github.com/mattn/go@v0.0.0-20171011075504-07f7db3ea99f/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 "internal/race" 12 "sync" 13 "unicode/utf16" 14 "unsafe" 15 ) 16 17 type Handle uintptr 18 19 const InvalidHandle = ^Handle(0) 20 21 // StringToUTF16 returns the UTF-16 encoding of the UTF-8 string s, 22 // with a terminating NUL added. If s contains a NUL byte this 23 // function panics instead of returning an error. 24 // 25 // Deprecated: Use UTF16FromString instead. 26 func StringToUTF16(s string) []uint16 { 27 a, err := UTF16FromString(s) 28 if err != nil { 29 panic("syscall: string with NUL passed to StringToUTF16") 30 } 31 return a 32 } 33 34 // UTF16FromString returns the UTF-16 encoding of the UTF-8 string 35 // s, with a terminating NUL added. If s contains a NUL byte at any 36 // location, it returns (nil, EINVAL). 37 func UTF16FromString(s string) ([]uint16, error) { 38 for i := 0; i < len(s); i++ { 39 if s[i] == 0 { 40 return nil, EINVAL 41 } 42 } 43 return utf16.Encode([]rune(s + "\x00")), nil 44 } 45 46 // UTF16ToString returns the UTF-8 encoding of the UTF-16 sequence s, 47 // with a terminating NUL removed. 48 func UTF16ToString(s []uint16) string { 49 for i, v := range s { 50 if v == 0 { 51 s = s[0:i] 52 break 53 } 54 } 55 return string(utf16.Decode(s)) 56 } 57 58 // StringToUTF16Ptr returns pointer to the UTF-16 encoding of 59 // the UTF-8 string s, with a terminating NUL added. If s 60 // contains a NUL byte this function panics instead of 61 // returning an error. 62 // 63 // Deprecated: Use UTF16PtrFromString instead. 64 func StringToUTF16Ptr(s string) *uint16 { return &StringToUTF16(s)[0] } 65 66 // UTF16PtrFromString returns pointer to the UTF-16 encoding of 67 // the UTF-8 string s, with a terminating NUL added. If s 68 // contains a NUL byte at any location, it returns (nil, EINVAL). 69 func UTF16PtrFromString(s string) (*uint16, error) { 70 a, err := UTF16FromString(s) 71 if err != nil { 72 return nil, err 73 } 74 return &a[0], nil 75 } 76 77 // Errno is the Windows error number. 78 type Errno uintptr 79 80 func langid(pri, sub uint16) uint32 { return uint32(sub)<<10 | uint32(pri) } 81 82 // FormatMessage is deprecated (msgsrc should be uintptr, not uint32, but can 83 // not be changed due to the Go 1 compatibility guarantee). 84 // 85 // Deprecated: Use FormatMessage from golang.org/x/sys/windows instead. 86 func FormatMessage(flags uint32, msgsrc uint32, msgid uint32, langid uint32, buf []uint16, args *byte) (n uint32, err error) { 87 return formatMessage(flags, uintptr(msgsrc), msgid, langid, buf, args) 88 } 89 90 func (e Errno) Error() string { 91 // deal with special go errors 92 idx := int(e - APPLICATION_ERROR) 93 if 0 <= idx && idx < len(errors) { 94 return errors[idx] 95 } 96 // ask windows for the remaining errors 97 var flags uint32 = FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ARGUMENT_ARRAY | FORMAT_MESSAGE_IGNORE_INSERTS 98 b := make([]uint16, 300) 99 n, err := formatMessage(flags, 0, uint32(e), langid(LANG_ENGLISH, SUBLANG_ENGLISH_US), b, nil) 100 if err != nil { 101 n, err = formatMessage(flags, 0, uint32(e), 0, b, nil) 102 if err != nil { 103 return "winapi error #" + itoa(int(e)) 104 } 105 } 106 // trim terminating \r and \n 107 for ; n > 0 && (b[n-1] == '\n' || b[n-1] == '\r'); n-- { 108 } 109 return string(utf16.Decode(b[:n])) 110 } 111 112 func (e Errno) Temporary() bool { 113 return e == EINTR || e == EMFILE || e == WSAECONNABORTED || e == WSAECONNRESET || e.Timeout() 114 } 115 116 func (e Errno) Timeout() bool { 117 return e == EAGAIN || e == EWOULDBLOCK || e == ETIMEDOUT 118 } 119 120 // Implemented in runtime/syscall_windows.go. 121 func compileCallback(fn interface{}, cleanstack bool) uintptr 122 123 // Converts a Go function to a function pointer conforming 124 // to the stdcall calling convention. This is useful when 125 // interoperating with Windows code requiring callbacks. 126 func NewCallback(fn interface{}) uintptr { 127 return compileCallback(fn, true) 128 } 129 130 // Converts a Go function to a function pointer conforming 131 // to the cdecl calling convention. This is useful when 132 // interoperating with Windows code requiring callbacks. 133 func NewCallbackCDecl(fn interface{}) uintptr { 134 return compileCallback(fn, false) 135 } 136 137 // windows api calls 138 139 //sys GetLastError() (lasterr error) 140 //sys LoadLibrary(libname string) (handle Handle, err error) = LoadLibraryW 141 //sys FreeLibrary(handle Handle) (err error) 142 //sys GetProcAddress(module Handle, procname string) (proc uintptr, err error) 143 //sys GetVersion() (ver uint32, err error) 144 //sys formatMessage(flags uint32, msgsrc uintptr, msgid uint32, langid uint32, buf []uint16, args *byte) (n uint32, err error) = FormatMessageW 145 //sys ExitProcess(exitcode uint32) 146 //sys CreateFile(name *uint16, access uint32, mode uint32, sa *SecurityAttributes, createmode uint32, attrs uint32, templatefile int32) (handle Handle, err error) [failretval==InvalidHandle] = CreateFileW 147 //sys ReadFile(handle