// 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/oserror"
"internal/race"
"runtime"
"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]))
}
const _ERROR_BAD_NETPATH = Errno(53)
func (e Errno) Is(target error) bool {
switch target {
case oserror.ErrPermission:
return e == ERROR_ACCESS_DENIED
case oserror.ErrExist:
return e == ERROR_ALREADY_EXISTS ||
e == ERROR_DIR_NOT_EMPTY ||
e == ERROR_FILE_EXISTS
case oserror.ErrNotExist:
return e == ERROR_FILE_NOT_FOUND ||
e == _ERROR_BAD_NETPATH ||
e == ERROR_PATH_NOT_FOUND
}
return false
}
func (e Errno) Temporary() bool {
return e == EINTR || e == EMFILE || 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
// NewCallback converts a Go function to a function pointer conforming to the stdcall calling convention.
// This is useful when interoperating with Windows code requiring callbacks.
// 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.
func NewCallback(fn interface{}) uintptr {
return compileCallback(fn, true)
}
// NewCallbackCDecl converts a Go function to a function pointer conforming to the cdecl calling convention.
// This is useful when interoperating with Windows code requiring callbacks.
// 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.
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 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
//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
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
var procSetFilePointerEx = modkernel32.NewProc("SetFilePointerEx")
const ptrSize = unsafe.Sizeof(uintptr(0))
// setFilePointerEx calls SetFilePointerEx.
// See https://msdn.microsoft.com/en-us/library/windows/desktop/aa365542(v=vs.85).aspx
func setFilePointerEx(handle Handle, distToMove int64, newFilePointer *int64, whence uint32) error {
var e1 Errno
switch runtime.GOARCH {
default:
panic("unsupported architecture")
case "amd64":
_, _, e1 = Syscall6(procSetFilePointerEx.Addr(), 4, uintptr(handle), uintptr(distToMove), uintptr(unsafe.Pointer(newFilePointer)), uintptr(whence), 0, 0)
case "386":
// distToMove is a LARGE_INTEGER:
// https://msdn.microsoft.com/en-us/library/windows/desktop/aa383713(v=vs.85).aspx
_, _, e1 = Syscall6(procSetFilePointerEx.Addr(), 5, uintptr(handle), uintptr(distToMove), uintptr(distToMove>>32), uintptr(unsafe.Pointer(newFilePointer)), uintptr(whence), 0)
case "arm":
// distToMove must be 8-byte aligned per ARM calling convention
// https://msdn.microsoft.com/en-us/library/dn736986.aspx#Anchor_7
_, _, e1 = Syscall6(procSetFilePointerEx.Addr(), 6, uintptr(handle), 0, uintptr(distToMove), uintptr(distToMove>>32), uintptr(unsafe.Pointer(newFilePointer)), uintptr(whence))
}
if e1 != 0 {
return errnoErr(e1)
}
return nil
}
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
}
// use GetFileType to check pipe, pipe can't do seek
ft, _ := GetFileType(fd)
if ft == FILE_TYPE_PIPE {
return 0, ESPIPE
}
err = setFilePointerEx(fd, offset, &newoffset, w)
return
}
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) {
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 [100]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 RawSockaddrUnix struct {
Family uint16
Path [UNIX_PATH_MAX]int8
}
type SockaddrUnix struct {
Name string
raw RawSockaddrUnix
}
func (sa *SockaddrUnix) sockaddr() (unsafe.Pointer, int32, error) {
name := sa.Name
n := len(name)
if n > len(sa.raw.Path) {
return nil, 0, EINVAL
}
if n == len(sa.raw.Path) && name[0] != '@' {
return nil, 0, EINVAL
}
sa.raw.Family = AF_UNIX
for i := 0; i < n; i++ {
sa.raw.Path[i] = int8(name[i])
}
// length is family (uint16), name, NUL.
sl := int32(2)
if n > 0 {
sl += int32(n) + 1
}
if sa.raw.Path[0] == '@' {
sa.raw.Path[0] = 0
// Don't count trailing NUL for abstract address.
sl--
}
return unsafe.Pointer(&sa.raw), sl, nil
}
func (rsa *RawSockaddrAny) Sockaddr() (Sockaddr, error) {
switch rsa.Addr.Family {
case AF_UNIX:
pp := (*RawSockaddrUnix)(unsafe.Pointer(rsa))
sa := new(SockaddrUnix)
if pp.Path[0] == 0 {
// "Abstract" Unix domain socket.
// Rewrite leading NUL as @ for textual display.
// (This is the standard convention.)
// Not friendly to overwrite in place,
// but the callers below don't care.
pp.Path[0] = '@'
}
// Assume path ends at NUL.
// This is not technically the Linux semantics for
// abstract Unix domain sockets--they are supposed
// to be uninterpreted fixed-size binary blobs--but
// everyone uses this convention.
n := 0
for n < len(pp.Path) && pp.Path[n] != 0 {
n++
}
bytes := (*[10000]byte)(unsafe.Pointer(&pp.Path[0]))[0:n]
sa.Name = string(bytes)
return sa, nil
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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