github.com/peggyl/go@v0.0.0-20151008231540-ae315999c2d5/src/syscall/syscall_windows.go (about) 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 "sync" 12 "unicode/utf16" 13 "unsafe" 14 ) 15 16 //go:generate go run mksyscall_windows.go -output zsyscall_windows.go syscall_windows.go security_windows.go 17 18 type Handle uintptr 19 20 const InvalidHandle = ^Handle(0) 21 22 // StringToUTF16 returns the UTF-16 encoding of the UTF-8 string s, 23 // with a terminating NUL added. If s contains a NUL byte this 24 // function panics instead of returning an error. 25 // 26 // Deprecated: Use UTF16FromString instead. 27 func StringToUTF16(s string) []uint16 { 28 a, err := UTF16FromString(s) 29 if err != nil { 30 panic("syscall: string with NUL passed to StringToUTF16") 31 } 32 return a 33 } 34 35 // UTF16FromString returns the UTF-16 encoding of the UTF-8 string 36 // s, with a terminating NUL added. If s contains a NUL byte at any 37 // location, it returns (nil, EINVAL). 38 func UTF16FromString(s string) ([]uint16, error) { 39 for i := 0; i < len(s); i++ { 40 if s[i] == 0 { 41 return nil, EINVAL 42 } 43 } 44 return utf16.Encode([]rune(s + "\x00")), nil 45 } 46 47 // UTF16ToString returns the UTF-8 encoding of the UTF-16 sequence s, 48 // with a terminating NUL removed. 49 func UTF16ToString(s []uint16) string { 50 for i, v := range s { 51 if v == 0 { 52 s = s[0:i] 53 break 54 } 55 } 56 return string(utf16.Decode(s)) 57 } 58 59 // StringToUTF16Ptr returns pointer to the UTF-16 encoding of 60 // the UTF-8 string s, with a terminating NUL added. If s 61 // If s contains a NUL byte this function panics instead of 62 // returning an error. 63 // 64 // Deprecated: Use UTF16PtrFromString instead. 65 func StringToUTF16Ptr(s string) *uint16 { return &StringToUTF16(s)[0] } 66 67 // UTF16PtrFromString returns pointer to the UTF-16 encoding of 68 // the UTF-8 string s, with a terminating NUL added. If s 69 // contains a NUL byte at any location, it returns (nil, EINVAL). 70 func UTF16PtrFromString(s string) (*uint16, error) { 71 a, err := UTF16FromString(s) 72 if err != nil { 73 return nil, err 74 } 75 return &a[0], nil 76 } 77 78 func Getpagesize() int { return 4096 } 79 80 // Errno is the Windows error number. 81 type Errno uintptr 82 83 func langid(pri, sub uint16) uint32 { return uint32(sub)<<10 | uint32(pri) } 84 85 // FormatMessage is deprecated (msgsrc should be uintptr, not uint32, but can 86 // not be changed due to the Go 1 compatibility guarantee). 87 // 88 // Deprecated: Use FormatMessage from golang.org/x/sys/windows instead. 89 func FormatMessage(flags uint32, msgsrc uint32, msgid uint32, langid uint32, buf []uint16, args *byte) (n uint32, err error) { 90 return formatMessage(flags, uintptr(msgsrc), msgid, langid, buf, args) 91 } 92 93 func (e Errno) Error() string { 94 // deal with special go errors 95 idx := int(e - APPLICATION_ERROR) 96 if 0 <= idx && idx < len(errors) { 97 return errors[idx] 98 } 99 // ask windows for the remaining errors 100 var flags uint32 = FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ARGUMENT_ARRAY | FORMAT_MESSAGE_IGNORE_INSERTS 101 b := make([]uint16, 300) 102 n, err := formatMessage(flags, 0, uint32(e), langid(LANG_ENGLISH, SUBLANG_ENGLISH_US), b, nil) 103 if err != nil { 104 n, err = formatMessage(flags, 0, uint32(e), 0, b, nil) 105 if err != nil { 106 return "winapi error #" + itoa(int(e)) 107 } 108 } 109 // trim terminating \r and \n 110 for ; n > 0 && (b[n-1] == '\n' || b[n-1] == '\r'); n-- { 111 } 112 return string(utf16.Decode(b[:n])) 113 } 114 115 func (e Errno) Temporary() bool { 116 return e == EINTR || e == EMFILE || e.Timeout() 117 } 118 119 func (e Errno) Timeout() bool { 120 return e == EAGAIN || e == EWOULDBLOCK || e == ETIMEDOUT 121 } 122 123 // Implemented in runtime/syscall_windows.go. 124 func compileCallback(fn interface{}, cleanstack bool) uintptr 125 126 // Converts a Go function to a function pointer conforming 127 // to the stdcall calling convention. This is useful when 128 // interoperating with Windows code requiring callbacks. 129 func NewCallback(fn interface{}) uintptr { 130 return compileCallback(fn, true) 131 } 132 133 // Converts a Go function to a function pointer conforming 134 // to the cdecl calling convention. This is useful when 135 // interoperating with Windows code requiring callbacks. 