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 // If s 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.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 Exit(code int) { ExitProcess(uint32(code)) } 240 241 func makeInheritSa() *SecurityAttributes { 242 var sa SecurityAttributes 243 sa.Length = uint32(unsafe.Sizeof(sa)) 244 sa.InheritHandle = 1 245 return &sa 246 } 247 248 func Open(path string, mode int, perm uint32) (fd Handle, err error) { 249 if len(path) == 0 { 250 return InvalidHandle, ERROR_FILE_NOT_FOUND 251 } 252 pathp, err := UTF16PtrFromString(path) 253 if err != nil { 254 return InvalidHandle, err 255 } 256 var access uint32 257 switch mode & (O_RDONLY | O_WRONLY | O_RDWR) { 258 case O_RDONLY: 259 access = GENERIC_READ 260 case O_WRONLY: 261 access = GENERIC_WRITE 262 case O_RDWR: 263 access = GENERIC_READ | GENERIC_WRITE 264 } 265 if mode&O_CREAT != 0 { 266 access |= GENERIC_WRITE 267 } 268 if mode&O_APPEND != 0 { 269 access &^= GENERIC_WRITE 270 access |= FILE_APPEND_DATA 271 } 272 sharemode := uint32(FILE_SHARE_READ | FILE_SHARE_WRITE) 273 var sa *SecurityAttributes 274 if mode&O_CLOEXEC == 0 { 275 sa = makeInheritSa() 276 } 277 var createmode uint32 278 switch { 279 case mode&(O_CREAT|O_EXCL) == (O_CREAT | O_EXCL): 280 createmode = CREATE_NEW 281 case mode&(O_CREAT|O_TRUNC) == (O_CREAT | O_TRUNC): 282 createmode = CREATE_ALWAYS 283 case mode&O_CREAT == O_CREAT: 284 createmode = OPEN_ALWAYS 285 case mode&O_TRUNC == O_TRUNC: 286 createmode = TRUNCATE_EXISTING 287 default: 288 createmode = OPEN_EXISTING 289 } 290 h, e := CreateFile(pathp, access, sharemode, sa, createmode, FILE_ATTRIBUTE_NORMAL, 0) 291 return h, e 292 } 293 294 func Read(fd Handle, p []byte) (n int, err error) { 295 var done uint32 296 e := ReadFile(fd, p, &done, nil) 297 if e != nil { 298 if e == ERROR_BROKEN_PIPE { 299 // NOTE(brainman): work around ERROR_BROKEN_PIPE is returned on reading EOF from stdin 300 return 0, nil 301 } 302 return 0, e 303 } 304 if race.Enabled { 305 if done > 0 { 306 race.WriteRange(unsafe.Pointer(&p[0]), int(done)) 307 } 308 race.Acquire(unsafe.Pointer(&ioSync)) 309 } 310 if msanenabled && done > 0 { 311 msanWrite(unsafe.Pointer(&p[0]), int(done)) 312 } 313 return int(done), nil 314 } 315 316 func Write(fd Handle, p []byte) (n int, err error) { 317 if race.Enabled { 318 race.ReleaseMerge(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 race.Enabled && done > 0 { 326 race.ReadRange(unsafe.Pointer(&p[0]), int(done)) 327 } 328 if msanenabled && done > 0 { 329 msanRead(unsafe.Pointer(&p[0]), int(done)) 330 } 331 return int(done), nil 332 } 333 334 var ioSync int64 335 336 func Seek(fd Handle, offset int64, whence int) (newoffset int64, err error) { 337 var w uint32 338 switch whence { 339 case 0: 340 w = FILE_BEGIN 341 case 1: 342 w = FILE_CURRENT 343 case 2: 344 w = FILE_END 345 } 346 hi := int32(offset >> 32) 347 lo := int32(offset) 348 // use GetFileType to check pipe, pipe can't do seek 349 ft, _ := GetFileType(fd) 350 if ft == FILE_TYPE_PIPE { 351 return 0, EPIPE 352 } 353 rlo, e := SetFilePointer(fd, lo, &hi, w) 354 if e != nil { 355 return 0, e 356 } 357 return int64(hi)<<32 + int64(rlo), nil 358 } 359 360 func Close(fd Handle) (err error) { 361 return CloseHandle(fd) 362 } 363 364 var ( 365 Stdin = getStdHandle(STD_INPUT_HANDLE) 366 Stdout = getStdHandle(STD_OUTPUT_HANDLE) 367 Stderr = getStdHandle(STD_ERROR_HANDLE) 368 ) 369 370 func getStdHandle(h int) (fd Handle) { 371 r, _ := GetStdHandle(h) 372 CloseOnExec(r) 373 return r 374 } 375 376 const ImplementsGetwd = true 377 378 func Getwd() (wd string, err error) { 379 b := make([]uint16, 300) 380 n, e := GetCurrentDirectory(uint32(len(b)), &b[0]) 381 if e != nil { 382 return "", e 383 } 384 return string(utf16.Decode(b[0:n])), nil 385 } 386 387 func Chdir(path