Handle, buf []byte, done *uint32, overlapped *Overlapped) (err error) 148 //sys WriteFile(handle Handle, buf []byte, done *uint32, overlapped *Overlapped) (err error) 149 //sys SetFilePointer(handle Handle, lowoffset int32, highoffsetptr *int32, whence uint32) (newlowoffset uint32, err error) [failretval==0xffffffff] 150 //sys CloseHandle(handle Handle) (err error) 151 //sys GetStdHandle(stdhandle int) (handle Handle, err error) [failretval==InvalidHandle] 152 //sys findFirstFile1(name *uint16, data *win32finddata1) (handle Handle, err error) [failretval==InvalidHandle] = FindFirstFileW 153 //sys findNextFile1(handle Handle, data *win32finddata1) (err error) = FindNextFileW 154 //sys FindClose(handle Handle) (err error) 155 //sys GetFileInformationByHandle(handle Handle, data *ByHandleFileInformation) (err error) 156 //sys GetCurrentDirectory(buflen uint32, buf *uint16) (n uint32, err error) = GetCurrentDirectoryW 157 //sys SetCurrentDirectory(path *uint16) (err error) = SetCurrentDirectoryW 158 //sys CreateDirectory(path *uint16, sa *SecurityAttributes) (err error) = CreateDirectoryW 159 //sys RemoveDirectory(path *uint16) (err error) = RemoveDirectoryW 160 //sys DeleteFile(path *uint16) (err error) = DeleteFileW 161 //sys MoveFile(from *uint16, to *uint16) (err error) = MoveFileW 162 //sys GetComputerName(buf *uint16, n *uint32) (err error) = GetComputerNameW 163 //sys SetEndOfFile(handle Handle) (err error) 164 //sys GetSystemTimeAsFileTime(time *Filetime) 165 //sys GetTimeZoneInformation(tzi *Timezoneinformation) (rc uint32, err error) [failretval==0xffffffff] 166 //sys CreateIoCompletionPort(filehandle Handle, cphandle Handle, key uint32, threadcnt uint32) (handle Handle, err error) 167 //sys GetQueuedCompletionStatus(cphandle Handle, qty *uint32, key *uint32, overlapped **Overlapped, timeout uint32) (err error) 168 //sys PostQueuedCompletionStatus(cphandle Handle, qty uint32, key uint32, overlapped *Overlapped) (err error) 169 //sys CancelIo(s Handle) (err error) 170 //sys CancelIoEx(s Handle, o *Overlapped) (err error) 171 //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 172 //sys OpenProcess(da uint32, inheritHandle bool, pid uint32) (handle Handle, err error) 173 //sys TerminateProcess(handle Handle, exitcode uint32) (err error) 174 //sys GetExitCodeProcess(handle Handle, exitcode *uint32) (err error) 175 //sys GetStartupInfo(startupInfo *StartupInfo) (err error) = GetStartupInfoW 176 //sys GetCurrentProcess() (pseudoHandle Handle, err error) 177 //sys GetProcessTimes(handle Handle, creationTime *Filetime, exitTime *Filetime, kernelTime *Filetime, userTime *Filetime) (err error) 178 //sys DuplicateHandle(hSourceProcessHandle Handle, hSourceHandle Handle, hTargetProcessHandle Handle, lpTargetHandle *Handle, dwDesiredAccess uint32, bInheritHandle bool, dwOptions uint32) (err error) 179 //sys WaitForSingleObject(handle Handle, waitMilliseconds uint32) (event uint32, err error) [failretval==0xffffffff] 180 //sys GetTempPath(buflen uint32, buf *uint16) (n uint32, err error) = GetTempPathW 181 //sys CreatePipe(readhandle *Handle, writehandle *Handle, sa *SecurityAttributes, size uint32) (err error) 182 //sys GetFileType(filehandle Handle) (n uint32, err error) 183 //sys CryptAcquireContext(provhandle *Handle, container *uint16, provider *uint16, provtype uint32, flags uint32) (err error) = advapi32.CryptAcquireContextW 184 //sys CryptReleaseContext(provhandle Handle, flags uint32) (err error) = advapi32.CryptReleaseContext 185 //sys CryptGenRandom(provhandle Handle, buflen uint32, buf *byte) (err error) = advapi32.CryptGenRandom 186 //sys GetEnvironmentStrings() (envs *uint16, err error) [failretval==nil] = kernel32.GetEnvironmentStringsW 187 //sys FreeEnvironmentStrings(envs *uint16) (err error) = kernel32.FreeEnvironmentStringsW 188 //sys GetEnvironmentVariable(name *uint16, buffer *uint16, size uint32) (n uint32, err error) = kernel32.GetEnvironmentVariableW 189 //sys SetEnvironmentVariable(name *uint16, value *uint16) (err error) = kernel32.SetEnvironmentVariableW 190 //sys SetFileTime(handle Handle, ctime *Filetime, atime *Filetime, wtime *Filetime) (err error) 191 //sys GetFileAttributes(name *uint16) (attrs uint32, err error) [failretval==INVALID_FILE_ATTRIBUTES] = kernel32.GetFileAttributesW 192 //sys SetFileAttributes(name *uint16, attrs uint32) (err error) = kernel32.SetFileAttributesW 193 //sys GetFileAttributesEx(name *uint16, level uint32, info *byte) (err error) = kernel32.GetFileAttributesExW 194 //sys GetCommandLine() (cmd *uint16) = kernel32.GetCommandLineW 195 //sys CommandLineToArgv(cmd *uint16, argc *int32) (argv *[8192]*[8192]uint16, err error) [failretval==nil] = shell32.CommandLineToArgvW 196 //sys LocalFree(hmem Handle) (handle Handle, err error) [failretval!