136 func NewCallbackCDecl(fn interface{}) uintptr { 137 return compileCallback(fn, false) 138 } 139 140 // windows api calls 141 142 //sys GetLastError() (lasterr error) 143 //sys LoadLibrary(libname string) (handle Handle, err error) = LoadLibraryW 144 //sys FreeLibrary(handle Handle) (err error) 145 //sys GetProcAddress(module Handle, procname string) (proc uintptr, err error) 146 //sys GetVersion() (ver uint32, err error) 147 //sys formatMessage(flags uint32, msgsrc uintptr, msgid uint32, langid uint32, buf []uint16, args *byte) (n uint32, err error) = FormatMessageW 148 //sys ExitProcess(exitcode uint32) 149 //sys CreateFile(name *uint16, access uint32, mode uint32, sa *SecurityAttributes, createmode uint32, attrs uint32, templatefile int32) (handle Handle, err error) [failretval==InvalidHandle] = CreateFileW 150 //sys ReadFile(handle Handle, buf []byte, done *uint32, overlapped *Overlapped) (err error) 151 //sys WriteFile(handle Handle, buf []byte, done *uint32, overlapped *Overlapped) (err error) 152 //sys SetFilePointer(handle Handle, lowoffset int32, highoffsetptr *int32, whence uint32) (newlowoffset uint32, err error) [failretval==0xffffffff] 153 //sys CloseHandle(handle Handle) (err error) 154 //sys GetStdHandle(stdhandle int) (handle Handle, err error) [failretval==InvalidHandle] 155 //sys findFirstFile1(name *uint16, data *win32finddata1) (handle Handle, err error) [failretval==InvalidHandle] = FindFirstFileW 156 //sys findNextFile1(handle Handle, data *win32finddata1) (err error) = FindNextFileW 157 //sys FindClose(handle Handle) (err error) 158 //sys GetFileInformationByHandle(handle Handle, data *ByHandleFileInformation) (err error) 159 //sys GetCurrentDirectory(buflen uint32, buf *uint16) (n uint32, err error) = GetCurrentDirectoryW 160 //sys SetCurrentDirectory(path *uint16) (err error) = SetCurrentDirectoryW 161 //sys CreateDirectory(path *uint16, sa *SecurityAttributes) (err error) = CreateDirectoryW 162 //sys RemoveDirectory(path *uint16) (err error) = RemoveDirectoryW 163 //sys DeleteFile(path *uint16) (err error) = DeleteFileW 164 //sys MoveFile(from *uint16, to *uint16) (err error) = MoveFileW 165 //sys GetComputerName(buf *uint16, n *uint32) (err error) = GetComputerNameW 166 //sys SetEndOfFile(handle Handle) (err error) 167 //sys GetSystemTimeAsFileTime(time *Filetime) 168 //sys GetTimeZoneInformation(tzi *Timezoneinformation) (rc uint32, err error) [failretval==0xffffffff] 169 //sys CreateIoCompletionPort(filehandle Handle, cphandle Handle, key uint32, threadcnt uint32) (handle Handle, err error) 170 //sys GetQueuedCompletionStatus(cphandle Handle, qty *uint32, key *uint32, overlapped **Overlapped, timeout uint32) (err error) 171 //sys PostQueuedCompletionStatus(cphandle Handle, qty uint32, key uint32, overlapped *Overlapped) (err error) 172 //sys CancelIo(s Handle) (err error) 173 //sys CancelIoEx(s Handle, o *Overlapped) (err error) 174 //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 175 //sys OpenProcess(da uint32, inheritHandle bool, pid uint32) (handle Handle, err error) 176 //sys TerminateProcess(handle Handle, exitcode uint32) (err error) 177 //sys GetExitCodeProcess(handle Handle, exitcode *uint32) (err error) 178 //sys GetStartupInfo(startupInfo *StartupInfo) (err error) = GetStartupInfoW 179 //sys GetCurrentProcess() (pseudoHandle Handle, err error) 180 //sys GetProcessTimes(handle Handle, creationTime *Filetime, exitTime *Filetime, kernelTime *Filetime, userTime *Filetime) (err error) 181 //sys DuplicateHandle(hSourceProcessHandle Handle, hSourceHandle Handle, hTargetProcessHandle Handle, lpTargetHandle *Handle, dwDesiredAccess uint32, bInheritHandle bool, dwOptions uint32) (err error) 182 //sys WaitForSingleObject(handle Handle, waitMilliseconds uint32) (event uint32, err error) [failretval==0xffffffff] 183 //sys GetTempPath(buflen uint32, buf *uint16) (n uint32, err error) = GetTempPathW 184 //sys CreatePipe(readhandle *Handle, writehandle *Handle, sa *SecurityAttributes, size uint32) (err error) 185 //sys GetFileType(filehandle Handle) (n uint32, err error) 186 //sys CryptAcquireContext(provhandle *Handle, container *uint16, provider *uint16, provtype uint32, flags uint32) (err error) = advapi32.CryptAcquireContextW 187 //sys CryptReleaseContext(provhandle Handle, flags uint32) (err error) = advapi32.CryptReleaseContext 188 //sys CryptGenRandom(provhandle Handle, buflen uint32, buf *byte) (err error) = advapi32.CryptGenRandom 189 //sys GetEnvironmentStrings() (envs *uint16, err error) [failretval==nil] = kernel32.GetEnvironmentStringsW 190 //sys FreeEnvironmentStrings(envs *uint16) (err error) = kernel32.FreeEnvironmentStringsW 191 //sys GetEnvironmentVariable(name *uint16, buffer *uint16, size uint32) (n uint32, err error) = kernel32.GetEnvironmentVariableW 192 //sys SetEnvironmentVariable(name *uint16, value *uint16) (err error) = kernel32.SetEnvironmentVariableW 193 //sys SetFileTime(handle Handle, ctime *Filetime, atime *Filetime, wtime *Filetime) (err error) 194 //sys GetFileAttributes(name *uint16) (attrs uint32, err error) [failretval==INVALID_FILE_ATTRIBUTES] = kernel32.GetFileAttributesW 195 //sys SetFileAttributes(name *uint16, attrs uint32) (err error) = kernel32.SetFileAttributesW 196 //sys GetFileAttributesEx(name *uint16, level uint32, info *byte) (err error) = kernel32.GetFileAttributesExW 197 //sys GetCommandLine() (cmd *uint16) = kernel32.GetCommandLineW 198 //sys CommandLineToArgv(cmd *uint16, argc *int32) (argv *[8192]*[8192]uint16, err error) [failretval==nil] = shell32.CommandLineToArgvW 199 //sys LocalFree(hmem Handle) (handle Handle, err error) [failretval!