syscall(...)
   128  //	if errors.Is(err, fs.ErrNotExist) ...
   129  type Errno uintptr
   130  
   131  func langid(pri, sub uint16) uint32 { return uint32(sub)<<10 | uint32(pri) }
   132  
   133  // FormatMessage is deprecated (msgsrc should be uintptr, not uint32, but can
   134  // not be changed due to the Go 1 compatibility guarantee).
   135  //
   136  // Deprecated: Use FormatMessage from golang.org/x/sys/windows instead.
   137  func FormatMessage(flags uint32, msgsrc uint32, msgid uint32, langid uint32, buf []uint16, args *byte) (n uint32, err error) {
   138  	return formatMessage(flags, uintptr(msgsrc), msgid, langid, buf, args)
   139  }
   140  
   141  func (e Errno) Error() string {
   142  	// deal with special go errors
   143  	idx := int(e - APPLICATION_ERROR)
   144  	if 0 <= idx && idx < len(errors) {
   145  		return errors[idx]
   146  	}
   147  	// ask windows for the remaining errors
   148  	var flags uint32 = FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ARGUMENT_ARRAY | FORMAT_MESSAGE_IGNORE_INSERTS
   149  	b := make([]uint16, 300)
   150  	n, err := formatMessage(flags, 0, uint32(e), langid(LANG_ENGLISH, SUBLANG_ENGLISH_US), b, nil)
   151  	if err != nil {
   152  		n, err = formatMessage(flags, 0, uint32(e), 0, b, nil)
   153  		if err != nil {
   154  			return "winapi error #" + itoa.Itoa(int(e))
   155  		}
   156  	}
   157  	// trim terminating \r and \n
   158  	for ; n > 0 && (b[n-1] == '\n' || b[n-1] == '\r'); n-- {
   159  	}
   160  	return UTF16ToString(b[:n])
   161  }
   162  
   163  const (
   164  	_ERROR_NOT_ENOUGH_MEMORY    = Errno(8)
   165  	_ERROR_NOT_SUPPORTED        = Errno(50)
   166  	_ERROR_BAD_NETPATH          = Errno(53)
   167  	_ERROR_CALL_NOT_IMPLEMENTED = Errno(120)
   168  )
   169  
   170  func (e Errno) Is(target error) bool {
   171  	switch target {
   172  	case oserror.ErrPermission:
   173  		return e == ERROR_ACCESS_DENIED ||
   174  			e == EACCES ||
   175  			e == EPERM
   176  	case oserror.ErrExist:
   177  		return e == ERROR_ALREADY_EXISTS ||
   178  			e == ERROR_DIR_NOT_EMPTY ||
   179  			e == ERROR_FILE_EXISTS ||
   180  			e == EEXIST ||
   181  			e == ENOTEMPTY
   182  	case oserror.ErrNotExist:
   183  		return e == ERROR_FILE_NOT_FOUND ||
   184  			e == _ERROR_BAD_NETPATH ||
   185  			e == ERROR_PATH_NOT_FOUND ||
   186  			e == ENOENT
   187  	case errorspkg.ErrUnsupported:
   188  		return e == _ERROR_NOT_SUPPORTED ||
   189  			e == _ERROR_CALL_NOT_IMPLEMENTED ||
   190  			e == ENOSYS ||
   191  			e == ENOTSUP ||
   192  			e == EOPNOTSUPP ||
   193  			e == EWINDOWS
   194  	}
   195  	return false
   196  }
   197  
   198  func (e Errno) Temporary() bool {
   199  	return e == EINTR || e == EMFILE || e.Timeout()
   200  }
   201  
   202  func (e Errno) Timeout() bool {
   203  	return e == EAGAIN || e == EWOULDBLOCK || e == ETIMEDOUT
   204  }
   205  
   206  // Implemented in runtime/syscall_windows.go.
   207  func compileCallback(fn any, cleanstack bool) uintptr
   208  
   209  // NewCallback converts a Go function to a function pointer conforming to the stdcall calling convention.
   210  // This is useful when interoperating with Windows code requiring callbacks.
   211  // The argument is expected to be a function with one uintptr-sized result. The function must not have arguments with size larger than the size of uintptr.
   212  // Only a limited number of callbacks may be created in a single Go process, and any memory allocated
   213  // for these callbacks is never released.
   214  // Between NewCallback and NewCallbackCDecl, at least 1024 callbacks can always be created.
   215  func NewCallback(fn any) uintptr {
   216  	return compileCallback(fn, true)
   217  }
   218  
   219  // NewCallbackCDecl converts a Go function to a function pointer conforming to the cdecl calling convention.
   220  // This is useful when interoperating with Windows code requiring callbacks.
   221  // The argument is expected to be a function with one uintptr-sized result. The function must not have arguments with size larger than the size of uintptr.
   222  // Only a limited number of callbacks may be created in a single Go process, and any memory allocated
   223  // for these callbacks is never released.
   224  // Between NewCallback and NewCallbackCDecl, at least 1024 callbacks can always be created.
   225  func NewCallbackCDecl(fn any) uintptr {
   226  	return compileCallback(fn, false)
   227  }
   228  
   229  // windows api calls
   230  
   231  //sys	GetLastError() (lasterr error)
   232  //sys	LoadLibrary(libname string) (handle Handle, err error) = LoadLibraryW
   233  //sys	FreeLibrary(handle Handle) (err error)
   234  //sys	GetProcAddress(module Handle, procname string) (proc uintptr, err error)
   235  //sys	GetVersion() (ver uint32, err error)
   236  //sys	formatMessage(flags uint32, msgsrc uintptr, msgid uint32, langid uint32, buf []uint16, args *byte) (n uint32, err error) = FormatMessageW
   237  //sys	ExitProcess(exitcode uint32)
   238  //sys	createFile(name *uint16, access uint32, mode uint32, sa *SecurityAttributes, createmode uint32, attrs uint32, templatefile int32) (handle Handle, err error) [failretval == InvalidHandle || e1 == ERROR_ALREADY_EXISTS ] = CreateFileW
   239  //sys	readFile(handle Handle, buf []byte, done *uint32, overlapped *Overlapped) (err error) = ReadFile
   240  //sys	writeFile(handle Handle, buf []byte, done *uint32, overlapped *Overlapped) (err error) = WriteFile
   241  //sys	SetFilePointer(handle Handle, lowoffset int32, highoffsetptr *int32, whence uint32) (newlowoffset uint32, err error) [failretval==0xffffffff]
   242  //sys	CloseHandle(handle Handle) (err error)
   243  //sys	GetStdHandle(stdhandle int) (handle Handle, err error) [failretval==InvalidHandle]
   244  //sys	findFirstFile1(name *uint16, data *win32finddata1) (handle Handle, err error) [failretval==InvalidHandle] = FindFirstFileW
   245  //sys	findNextFile1(handle Handle, data *win32finddata1) (err error) = FindNextFileW
   246  //sys	FindClose(handle Handle) (err error)
   247  //sys	GetFileInformationByHandle(handle Handle, data *ByHandleFileInformation) (err error)
   248  //sys	GetCurrentDirectory(buflen uint32, buf *uint16) (n uint32, err error) = GetCurrentDirectoryW
   249  //sys	SetCurrentDirectory(path *uint16) (err error) = SetCurrentDirectoryW
   250  //sys	CreateDirectory(path *uint16, sa *SecurityAttributes) (err error) = CreateDirectoryW
   251  //sys	RemoveDirectory(path *uint16) (err error) = RemoveDirectoryW
   252  //sys	DeleteFile(path *uint16) (err error) = DeleteFileW
   253  //sys	MoveFile(from *uint16, to *uint16) (err error) = MoveFileW
   254  //sys	GetComputerName(buf *uint16, n *uint32) (err error) = GetComputerNameW
   255  //sys	SetEndOfFile(handle Handle) (err error)
   256  //sys	GetSystemTimeAsFileTime(time *Filetime)
   257  //sys	GetTimeZoneInformation(tzi *Timezoneinformation) (rc uint32, err error) [failretval==0xffffffff]
   258  //sys	createIoCompletionPort(filehandle Handle, cphandle Handle, key uintptr, threadcnt uint32) (handle Handle, err error) = CreateIoCompletionPort
   259  //sys	getQueuedCompletionStatus(cphandle Handle, qty *uint32, key *uintptr, overlapped **Overlapped, timeout uint32) (err error) = GetQueuedCompletionStatus
   260  //sys	postQueuedCompletionStatus(cphandle Handle, qty uint32, key uintptr, overlapped *Overlapped) (err error) = PostQueuedCompletionStatus
   261  //sys	CancelIo(s Handle) (err error)
   262  //sys	CancelIoEx(s Handle, o *Overlapped) (err error)
   263  //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
   264  //sys	CreateProcessAsUser(token Token, appName *uint16, commandLine *uint16, procSecurity *SecurityAttributes, threadSecurity *SecurityAttributes, inheritHandles bool, creationFlags uint32, env *uint16, currentDir *uint16, startupInfo *StartupInfo, outProcInfo *ProcessInformation) (err error) = advapi32.CreateProcessAsUserW