=0] 197 //sys SetHandleInformation(handle Handle, mask uint32, flags uint32) (err error) 198 //sys FlushFileBuffers(handle Handle) (err error) 199 //sys GetFullPathName(path *uint16, buflen uint32, buf *uint16, fname **uint16) (n uint32, err error) = kernel32.GetFullPathNameW 200 //sys GetLongPathName(path *uint16, buf *uint16, buflen uint32) (n uint32, err error) = kernel32.GetLongPathNameW 201 //sys GetShortPathName(longpath *uint16, shortpath *uint16, buflen uint32) (n uint32, err error) = kernel32.GetShortPathNameW 202 //sys CreateFileMapping(fhandle Handle, sa *SecurityAttributes, prot uint32, maxSizeHigh uint32, maxSizeLow uint32, name *uint16) (handle Handle, err error) = kernel32.CreateFileMappingW 203 //sys MapViewOfFile(handle Handle, access uint32, offsetHigh uint32, offsetLow uint32, length uintptr) (addr uintptr, err error) 204 //sys UnmapViewOfFile(addr uintptr) (err error) 205 //sys FlushViewOfFile(addr uintptr, length uintptr) (err error) 206 //sys VirtualLock(addr uintptr, length uintptr) (err error) 207 //sys VirtualUnlock(addr uintptr, length uintptr) (err error) 208 //sys TransmitFile(s Handle, handle Handle, bytesToWrite uint32, bytsPerSend uint32, overlapped *Overlapped, transmitFileBuf *TransmitFileBuffers, flags uint32) (err error) = mswsock.TransmitFile 209 //sys ReadDirectoryChanges(handle Handle, buf *byte, buflen uint32, watchSubTree bool, mask uint32, retlen *uint32, overlapped *Overlapped, completionRoutine uintptr) (err error) = kernel32.ReadDirectoryChangesW 210 //sys CertOpenSystemStore(hprov Handle, name *uint16) (store Handle, err error) = crypt32.CertOpenSystemStoreW 211 //sys CertOpenStore(storeProvider uintptr, msgAndCertEncodingType uint32, cryptProv uintptr, flags uint32, para uintptr) (handle Handle, err error) [failretval==InvalidHandle] = crypt32.CertOpenStore 212 //sys CertEnumCertificatesInStore(store Handle, prevContext *CertContext) (context *CertContext, err error) [failretval==nil] = crypt32.CertEnumCertificatesInStore 213 //sys CertAddCertificateContextToStore(store Handle, certContext *CertContext, addDisposition uint32, storeContext **CertContext) (err error) = crypt32.CertAddCertificateContextToStore 214 //sys CertCloseStore(store Handle, flags uint32) (err error) = crypt32.CertCloseStore 215 //sys CertGetCertificateChain(engine Handle, leaf *CertContext, time *Filetime, additionalStore Handle, para *CertChainPara, flags uint32, reserved uintptr, chainCtx **CertChainContext) (err error) = crypt32.CertGetCertificateChain 216 //sys CertFreeCertificateChain(ctx *CertChainContext) = crypt32.CertFreeCertificateChain 217 //sys CertCreateCertificateContext(certEncodingType uint32, certEncoded *byte, encodedLen uint32) (context *CertContext, err error) [failretval==nil] = crypt32.CertCreateCertificateContext 218 //sys CertFreeCertificateContext(ctx *CertContext) (err error) = crypt32.CertFreeCertificateContext 219 //sys CertVerifyCertificateChainPolicy(policyOID uintptr, chain *CertChainContext, para *CertChainPolicyPara, status *CertChainPolicyStatus) (err error) = crypt32.CertVerifyCertificateChainPolicy 220 //sys RegOpenKeyEx(key Handle, subkey *uint16, options uint32, desiredAccess uint32, result *Handle) (regerrno error) = advapi32.RegOpenKeyExW 221 //sys RegCloseKey(key Handle) (regerrno error) = advapi32.RegCloseKey 222 //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 223 //sys RegEnumKeyEx(key Handle, index uint32, name *uint16, nameLen *uint32, reserved *uint32, class *uint16, classLen *uint32, lastWriteTime *Filetime) (regerrno error) = advapi32.RegEnumKeyExW 224 //sys RegQueryValueEx(key Handle, name *uint16, reserved *uint32, valtype *uint32, buf *byte, buflen *uint32) (regerrno error) = advapi32.RegQueryValueExW 225 //sys getCurrentProcessId() (pid uint32) = kernel32.GetCurrentProcessId 226 //sys GetConsoleMode(console Handle, mode *uint32) (err error) = kernel32.GetConsoleMode 227 //sys WriteConsole(console Handle, buf *uint16, towrite uint32, written *uint32, reserved *byte) (err error) = kernel32.WriteConsoleW 228 //sys ReadConsole(console Handle, buf *uint16, toread uint32, read *uint32, inputControl *byte) (err error) = kernel32.ReadConsoleW 229 //sys CreateToolhelp32Snapshot(flags uint32, processId uint32) (handle Handle, err error) [failretval==InvalidHandle] = kernel32.CreateToolhelp32Snapshot 230 //sys Process32First(snapshot Handle, procEntry *ProcessEntry32) (err error) = kernel32.Process32FirstW 231 //sys Process32Next(snapshot Handle, procEntry *ProcessEntry32) (err error) = kernel32.Process32NextW 232 //sys DeviceIoControl(handle Handle, ioControlCode uint32, inBuffer *byte, inBufferSize uint32, outBuffer *byte, outBufferSize uint32, bytesReturned *uint32, overlapped *Overlapped) (err error) 233 // This function returns 1 byte BOOLEAN rather than the 4 byte BOOL. 234 //sys CreateSymbolicLink(symlinkfilename *uint16, targetfilename *uint16, flags uint32) (err error) [failretval&0xff==0] = CreateSymbolicLinkW 235 //sys CreateHardLink(filename *uint16, existingfilename *uint16, reserved uintptr) (err error) [failretval&0xff==0] = CreateHardLinkW 236 237 // syscall interface implementation for other packages 238 239 func makeInheritSa() *SecurityAttributes { 240 var sa SecurityAttributes 241 sa.Length = uint32(unsafe.Sizeof(sa)) 242 