=0] 200 //sys SetHandleInformation(handle Handle, mask uint32, flags uint32) (err error) 201 //sys FlushFileBuffers(handle Handle) (err error) 202 //sys GetFullPathName(path *uint16, buflen uint32, buf *uint16, fname **uint16) (n uint32, err error) = kernel32.GetFullPathNameW 203 //sys GetLongPathName(path *uint16, buf *uint16, buflen uint32) (n uint32, err error) = kernel32.GetLongPathNameW 204 //sys GetShortPathName(longpath *uint16, shortpath *uint16, buflen uint32) (n uint32, err error) = kernel32.GetShortPathNameW 205 //sys CreateFileMapping(fhandle Handle, sa *SecurityAttributes, prot uint32, maxSizeHigh uint32, maxSizeLow uint32, name *uint16) (handle Handle, err error) = kernel32.CreateFileMappingW 206 //sys MapViewOfFile(handle Handle, access uint32, offsetHigh uint32, offsetLow uint32, length uintptr) (addr uintptr, err error) 207 //sys UnmapViewOfFile(addr uintptr) (err error) 208 //sys FlushViewOfFile(addr uintptr, length uintptr) (err error) 209 //sys VirtualLock(addr uintptr, length uintptr) (err error) 210 //sys VirtualUnlock(addr uintptr, length uintptr) (err error) 211 //sys TransmitFile(s Handle, handle Handle, bytesToWrite uint32, bytsPerSend uint32, overlapped *Overlapped, transmitFileBuf *TransmitFileBuffers, flags uint32) (err error) = mswsock.TransmitFile 212 //sys ReadDirectoryChanges(handle Handle, buf *byte, buflen uint32, watchSubTree bool, mask uint32, retlen *uint32, overlapped *Overlapped, completionRoutine uintptr) (err error) = kernel32.ReadDirectoryChangesW 213 //sys CertOpenSystemStore(hprov Handle, name *uint16) (store Handle, err error) = crypt32.CertOpenSystemStoreW 214 //sys CertOpenStore(storeProvider uintptr, msgAndCertEncodingType uint32, cryptProv uintptr, flags uint32, para uintptr) (handle Handle, err error) [failretval==InvalidHandle] = crypt32.CertOpenStore 215 //sys CertEnumCertificatesInStore(store Handle, prevContext *CertContext) (context *CertContext, err error) [failretval==nil] = crypt32.CertEnumCertificatesInStore 216 //sys CertAddCertificateContextToStore(store Handle, certContext *CertContext, addDisposition uint32, storeContext **CertContext) (err error) = crypt32.CertAddCertificateContextToStore 217 //sys CertCloseStore(store Handle, flags uint32) (err error) = crypt32.CertCloseStore 218 //sys CertGetCertificateChain(engine Handle, leaf *CertContext, time *Filetime, additionalStore Handle, para *CertChainPara, flags uint32, reserved uintptr, chainCtx **CertChainContext) (err error) = crypt32.CertGetCertificateChain 219 //sys CertFreeCertificateChain(ctx *CertChainContext) = crypt32.CertFreeCertificateChain 220 //sys CertCreateCertificateContext(certEncodingType uint32, certEncoded *byte, encodedLen uint32) (context *CertContext, err error) [failretval==nil] = crypt32.CertCreateCertificateContext 221 //sys CertFreeCertificateContext(ctx *CertContext) (err error) = crypt32.CertFreeCertificateContext 222 //sys CertVerifyCertificateChainPolicy(policyOID uintptr, chain *CertChainContext, para *CertChainPolicyPara, status *CertChainPolicyStatus) (err error) = crypt32.CertVerifyCertificateChainPolicy 223 //sys RegOpenKeyEx(key Handle, subkey *uint16, options uint32, desiredAccess uint32, result *Handle) (regerrno error) = advapi32.RegOpenKeyExW 224 //sys RegCloseKey(key Handle) (regerrno error) = advapi32.RegCloseKey 225 //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 226 //sys RegEnumKeyEx(key Handle, index uint32, name *uint16, nameLen *uint32, reserved *uint32, class *uint16, classLen *uint32, lastWriteTime *Filetime) (regerrno error) = advapi32.RegEnumKeyExW 227 //sys RegQueryValueEx(key Handle, name *uint16, reserved *uint32, valtype *uint32, buf *byte, buflen *uint32) (regerrno error) = advapi32.RegQueryValueExW 228 //sys getCurrentProcessId() (pid uint32) = kernel32.GetCurrentProcessId 229 //sys GetConsoleMode(console Handle, mode *uint32) (err error) = kernel32.GetConsoleMode 230 //sys WriteConsole(console Handle, buf *uint16, towrite uint32, written *uint32, reserved *byte) (err error) = kernel32.WriteConsoleW 231 //sys ReadConsole(console Handle, buf *uint16, toread uint32, read *uint32, inputControl *byte) (err error) = kernel32.ReadConsoleW 232 //sys CreateToolhelp32Snapshot(flags uint32, processId uint32) (handle Handle, err error) [failretval==InvalidHandle] = kernel32.CreateToolhelp32Snapshot 233 //sys Process32First(snapshot Handle, procEntry *ProcessEntry32) (err error) = kernel32.Process32FirstW 234 //sys Process32Next(snapshot Handle, procEntry *ProcessEntry32) (err error) = kernel32.Process32NextW 235 //sys DeviceIoControl(handle Handle, ioControlCode uint32, inBuffer *byte, inBufferSize uint32, outBuffer *byte, outBufferSize uint32, bytesReturned *uint32, overlapped *Overlapped) (err error) 236 // This function returns 1 byte BOOLEAN rather than the 4 byte BOOL. 237 //sys CreateSymbolicLink(symlinkfilename *uint16, targetfilename *uint16, flags uint32) (err error) [failretval&0xff==0] = CreateSymbolicLinkW 