   265  //sys	OpenProcess(da uint32, inheritHandle bool, pid uint32) (handle Handle, err error)
   266  //sys	TerminateProcess(handle Handle, exitcode uint32) (err error)
   267  //sys	GetExitCodeProcess(handle Handle, exitcode *uint32) (err error)
   268  //sys	getStartupInfo(startupInfo *StartupInfo) = GetStartupInfoW
   269  //sys	GetCurrentProcess() (pseudoHandle Handle, err error)
   270  //sys	GetProcessTimes(handle Handle, creationTime *Filetime, exitTime *Filetime, kernelTime *Filetime, userTime *Filetime) (err error)
   271  //sys	DuplicateHandle(hSourceProcessHandle Handle, hSourceHandle Handle, hTargetProcessHandle Handle, lpTargetHandle *Handle, dwDesiredAccess uint32, bInheritHandle bool, dwOptions uint32) (err error)
   272  //sys	WaitForSingleObject(handle Handle, waitMilliseconds uint32) (event uint32, err error) [failretval==0xffffffff]
   273  //sys	GetTempPath(buflen uint32, buf *uint16) (n uint32, err error) = GetTempPathW
   274  //sys	CreatePipe(readhandle *Handle, writehandle *Handle, sa *SecurityAttributes, size uint32) (err error)
   275  //sys	GetFileType(filehandle Handle) (n uint32, err error)
   276  //sys	CryptAcquireContext(provhandle *Handle, container *uint16, provider *uint16, provtype uint32, flags uint32) (err error) = advapi32.CryptAcquireContextW
   277  //sys	CryptReleaseContext(provhandle Handle, flags uint32) (err error) = advapi32.CryptReleaseContext
   278  //sys	CryptGenRandom(provhandle Handle, buflen uint32, buf *byte) (err error) = advapi32.CryptGenRandom
   279  //sys	GetEnvironmentStrings() (envs *uint16, err error) [failretval==nil] = kernel32.GetEnvironmentStringsW
   280  //sys	FreeEnvironmentStrings(envs *uint16) (err error) = kernel32.FreeEnvironmentStringsW
   281  //sys	GetEnvironmentVariable(name *uint16, buffer *uint16, size uint32) (n uint32, err error) = kernel32.GetEnvironmentVariableW
   282  //sys	SetEnvironmentVariable(name *uint16, value *uint16) (err error) = kernel32.SetEnvironmentVariableW
   283  //sys	SetFileTime(handle Handle, ctime *Filetime, atime *Filetime, wtime *Filetime) (err error)
   284  //sys	GetFileAttributes(name *uint16) (attrs uint32, err error) [failretval==INVALID_FILE_ATTRIBUTES] = kernel32.GetFileAttributesW
   285  //sys	SetFileAttributes(name *uint16, attrs uint32) (err error) = kernel32.SetFileAttributesW
   286  //sys	GetFileAttributesEx(name *uint16, level uint32, info *byte) (err error) = kernel32.GetFileAttributesExW
   287  //sys	GetCommandLine() (cmd *uint16) = kernel32.GetCommandLineW
   288  //sys	CommandLineToArgv(cmd *uint16, argc *int32) (argv *[8192]*[8192]uint16, err error) [failretval==nil] = shell32.CommandLineToArgvW
   289  //sys	LocalFree(hmem Handle) (handle Handle, err error) [failretval!=0]
   290  //sys	SetHandleInformation(handle Handle, mask uint32, flags uint32) (err error)
   291  //sys	FlushFileBuffers(handle Handle) (err error)
   292  //sys	GetFullPathName(path *uint16, buflen uint32, buf *uint16, fname **uint16) (n uint32, err error) = kernel32.GetFullPathNameW
   293  //sys	GetLongPathName(path *uint16, buf *uint16, buflen uint32) (n uint32, err error) = kernel32.GetLongPathNameW
   294  //sys	GetShortPathName(longpath *uint16, shortpath *uint16, buflen uint32) (n uint32, err error) = kernel32.GetShortPathNameW
   295  //sys	CreateFileMapping(fhandle Handle, sa *SecurityAttributes, prot uint32, maxSizeHigh uint32, maxSizeLow uint32, name *uint16) (handle Handle, err error) = kernel32.CreateFileMappingW
   296  //sys	MapViewOfFile(handle Handle, access uint32, offsetHigh uint32, offsetLow uint32, length uintptr) (addr uintptr, err error)
   297  //sys	UnmapViewOfFile(addr uintptr) (err error)
   298  //sys	FlushViewOfFile(addr uintptr, length uintptr) (err error)
   299  //sys	VirtualLock(addr uintptr, length uintptr) (err error)
   300  //sys	VirtualUnlock(addr uintptr, length uintptr) (err error)
   301  //sys	TransmitFile(s Handle, handle Handle, bytesToWrite uint32, bytsPerSend uint32, overlapped *Overlapped, transmitFileBuf *TransmitFileBuffers, flags uint32) (err error) = mswsock.TransmitFile
   302  //sys	ReadDirectoryChanges(handle Handle, buf *byte, buflen uint32, watchSubTree bool, mask uint32, retlen *uint32, overlapped *Overlapped, completionRoutine uintptr) (err error) = kernel32.ReadDirectoryChangesW
   303  //sys	CertOpenSystemStore(hprov Handle, name *uint16) (store Handle, err error) = crypt32.CertOpenSystemStoreW
   304  //sys   CertOpenStore(storeProvider uintptr, msgAndCertEncodingType uint32, cryptProv uintptr, flags uint32, para uintptr) (handle Handle, err error) = crypt32.CertOpenStore
   305  //sys	CertEnumCertificatesInStore(store Handle, prevContext *CertContext) (context *CertContext, err error) [failretval==nil] = crypt32.CertEnumCertificatesInStore
   306  //sys   CertAddCertificateContextToStore(store Handle, certContext *CertContext, addDisposition uint32, storeContext **CertContext) (err error) = crypt32.CertAddCertificateContextToStore
   307  //sys	CertCloseStore(store Handle, flags uint32) (err error) = crypt32.CertCloseStore
   308  //sys   CertGetCertificateChain(engine Handle, leaf *CertContext, time *Filetime, additionalStore Handle, para *CertChainPara, flags uint32, reserved uintptr, chainCtx **CertChainContext) (err error) = crypt32.CertGetCertificateChain
   309  //sys   CertFreeCertificateChain(ctx *CertChainContext) = crypt32.CertFreeCertificateChain
   310  //sys   CertCreateCertificateContext(certEncodingType uint32, certEncoded *byte, encodedLen uint32) (context *CertContext, err error) [failretval==nil] = crypt32.CertCreateCertificateContext
   311  //sys   CertFreeCertificateContext(ctx *CertContext) (err error) = crypt32.CertFreeCertificateContext
   312  //sys   CertVerifyCertificateChainPolicy(policyOID uintptr, chain *CertChainContext, para *CertChainPolicyPara, status *CertChainPolicyStatus) (err error) = crypt32.CertVerifyCertificateChainPolicy
   313  //sys	RegOpenKeyEx(key Handle, subkey *uint16, options uint32, desiredAccess uint32, result *Handle) (regerrno error) = advapi32.RegOpenKeyExW
   314  //sys	RegCloseKey(key Handle) (regerrno error) = advapi32.RegCloseKey
   315  //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
   316  //sys	regEnumKeyEx(key Handle, index uint32, name *uint16, nameLen *uint32, reserved *uint32, class *uint16, classLen *uint32, lastWriteTime *Filetime) (regerrno error) = advapi32.RegEnumKeyExW
   317  //sys	RegQueryValueEx(key Handle, name *uint16, reserved *uint32, valtype *uint32, buf *byte, buflen *uint32) (regerrno error) = advapi32.RegQueryValueExW
   318  //sys	getCurrentProcessId() (pid uint32) = kernel32.GetCurrentProcessId
   319  //sys	GetConsoleMode(console Handle, mode *uint32) (err error) = kernel32.GetConsoleMode
   320  //sys	WriteConsole(console Handle, buf *uint16, towrite uint32, written *uint32, reserved *byte) (err error) = kernel32.WriteConsoleW
   321  //sys	ReadConsole(console Handle, buf *uint16, toread uint32, read *uint32, inputControl *byte) (err error) = kernel32.ReadConsoleW
   322  //sys	CreateToolhelp32Snapshot(flags uint32, processId uint32) (handle Handle, err error) [failretval==InvalidHandle] = kernel32.CreateToolhelp32Snapshot
   323  //sys	Process32First(snapshot Handle, procEntry *ProcessEntry32) (err error) = kernel32.Process32FirstW
   324  //sys	Process32Next(snapshot Handle, procEntry *ProcessEntry32) (err error) = kernel32.Process32NextW
   325  //sys	DeviceIoControl(handle Handle, ioControlCode uint32, inBuffer *byte, inBufferSize uint32, outBuffer *byte, outBufferSize uint32, bytesReturned *uint32, overlapped *Overlapped) (err error)
   326  //sys	setFileInformationByHandle(handle Handle, fileInformationClass uint32, buf unsafe.Pointer, bufsize uint32) (err error) = kernel32.SetFileInformationByHandle
   327  // This function returns 1 byte BOOLEAN rather than the 4 byte BOOL.