sa.InheritHandle = 1 243 return &sa 244 } 245 246 func Open(path string, mode int, perm uint32) (fd Handle, err error) { 247 if len(path) == 0 { 248 return InvalidHandle, ERROR_FILE_NOT_FOUND 249 } 250 pathp, err := UTF16PtrFromString(path) 251 if err != nil { 252 return InvalidHandle, err 253 } 254 var access uint32 255 switch mode & (O_RDONLY | O_WRONLY | O_RDWR) { 256 case O_RDONLY: 257 access = GENERIC_READ 258 case O_WRONLY: 259 access = GENERIC_WRITE 260 case O_RDWR: 261 access = GENERIC_READ | GENERIC_WRITE 262 } 263 if mode&O_CREAT != 0 { 264 access |= GENERIC_WRITE 265 } 266 if mode&O_APPEND != 0 { 267 access &^= GENERIC_WRITE 268 access |= FILE_APPEND_DATA 269 } 270 sharemode := uint32(FILE_SHARE_READ | FILE_SHARE_WRITE) 271 var sa *SecurityAttributes 272 if mode&O_CLOEXEC == 0 { 273 sa = makeInheritSa() 274 } 275 var createmode uint32 276 switch { 277 case mode&(O_CREAT|O_EXCL) == (O_CREAT | O_EXCL): 278 createmode = CREATE_NEW 279 case mode&(O_CREAT|O_TRUNC) == (O_CREAT | O_TRUNC): 280 createmode = CREATE_ALWAYS 281 case mode&O_CREAT == O_CREAT: 282 createmode = OPEN_ALWAYS 283 case mode&O_TRUNC == O_TRUNC: 284 createmode = TRUNCATE_EXISTING 285 default: 286 createmode = OPEN_EXISTING 287 } 288 h, e := CreateFile(pathp, access, sharemode, sa, createmode, FILE_ATTRIBUTE_NORMAL, 0) 289 return h, e 290 } 291 292 func Read(fd Handle, p []byte) (n int, err error) { 293 var done uint32 294 e := ReadFile(fd, p, &done, nil) 295 if e != nil { 296 if e == ERROR_BROKEN_PIPE { 297 // NOTE(brainman): work around ERROR_BROKEN_PIPE is returned on reading EOF from stdin 298 return 0, nil 299 } 300 return 0, e 301 } 302 if race.Enabled { 303 if done > 0 { 304 race.WriteRange(unsafe.Pointer(&p[0]), int(done)) 305 } 306 race.Acquire(unsafe.Pointer(&ioSync)) 307 } 308 if msanenabled && done > 0 { 309 msanWrite(unsafe.Pointer(&p[0]), int(done)) 310 } 311 return int(done), nil 312 } 313 314 func Write(fd Handle, p []byte) (n int, err error) { 315 if race.Enabled { 316 race.ReleaseMerge(unsafe.Pointer(&ioSync)) 317 } 318 var done uint32 319 e := WriteFile(fd, p, &done, nil) 320 if e != nil { 321 return 0, e 322 } 323 if race.Enabled && done > 0 { 324 race.ReadRange(unsafe.Pointer(&p[0]), int(done)) 325 } 326 if msanenabled && done > 0 { 327 msanRead(unsafe.Pointer(&p[0]), int(done)) 328 } 329 return int(done), nil 330 } 331 332 var ioSync int64 333 334 func Seek(fd Handle, offset int64, whence int) (newoffset int64, err error) { 335 var w uint32 336 switch whence { 337 case 0: 338 w = FILE_BEGIN 339 case 1: 340 w = FILE_CURRENT 341 case 2: 342 w = FILE_END 343 } 344 hi := int32(offset >> 32) 345 lo := int32(offset) 346 // use GetFileType to check pipe, pipe can't do seek 347 ft, _ := GetFileType(fd) 348 if ft == FILE_TYPE_PIPE { 349 return 0, ESPIPE 350 } 351 rlo, e := SetFilePointer(fd, lo, &hi, w) 352 if e != nil { 353 return 0, e 354 } 355 return int64(hi)<<32 + int64(rlo), nil 356 } 357 358 func Close(fd Handle) (err error) { 359 return CloseHandle(fd) 360 } 361 362 var ( 363 Stdin = getStdHandle(STD_INPUT_HANDLE) 364 Stdout = getStdHandle(STD_OUTPUT_HANDLE) 365 Stderr = getStdHandle(STD_ERROR_HANDLE) 366 ) 367 368 func getStdHandle(h int) (fd Handle) { 369 r, _ := GetStdHandle(h) 370 CloseOnExec(r) 371 return r 372 } 373 374 const ImplementsGetwd = true 375 376 func Getwd() (wd string, err error) { 377 b := make([]uint16, 300) 378 n, e := GetCurrentDirectory(uint32(len(b)), &b[0]) 379 if e != nil { 380 return "", e 381 } 382 return string(utf16.Decode(b[0:n])), nil 383 } 384 385 func Chdir(path string) (err error) { 386 pathp, err := UTF16PtrFromString(path) 387 if err != nil { 388 return err 389 } 390 return SetCurrentDirectory(pathp) 391 } 392 393 func Mkdir(path string, mode uint32) (err error) { 394 pathp, err := UTF16PtrFromString(path) 395 if err != nil { 396 return err 397 } 398 return CreateDirectory(pathp, nil) 399 } 400 401 func Rmdir(path string) (err error) { 402 pathp, err := UTF16PtrFromString(path) 403 if err != nil { 404 return err 405 } 406 return RemoveDirectory(pathp) 407 } 408 409 func Unlink(path string) (err error) { 410 pathp, err := UTF16PtrFromString(path) 411 if err != nil { 412 return err 413 } 414 return DeleteFile(pathp) 415 } 416 417 func Rename(oldpath, newpath string) (err error) { 418 from, err := UTF16PtrFromString(oldpath) 419 if err != nil { 420 return err 421 } 422 to, err := UTF16PtrFromString(newpath) 423 if err != nil { 424 return err 425 } 426 return MoveFile(from, to) 427 } 428 429 func ComputerName() (name string, err error) { 430 var n uint32 = MAX_COMPUTERNAME_LENGTH + 1 431 b := make([]uint16, n) 432 e := GetComputerName(&b[0], &n) 433 if e != nil { 434 return "", e 435 } 436 return string(utf16.Decode(b[0:n])), nil 437 } 438 439 func Ftruncate(fd Handle, length int64) (err error) { 440 curoffset, e := Seek(fd, 0, 1) 441 if e != nil { 442 return e 443 } 444 defer Seek(fd, curoffset, 0) 445 _, e = Seek(fd, length, 0) 446 if e != nil { 447 return e 448 } 449 e = SetEndOfFile(fd) 450 if e != nil { 451 return e 452 } 453 