238 //sys CreateHardLink(filename *uint16, existingfilename *uint16, reserved uintptr) (err error) [failretval&0xff==0] = CreateHardLinkW 239 240 // syscall interface implementation for other packages 241 242 func Exit(code int) { ExitProcess(uint32(code)) } 243 244 func makeInheritSa() *SecurityAttributes { 245 var sa SecurityAttributes 246 sa.Length = uint32(unsafe.Sizeof(sa)) 247 sa.InheritHandle = 1 248 return &sa 249 } 250 251 func Open(path string, mode int, perm uint32) (fd Handle, err error) { 252 if len(path) == 0 { 253 return InvalidHandle, ERROR_FILE_NOT_FOUND 254 } 255 pathp, err := UTF16PtrFromString(path) 256 if err != nil { 257 return InvalidHandle, err 258 } 259 var access uint32 260 switch mode & (O_RDONLY | O_WRONLY | O_RDWR) { 261 case O_RDONLY: 262 access = GENERIC_READ 263 case O_WRONLY: 264 access = GENERIC_WRITE 265 case O_RDWR: 266 access = GENERIC_READ | GENERIC_WRITE 267 } 268 if mode&O_CREAT != 0 { 269 access |= GENERIC_WRITE 270 } 271 if mode&O_APPEND != 0 { 272 access &^= GENERIC_WRITE 273 access |= FILE_APPEND_DATA 274 } 275 sharemode := uint32(FILE_SHARE_READ | FILE_SHARE_WRITE) 276 var sa *SecurityAttributes 277 if mode&O_CLOEXEC == 0 { 278 sa = makeInheritSa() 279 } 280 var createmode uint32 281 switch { 282 case mode&(O_CREAT|O_EXCL) == (O_CREAT | O_EXCL): 283 createmode = CREATE_NEW 284 case mode&(O_CREAT|O_TRUNC) == (O_CREAT | O_TRUNC): 285 createmode = CREATE_ALWAYS 286 case mode&O_CREAT == O_CREAT: 287 createmode = OPEN_ALWAYS 288 case mode&O_TRUNC == O_TRUNC: 289 createmode = TRUNCATE_EXISTING 290 default: 291 createmode = OPEN_EXISTING 292 } 293 h, e := CreateFile(pathp, access, sharemode, sa, createmode, FILE_ATTRIBUTE_NORMAL, 0) 294 return h, e 295 } 296 297 func Read(fd Handle, p []byte) (n int, err error) { 298 var done uint32 299 e := ReadFile(fd, p, &done, nil) 300 if e != nil { 301 if e == ERROR_BROKEN_PIPE { 302 // NOTE(brainman): work around ERROR_BROKEN_PIPE is returned on reading EOF from stdin 303 return 0, nil 304 } 305 return 0, e 306 } 307 if raceenabled { 308 if done > 0 { 309 raceWriteRange(unsafe.Pointer(&p[0]), int(done)) 310 } 311 raceAcquire(unsafe.Pointer(&ioSync)) 312 } 313 return int(done), nil 314 } 315 316 func Write(fd Handle, p []byte) (n int, err error) { 317 if raceenabled { 318 raceReleaseMerge(unsafe.Pointer(&ioSync)) 319 } 320 var done uint32 321 e := WriteFile(fd, p, &done, nil) 322 if e != nil { 323 return 0, e 324 } 325 if raceenabled && done > 0 { 326 raceReadRange(unsafe.Pointer(&p[0]), int(done)) 327 } 328 return int(done), nil 329 } 330 331 var ioSync int64 332 333 func Seek(fd Handle, offset int64, whence int) (newoffset int64, err error) { 334 var w uint32 335 switch whence { 336 case 0: 337 w = FILE_BEGIN 338 case 1: 339 w = FILE_CURRENT 340 case 2: 341 w = FILE_END 342 } 343 hi := int32(offset >> 32) 344 lo := int32(offset) 345 // use GetFileType to check pipe, pipe can't do seek 346 ft, _ := GetFileType(fd) 347 if ft == FILE_TYPE_PIPE { 348 return 0, EPIPE 349 } 350 rlo, e := SetFilePointer(fd, lo, &hi, w) 351 if e != nil { 352 return 0, e 353 } 354 return int64(hi)<<32 + int64(rlo), nil 355 } 356 357 func Close(fd Handle) (err error) { 358 return CloseHandle(fd) 359 } 360 361 var ( 362 Stdin = getStdHandle(STD_INPUT_HANDLE) 363 Stdout = getStdHandle(STD_OUTPUT_HANDLE) 364 Stderr = getStdHandle(STD_ERROR_HANDLE) 365 ) 366 367 func getStdHandle(h int) (fd Handle) { 368 r, _ := GetStdHandle(h) 369 CloseOnExec(r) 370 return r 371 } 372 373 const ImplementsGetwd = true 374 375 func Getwd() (wd string, err error) { 376 b := make([]uint16, 300) 377 n, e := GetCurrentDirectory(uint32(len(b)), &b[0]) 378 if e != nil { 379 return "", e 380 } 381 return string(utf16.Decode(b[0:n])), nil 382 } 383 384 func Chdir(path string) (err error) { 385 pathp, err := UTF16PtrFromString(path) 386 if err != nil { 387 return err 388 } 389 return SetCurrentDirectory(pathp) 390 } 391 392 func Mkdir(path string, mode uint32) (err error) { 393 pathp, err := UTF16PtrFromString(path) 394 if err != nil { 395 return err 396 } 397 return CreateDirectory(pathp, nil) 398 } 399 400 func Rmdir(path string) (err error) { 401 pathp, err := UTF16PtrFromString(path) 402 if err != nil { 403 return err 404 } 405 return RemoveDirectory(pathp) 406 } 407 408 func Unlink(path string) (err error) { 409 pathp, err := UTF16PtrFromString(path) 410 if err != nil { 411 return err 412 } 413 return DeleteFile(pathp) 414 } 415 416 func Rename(oldpath, newpath string) (err error) { 417 from, err := UTF16PtrFromString(oldpath) 418 if err != nil { 419 return err 420 } 421 to, err := UTF16PtrFromString(newpath) 422 if err != nil { 423 return err 424 } 425 return MoveFile(from, to) 426 } 427 428 func ComputerName() (name string, err error) { 429 var n uint32 = MAX_COMPUTERNAME_LENGTH + 1 430 b := make([]uint16, n) 431 e := GetComputerName(&b[0], &n) 432 if e != nil { 433 return "", e 434 } 435 return string(utf16.Decode(b[0:n])), nil 436 } 437 438 func