   328  //sys	CreateSymbolicLink(symlinkfilename *uint16, targetfilename *uint16, flags uint32) (err error) [failretval&0xff==0] = CreateSymbolicLinkW
   329  //sys	CreateHardLink(filename *uint16, existingfilename *uint16, reserved uintptr) (err error) [failretval&0xff==0] = CreateHardLinkW
   330  //sys	initializeProcThreadAttributeList(attrlist *_PROC_THREAD_ATTRIBUTE_LIST, attrcount uint32, flags uint32, size *uintptr) (err error) = InitializeProcThreadAttributeList
   331  //sys	deleteProcThreadAttributeList(attrlist *_PROC_THREAD_ATTRIBUTE_LIST) = DeleteProcThreadAttributeList
   332  //sys	updateProcThreadAttribute(attrlist *_PROC_THREAD_ATTRIBUTE_LIST, flags uint32, attr uintptr, value unsafe.Pointer, size uintptr, prevvalue unsafe.Pointer, returnedsize *uintptr) (err error) = UpdateProcThreadAttribute
   333  //sys	getFinalPathNameByHandle(file Handle, filePath *uint16, filePathSize uint32, flags uint32) (n uint32, err error) [n == 0 || n >= filePathSize] = kernel32.GetFinalPathNameByHandleW
   334  
   335  // syscall interface implementation for other packages
   336  
   337  func makeInheritSa() *SecurityAttributes {
   338  	var sa SecurityAttributes
   339  	sa.Length = uint32(unsafe.Sizeof(sa))
   340  	sa.InheritHandle = 1
   341  	return &sa
   342  }
   343  
   344  func Open(name string, flag int, perm uint32) (fd Handle, err error) {
   345  	if len(name) == 0 {
   346  		return InvalidHandle, ERROR_FILE_NOT_FOUND
   347  	}
   348  	namep, err := UTF16PtrFromString(name)
   349  	if err != nil {
   350  		return InvalidHandle, err
   351  	}
   352  	var access uint32
   353  	switch flag & (O_RDONLY | O_WRONLY | O_RDWR) {
   354  	case O_RDONLY:
   355  		access = GENERIC_READ
   356  	case O_WRONLY:
   357  		access = GENERIC_WRITE
   358  	case O_RDWR:
   359  		access = GENERIC_READ | GENERIC_WRITE
   360  	}
   361  	if flag&O_CREAT != 0 {
   362  		access |= GENERIC_WRITE
   363  	}
   364  	if flag&O_APPEND != 0 {
   365  		// Remove GENERIC_WRITE unless O_TRUNC is set, in which case we need it to truncate the file.
   366  		// We can't just remove FILE_WRITE_DATA because GENERIC_WRITE without FILE_WRITE_DATA
   367  		// starts appending at the beginning of the file rather than at the end.
   368  		if flag&O_TRUNC == 0 {
   369  			access &^= GENERIC_WRITE
   370  		}
   371  		// Set all access rights granted by GENERIC_WRITE except for FILE_WRITE_DATA.
   372  		access |= FILE_APPEND_DATA | FILE_WRITE_ATTRIBUTES | _FILE_WRITE_EA | STANDARD_RIGHTS_WRITE | SYNCHRONIZE
   373  	}
   374  	sharemode := uint32(FILE_SHARE_READ | FILE_SHARE_WRITE)
   375  	var sa *SecurityAttributes
   376  	if flag&O_CLOEXEC == 0 {
   377  		sa = makeInheritSa()
   378  	}
   379  	// We don't use CREATE_ALWAYS, because when opening a file with
   380  	// FILE_ATTRIBUTE_READONLY these will replace an existing file
   381  	// with a new, read-only one. See https://go.dev/issue/38225.
   382  	//
   383  	// Instead, we ftruncate the file after opening when O_TRUNC is set.
   384  	var createmode uint32
   385  	switch {
   386  	case flag&(O_CREAT|O_EXCL) == (O_CREAT | O_EXCL):
   387  		createmode = CREATE_NEW
   388  	case flag&O_CREAT == O_CREAT:
   389  		createmode = OPEN_ALWAYS
   390  	default:
   391  		createmode = OPEN_EXISTING
   392  	}
   393  	var attrs uint32 = FILE_ATTRIBUTE_NORMAL
   394  	if perm&S_IWRITE == 0 {
   395  		attrs = FILE_ATTRIBUTE_READONLY
   396  	}
   397  	if flag&O_WRONLY == 0 && flag&O_RDWR == 0 {
   398  		// We might be opening or creating a directory.
   399  		// CreateFile requires FILE_FLAG_BACKUP_SEMANTICS
   400  		// to work with directories.
   401  		attrs |= FILE_FLAG_BACKUP_SEMANTICS
   402  	}
   403  	if flag&O_SYNC != 0 {
   404  		const _FILE_FLAG_WRITE_THROUGH = 0x80000000
   405  		attrs |= _FILE_FLAG_WRITE_THROUGH
   406  	}
   407  	h, err := createFile(namep, access, sharemode, sa, createmode, attrs, 0)
   408  	if h == InvalidHandle {
   409  		if err == ERROR_ACCESS_DENIED && (flag&O_WRONLY != 0 || flag&O_RDWR != 0) {
   410  			// We should return EISDIR when we are trying to open a directory with write access.
   411  			fa, e1 := GetFileAttributes(namep)
   412  			if e1 == nil && fa&FILE_ATTRIBUTE_DIRECTORY != 0 {
   413  				err = EISDIR
   414  			}
   415  		}
   416  		return h, err
   417  	}
   418  	// Ignore O_TRUNC if the file has just been created.
   419  	if flag&O_TRUNC == O_TRUNC &&
   420  		(createmode == OPEN_EXISTING || (createmode == OPEN_ALWAYS && err == ERROR_ALREADY_EXISTS)) {
   421  		err = Ftruncate(h, 0)
   422  		if err != nil {
   423  			CloseHandle(h)
   424  			return InvalidHandle, err
   425  		}
   426  	}
   427  	return h, nil
   428  }
   429  
   430  func Read(fd Handle, p []byte) (n int, err error) {
   431  	var done uint32
   432  	e := ReadFile(fd, p, &done, nil)
   433  	if e != nil {
   434  		if e == ERROR_BROKEN_PIPE {
   435  			// NOTE(brainman): work around ERROR_BROKEN_PIPE is returned on reading EOF from stdin
   436  			return 0, nil
   437  		}
   438  		return 0, e
   439  	}
   440  	return int(done), nil
   441  }
   442  
   443  func Write(fd Handle, p []byte) (n int, err error) {
   444  	var done uint32
   445  	e := WriteFile(fd, p, &done, nil)
   446  	if e != nil {
   447  		return 0, e
   448  	}
   449  	return int(done), nil
   450  }
   451  
   452  func ReadFile(fd Handle, p []byte, done *uint32, overlapped *Overlapped) error {
   453  	err := readFile(fd, p, done, overlapped)
   454  	if race.Enabled {
   455  		if *done > 0 {
   456  			race.WriteRange(unsafe.Pointer(&p[0]), int(*done))
   457  		}
   458  		race.Acquire(unsafe.Pointer(&ioSync))
   459  	}
   460  	if msan.Enabled && *done > 0 {
   461  		msan.Write(unsafe.Pointer(&p[0]), uintptr(*done))
   462  	}
   463  	if asan.Enabled && *done > 0 {
   464  		asan.Write(unsafe.Pointer(&p[0]), uintptr(*done))
   465  	}
   466  	return err
   467  }
   468  
   469  func WriteFile(fd Handle, p []byte, done *uint32, overlapped *Overlapped) error {
   470  	if race.Enabled {
   471  		race.ReleaseMerge(unsafe.Pointer(&ioSync))
   472  	}
   473  	err := writeFile(fd, p, done, overlapped)
   474  	if race.Enabled && *done > 0 {
   475  		race.ReadRange(unsafe.Pointer(&p[0]), int(*done))
   476  	}
   477  	if msan.Enabled && *done > 0 {
   478  		msan.Read(unsafe.Pointer(&p[0]), uintptr(*done))
   479  	}
   480  	if asan.Enabled && *done > 0 {
   481  		asan.Read(unsafe.Pointer(&p[0]), uintptr(*done))
   482  	}
   483  	return err
   484  }
   485  
   486  var ioSync int64
   487  
   488  var procSetFilePointerEx = modkernel32.NewProc("SetFilePointerEx")
   489  
   490  const ptrSize = unsafe.Sizeof(uintptr(0))
   491  
   492  // setFilePointerEx calls SetFilePointerEx.
   493  // See https://learn.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-setfilepointerex
   494  func setFilePointerEx(handle Handle, distToMove int64, newFilePointer *int64, whence uint32) error {
   495  	var e1 Errno
   496  	if unsafe.Sizeof(uintptr(0)) == 8 {
   497  		_, _, e1 = Syscall6(procSetFilePointerEx.Addr(), 4, uintptr(handle), uintptr(distToMove), uintptr(unsafe.Pointer(newFilePointer)), uintptr(whence), 0, 0)
   498  	} else {
   499  		// Different 32-bit systems disgaree about whether distToMove starts 8-byte aligned.
   500  		switch runtime.GOARCH {
   501  		default:
   502  			panic("unsupported 32-bit architecture")
   503  		case "386":
   504  			// distToMove is a LARGE_INTEGER, which is 64 bits.