return nil 454 } 455 456 func Gettimeofday(tv *Timeval) (err error) { 457 var ft Filetime 458 GetSystemTimeAsFileTime(&ft) 459 *tv = NsecToTimeval(ft.Nanoseconds()) 460 return nil 461 } 462 463 func Pipe(p []Handle) (err error) { 464 if len(p) != 2 { 465 return EINVAL 466 } 467 var r, w Handle 468 e := CreatePipe(&r, &w, makeInheritSa(), 0) 469 if e != nil { 470 return e 471 } 472 p[0] = r 473 p[1] = w 474 return nil 475 } 476 477 func Utimes(path string, tv []Timeval) (err error) { 478 if len(tv) != 2 { 479 return EINVAL 480 } 481 pathp, e := UTF16PtrFromString(path) 482 if e != nil { 483 return e 484 } 485 h, e := CreateFile(pathp, 486 FILE_WRITE_ATTRIBUTES, FILE_SHARE_WRITE, nil, 487 OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0) 488 if e != nil { 489 return e 490 } 491 defer Close(h) 492 a := NsecToFiletime(tv[0].Nanoseconds()) 493 w := NsecToFiletime(tv[1].Nanoseconds()) 494 return SetFileTime(h, nil, &a, &w) 495 } 496 497 func UtimesNano(path string, ts []Timespec) (err error) { 498 if len(ts) != 2 { 499 return EINVAL 500 } 501 pathp, e := UTF16PtrFromString(path) 502 if e != nil { 503 return e 504 } 505 h, e := CreateFile(pathp, 506 FILE_WRITE_ATTRIBUTES, FILE_SHARE_WRITE, nil, 507 OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0) 508 if e != nil { 509 return e 510 } 511 defer Close(h) 512 a := NsecToFiletime(TimespecToNsec(ts[0])) 513 w := NsecToFiletime(TimespecToNsec(ts[1])) 514 return SetFileTime(h, nil, &a, &w) 515 } 516 517 func Fsync(fd Handle) (err error) { 518 return FlushFileBuffers(fd) 519 } 520 521 func Chmod(path string, mode uint32) (err error) { 522 if mode == 0 { 523 return EINVAL 524 } 525 p, e := UTF16PtrFromString(path) 526 if e != nil { 527 return e 528 } 529 attrs, e := GetFileAttributes(p) 530 if e != nil { 531 return e 532 } 533 if mode&S_IWRITE != 0 { 534 attrs &^= FILE_ATTRIBUTE_READONLY 535 } else { 536 attrs |= FILE_ATTRIBUTE_READONLY 537 } 538 return SetFileAttributes(p, attrs) 539 } 540 541 func LoadCancelIoEx() error { 542 return procCancelIoEx.Find() 543 } 544 545 func LoadSetFileCompletionNotificationModes() error { 546 return procSetFileCompletionNotificationModes.Find() 547 } 548 549 // net api calls 550 551 const socket_error = uintptr(^uint32(0)) 552 553 //sys WSAStartup(verreq uint32, data *WSAData) (sockerr error) = ws2_32.WSAStartup 554 //sys WSACleanup() (err error) [failretval==socket_error] = ws2_32.WSACleanup 555 //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 556 //sys socket(af int32, typ int32, protocol int32) (handle Handle, err error) [failretval==InvalidHandle] = ws2_32.socket 557 //sys Setsockopt(s Handle, level int32, optname int32, optval *byte, optlen int32) (err error) [failretval==socket_error] = ws2_32.setsockopt 558 //sys Getsockopt(s Handle, level int32, optname int32, optval *byte, optlen *int32) (err error) [failretval==socket_error] = ws2_32.getsockopt 559 //sys bind(s Handle, name unsafe.Pointer, namelen int32) (err error) [failretval==socket_error] = ws2_32.bind 560 //sys connect(s Handle, name unsafe.Pointer, namelen int32) (err error) [failretval==socket_error] = ws2_32.connect 561 //sys getsockname(s Handle, rsa *RawSockaddrAny, addrlen *int32) (err error) [failretval==socket_error] = ws2_32.getsockname 562 //sys getpeername(s Handle, rsa *RawSockaddrAny, addrlen *int32) (err error) [failretval==socket_error] = ws2_32.getpeername 563 //sys listen(s Handle, backlog int32) (err error) [failretval==socket_error] = ws2_32.listen 564 //sys shutdown(s Handle, how int32) (err error) [failretval==socket_error] = ws2_32.shutdown 565 //sys Closesocket(s Handle) (err error) [failretval==socket_error] = ws2_32.closesocket 566 //sys AcceptEx(ls Handle, as Handle, buf *byte, rxdatalen uint32, laddrlen uint32, raddrlen uint32, recvd *uint32, overlapped *Overlapped) (err error) = mswsock.AcceptEx 567 //sys GetAcceptExSockaddrs(buf *byte, rxdatalen uint32, laddrlen uint32, raddrlen uint32, lrsa **RawSockaddrAny, lrsalen *int32, rrsa **RawSockaddrAny, rrsalen *int32) = mswsock.GetAcceptExSockaddrs 568 //sys WSARecv(s Handle, bufs *WSABuf, bufcnt uint32, recvd *uint32, flags *uint32, overlapped *Overlapped, croutine *byte) (err error) [failretval==socket_error] = ws2_32.WSARecv 569 //sys WSASend(s Handle, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, overlapped *Overlapped, croutine *byte) (err error) [failretval==socket_error] = ws2_32.WSASend 570 //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 571 //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 572 //sys GetHostByName(name string) (h *Hostent, err error) [failretval==nil] = ws2_32.gethostbyname 573 //sys GetServByName(name string, proto string) (s *Servent, err error) [failretval==nil] = ws2_32.getservbyname 574 //sys Ntohs(netshort uint16) (u uint16) = ws2_32.ntohs 575 //sys GetProtoByName(name string) (p *Protoent, err error) [failretval==nil] = ws2_32.getprotobyname 576 //sys DnsQuery(name string, qtype uint16, options uint32, extra *byte, qrs **DNSRecord, pr *byte) (status error) = dnsapi.DnsQuery_W 