Ftruncate(fd Handle, length int64) (err error) { 439 curoffset, e := Seek(fd, 0, 1) 440 if e != nil { 441 return e 442 } 443 defer Seek(fd, curoffset, 0) 444 _, e = Seek(fd, length, 0) 445 if e != nil { 446 return e 447 } 448 e = SetEndOfFile(fd) 449 if e != nil { 450 return e 451 } 452 return nil 453 } 454 455 func Gettimeofday(tv *Timeval) (err error) { 456 var ft Filetime 457 GetSystemTimeAsFileTime(&ft) 458 *tv = NsecToTimeval(ft.Nanoseconds()) 459 return nil 460 } 461 462 func Pipe(p []Handle) (err error) { 463 if len(p) != 2 { 464 return EINVAL 465 } 466 var r, w Handle 467 e := CreatePipe(&r, &w, makeInheritSa(), 0) 468 if e != nil { 469 return e 470 } 471 p[0] = r 472 p[1] = w 473 return nil 474 } 475 476 func Utimes(path string, tv []Timeval) (err error) { 477 if len(tv) != 2 { 478 return EINVAL 479 } 480 pathp, e := UTF16PtrFromString(path) 481 if e != nil { 482 return e 483 } 484 h, e := CreateFile(pathp, 485 FILE_WRITE_ATTRIBUTES, FILE_SHARE_WRITE, nil, 486 OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0) 487 if e != nil { 488 return e 489 } 490 defer Close(h) 491 a := NsecToFiletime(tv[0].Nanoseconds()) 492 w := NsecToFiletime(tv[1].Nanoseconds()) 493 return SetFileTime(h, nil, &a, &w) 494 } 495 496 func UtimesNano(path string, ts []Timespec) (err error) { 497 if len(ts) != 2 { 498 return EINVAL 499 } 500 pathp, e := UTF16PtrFromString(path) 501 if e != nil { 502 return e 503 } 504 h, e := CreateFile(pathp, 505 FILE_WRITE_ATTRIBUTES, FILE_SHARE_WRITE, nil, 506 OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0) 507 if e != nil { 508 return e 509 } 510 defer Close(h) 511 a := NsecToFiletime(TimespecToNsec(ts[0])) 512 w := NsecToFiletime(TimespecToNsec(ts[1])) 513 return SetFileTime(h, nil, &a, &w) 514 } 515 516 func Fsync(fd Handle) (err error) { 517 return FlushFileBuffers(fd) 518 } 519 520 func Chmod(path string, mode uint32) (err error) { 521 if mode == 0 { 522 return EINVAL 523 } 524 p, e := UTF16PtrFromString(path) 525 if e != nil { 526 return e 527 } 528 attrs, e := GetFileAttributes(p) 529 if e != nil { 530 return e 531 } 532 if mode&S_IWRITE != 0 { 533 attrs &^= FILE_ATTRIBUTE_READONLY 534 } else { 535 attrs |= FILE_ATTRIBUTE_READONLY 536 } 537 return SetFileAttributes(p, attrs) 538 } 539 540 func LoadCancelIoEx() error { 541 return procCancelIoEx.Find() 542 } 543 544 func LoadSetFileCompletionNotificationModes() error { 545 return procSetFileCompletionNotificationModes.Find() 546 } 547 548 // net api calls 549 550 const socket_error = uintptr(^uint32(0)) 551 552 //sys WSAStartup(verreq uint32, data *WSAData) (sockerr error) = ws2_32.WSAStartup 553 //sys WSACleanup() (err error) [failretval==socket_error] = ws2_32.WSACleanup 554 //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 555 //sys socket(af int32, typ int32, protocol int32) (handle Handle, err error) [failretval==InvalidHandle] = ws2_32.socket 556 //sys Setsockopt(s Handle, level int32, optname int32, optval *byte, optlen int32) (err error) [failretval==socket_error] = ws2_32.setsockopt 557 //sys Getsockopt(s Handle, level int32, optname int32, optval *byte, optlen *int32) (err error) [failretval==socket_error] = ws2_32.getsockopt 558 //sys bind(s Handle, name unsafe.Pointer, namelen int32) (err error) [failretval==socket_error] = ws2_32.bind 559 //sys connect(s Handle, name unsafe.Pointer, namelen int32) (err error) [failretval==socket_error] = ws2_32.connect 560 //sys getsockname(s Handle, rsa *RawSockaddrAny, addrlen *int32) (err error) [failretval==socket_error] = ws2_32.getsockname 561 //sys getpeername(s Handle, rsa *RawSockaddrAny, addrlen *int32) (err error) [failretval==socket_error] = ws2_32.getpeername 562 //sys listen(s Handle, backlog int32) (err error) [failretval==socket_error] = ws2_32.listen 563 //sys shutdown(s Handle, how int32) (err error) [failretval==socket_error] = ws2_32.shutdown 564 //sys Closesocket(s Handle) (err error) [failretval==socket_error] = ws2_32.closesocket 565 //sys AcceptEx(ls Handle, as Handle, buf *byte, rxdatalen uint32, laddrlen uint32, raddrlen uint32, recvd *uint32, overlapped *Overlapped) (err error) = mswsock.AcceptEx 566 //sys GetAcceptExSockaddrs(buf *byte, rxdatalen uint32, laddrlen uint32, raddrlen uint32, lrsa **RawSockaddrAny, lrsalen *int32, rrsa **RawSockaddrAny, rrsalen *int32) = mswsock.GetAcceptExSockaddrs 567 //sys WSARecv(s Handle, bufs *WSABuf, bufcnt uint32, recvd *uint32, flags *uint32, overlapped *Overlapped, croutine *byte) (err error) [failretval==socket_error] = ws2_32.WSARecv 568 //sys WSASend(s Handle, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, overlapped *Overlapped, croutine *byte) (err error) [failretval==socket_error] = ws2_32.WSASend 569 //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 570 //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 571 //sys GetHostByName(name string) (h *Hostent, err error) [failretval==nil] = ws2_32.gethostbyname 572 //sys GetServByName(name string, proto string) (s *Servent, err