   505  			_, _, e1 = Syscall6(procSetFilePointerEx.Addr(), 5, uintptr(handle), uintptr(distToMove), uintptr(distToMove>>32), uintptr(unsafe.Pointer(newFilePointer)), uintptr(whence), 0)
   506  		case "arm":
   507  			// distToMove must be 8-byte aligned per ARM calling convention
   508  			// https://docs.microsoft.com/en-us/cpp/build/overview-of-arm-abi-conventions#stage-c-assignment-of-arguments-to-registers-and-stack
   509  			_, _, e1 = Syscall6(procSetFilePointerEx.Addr(), 6, uintptr(handle), 0, uintptr(distToMove), uintptr(distToMove>>32), uintptr(unsafe.Pointer(newFilePointer)), uintptr(whence))
   510  		}
   511  	}
   512  	if e1 != 0 {
   513  		return errnoErr(e1)
   514  	}
   515  	return nil
   516  }
   517  
   518  func Seek(fd Handle, offset int64, whence int) (newoffset int64, err error) {
   519  	var w uint32
   520  	switch whence {
   521  	case 0:
   522  		w = FILE_BEGIN
   523  	case 1:
   524  		w = FILE_CURRENT
   525  	case 2:
   526  		w = FILE_END
   527  	}
   528  	err = setFilePointerEx(fd, offset, &newoffset, w)
   529  	return
   530  }
   531  
   532  func Close(fd Handle) (err error) {
   533  	return CloseHandle(fd)
   534  }
   535  
   536  var (
   537  	Stdin  = getStdHandle(STD_INPUT_HANDLE)
   538  	Stdout = getStdHandle(STD_OUTPUT_HANDLE)
   539  	Stderr = getStdHandle(STD_ERROR_HANDLE)
   540  )
   541  
   542  func getStdHandle(h int) (fd Handle) {
   543  	r, _ := GetStdHandle(h)
   544  	return r
   545  }
   546  
   547  const ImplementsGetwd = true
   548  
   549  func Getwd() (wd string, err error) {
   550  	b := make([]uint16, 300)
   551  	// The path of the current directory may not fit in the initial 300-word
   552  	// buffer when long path support is enabled. The current directory may also
   553  	// change between subsequent calls of GetCurrentDirectory. As a result, we
   554  	// need to retry the call in a loop until the current directory fits, each
   555  	// time with a bigger buffer.
   556  	for {
   557  		n, e := GetCurrentDirectory(uint32(len(b)), &b[0])
   558  		if e != nil {
   559  			return "", e
   560  		}
   561  		if int(n) <= len(b) {
   562  			return UTF16ToString(b[:n]), nil
   563  		}
   564  		b = make([]uint16, n)
   565  	}
   566  }
   567  
   568  func Chdir(path string) (err error) {
   569  	pathp, err := UTF16PtrFromString(path)
   570  	if err != nil {
   571  		return err
   572  	}
   573  	return SetCurrentDirectory(pathp)
   574  }
   575  
   576  func Mkdir(path string, mode uint32) (err error) {
   577  	pathp, err := UTF16PtrFromString(path)
   578  	if err != nil {
   579  		return err
   580  	}
   581  	return CreateDirectory(pathp, nil)
   582  }
   583  
   584  func Rmdir(path string) (err error) {
   585  	pathp, err := UTF16PtrFromString(path)
   586  	if err != nil {
   587  		return err
   588  	}
   589  	return RemoveDirectory(pathp)
   590  }
   591  
   592  func Unlink(path string) (err error) {
   593  	pathp, err := UTF16PtrFromString(path)
   594  	if err != nil {
   595  		return err
   596  	}
   597  	return DeleteFile(pathp)
   598  }
   599  
   600  func Rename(oldpath, newpath string) (err error) {
   601  	from, err := UTF16PtrFromString(oldpath)
   602  	if err != nil {
   603  		return err
   604  	}
   605  	to, err := UTF16PtrFromString(newpath)
   606  	if err != nil {
   607  		return err
   608  	}
   609  	return MoveFile(from, to)
   610  }
   611  
   612  func ComputerName() (name string, err error) {
   613  	var n uint32 = MAX_COMPUTERNAME_LENGTH + 1
   614  	b := make([]uint16, n)
   615  	e := GetComputerName(&b[0], &n)
   616  	if e != nil {
   617  		return "", e
   618  	}
   619  	return UTF16ToString(b[:n]), nil
   620  }
   621  
   622  func Ftruncate(fd Handle, length int64) (err error) {
   623  	type _FILE_END_OF_FILE_INFO struct {
   624  		EndOfFile int64
   625  	}
   626  	const FileEndOfFileInfo = 6
   627  	var info _FILE_END_OF_FILE_INFO
   628  	info.EndOfFile = length
   629  	return setFileInformationByHandle(fd, FileEndOfFileInfo, unsafe.Pointer(&info), uint32(unsafe.Sizeof(info)))
   630  }
   631  
   632  func Gettimeofday(tv *Timeval) (err error) {
   633  	var ft Filetime
   634  	GetSystemTimeAsFileTime(&ft)
   635  	*tv = NsecToTimeval(ft.Nanoseconds())
   636  	return nil
   637  }
   638  
   639  func Pipe(p []Handle) (err error) {
   640  	if len(p) != 2 {
   641  		return EINVAL
   642  	}
   643  	var r, w Handle
   644  	e := CreatePipe(&r, &w, makeInheritSa(), 0)
   645  	if e != nil {
   646  		return e
   647  	}
   648  	p[0] = r
   649  	p[1] = w
   650  	return nil
   651  }
   652  
   653  func Utimes(path string, tv []Timeval) (err error) {
   654  	if len(tv) != 2 {
   655  		return EINVAL
   656  	}
   657  	pathp, e := UTF16PtrFromString(path)
   658  	if e != nil {
   659  		return e
   660  	}
   661  	h, e := CreateFile(pathp,
   662  		FILE_WRITE_ATTRIBUTES, FILE_SHARE_WRITE, nil,
   663  		OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0)
   664  	if e != nil {
   665  		return e
   666  	}
   667  	defer Close(h)
   668  	a := Filetime{}
   669  	w := Filetime{}
   670  	if tv[0].Nanoseconds() != 0 {
   671  		a = NsecToFiletime(tv[0].Nanoseconds())
   672  	}
   673  	if tv[0].Nanoseconds() != 0 {
   674  		w = NsecToFiletime(tv[1].Nanoseconds())
   675  	}
   676  	return SetFileTime(h, nil, &a, &w)
   677  }
   678  
   679  // This matches the value in os/file_windows.go.