577 //sys DnsRecordListFree(rl *DNSRecord, freetype uint32) = dnsapi.DnsRecordListFree 578 //sys DnsNameCompare(name1 *uint16, name2 *uint16) (same bool) = dnsapi.DnsNameCompare_W 579 //sys GetAddrInfoW(nodename *uint16, servicename *uint16, hints *AddrinfoW, result **AddrinfoW) (sockerr error) = ws2_32.GetAddrInfoW 580 //sys FreeAddrInfoW(addrinfo *AddrinfoW) = ws2_32.FreeAddrInfoW 581 //sys GetIfEntry(pIfRow *MibIfRow) (errcode error) = iphlpapi.GetIfEntry 582 //sys GetAdaptersInfo(ai *IpAdapterInfo, ol *uint32) (errcode error) = iphlpapi.GetAdaptersInfo 583 //sys SetFileCompletionNotificationModes(handle Handle, flags uint8) (err error) = kernel32.SetFileCompletionNotificationModes 584 //sys WSAEnumProtocols(protocols *int32, protocolBuffer *WSAProtocolInfo, bufferLength *uint32) (n int32, err error) [failretval==-1] = ws2_32.WSAEnumProtocolsW 585 586 // For testing: clients can set this flag to force 587 // creation of IPv6 sockets to return EAFNOSUPPORT. 588 var SocketDisableIPv6 bool 589 590 type RawSockaddrInet4 struct { 591 Family uint16 592 Port uint16 593 Addr [4]byte /* in_addr */ 594 Zero [8]uint8 595 } 596 597 type RawSockaddrInet6 struct { 598 Family uint16 599 Port uint16 600 Flowinfo uint32 601 Addr [16]byte /* in6_addr */ 602 Scope_id uint32 603 } 604 605 type RawSockaddr struct { 606 Family uint16 607 Data [14]int8 608 } 609 610 type RawSockaddrAny struct { 611 Addr RawSockaddr 612 Pad [96]int8 613 } 614 615 type Sockaddr interface { 616 sockaddr() (ptr unsafe.Pointer, len int32, err error) // lowercase; only we can define Sockaddrs 617 } 618 619 type SockaddrInet4 struct { 620 Port int 621 Addr [4]byte 622 raw RawSockaddrInet4 623 } 624 625 func (sa *SockaddrInet4) sockaddr() (unsafe.Pointer, int32, error) { 626 if sa.Port < 0 || sa.Port > 0xFFFF { 627 return nil, 0, EINVAL 628 } 629 sa.raw.Family = AF_INET 630 p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port)) 631 p[0] = byte(sa.Port >> 8) 632 p[1] = byte(sa.Port) 633 for i := 0; i < len(sa.Addr); i++ { 634 sa.raw.Addr[i] = sa.Addr[i] 635 } 636 return unsafe.Pointer(&sa.raw), int32(unsafe.Sizeof(sa.raw)), nil 637 } 638 639 type SockaddrInet6 struct { 640 Port int 641 ZoneId uint32 642 Addr [16]byte 643 raw RawSockaddrInet6 644 } 645 646 func (sa *SockaddrInet6) sockaddr() (unsafe.Pointer, int32, error) { 647 if sa.Port < 0 || sa.Port > 0xFFFF { 648 return nil, 0, EINVAL 649 } 650 sa.raw.Family = AF_INET6 651 p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port)) 652 p[0] = byte(sa.Port >> 8) 653 p[1] = byte(sa.Port) 654 sa.raw.Scope_id = sa.ZoneId 655 for i := 0; i < len(sa.Addr); i++ { 656 sa.raw.Addr[i] = sa.Addr[i] 657 } 658 return unsafe.Pointer(&sa.raw), int32(unsafe.Sizeof(sa.raw)), nil 659 } 660 661 type SockaddrUnix struct { 662 Name string 663 } 664 665 func (sa *SockaddrUnix) sockaddr() (unsafe.Pointer, int32, error) { 666 // TODO(brainman): implement SockaddrUnix.sockaddr() 667 return nil, 0, EWINDOWS 668 } 669 670 func (rsa *RawSockaddrAny) Sockaddr() (Sockaddr, error) { 671 switch rsa.Addr.Family { 672 case AF_UNIX: 673 return nil, EWINDOWS 674 675 case AF_INET: 676 pp := (*RawSockaddrInet4)(unsafe.Pointer(rsa)) 677 sa := new(SockaddrInet4) 678 p := (*[2]byte)(unsafe.Pointer(&pp.Port)) 679 sa.Port = int(p[0])<<8 + int(p[1]) 680 for i := 0; i < len(sa.Addr); i++ { 681 sa.Addr[i] = pp.Addr[i] 682 } 683 return sa, nil 684 685 case AF_INET6: 686 pp := (*RawSockaddrInet6)(unsafe.Pointer(rsa)) 687 sa := new(SockaddrInet6) 688 p := (*[2]byte)(unsafe.Pointer(&pp.Port)) 689 sa.Port = int(p[0])<<8 + int(p[1]) 690 sa.ZoneId = pp.Scope_id 691 for i := 0; i < len(sa.Addr); i++ { 692 sa.Addr[i] = pp.Addr[i] 693 } 694 return sa, nil 695 } 696 return nil, EAFNOSUPPORT 697 } 698 699 func Socket(domain, typ, proto int) (fd Handle, err error) { 700 if domain == AF_INET6 && SocketDisableIPv6 { 701 return InvalidHandle, EAFNOSUPPORT 702 } 703 return socket(int32(domain), int32(typ), int32(proto)) 704 } 705 706 func SetsockoptInt(fd Handle, level, opt int, value int) (err error) { 707 v := int32(value) 708 return Setsockopt(fd, int32(level), int32(opt), (*byte)(unsafe.Pointer(&v)), int32(unsafe.Sizeof(v))) 709 } 710 711 func Bind(fd Handle, sa Sockaddr) (err error) { 712 ptr, n, err := sa.sockaddr() 713 if err != nil { 714 return err 715 } 716 return bind(fd, ptr, n) 717 } 718 719 func Connect(fd Handle, sa Sockaddr) (err error) { 720 ptr, n, err := sa.sockaddr() 721 if err != nil { 722 return err 723 } 724 return connect(fd, ptr, n) 725 } 726 727 func Getsockname(fd Handle) (sa Sockaddr, err error) { 728 var rsa RawSockaddrAny 729 l := int32(unsafe.Sizeof(rsa)) 730 if err = getsockname(fd, &rsa, &l); err != nil { 731 return 732 } 733 return rsa.Sockaddr() 734 } 735 736 func Getpeername(fd Handle) (sa Sockaddr, err error) { 737 var rsa RawSockaddrAny 738 l := int32(unsafe.Sizeof(rsa)) 739 if err = getpeername(fd, &rsa, &l); err != nil { 740 return 741 } 742 return rsa.Sockaddr() 743 } 744 745 func Listen(s Handle, n int) (err error) { 746 return listen(s, int32(n)) 747 } 