error) [failretval==nil] = ws2_32.getservbyname 573 //sys Ntohs(netshort uint16) (u uint16) = ws2_32.ntohs 574 //sys GetProtoByName(name string) (p *Protoent, err error) [failretval==nil] = ws2_32.getprotobyname 575 //sys DnsQuery(name string, qtype uint16, options uint32, extra *byte, qrs **DNSRecord, pr *byte) (status error) = dnsapi.DnsQuery_W 576 //sys DnsRecordListFree(rl *DNSRecord, freetype uint32) = dnsapi.DnsRecordListFree 577 //sys DnsNameCompare(name1 *uint16, name2 *uint16) (same bool) = dnsapi.DnsNameCompare_W 578 //sys GetAddrInfoW(nodename *uint16, servicename *uint16, hints *AddrinfoW, result **AddrinfoW) (sockerr error) = ws2_32.GetAddrInfoW 579 //sys FreeAddrInfoW(addrinfo *AddrinfoW) = ws2_32.FreeAddrInfoW 580 //sys GetIfEntry(pIfRow *MibIfRow) (errcode error) = iphlpapi.GetIfEntry 581 //sys GetAdaptersInfo(ai *IpAdapterInfo, ol *uint32) (errcode error) = iphlpapi.GetAdaptersInfo 582 //sys SetFileCompletionNotificationModes(handle Handle, flags uint8) (err error) = kernel32.SetFileCompletionNotificationModes 583 //sys WSAEnumProtocols(protocols *int32, protocolBuffer *WSAProtocolInfo, bufferLength *uint32) (n int32, err error) [failretval==-1] = ws2_32.WSAEnumProtocolsW 584 585 // For testing: clients can set this flag to force 586 // creation of IPv6 sockets to return EAFNOSUPPORT. 587 var SocketDisableIPv6 bool 588 589 type RawSockaddrInet4 struct { 590 Family uint16 591 Port uint16 592 Addr [4]byte /* in_addr */ 593 Zero [8]uint8 594 } 595 596 type RawSockaddrInet6 struct { 597 Family uint16 598 Port uint16 599 Flowinfo uint32 600 Addr [16]byte /* in6_addr */ 601 Scope_id uint32 602 } 603 604 type RawSockaddr struct { 605 Family uint16 606 Data [14]int8 607 } 608 609 type RawSockaddrAny struct { 610 Addr RawSockaddr 611 Pad [96]int8 612 } 613 614 type Sockaddr interface { 615 sockaddr() (ptr unsafe.Pointer, len int32, err error) // lowercase; only we can define Sockaddrs 616 } 617 618 type SockaddrInet4 struct { 619 Port int 620 Addr [4]byte 621 raw RawSockaddrInet4 622 } 623 624 func (sa *SockaddrInet4) sockaddr() (unsafe.Pointer, int32, error) { 625 if sa.Port < 0 || sa.Port > 0xFFFF { 626 return nil, 0, EINVAL 627 } 628 sa.raw.Family = AF_INET 629 p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port)) 630 p[0] = byte(sa.Port >> 8) 631 p[1] = byte(sa.Port) 632 for i := 0; i < len(sa.Addr); i++ { 633 sa.raw.Addr[i] = sa.Addr[i] 634 } 635 return unsafe.Pointer(&sa.raw), int32(unsafe.Sizeof(sa.raw)), nil 636 } 637 638 type SockaddrInet6 struct { 639 Port int 640 ZoneId uint32 641 Addr [16]byte 642 raw RawSockaddrInet6 643 } 644 645 func (sa *SockaddrInet6) sockaddr() (unsafe.Pointer, int32, error) { 646 if sa.Port < 0 || sa.Port > 0xFFFF { 647 return nil, 0, EINVAL 648 } 649 sa.raw.Family = AF_INET6 650 p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port)) 651 p[0] = byte(sa.Port >> 8) 652 p[1] = byte(sa.Port) 653 sa.raw.Scope_id = sa.ZoneId 654 for i := 0; i < len(sa.Addr); i++ { 655 sa.raw.Addr[i] = sa.Addr[i] 656 } 657 return unsafe.Pointer(&sa.raw), int32(unsafe.Sizeof(sa.raw)), nil 658 } 659 660 type SockaddrUnix struct { 661 Name string 662 } 663 664 func (sa *SockaddrUnix) sockaddr() (unsafe.Pointer, int32, error) { 665 // TODO(brainman): implement SockaddrUnix.sockaddr() 666 return nil, 0, EWINDOWS 667 } 668 669 func (rsa *RawSockaddrAny) Sockaddr() (Sockaddr, error) { 670 switch rsa.Addr.Family { 671 case AF_UNIX: 672 return nil, EWINDOWS 673 674 case AF_INET: 675 pp := (*RawSockaddrInet4)(unsafe.Pointer(rsa)) 676 sa := new(SockaddrInet4) 677 p := (*[2]byte)(unsafe.Pointer(&pp.Port)) 678 sa.Port = int(p[0])<<8 + int(p[1]) 679 for i := 0; i < len(sa.Addr); i++ { 680 sa.Addr[i] = pp.Addr[i] 681 } 682 return sa, nil 683 684 case AF_INET6: 685 pp := (*RawSockaddrInet6)(unsafe.Pointer(rsa)) 686 sa := new(SockaddrInet6) 687 p := (*[2]byte)(unsafe.Pointer(&pp.Port)) 688 sa.Port = int(p[0])<<8 + int(p[1]) 689 sa.ZoneId = pp.Scope_id 690 for i := 0; i < len(sa.Addr); i++ { 691 sa.Addr[i] = pp.Addr[i] 692 } 693 return sa, nil 694 } 695 return nil, EAFNOSUPPORT 696 } 697 698 func Socket(domain, typ, proto int) (fd Handle, err error) { 699 if domain == AF_INET6 && SocketDisableIPv6 { 700 return InvalidHandle, EAFNOSUPPORT 701 } 702 return socket(int32(domain), int32(typ), int32(proto)) 703 } 704 705 func SetsockoptInt(fd Handle, level, opt int, value int) (err error) { 706 v := int32(value) 707 return Setsockopt(fd, int32(level), int32(opt), (*byte)(unsafe.Pointer(&v)), int32(unsafe.Sizeof(v))) 708 } 709 710 func Bind(fd Handle, sa Sockaddr) (err error) { 711 ptr, n, err := sa.sockaddr() 712 if err != nil { 713 return err 714 } 715 return bind(fd, ptr, n) 716 } 717 718 func Connect(fd Handle, sa Sockaddr) (err error) { 719 ptr, n, err := sa.sockaddr() 720 if err != nil { 721 return err 722 } 723 return connect(fd, ptr, n) 724 } 725 726 func Getsockname(fd Handle) (sa Sockaddr, err error) { 727 var rsa RawSockaddrAny 728 l := int32(unsafe.Sizeof(rsa)) 729 