string) (err error) { 388 pathp, err := UTF16PtrFromString(path) 389 if err != nil { 390 return err 391 } 392 return SetCurrentDirectory(pathp) 393 } 394 395 func Mkdir(path string, mode uint32) (err error) { 396 pathp, err := UTF16PtrFromString(path) 397 if err != nil { 398 return err 399 } 400 return CreateDirectory(pathp, nil) 401 } 402 403 func Rmdir(path string) (err error) { 404 pathp, err := UTF16PtrFromString(path) 405 if err != nil { 406 return err 407 } 408 return RemoveDirectory(pathp) 409 } 410 411 func Unlink(path string) (err error) { 412 pathp, err := UTF16PtrFromString(path) 413 if err != nil { 414 return err 415 } 416 return DeleteFile(pathp) 417 } 418 419 func Rename(oldpath, newpath string) (err error) { 420 from, err := UTF16PtrFromString(oldpath) 421 if err != nil { 422 return err 423 } 424 to, err := UTF16PtrFromString(newpath) 425 if err != nil { 426 return err 427 } 428 return MoveFile(from, to) 429 } 430 431 func ComputerName() (name string, err error) { 432 var n uint32 = MAX_COMPUTERNAME_LENGTH + 1 433 b := make([]uint16, n) 434 e := GetComputerName(&b[0], &n) 435 if e != nil { 436 return "", e 437 } 438 return string(utf16.Decode(b[0:n])), nil 439 } 440 441 func Ftruncate(fd Handle, length int64) (err error) { 442 curoffset, e := Seek(fd, 0, 1) 443 if e != nil { 444 return e 445 } 446 defer Seek(fd, curoffset, 0) 447 _, e = Seek(fd, length, 0) 448 if e != nil { 449 return e 450 } 451 e = SetEndOfFile(fd) 452 if e != nil { 453 return e 454 } 455 return nil 456 } 457 458 func Gettimeofday(tv *Timeval) (err error) { 459 var ft Filetime 460 GetSystemTimeAsFileTime(&ft) 461 *tv = NsecToTimeval(ft.Nanoseconds()) 462 return nil 463 } 464 465 func Pipe(p []Handle) (err error) { 466 if len(p) != 2 { 467 return EINVAL 468 } 469 var r, w Handle 470 e := CreatePipe(&r, &w, makeInheritSa(), 0) 471 if e != nil { 472 return e 473 } 474 p[0] = r 475 p[1] = w 476 return nil 477 } 478 479 func Utimes(path string, tv []Timeval) (err error) { 480 if len(tv) != 2 { 481 return EINVAL 482 } 483 pathp, e := UTF16PtrFromString(path) 484 if e != nil { 485 return e 486 } 487 h, e := CreateFile(pathp, 488 FILE_WRITE_ATTRIBUTES, FILE_SHARE_WRITE, nil, 489 OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0) 490 if e != nil { 491 return e 492 } 493 defer Close(h) 494 a := NsecToFiletime(tv[0].Nanoseconds()) 495 w := NsecToFiletime(tv[1].Nanoseconds()) 496 return SetFileTime(h, nil, &a, &w) 497 } 498 499 func UtimesNano(path string, ts []Timespec) (err error) { 500 if len(ts) != 2 { 501 return EINVAL 502 } 503 pathp, e := UTF16PtrFromString(path) 504 if e != nil { 505 return e 506 } 507 h, e := CreateFile(pathp, 508 FILE_WRITE_ATTRIBUTES, FILE_SHARE_WRITE, nil, 509 OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0) 510 if e != nil { 511 return e 512 } 513 defer Close(h) 514 a := NsecToFiletime(TimespecToNsec(ts[0])) 515 w := NsecToFiletime(TimespecToNsec(ts[1])) 516 return SetFileTime(h, nil, &a, &w) 517 } 518 519 func Fsync(fd Handle) (err error) { 520 return FlushFileBuffers(fd) 521 } 522 523 func Chmod(path string, mode uint32) (err error) { 524 if mode == 0 { 525 return EINVAL 526 } 527 p, e := UTF16PtrFromString(path) 528 if e != nil { 529 return e 530 } 531 attrs, e := GetFileAttributes(p) 532 if e != nil { 533 return e 534 } 535 if mode&S_IWRITE != 0 { 536 attrs &^= FILE_ATTRIBUTE_READONLY 537 } else { 538 attrs |= FILE_ATTRIBUTE_READONLY 539 } 540 return SetFileAttributes(p, attrs) 541 } 542 543 func LoadCancelIoEx() error { 544 return procCancelIoEx.Find() 545 } 546 547 func LoadSetFileCompletionNotificationModes() error { 548 return procSetFileCompletionNotificationModes.Find() 549 } 550 551 // net api calls 552 553 const socket_error = uintptr(^uint32(0)) 554 555 //sys WSAStartup(verreq uint32, data *WSAData) (sockerr