   680  const _UTIME_OMIT = -1
   681  
   682  func UtimesNano(path string, ts []Timespec) (err error) {
   683  	if len(ts) != 2 {
   684  		return EINVAL
   685  	}
   686  	pathp, e := UTF16PtrFromString(path)
   687  	if e != nil {
   688  		return e
   689  	}
   690  	h, e := CreateFile(pathp,
   691  		FILE_WRITE_ATTRIBUTES, FILE_SHARE_WRITE, nil,
   692  		OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0)
   693  	if e != nil {
   694  		return e
   695  	}
   696  	defer Close(h)
   697  	a := Filetime{}
   698  	w := Filetime{}
   699  	if ts[0].Nsec != _UTIME_OMIT {
   700  		a = NsecToFiletime(TimespecToNsec(ts[0]))
   701  	}
   702  	if ts[1].Nsec != _UTIME_OMIT {
   703  		w = NsecToFiletime(TimespecToNsec(ts[1]))
   704  	}
   705  	return SetFileTime(h, nil, &a, &w)
   706  }
   707  
   708  func Fsync(fd Handle) (err error) {
   709  	return FlushFileBuffers(fd)
   710  }
   711  
   712  func Chmod(path string, mode uint32) (err error) {
   713  	p, e := UTF16PtrFromString(path)
   714  	if e != nil {
   715  		return e
   716  	}
   717  	attrs, e := GetFileAttributes(p)
   718  	if e != nil {
   719  		return e
   720  	}
   721  	if mode&S_IWRITE != 0 {
   722  		attrs &^= FILE_ATTRIBUTE_READONLY
   723  	} else {
   724  		attrs |= FILE_ATTRIBUTE_READONLY
   725  	}
   726  	return SetFileAttributes(p, attrs)
   727  }
   728  
   729  func LoadCancelIoEx() error {
   730  	return procCancelIoEx.Find()
   731  }
   732  
   733  func LoadSetFileCompletionNotificationModes() error {
   734  	return procSetFileCompletionNotificationModes.Find()
   735  }
   736  
   737  // net api calls
   738  
   739  const socket_error = uintptr(^uint32(0))
   740  
   741  //sys	WSAStartup(verreq uint32, data *WSAData) (sockerr error) = ws2_32.WSAStartup
   742  //sys	WSACleanup() (err error) [failretval==socket_error] = ws2_32.WSACleanup
   743  //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
   744  //sys	socket(af int32, typ int32, protocol int32) (handle Handle, err error) [failretval==InvalidHandle] = ws2_32.socket
   745  //sys	Setsockopt(s Handle, level int32, optname int32, optval *byte, optlen int32) (err error) [failretval==socket_error] = ws2_32.setsockopt
   746  //sys	Getsockopt(s Handle, level int32, optname int32, optval *byte, optlen *int32) (err error) [failretval==socket_error] = ws2_32.getsockopt
   747  //sys	bind(s Handle, name unsafe.Pointer, namelen int32) (err error) [failretval==socket_error] = ws2_32.bind
   748  //sys	connect(s Handle, name unsafe.Pointer, namelen int32) (err error) [failretval==socket_error] = ws2_32.connect
   749  //sys	getsockname(s Handle, rsa *RawSockaddrAny, addrlen *int32) (err error) [failretval==socket_error] = ws2_32.getsockname
   750  //sys	getpeername(s Handle, rsa *RawSockaddrAny, addrlen *int32) (err error) [failretval==socket_error] = ws2_32.getpeername
   751  //sys	listen(s Handle, backlog int32) (err error) [failretval==socket_error] = ws2_32.listen
   752  //sys	shutdown(s Handle, how int32) (err error) [failretval==socket_error] = ws2_32.shutdown
   753  //sys	Closesocket(s Handle) (err error) [failretval==socket_error] = ws2_32.closesocket
   754  //sys	AcceptEx(ls Handle, as Handle, buf *byte, rxdatalen uint32, laddrlen uint32, raddrlen uint32, recvd *uint32, overlapped *Overlapped) (err error) = mswsock.AcceptEx
   755  //sys	GetAcceptExSockaddrs(buf *byte, rxdatalen uint32, laddrlen uint32, raddrlen uint32, lrsa **RawSockaddrAny, lrsalen *int32, rrsa **RawSockaddrAny, rrsalen *int32) = mswsock.GetAcceptExSockaddrs
   756  //sys	WSARecv(s Handle, bufs *WSABuf, bufcnt uint32, recvd *uint32, flags *uint32, overlapped *Overlapped, croutine *byte) (err error) [failretval==socket_error] = ws2_32.WSARecv
   757  //sys	WSASend(s Handle, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, overlapped *Overlapped, croutine *byte) (err error) [failretval==socket_error] = ws2_32.WSASend
   758  //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
   759  //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
   760  //sys	GetHostByName(name string) (h *Hostent, err error) [failretval==nil] = ws2_32.gethostbyname
   761  //sys	GetServByName(name string, proto string) (s *Servent, err error) [failretval==nil] = ws2_32.getservbyname
   762  //sys	Ntohs(netshort uint16) (u uint16) = ws2_32.ntohs
   763  //sys	GetProtoByName(name string) (p *Protoent, err error) [failretval==nil] = ws2_32.getprotobyname
   764  //sys	DnsQuery(name string, qtype uint16, options uint32, extra *byte, qrs **DNSRecord, pr *byte) (status error) = dnsapi.DnsQuery_W
   765  //sys	DnsRecordListFree(rl *DNSRecord, freetype uint32) = dnsapi.DnsRecordListFree
   766  //sys	DnsNameCompare(name1 *uint16, name2 *uint16) (same bool) = dnsapi.DnsNameCompare_W
   767  //sys	GetAddrInfoW(nodename *uint16, servicename *uint16, hints *AddrinfoW, result **AddrinfoW) (sockerr error) = ws2_32.GetAddrInfoW
   768  //sys	FreeAddrInfoW(addrinfo *AddrinfoW) = ws2_32.FreeAddrInfoW
   769  //sys	GetIfEntry(pIfRow *MibIfRow) (errcode error) = iphlpapi.GetIfEntry
   770  //sys	GetAdaptersInfo(ai *IpAdapterInfo, ol *uint32) (errcode error) = iphlpapi.GetAdaptersInfo
   771  //sys	SetFileCompletionNotificationModes(handle Handle, flags uint8) (err error) = kernel32.SetFileCompletionNotificationModes
   772  //sys	WSAEnumProtocols(protocols *int32, protocolBuffer *WSAProtocolInfo, bufferLength *uint32) (n int32, err error) [failretval==-1] = ws2_32.WSAEnumProtocolsW
   773  
   774  // For testing: clients can set this flag to force
   775  // creation of IPv6 sockets to return [EAFNOSUPPORT].
   776  var SocketDisableIPv6 bool
   777  
   778  type RawSockaddrInet4 struct {
   779  	Family uint16
   780  	Port   uint16
   781  	Addr   [4]byte /* in_addr */
   782  	Zero   [8]uint8
   783  }
   784  
   785  type RawSockaddrInet6 struct {
   786  	Family   uint16
   787  	Port     uint16
   788  	Flowinfo uint32
   789  	Addr     [16]byte /* in6_addr */
   790  	Scope_id uint32
   791  }
   792  
   793  type RawSockaddr struct {
   794  	Family uint16
   795  	Data   [14]int8
   796  }
   797  
   798  type RawSockaddrAny struct {
   799  	Addr RawSockaddr
   800  	Pad  [100]int8
   801  }
   802  
   803  type Sockaddr interface {
   804  	sockaddr() (ptr unsafe.Pointer, len int32, err error) // lowercase; only we can define Sockaddrs
   805  }
   806  
   807  type SockaddrInet4 struct {
   808  	Port int
   809  	Addr [4]byte
   810  	raw  RawSockaddrInet4
   811  }
   812  
   813  func (sa *SockaddrInet4) sockaddr() (unsafe.Pointer, int32, error) {
   814  	if sa.Port < 0 || sa.Port > 0xFFFF {
   815  		return nil, 0, EINVAL
   816  	}
   817  	sa.raw.Family = AF_INET
   818  	p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
   819  	p[0] = byte(sa.Port >> 8)
   820  	p[1] = byte(sa.Port)
   821  	sa.raw.Addr = sa.Addr
   822  	return unsafe.Pointer(&sa.raw), int32(unsafe.Sizeof(sa.raw)), nil
   823  }
   824  
   825  type SockaddrInet6 struct {
   826  	Port   int
   827  	ZoneId uint32
   828  	Addr   [16]byte
   829  	raw    RawSockaddrInet6
   830  }
   831  
   832  func (sa *SockaddrInet6) sockaddr() (unsafe.Pointer, int32, error) {
   833  	if sa.Port < 0 || sa.Port > 0xFFFF {
   834  		return nil, 0, EINVAL
   835  	}
   836  	sa.raw.Family = AF_INET6
   837  	p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
   838  	p[0] = byte(sa.Port >> 8)
   839  	p[1] = byte(sa.Port)
   840  	sa.raw.Scope_id = sa.ZoneId
   841  	sa.raw.Addr = sa.Addr
   842  	return unsafe.Pointer(&sa.raw), int32(unsafe.Sizeof(sa.raw)), nil
   843  }
   844  
   845  type RawSockaddrUnix struct {
   846  	Family uint16
   847  	Path   [UNIX_PATH_MAX]int8
   848  }
   849  
   850  type SockaddrUnix struct {
   851  	Name string
   852  	raw  RawSockaddrUnix
   853  }
   854  
   855  func (sa *SockaddrUnix) sockaddr() (unsafe.Pointer, int32, error) {
   856  	name := sa.Name
   857  	n := len(name)
   858  	if n > len(sa.raw.Path) {
   859  		return nil, 0, EINVAL
   860  	}
   861  	// Abstract addresses start with NUL.
   862  	// '@' is also a valid way to specify abstract addresses.
   863  	isAbstract := n > 0 && (name[0] == '@' || name[0] == '\x00')
   864  
   865  	// Non-abstract named addresses are NUL terminated.
   866  	// The length can't use the full capacity as we need to add NUL.
   867  	if n == len(sa.raw.Path) && !isAbstract {
   868  		return nil, 0, EINVAL
   869  	}
   870  	sa.raw.Family = AF_UNIX
   871  	for i := 0; i < n; i++ {
   872  		sa.raw.Path[i] = int8(name[i])
   873  	}
   874  	// Length is family + name (+ NUL if non-abstract).
   875  	// Family is of type uint16 (2 bytes).
   876  	sl := int32(2 + n)
   877  	if isAbstract {
   878  		// Abstract addresses are not NUL terminated.
   879  		// We rewrite '@' prefix to NUL here.
   880  		sa.raw.Path[0] = 0
   881  	} else if n > 0 {
   882  		// Add NUL for non-abstract named addresses.
   883  		sl++
   884  	}
   885  
   886  	return unsafe.Pointer(&sa.raw), sl, nil
   887  }
   888  
   889  func (rsa *RawSockaddrAny) Sockaddr() (Sockaddr, error) {
   890  	switch rsa.Addr.Family {
   891  	case AF_UNIX:
   892  		pp := (*RawSockaddrUnix)(unsafe.Pointer(rsa))
   893  		sa := new(SockaddrUnix)
   894  		if pp.Path[0] == 0 {
   895  			// "Abstract" Unix domain socket.
   896  			// Rewrite leading NUL as @ for textual display.
   897  			// (This is the standard convention.)
   898  			// Not friendly to overwrite in place,
   899  			// but the callers below don't care.
   900  			pp.Path[0] = '@'
   901  		}
   902  
   903  		// Assume path ends at NUL.