if err = getsockname(fd, &rsa, &l); err != nil { 730 return 731 } 732 return rsa.Sockaddr() 733 } 734 735 func Getpeername(fd Handle) (sa Sockaddr, err error) { 736 var rsa RawSockaddrAny 737 l := int32(unsafe.Sizeof(rsa)) 738 if err = getpeername(fd, &rsa, &l); err != nil { 739 return 740 } 741 return rsa.Sockaddr() 742 } 743 744 func Listen(s Handle, n int) (err error) { 745 return listen(s, int32(n)) 746 } 747 748 func Shutdown(fd Handle, how int) (err error) { 749 return shutdown(fd, int32(how)) 750 } 751 752 func WSASendto(s Handle, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, to Sockaddr, overlapped *Overlapped, croutine *byte) (err error) { 753 rsa, l, err := to.sockaddr() 754 if err != nil { 755 return err 756 } 757 return WSASendTo(s, bufs, bufcnt, sent, flags, (*RawSockaddrAny)(unsafe.Pointer(rsa)), l, overlapped, croutine) 758 } 759 760 func LoadGetAddrInfo() error { 761 return procGetAddrInfoW.Find() 762 } 763 764 var connectExFunc struct { 765 once sync.Once 766 addr uintptr 767 err error 768 } 769 770 func LoadConnectEx() error { 771 connectExFunc.once.Do(func() { 772 var s Handle 773 s, connectExFunc.err = Socket(AF_INET, SOCK_STREAM, IPPROTO_TCP) 774 if connectExFunc.err != nil { 775 return 776 } 777 defer CloseHandle(s) 778 var n uint32 779 connectExFunc.err = WSAIoctl(s, 780 SIO_GET_EXTENSION_FUNCTION_POINTER, 781 (*byte)(unsafe.Pointer(&WSAID_CONNECTEX)), 782 uint32(unsafe.Sizeof(WSAID_CONNECTEX)), 783 (*byte)(unsafe.Pointer(&connectExFunc.addr)), 784 uint32(unsafe.Sizeof(connectExFunc.addr)), 785 &n, nil, 0) 786 }) 787 return connectExFunc.err 788 } 789 790 func connectEx(s Handle, name unsafe.Pointer, namelen int32, sendBuf *byte, sendDataLen uint32, bytesSent *uint32, overlapped *Overlapped) (err error) { 791 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) 792 if r1 == 0 { 793 if e1 != 0 { 794 err = error(e1) 795 } else { 796 err = EINVAL 797 } 798 } 799 return 800 } 801 802 func ConnectEx(fd Handle, sa Sockaddr, sendBuf *byte, sendDataLen uint32, bytesSent *uint32, overlapped *Overlapped) error { 803 err := LoadConnectEx() 804 if err != nil { 805 return errorspkg.New("failed to find ConnectEx: " + err.Error()) 806 } 807 ptr, n, err := sa.sockaddr() 808 if err != nil { 809 return err 810 } 811 return connectEx(fd, ptr, n, sendBuf, sendDataLen, bytesSent, overlapped) 812 } 813 814 // Invented structures to support what package os expects. 815 type Rusage struct { 816 CreationTime Filetime 817 ExitTime Filetime 818 KernelTime Filetime 819 UserTime Filetime 820 } 821 822 type WaitStatus struct { 823 ExitCode uint32 824 } 825 826 func (w WaitStatus) Exited() bool { return true } 827 828 func (w WaitStatus) ExitStatus() int { return int(w.ExitCode) } 829 830 func (w WaitStatus) Signal() Signal { return -1 } 831 832 func (w WaitStatus) CoreDump() bool { return false } 833 834 func (w WaitStatus) Stopped() bool { return false } 835 836 func (w WaitStatus) Continued() bool { return false } 837 838 func (w WaitStatus) StopSignal() Signal { return -1 } 839 840 func (w WaitStatus) Signaled() bool { return false } 841 842 func (w WaitStatus) TrapCause() int { return -1 } 843 844 // Timespec is an invented structure on Windows, but here for 845 // consistency with the syscall package for other operating systems. 846 type Timespec struct { 847 Sec int64 848 Nsec int64 849 } 850 851 func TimespecToNsec(ts Timespec) int64 { return int64(ts.Sec)*1e9 + int64(ts.Nsec) } 852 853 func NsecToTimespec(nsec int64) (ts Timespec) { 854 ts.Sec = nsec / 1e9 855 ts.Nsec = nsec % 1e9 856 return 857 } 858 859 // TODO(brainman): fix all needed for net 860 861 func Accept(fd Handle) (nfd Handle, sa Sockaddr, err error) { return 0, nil, EWINDOWS } 862 func Recvfrom(fd Handle, p []byte, flags int) (n int, from Sockaddr, err error) { 863 return 0, nil, EWINDOWS 864 } 865 func Sendto(fd Handle, p []byte, flags int, to Sockaddr) (err error) { return EWINDOWS } 866 func SetsockoptTimeval(fd Handle, level, opt int, tv *Timeval) (err error) { return EWINDOWS } 867 868 // The Linger struct is wrong but we only noticed after Go 1. 869 // sysLinger is the real system call structure. 870 871 // BUG(brainman): The definition of Linger is not appropriate for direct use 872 // with Setsockopt and Getsockopt. 873 // Use SetsockoptLinger instead. 