748 749 func Shutdown(fd Handle, how int) (err error) { 750 return shutdown(fd, int32(how)) 751 } 752 753 func WSASendto(s Handle, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, to Sockaddr, overlapped *Overlapped, croutine *byte) (err error) { 754 rsa, l, err := to.sockaddr() 755 if err != nil { 756 return err 757 } 758 return WSASendTo(s, bufs, bufcnt, sent, flags, (*RawSockaddrAny)(unsafe.Pointer(rsa)), l, overlapped, croutine) 759 } 760 761 func LoadGetAddrInfo() error { 762 return procGetAddrInfoW.Find() 763 } 764 765 var connectExFunc struct { 766 once sync.Once 767 addr uintptr 768 err error 769 } 770 771 func LoadConnectEx() error { 772 connectExFunc.once.Do(func() { 773 var s Handle 774 s, connectExFunc.err = Socket(AF_INET, SOCK_STREAM, IPPROTO_TCP) 775 if connectExFunc.err != nil { 776 return 777 } 778 defer CloseHandle(s) 779 var n uint32 780 connectExFunc.err = WSAIoctl(s, 781 SIO_GET_EXTENSION_FUNCTION_POINTER, 782 (*byte)(unsafe.Pointer(&WSAID_CONNECTEX)), 783 uint32(unsafe.Sizeof(WSAID_CONNECTEX)), 784 (*byte)(unsafe.Pointer(&connectExFunc.addr)), 785 uint32(unsafe.Sizeof(connectExFunc.addr)), 786 &n, nil, 0) 787 }) 788 return connectExFunc.err 789 } 790 791 func connectEx(s Handle, name unsafe.Pointer, namelen int32, sendBuf *byte, sendDataLen uint32, bytesSent *uint32, overlapped *Overlapped) (err error) { 792 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) 793 if r1 == 0 { 794 if e1 != 0 { 795 err = error(e1) 796 } else { 797 err = EINVAL 798 } 799 } 800 return 801 } 802 803 func ConnectEx(fd Handle, sa Sockaddr, sendBuf *byte, sendDataLen uint32, bytesSent *uint32, overlapped *Overlapped) error { 804 err := LoadConnectEx() 805 if err != nil { 806 return errorspkg.New("failed to find ConnectEx: " + err.Error()) 807 } 808 ptr, n, err := sa.sockaddr() 809 if err != nil { 810 return err 811 } 812 return connectEx(fd, ptr, n, sendBuf, sendDataLen, bytesSent, overlapped) 813 } 814 815 // Invented structures to support what package os expects. 816 type Rusage struct { 817 CreationTime Filetime 818 ExitTime Filetime 819 KernelTime Filetime 820 UserTime Filetime 821 } 822 823 type WaitStatus struct { 824 ExitCode uint32 825 } 826 827 func (w WaitStatus) Exited() bool { return true } 828 829 func (w WaitStatus) ExitStatus() int { return int(w.ExitCode) } 830 831 func (w WaitStatus) Signal() Signal { return -1 } 832 833 func (w WaitStatus) CoreDump() bool { return false } 834 835 func (w WaitStatus) Stopped() bool { return false } 836 837 func (w WaitStatus) Continued() bool { return false } 838 839 func (w WaitStatus) StopSignal() Signal { return -1 } 840 841 func (w WaitStatus) Signaled() bool { return false } 842 843 func (w WaitStatus) TrapCause() int { return -1 } 844 845 // Timespec is an invented structure on Windows, but here for 846 // consistency with the syscall package for other operating systems. 847 type Timespec struct { 848 Sec int64 849 Nsec int64 850 } 851 852 func TimespecToNsec(ts Timespec) int64 { return int64(ts.Sec)*1e9 + int64(ts.Nsec) } 853 854 func NsecToTimespec(nsec int64) (ts Timespec) { 855 ts.Sec = nsec / 1e9 856 ts.Nsec = nsec % 1e9 857 return 858 } 859 860 // TODO(brainman): fix all needed for net 861 862 func Accept(fd Handle) (nfd Handle, sa Sockaddr, err error) { return 0, nil, EWINDOWS } 863 func Recvfrom(fd Handle, p []byte, flags int) (n int, from Sockaddr, err error) { 864 return 0, nil, EWINDOWS 865 } 866 func Sendto(fd Handle, p []byte, flags int, to Sockaddr) (err error) { return EWINDOWS } 867 func SetsockoptTimeval(fd Handle, level, opt int, tv *Timeval) (err error) { return EWINDOWS } 868 869 // The Linger struct is wrong but we only noticed after Go 1. 870 // sysLinger is the real system call structure. 871 872 // BUG(brainman): The definition of Linger is not appropriate for direct use 873 // with Setsockopt and Getsockopt. 874 // Use SetsockoptLinger instead. 875 876 type Linger struct { 877 Onoff int32 878 Linger int32 879 } 880 881 type sysLinger struct { 882 Onoff uint16 883 Linger uint16 884 } 885 886 type IPMreq struct { 887 Multiaddr [4]byte /* in_addr */ 888 Interface [4]byte /* in_addr */ 889 } 890 891 type IPv6Mreq struct { 892 Multiaddr [16]byte /* in6_addr */ 893 Interface uint32 894 } 895 896 func GetsockoptInt(fd Handle, level, opt int) (int, error) { return -1, EWINDOWS } 897 898 func SetsockoptLinger(fd Handle, level, opt int, l *Linger) (err error) { 899 sys := sysLinger{Onoff: uint16(l.Onoff), Linger: uint16(l.Linger)} 900 return Setsockopt(fd, int32(level), int32(opt), (*byte)(unsafe.Pointer(&sys)), int32(unsafe.Sizeof(sys))) 901 } 902 903 func SetsockoptInet4Addr(fd Handle, level, opt int, value [4]byte) (err error) { 904 return Setsockopt(fd, int32(level), int32(opt), (*byte)(unsafe.Pointer(&value[0])), 4) 905 } 906 func SetsockoptIPMreq(fd Handle, level, opt int, mreq *IPMreq) (err error) { 907 return Setsockopt(fd, int32(level), int32(opt), (*byte)(unsafe.Pointer(mreq)), int32(unsafe.Sizeof(*mreq))) 908 } 909 func SetsockoptIPv6Mreq(fd Handle, level, opt int, mreq *IPv6Mreq) (err error) { return EWINDOWS } 910 911 func Getpid() (pid int) { return int(getCurrentProcessId()) } 912 913 func FindFirstFile(name *uint16, data *Win32finddata) (handle Handle, err error) { 914 // NOTE(rsc): The Win32finddata struct is wrong for the system call: 915 // the two paths are each one uint16 short. Use the correct struct, 916 // a win32finddata1, and then copy the results out. 917 // There is no loss of expressivity here, because the final 918 // uint16, if it is used, is supposed to be a NUL, and Go doesn't need that. 919 // For Go 1.1, we might avoid the allocation of win32finddata1 here 920 // by adding a final Bug [2]uint16 field to the struct and then 921 // adjusting the fields in the result directly. 