   904  		// This is not technically the Linux semantics for
   905  		// abstract Unix domain sockets--they are supposed
   906  		// to be uninterpreted fixed-size binary blobs--but
   907  		// everyone uses this convention.
   908  		n := 0
   909  		for n < len(pp.Path) && pp.Path[n] != 0 {
   910  			n++
   911  		}
   912  		sa.Name = string(unsafe.Slice((*byte)(unsafe.Pointer(&pp.Path[0])), n))
   913  		return sa, nil
   914  
   915  	case AF_INET:
   916  		pp := (*RawSockaddrInet4)(unsafe.Pointer(rsa))
   917  		sa := new(SockaddrInet4)
   918  		p := (*[2]byte)(unsafe.Pointer(&pp.Port))
   919  		sa.Port = int(p[0])<<8 + int(p[1])
   920  		sa.Addr = pp.Addr
   921  		return sa, nil
   922  
   923  	case AF_INET6:
   924  		pp := (*RawSockaddrInet6)(unsafe.Pointer(rsa))
   925  		sa := new(SockaddrInet6)
   926  		p := (*[2]byte)(unsafe.Pointer(&pp.Port))
   927  		sa.Port = int(p[0])<<8 + int(p[1])
   928  		sa.ZoneId = pp.Scope_id
   929  		sa.Addr = pp.Addr
   930  		return sa, nil
   931  	}
   932  	return nil, EAFNOSUPPORT
   933  }
   934  
   935  func Socket(domain, typ, proto int) (fd Handle, err error) {
   936  	if domain == AF_INET6 && SocketDisableIPv6 {
   937  		return InvalidHandle, EAFNOSUPPORT
   938  	}
   939  	return socket(int32(domain), int32(typ), int32(proto))
   940  }
   941  
   942  func SetsockoptInt(fd Handle, level, opt int, value int) (err error) {
   943  	v := int32(value)
   944  	return Setsockopt(fd, int32(level), int32(opt), (*byte)(unsafe.Pointer(&v)), int32(unsafe.Sizeof(v)))
   945  }
   946  
   947  func Bind(fd Handle, sa Sockaddr) (err error) {
   948  	ptr, n, err := sa.sockaddr()
   949  	if err != nil {
   950  		return err
   951  	}
   952  	return bind(fd, ptr, n)
   953  }
   954  
   955  func Connect(fd Handle, sa Sockaddr) (err error) {
   956  	ptr, n, err := sa.sockaddr()
   957  	if err != nil {
   958  		return err
   959  	}
   960  	return connect(fd, ptr, n)
   961  }
   962  
   963  func Getsockname(fd Handle) (sa Sockaddr, err error) {
   964  	var rsa RawSockaddrAny
   965  	l := int32(unsafe.Sizeof(rsa))
   966  	if err = getsockname(fd, &rsa, &l); err != nil {
   967  		return
   968  	}
   969  	return rsa.Sockaddr()
   970  }
   971  
   972  func Getpeername(fd Handle) (sa Sockaddr, err error) {
   973  	var rsa RawSockaddrAny
   974  	l := int32(unsafe.Sizeof(rsa))
   975  	if err = getpeername(fd, &rsa, &l); err != nil {
   976  		return
   977  	}
   978  	return rsa.Sockaddr()
   979  }
   980  
   981  func Listen(s Handle, n int) (err error) {
   982  	return listen(s, int32(n))
   983  }
   984  
   985  func Shutdown(fd Handle, how int) (err error) {
   986  	return shutdown(fd, int32(how))
   987  }
   988  
   989  func WSASendto(s Handle, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, to Sockaddr, overlapped *Overlapped, croutine *byte) (err error) {
   990  	var rsa unsafe.Pointer
   991  	var len int32
   992  	if to != nil {
   993  		rsa, len, err = to.sockaddr()
   994  		if err != nil {
   995  			return err
   996  		}
   997  	}
   998  	r1, _, e1 := Syscall9(procWSASendTo.Addr(), 9, uintptr(s), uintptr(unsafe.Pointer(bufs)), uintptr(bufcnt), uintptr(unsafe.Pointer(sent)), uintptr(flags), uintptr(unsafe.Pointer(rsa)), uintptr(len), uintptr(unsafe.Pointer(overlapped)), uintptr(unsafe.Pointer(croutine)))
   999  	if r1 == socket_error {
  1000  		if e1 != 0 {
  1001  			err = errnoErr(e1)
  1002  		} else {
  1003  			err = EINVAL
  1004  		}
  1005  	}
  1006  	return err
  1007  }
  1008  
  1009  func wsaSendtoInet4(s Handle, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, to *SockaddrInet4, overlapped *Overlapped, croutine *byte) (err error) {
  1010  	rsa, len, err := to.sockaddr()
  1011  	if err != nil {
  1012  		return err
  1013  	}
  1014  	r1, _, e1 := Syscall9(procWSASendTo.Addr(), 9, uintptr(s), uintptr(unsafe.Pointer(bufs)), uintptr(bufcnt), uintptr(unsafe.Pointer(sent)), uintptr(flags), uintptr(unsafe.Pointer(rsa)), uintptr(len), uintptr(unsafe.Pointer(overlapped)), uintptr(unsafe.Pointer(croutine)))
  1015  	if r1 == socket_error {
  1016  		if e1 != 0 {
  1017  			err = errnoErr(e1)
  1018  		} else {
  1019  			err = EINVAL
  1020  		}
  1021  	}
  1022  	return err
  1023  }
  1024  
  1025  func wsaSendtoInet6(s Handle, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, to *SockaddrInet6, overlapped *Overlapped, croutine *byte) (err error) {
  1026  	rsa, len, err := to.sockaddr()
  1027  	if err != nil {
  1028  		return err
  1029  	}
  1030  	r1, _, e1 := Syscall9(procWSASendTo.Addr(), 9, uintptr(s), uintptr(unsafe.Pointer(bufs)), uintptr(bufcnt), uintptr(unsafe.Pointer(sent)), uintptr(flags), uintptr(unsafe.Pointer(rsa)), uintptr(len), uintptr(unsafe.Pointer(overlapped)), uintptr(unsafe.Pointer(croutine)))
  1031  	if r1 == socket_error {
  1032  		if e1 != 0 {
  1033  			err = errnoErr(e1)
  1034  		} else {
  1035  			err = EINVAL
  1036  		}
  1037  	}
  1038  	return err
  1039  }
  1040  
  1041  func LoadGetAddrInfo() error {
  1042  	return procGetAddrInfoW.Find()
  1043  }
  1044  
  1045  var connectExFunc struct {
  1046  	once sync.Once
  1047  	addr uintptr
  1048  	err  error
  1049  }
  1050  
  1051  func LoadConnectEx() error {
  1052  	connectExFunc.once.Do(func() {
  1053  		var s Handle
  1054  		s, connectExFunc.err = Socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)
  1055  		if connectExFunc.err != nil {
  1056  			return
  1057  		}
  1058  		defer CloseHandle(s)
  1059  		var n uint32
  1060  		connectExFunc.err = WSAIoctl(s,
  1061  			SIO_GET_EXTENSION_FUNCTION_POINTER,
  1062  			(*byte)(unsafe.Pointer(&WSAID_CONNECTEX)),
  1063  			uint32(unsafe.Sizeof(WSAID_CONNECTEX)),
  1064  			(*byte)(unsafe.Pointer(&connectExFunc.addr)),
  1065  			uint32(unsafe.Sizeof(connectExFunc.addr)),
  1066  			&n, nil, 0)
  1067  	})
  1068  	return connectExFunc.err
  1069  }
  1070  
  1071  func connectEx(s Handle, name unsafe.Pointer, namelen int32, sendBuf *byte, sendDataLen uint32, bytesSent *uint32, overlapped *Overlapped) (err error) {
  1072  	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)
  1073  	if r1 == 0 {
  1074  		if e1 != 0 {
  1075  			err = error(e1)
  1076  		} else {
  1077  			err = EINVAL
  1078  		}
  1079  	}
  1080  	return
  1081  }
  1082  
  1083  func ConnectEx(fd Handle, sa Sockaddr, sendBuf *byte, sendDataLen uint32, bytesSent *uint32, overlapped *Overlapped) error {
  1084  	err := LoadConnectEx()
  1085  	if err != nil {
  1086  		return errorspkg.New("failed to find ConnectEx: " + err.Error())
  1087  	}
  1088  	ptr, n, err := sa.sockaddr()
  1089  	if err != nil {
  1090  		return err
  1091  	}
  1092  	return connectEx(fd, ptr, n, sendBuf, sendDataLen, bytesSent, overlapped)
  1093  }
  1094  
  1095  // Invented structures to support what package os expects.
  1096  type Rusage struct {
  1097  	CreationTime Filetime
  1098  	ExitTime     Filetime
  1099  	KernelTime   Filetime
  1100  	UserTime     Filetime
  1101  }
  1102  
  1103  type WaitStatus struct {
  1104  	ExitCode uint32
  1105  }
  1106  
  1107  func (w WaitStatus) Exited() bool { return true }
  1108  
  1109  func (w WaitStatus) ExitStatus() int { return int(w.ExitCode) }
  1110  
  1111  func (w WaitStatus) Signal() Signal { return -1 }
  1112  
  1113  func (w WaitStatus) CoreDump() bool { return false }
  1114  
  1115  func (w WaitStatus) Stopped() bool { return false }
  1116  
  1117  func (w WaitStatus) Continued() bool { return false }
  1118  
  1119  func (w WaitStatus) StopSignal() Signal { return -1 }
  1120  
  1121  func (w WaitStatus) Signaled() bool { return false }
  1122  
  1123  func (w WaitStatus) TrapCause() int { return -1 }
  1124  
  1125  // Timespec is an invented structure on Windows, but here for
  1126  // consistency with the syscall package for other operating systems.