874 875 type Linger struct { 876 Onoff int32 877 Linger int32 878 } 879 880 type sysLinger struct { 881 Onoff uint16 882 Linger uint16 883 } 884 885 type IPMreq struct { 886 Multiaddr [4]byte /* in_addr */ 887 Interface [4]byte /* in_addr */ 888 } 889 890 type IPv6Mreq struct { 891 Multiaddr [16]byte /* in6_addr */ 892 Interface uint32 893 } 894 895 func GetsockoptInt(fd Handle, level, opt int) (int, error) { return -1, EWINDOWS } 896 897 func SetsockoptLinger(fd Handle, level, opt int, l *Linger) (err error) { 898 sys := sysLinger{Onoff: uint16(l.Onoff), Linger: uint16(l.Linger)} 899 return Setsockopt(fd, int32(level), int32(opt), (*byte)(unsafe.Pointer(&sys)), int32(unsafe.Sizeof(sys))) 900 } 901 902 func SetsockoptInet4Addr(fd Handle, level, opt int, value [4]byte) (err error) { 903 return Setsockopt(fd, int32(level), int32(opt), (*byte)(unsafe.Pointer(&value[0])), 4) 904 } 905 func SetsockoptIPMreq(fd Handle, level, opt int, mreq *IPMreq) (err error) { 906 return Setsockopt(fd, int32(level), int32(opt), (*byte)(unsafe.Pointer(mreq)), int32(unsafe.Sizeof(*mreq))) 907 } 908 func SetsockoptIPv6Mreq(fd Handle, level, opt int, mreq *IPv6Mreq) (err error) { return EWINDOWS } 909 910 func Getpid() (pid int) { return int(getCurrentProcessId()) } 911 912 func FindFirstFile(name *uint16, data *Win32finddata) (handle Handle, err error) { 913 // NOTE(rsc): The Win32finddata struct is wrong for the system call: 914 // the two paths are each one uint16 short. Use the correct struct, 915 // a win32finddata1, and then copy the results out. 916 // There is no loss of expressivity here, because the final 917 // uint16, if it is used, is supposed to be a NUL, and Go doesn't need that. 918 // For Go 1.1, we might avoid the allocation of win32finddata1 here 919 // by adding a final Bug [2]uint16 field to the struct and then 920 // adjusting the fields in the result directly. 921 var data1 win32finddata1 922 handle, err = findFirstFile1(name, &data1) 923 if err == nil { 924 copyFindData(data, &data1) 925 } 926 return 927 } 928 929 func FindNextFile(handle Handle, data *Win32finddata) (err error) { 930 var data1 win32finddata1 931 err = findNextFile1(handle, &data1) 932 if err == nil { 933 copyFindData(data, &data1) 934 } 935 return 936 } 937 938 func getProcessEntry(pid int) (*ProcessEntry32, error) { 939 snapshot, err := CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0) 940 if err != nil { 941 return nil, err 942 } 943 defer CloseHandle(snapshot) 944 var procEntry ProcessEntry32 945 procEntry.Size = uint32(unsafe.Sizeof(procEntry)) 946 if err = Process32First(snapshot, &procEntry); err != nil { 947 return nil, err 948 } 949 for { 950 if procEntry.ProcessID == uint32(pid) { 951 return &procEntry, nil 952 } 953 err = Process32Next(snapshot, &procEntry) 954 if err != nil { 955 return nil, err 956 } 957 } 958 } 959 960 func Getppid() (ppid int) { 961 pe, err := getProcessEntry(Getpid()) 962 if err != nil { 963 return -1 964 } 965 return int(pe.ParentProcessID) 966 } 967 968 // TODO(brainman): fix all needed for os 969 func Fchdir(fd Handle) (err error) { return EWINDOWS } 970 func Link(oldpath, newpath string) (err error) { return EWINDOWS } 971 func Symlink(path, link string) (err error) { return EWINDOWS } 972 973 func Fchmod(fd Handle, mode uint32) (err error) { return EWINDOWS } 974 func Chown(path string, uid int, gid int) (err error) { return EWINDOWS } 975 func Lchown(path string, uid int, gid int) (err error) { return EWINDOWS } 976 func Fchown(fd Handle, uid int, gid int) (err error) { return EWINDOWS } 977 978 func Getuid() (uid int) { return -1 } 979 func Geteuid() (euid int) { return -1 } 980 func Getgid() (gid int) { return -1 } 981 func Getegid() (egid int) { return -1 } 982 func Getgroups() (gids []int, err error) { return nil, EWINDOWS } 983 984 type Signal int 985 986 func (s Signal) Signal() {} 987 988 func (s Signal) String() string { 989 if 0 <= s && int(s) < len(signals) { 990 str := signals[s] 991 if str != "" { 992 return str 993 } 994 } 995 return "signal " + itoa(int(s)) 996 } 997 998 func LoadCreateSymbolicLink() error { 999 return procCreateSymbolicLinkW.Find() 1000 } 1001 1002 // Readlink returns the destination of the named symbolic link. 1003 func Readlink(path string, buf []byte) (n int, err error) { 1004 fd, err := CreateFile(StringToUTF16Ptr(path), GENERIC_READ, 0, nil, OPEN_EXISTING, 1005 FILE_FLAG_OPEN_REPARSE_POINT|FILE_FLAG_BACKUP_SEMANTICS, 0) 1006 if err != nil { 1007 return -1, err 1008 } 1009 defer CloseHandle(fd) 1010 1011 rdbbuf := make([]byte, MAXIMUM_REPARSE_DATA_BUFFER_SIZE) 1012 var bytesReturned uint32 1013 err = DeviceIoControl(fd, FSCTL_GET_REPARSE_POINT, nil, 0, &rdbbuf[0], uint32(len(rdbbuf)), &bytesReturned, nil) 1014 if err != nil { 1015 return -1, err 1016 } 1017 1018 rdb := (*reparseDataBuffer)(unsafe.Pointer(&rdbbuf[0])) 1019 var s string 1020 switch rdb.ReparseTag { 1021 case IO_REPARSE_TAG_SYMLINK: 1022 data := (*symbolicLinkReparseBuffer)(unsafe.Pointer(&rdb.reparseBuffer)) 1023 p := (*[0xffff]uint16)(unsafe.Pointer(&data.PathBuffer[0])) 1024 s = UTF16ToString(p[data.PrintNameOffset/2 : (data.PrintNameLength-data.PrintNameOffset)/2]) 1025 case _IO_REPARSE_TAG_MOUNT_POINT: 1026 data := (*mountPointReparseBuffer)(unsafe.Pointer(&rdb.reparseBuffer)) 1027 p := (*[0xffff]uint16)(unsafe.Pointer(&data.PathBuffer[0])) 1028 s = UTF16ToString(p[data.PrintNameOffset/2 : (data.PrintNameLength-data.PrintNameOffset)/2]) 1029 default: 1030 // the path is not a symlink or junction but another type of reparse 1031 // point 1032 return -1, ENOENT 1033 } 1034 n = copy(buf, []byte(s)) 1035 1036 return n, nil 1037 }