922 var data1 win32finddata1 923 handle, err = findFirstFile1(name, &data1) 924 if err == nil { 925 copyFindData(data, &data1) 926 } 927 return 928 } 929 930 func FindNextFile(handle Handle, data *Win32finddata) (err error) { 931 var data1 win32finddata1 932 err = findNextFile1(handle, &data1) 933 if err == nil { 934 copyFindData(data, &data1) 935 } 936 return 937 } 938 939 func getProcessEntry(pid int) (*ProcessEntry32, error) { 940 snapshot, err := CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0) 941 if err != nil { 942 return nil, err 943 } 944 defer CloseHandle(snapshot) 945 var procEntry ProcessEntry32 946 procEntry.Size = uint32(unsafe.Sizeof(procEntry)) 947 if err = Process32First(snapshot, &procEntry); err != nil { 948 return nil, err 949 } 950 for { 951 if procEntry.ProcessID == uint32(pid) { 952 return &procEntry, nil 953 } 954 err = Process32Next(snapshot, &procEntry) 955 if err != nil { 956 return nil, err 957 } 958 } 959 } 960 961 func Getppid() (ppid int) { 962 pe, err := getProcessEntry(Getpid()) 963 if err != nil { 964 return -1 965 } 966 return int(pe.ParentProcessID) 967 } 968 969 // TODO(brainman): fix all needed for os 970 func Fchdir(fd Handle) (err error) { return EWINDOWS } 971 func Link(oldpath, newpath string) (err error) { return EWINDOWS } 972 func Symlink(path, link string) (err error) { return EWINDOWS } 973 974 func Fchmod(fd Handle, mode uint32) (err error) { return EWINDOWS } 975 func Chown(path string, uid int, gid int) (err error) { return EWINDOWS } 976 func Lchown(path string, uid int, gid int) (err error) { return EWINDOWS } 977 func Fchown(fd Handle, uid int, gid int) (err error) { return EWINDOWS } 978 979 func Getuid() (uid int) { return -1 } 980 func Geteuid() (euid int) { return -1 } 981 func Getgid() (gid int) { return -1 } 982 func Getegid() (egid int) { return -1 } 983 func Getgroups() (gids []int, err error) { return nil, EWINDOWS } 984 985 type Signal int 986 987 func (s Signal) Signal() {} 988 989 func (s Signal) String() string { 990 if 0 <= s && int(s) < len(signals) { 991 str := signals[s] 992 if str != "" { 993 return str 994 } 995 } 996 return "signal " + itoa(int(s)) 997 } 998 999 func LoadCreateSymbolicLink() error { 1000 return procCreateSymbolicLinkW.Find() 1001 } 1002 1003 // Readlink returns the destination of the named symbolic link. 1004 func Readlink(path string, buf []byte) (n int, err error) { 1005 fd, err := CreateFile(StringToUTF16Ptr(path), GENERIC_READ, 0, nil, OPEN_EXISTING, 1006 FILE_FLAG_OPEN_REPARSE_POINT|FILE_FLAG_BACKUP_SEMANTICS, 0) 1007 if err != nil { 1008 return -1, err 1009 } 1010 defer CloseHandle(fd) 1011 1012 rdbbuf := make([]byte, MAXIMUM_REPARSE_DATA_BUFFER_SIZE) 1013 var bytesReturned uint32 1014 err = DeviceIoControl(fd, FSCTL_GET_REPARSE_POINT, nil, 0, &rdbbuf[0], uint32(len(rdbbuf)), &bytesReturned, nil) 1015 if err != nil { 1016 return -1, err 1017 } 1018 1019 rdb := (*reparseDataBuffer)(unsafe.Pointer(&rdbbuf[0])) 1020 var s string 1021 switch rdb.ReparseTag { 1022 case IO_REPARSE_TAG_SYMLINK: 1023 data := (*symbolicLinkReparseBuffer)(unsafe.Pointer(&rdb.reparseBuffer)) 1024 p := (*[0xffff]uint16)(unsafe.Pointer(&data.PathBuffer[0])) 1025 s = UTF16ToString(p[data.SubstituteNameOffset/2 : (data.SubstituteNameOffset+data.SubstituteNameLength)/2]) 1026 if data.Flags&_SYMLINK_FLAG_RELATIVE == 0 { 1027 if len(s) >= 4 && s[:4] == `\??\` { 1028 s = s[4:] 1029 switch { 1030 case len(s) >= 2 && s[1] == ':': // \??\C:\foo\bar 1031 // do nothing 1032 case len(s) >= 4 && s[:4] == `UNC\`: // \??\UNC\foo\bar 1033 s = `\\` + s[4:] 1034 default: 1035 // unexpected; do nothing 1036 } 1037 } else { 1038 // unexpected; do nothing 1039 } 1040 } 1041 case _IO_REPARSE_TAG_MOUNT_POINT: 1042 data := (*mountPointReparseBuffer)(unsafe.Pointer(&rdb.reparseBuffer)) 1043 p := (*[0xffff]uint16)(unsafe.Pointer(&data.PathBuffer[0])) 1044 s = UTF16ToString(p[data.SubstituteNameOffset/2 : (data.SubstituteNameOffset+data.SubstituteNameLength)/2]) 1045 if len(s) >= 4 && s[:4] == `\??\` { // \??\C:\foo\bar 1046 s = s[4:] 1047 } else { 1048 // unexpected; do nothing 1049 } 1050 default: 1051 // the path is not a symlink or junction but another type of reparse 1052 // point 1053 return -1, ENOENT 1054 } 1055 n = copy(buf, []byte(s)) 1056 1057 return n, nil 1058 }