  1127  type Timespec struct {
  1128  	Sec  int64
  1129  	Nsec int64
  1130  }
  1131  
  1132  func TimespecToNsec(ts Timespec) int64 { return int64(ts.Sec)*1e9 + int64(ts.Nsec) }
  1133  
  1134  func NsecToTimespec(nsec int64) (ts Timespec) {
  1135  	ts.Sec = nsec / 1e9
  1136  	ts.Nsec = nsec % 1e9
  1137  	return
  1138  }
  1139  
  1140  // TODO(brainman): fix all needed for net
  1141  
  1142  func Accept(fd Handle) (nfd Handle, sa Sockaddr, err error) { return 0, nil, EWINDOWS }
  1143  func Recvfrom(fd Handle, p []byte, flags int) (n int, from Sockaddr, err error) {
  1144  	return 0, nil, EWINDOWS
  1145  }
  1146  func Sendto(fd Handle, p []byte, flags int, to Sockaddr) (err error)       { return EWINDOWS }
  1147  func SetsockoptTimeval(fd Handle, level, opt int, tv *Timeval) (err error) { return EWINDOWS }
  1148  
  1149  // The Linger struct is wrong but we only noticed after Go 1.
  1150  // sysLinger is the real system call structure.
  1151  
  1152  // BUG(brainman): The definition of Linger is not appropriate for direct use
  1153  // with Setsockopt and Getsockopt.
  1154  // Use SetsockoptLinger instead.
  1155  
  1156  type Linger struct {
  1157  	Onoff  int32
  1158  	Linger int32
  1159  }
  1160  
  1161  type sysLinger struct {
  1162  	Onoff  uint16
  1163  	Linger uint16
  1164  }
  1165  
  1166  type IPMreq struct {
  1167  	Multiaddr [4]byte /* in_addr */
  1168  	Interface [4]byte /* in_addr */
  1169  }
  1170  
  1171  type IPv6Mreq struct {
  1172  	Multiaddr [16]byte /* in6_addr */
  1173  	Interface uint32
  1174  }
  1175  
  1176  func GetsockoptInt(fd Handle, level, opt int) (int, error) {
  1177  	optval := int32(0)
  1178  	optlen := int32(unsafe.Sizeof(optval))
  1179  	err := Getsockopt(fd, int32(level), int32(opt), (*byte)(unsafe.Pointer(&optval)), &optlen)
  1180  	return int(optval), err
  1181  }
  1182  
  1183  func SetsockoptLinger(fd Handle, level, opt int, l *Linger) (err error) {
  1184  	sys := sysLinger{Onoff: uint16(l.Onoff), Linger: uint16(l.Linger)}
  1185  	return Setsockopt(fd, int32(level), int32(opt), (*byte)(unsafe.Pointer(&sys)), int32(unsafe.Sizeof(sys)))
  1186  }
  1187  
  1188  func SetsockoptInet4Addr(fd Handle, level, opt int, value [4]byte) (err error) {
  1189  	return Setsockopt(fd, int32(level), int32(opt), (*byte)(unsafe.Pointer(&value[0])), 4)
  1190  }
  1191  func SetsockoptIPMreq(fd Handle, level, opt int, mreq *IPMreq) (err error) {
  1192  	return Setsockopt(fd, int32(level), int32(opt), (*byte)(unsafe.Pointer(mreq)), int32(unsafe.Sizeof(*mreq)))
  1193  }
  1194  func SetsockoptIPv6Mreq(fd Handle, level, opt int, mreq *IPv6Mreq) (err error) { return EWINDOWS }
  1195  
  1196  func Getpid() (pid int) { return int(getCurrentProcessId()) }
  1197  
  1198  func FindFirstFile(name *uint16, data *Win32finddata) (handle Handle, err error) {
  1199  	// NOTE(rsc): The Win32finddata struct is wrong for the system call:
  1200  	// the two paths are each one uint16 short. Use the correct struct,
  1201  	// a win32finddata1, and then copy the results out.
  1202  	// There is no loss of expressivity here, because the final
  1203  	// uint16, if it is used, is supposed to be a NUL, and Go doesn't need that.
  1204  	// For Go 1.1, we might avoid the allocation of win32finddata1 here
  1205  	// by adding a final Bug [2]uint16 field to the struct and then
  1206  	// adjusting the fields in the result directly.
  1207  	var data1 win32finddata1
  1208  	handle, err = findFirstFile1(name, &data1)
  1209  	if err == nil {
  1210  		copyFindData(data, &data1)
  1211  	}
  1212  	return
  1213  }
  1214  
  1215  func FindNextFile(handle Handle, data *Win32finddata) (err error) {
  1216  	var data1 win32finddata1
  1217  	err = findNextFile1(handle, &data1)
  1218  	if err == nil {
  1219  		copyFindData(data, &data1)
  1220  	}
  1221  	return
  1222  }
  1223  
  1224  func getProcessEntry(pid int) (*ProcessEntry32, error) {
  1225  	snapshot, err := CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0)
  1226  	if err != nil {
  1227  		return nil, err
  1228  	}
  1229  	defer CloseHandle(snapshot)
  1230  	var procEntry ProcessEntry32
  1231  	procEntry.Size = uint32(unsafe.Sizeof(procEntry))
  1232  	if err = Process32First(snapshot, &procEntry); err != nil {
  1233  		return nil, err
  1234  	}
  1235  	for {
  1236  		if procEntry.ProcessID == uint32(pid) {
  1237  			return &procEntry, nil
  1238  		}
  1239  		err = Process32Next(snapshot, &procEntry)
  1240  		if err != nil {
  1241  			return nil, err
  1242  		}
  1243  	}
  1244  }
  1245  
  1246  func Getppid() (ppid int) {
  1247  	pe, err := getProcessEntry(Getpid())
  1248  	if err != nil {
  1249  		return -1
  1250  	}
  1251  	return int(pe.ParentProcessID)
  1252  }
  1253  
  1254  func fdpath(fd Handle, buf []uint16) ([]uint16, error) {
  1255  	const (
  1256  		FILE_NAME_NORMALIZED = 0
  1257  		VOLUME_NAME_DOS      = 0
  1258  	)
  1259  	for {
  1260  		n, err := getFinalPathNameByHandle(fd, &buf[0], uint32(len(buf)), FILE_NAME_NORMALIZED|VOLUME_NAME_DOS)
  1261  		if err == nil {
  1262  			buf = buf[:n]
  1263  			break
  1264  		}
  1265  		if err != _ERROR_NOT_ENOUGH_MEMORY {
  1266  			return nil, err
  1267  		}
  1268  		buf = append(buf, make([]uint16, n-uint32(len(buf)))...)
  1269  	}
  1270  	return buf, nil
  1271  }
  1272  
  1273  func Fchdir(fd Handle) (err error) {
  1274  	var buf [MAX_PATH + 1]uint16
  1275  	path, err := fdpath(fd, buf[:])
  1276  	if err != nil {
  1277  		return err
  1278  	}
  1279  	// When using VOLUME_NAME_DOS, the path is always prefixed by "\\?\".
  1280  	// That prefix tells the Windows APIs to disable all string parsing and to send
  1281  	// the string that follows it straight to the file system.
  1282  	// Although SetCurrentDirectory and GetCurrentDirectory do support the "\\?\" prefix,
  1283  	// some other Windows APIs don't. If the prefix is not removed here, it will leak
  1284  	// to Getwd, and we don't want such a general-purpose function to always return a
  1285  	// path with the "\\?\" prefix after Fchdir is called.
  1286  	// The downside is that APIs that do support it will parse the path and try to normalize it,
  1287  	// when it's already normalized.
  1288  	if len(path) >= 4 && path[0] == '\\' && path[1] == '\\' && path[2] == '?' && path[3] == '\\' {
  1289  		path = path[4:]
  1290  	}
  1291  	return SetCurrentDirectory(&path[0])
  1292  }
  1293  
  1294  // TODO(brainman): fix all needed for os
  1295  func Link(oldpath, newpath string) (err error) { return EWINDOWS }
  1296  func Symlink(path, link string) (err error)    { return EWINDOWS }
  1297  
  1298  func Fchmod(fd Handle, mode uint32) (err error)        { return EWINDOWS }
  1299  func Chown(path string, uid int, gid int) (err error)  { return EWINDOWS }
  1300  func Lchown(path string, uid int, gid int) (err error) { return EWINDOWS }
  1301  func Fchown(fd Handle, uid int, gid int) (err error)   { return EWINDOWS }
  1302  
  1303  func Getuid() (uid int)                  { return -1 }
  1304  func Geteuid() (euid int)                { return -1 }
  1305  func Getgid() (gid int)                  { return -1 }
  1306  func Getegid() (egid int)                { return -1 }
  1307  func Getgroups() (gids []int, err error) { return nil, EWINDOWS }
  1308  
  1309  type Signal int
  1310  
  1311  func (s Signal) Signal() {}
  1312  
  1313  func (s Signal) String() string {
  1314  	if 0 <= s && int(s) < len(signals) {
  1315  		str := signals[s]
  1316  		if str != "" {
  1317  			return str
  1318  		}
  1319  	}
  1320  	return "signal " + itoa.Itoa(int(s))
  1321  }
  1322  
  1323  func LoadCreateSymbolicLink() error {
  1324  	return procCreateSymbolicLinkW.Find()
  1325  }
  1326  
  1327  // Readlink returns the destination of the named symbolic link.
  1328  func Readlink(path string, buf []byte) (n int, err error) {
  1329  	fd, err := CreateFile(StringToUTF16Ptr(path), GENERIC_READ, 0, nil, OPEN_EXISTING,
  1330  		FILE_FLAG_OPEN_REPARSE_POINT|FILE_FLAG_BACKUP_SEMANTICS, 0)
  1331  	if err != nil {
  1332  		return -1, err
  1333  	}
  1334  	defer CloseHandle(fd)
  1335  
  1336  	rdbbuf := make([]byte, MAXIMUM_REPARSE_DATA_BUFFER_SIZE)
  1337  	var bytesReturned uint32
  1338  	err = DeviceIoControl(fd, FSCTL_GET_REPARSE_POINT, nil, 0, &rdbbuf[0], uint32(len(rdbbuf)), &bytesReturned, nil)
  1339  	if err != nil {
  1340  		return -1, err
  1341  	}
  1342  
  1343  	rdb := (*reparseDataBuffer)(unsafe.Pointer(&rdbbuf[0]))
  1344  	var s string
  1345  	switch rdb.ReparseTag {
  1346  	case IO_REPARSE_TAG_SYMLINK:
  1347  		data := (*symbolicLinkReparseBuffer)(unsafe.Pointer(&rdb.reparseBuffer))
  1348  		p := (*[0xffff]uint16)(unsafe.Pointer(&data.PathBuffer[0]))
  1349  		s = UTF16ToString(p[data.SubstituteNameOffset/2 : (data.SubstituteNameOffset+data.SubstituteNameLength)/2])
  1350  		if data.Flags&_SYMLINK_FLAG_RELATIVE == 0 {
  1351  			if len(s) >= 4 && s[:4] == `\??\` {
  1352  				s = s[4:]
  1353  				switch {
  1354  				case len(s) >= 2 && s[1] == ':': // \??\C:\foo\bar
  1355  					// do nothing
  1356  				case len(s) >= 4 && s[:4] == `UNC\`: // \??\UNC\foo\bar
  1357  					s = `\\` + s[4:]
  1358  				default:
  1359  					// unexpected; do nothing
  1360  				}
  1361  			} else {
  1362  				// unexpected; do nothing
  1363  			}
  1364  		}
  1365  	case _IO_REPARSE_TAG_MOUNT_POINT:
  1366  		data := (*mountPointReparseBuffer)(unsafe.Pointer(&rdb.reparseBuffer))
  1367  		p := (*[0xffff]uint16)(unsafe.Pointer(&data.PathBuffer[0]))
  1368  		s = UTF16ToString(p[data.SubstituteNameOffset/2 : (data.SubstituteNameOffset+data.SubstituteNameLength)/2])
  1369  		if len(s) >= 4 && s[:4] == `\??\` { // \??\C:\foo\bar
  1370  			s = s[4:]
  1371  		} else {
  1372  			// unexpected; do nothing
  1373  		}
  1374  	default:
  1375  		// the path is not a symlink or junction but another type of reparse
  1376  		// point
  1377  		return -1, ENOENT
  1378  	}
  1379  	n = copy(buf, []byte(s))
  1380  
  1381  	return n, nil
  1382  }
  1383  
  1384  // Deprecated: CreateIoCompletionPort has the wrong function signature. Use x/sys/windows.CreateIoCompletionPort.
  1385  func CreateIoCompletionPort(filehandle Handle, cphandle Handle, key uint32, threadcnt uint32) (Handle, error) {
  1386  	return createIoCompletionPort(filehandle, cphandle, uintptr(key), threadcnt)
  1387  }
  1388  
  1389  // Deprecated: GetQueuedCompletionStatus has the wrong function signature. Use x/sys/windows.GetQueuedCompletionStatus.
  1390  func GetQueuedCompletionStatus(cphandle Handle, qty *uint32, key *uint32, overlapped **Overlapped, timeout uint32) error {
  1391  	var ukey uintptr
  1392  	var pukey *uintptr
  1393  	if key != nil {
  1394  		ukey = uintptr(*key)
  1395  		pukey = &ukey
  1396  	}
  1397  	err := getQueuedCompletionStatus(cphandle, qty, pukey, overlapped, timeout)
  1398  	if key != nil {
  1399  		*key = uint32(ukey)
  1400  		if uintptr(*key) != ukey && err == nil {
  1401  			err = errorspkg.New("GetQueuedCompletionStatus returned key overflow")
  1402  		}
  1403  	}
  1404  	return err
  1405  }
  1406  
  1407  // Deprecated: PostQueuedCompletionStatus has the wrong function signature. Use x/sys/windows.PostQueuedCompletionStatus.
  1408  func PostQueuedCompletionStatus(cphandle Handle, qty uint32, key uint32, overlapped *Overlapped) error {
  1409  	return postQueuedCompletionStatus(cphandle, qty, uintptr(key), overlapped)
  1410  }
  1411  
  1412  // newProcThreadAttributeList allocates new PROC_THREAD_ATTRIBUTE_LIST, with
  1413  // the requested maximum number of attributes, which must be cleaned up by
  1414  // deleteProcThreadAttributeList.
  1415  func newProcThreadAttributeList(maxAttrCount uint32) (*_PROC_THREAD_ATTRIBUTE_LIST, error) {
  1416  	var size uintptr
  1417  	err := initializeProcThreadAttributeList(nil, maxAttrCount, 0, &size)
  1418  	if err != ERROR_INSUFFICIENT_BUFFER {
  1419  		if err == nil {
  1420  			return nil, errorspkg.New("unable to query buffer size from InitializeProcThreadAttributeList")
  1421  		}
  1422  		return nil, err
  1423  	}
  1424  	// size is guaranteed to be ≥1 by initializeProcThreadAttributeList.
  1425  	al := (*_PROC_THREAD_ATTRIBUTE_LIST)(unsafe.Pointer(&make([]byte, size)[0]))
  1426  	err = initializeProcThreadAttributeList(al, maxAttrCount, 0, &size)
  1427  	if err != nil {
  1428  		return nil, err
  1429  	}
  1430  	return al, nil
  1431  }
  1432  
  1433  // RegEnumKeyEx enumerates the subkeys of an open registry key.
  1434  // Each call retrieves information about one subkey. name is
  1435  // a buffer that should be large enough to hold the name of the
  1436  // subkey plus a null terminating character. nameLen is its
  1437  // length. On return, nameLen will contain the actual length of the
  1438  // subkey.
  1439  //
  1440  // Should name not be large enough to hold the subkey, this function
  1441  // will return ERROR_MORE_DATA, and must be called again with an
  1442  // appropriately sized buffer.
  1443  //
  1444  // reserved must be nil. class and classLen behave like name and nameLen
  1445  // but for the class of the subkey, except that they are optional.
  1446  // lastWriteTime, if not nil, will be populated with the time the subkey
  1447  // was last written.
  1448  //
  1449  // The caller must enumerate all subkeys in order. That is
  1450  // RegEnumKeyEx must be called with index starting at 0, incrementing
  1451  // the index until the function returns ERROR_NO_MORE_ITEMS, or with
  1452  // the index of the last subkey (obtainable from RegQueryInfoKey),
  1453  // decrementing until index 0 is enumerated.
  1454  //
  1455  // Successive calls to this API must happen on the same OS thread,
  1456  // so call [runtime.LockOSThread] before calling this function.
  1457  func RegEnumKeyEx(key Handle, index uint32, name *uint16, nameLen *uint32, reserved *uint32, class *uint16, classLen *uint32, lastWriteTime *Filetime) (regerrno error) {
  1458  	return regEnumKeyEx(key, index, name, nameLen, reserved, class, classLen, lastWriteTime)
  1459  }
  1460  
  1461  func GetStartupInfo(startupInfo *StartupInfo) error {
  1462  	getStartupInfo(startupInfo)
  1463  	return nil
  1464  }
  1465  
  1466  func CreateFile(name *uint16, access uint32, mode uint32, sa *SecurityAttributes, createmode uint32, attrs uint32, templatefile int32) (handle Handle, err error) {
  1467  	handle, err = createFile(name, access, mode, sa, createmode, attrs, templatefile)
  1468  	if handle != InvalidHandle {
  1469  		// CreateFileW can return ERROR_ALREADY_EXISTS with a valid handle.
  1470  		// We only want to return an error if the handle is invalid.
  1471  		err = nil
  1472  	}
  1473  	return handle, err
  1474  }
  1475  

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