error) = ws2_32.WSAStartup 556 //sys WSACleanup() (err error) [failretval==socket_error] = ws2_32.WSACleanup 557 //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 558 //sys socket(af int32, typ int32, protocol int32) (handle Handle, err error) [failretval==InvalidHandle] = ws2_32.socket 559 //sys Setsockopt(s Handle, level int32, optname int32, optval *byte, optlen int32) (err error) [failretval==socket_error] = ws2_32.setsockopt 560 //sys Getsockopt(s Handle, level int32, optname int32, optval *byte, optlen *int32) (err error) [failretval==socket_error] = ws2_32.getsockopt 561 //sys bind(s Handle, name unsafe.Pointer, namelen int32) (err error) [failretval==socket_error] = ws2_32.bind 562 //sys connect(s Handle, name unsafe.Pointer, namelen int32) (err error) [failretval==socket_error] = ws2_32.connect 563 //sys getsockname(s Handle, rsa *RawSockaddrAny, addrlen *int32) (err error) [failretval==socket_error] = ws2_32.getsockname 564 //sys getpeername(s Handle, rsa *RawSockaddrAny, addrlen *int32) (err error) [failretval==socket_error] = ws2_32.getpeername 565 //sys listen(s Handle, backlog int32) (err error) [failretval==socket_error] = ws2_32.listen 566 //sys shutdown(s Handle, how int32) (err error) [failretval==socket_error] = ws2_32.shutdown 567 //sys Closesocket(s Handle) (err error) [failretval==socket_error] = ws2_32.closesocket 568 //sys AcceptEx(ls Handle, as Handle, buf *byte, rxdatalen uint32, laddrlen uint32, raddrlen uint32, recvd *uint32, overlapped *Overlapped) (err error) = mswsock.AcceptEx 569 //sys GetAcceptExSockaddrs(buf *byte, rxdatalen uint32, laddrlen uint32, raddrlen uint32, lrsa **RawSockaddrAny, lrsalen *int32, rrsa **RawSockaddrAny, rrsalen *int32) = mswsock.GetAcceptExSockaddrs 570 //sys WSARecv(s Handle, bufs *WSABuf, bufcnt uint32, recvd *uint32, flags *uint32, overlapped *Overlapped, croutine *byte) (err error) [failretval==socket_error] = ws2_32.WSARecv 571 //sys WSASend(s Handle, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, overlapped *Overlapped, croutine *byte) (err error) [failretval==socket_error] = ws2_32.WSASend 572 //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 573 //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 574 //sys GetHostByName(name string) (h *Hostent, err error) [failretval==nil] = ws2_32.gethostbyname 575 //sys GetServByName(name string, proto string) (s *Servent, err error) [failretval==nil] = ws2_32.getservbyname 576 //sys Ntohs(netshort uint16) (u uint16) = ws2_32.ntohs 577 //sys GetProtoByName(name string) (p *Protoent, err error) [failretval==nil] = ws2_32.getprotobyname 578 //sys DnsQuery(name string, qtype uint16, options uint32, extra *byte, qrs **DNSRecord, pr *byte) (status error) = dnsapi.DnsQuery_W 579 //sys DnsRecordListFree(rl *DNSRecord, freetype uint32) = dnsapi.DnsRecordListFree 580 //sys DnsNameCompare(name1 *uint16, name2 *uint16) (same bool) = dnsapi.DnsNameCompare_W 581 //sys GetAddrInfoW(nodename *uint16, servicename *uint16, hints *AddrinfoW, result **AddrinfoW) (sockerr error) = ws2_32.GetAddrInfoW 582 //sys FreeAddrInfoW(addrinfo *AddrinfoW) = ws2_32.FreeAddrInfoW 583 //sys GetIfEntry(pIfRow *MibIfRow) (errcode error) = iphlpapi.GetIfEntry 584 //sys GetAdaptersInfo(ai *IpAdapterInfo, ol *uint32) (errcode error) = iphlpapi.GetAdaptersInfo 585 //sys SetFileCompletionNotificationModes(handle Handle, flags uint8) (err error) = kernel32.SetFileCompletionNotificationModes 586 //sys WSAEnumProtocols(protocols *int32, protocolBuffer *WSAProtocolInfo, bufferLength *uint32) (n int32, err error) [failretval==-1] = ws2_32.WSAEnumProtocolsW 587 588 // For testing: clients can set this flag to force 589 // creation of IPv6 sockets to return EAFNOSUPPORT. 590 var SocketDisableIPv6 bool 591 592 type RawSockaddrInet4 struct { 593 Family uint16 594 Port uint16 595 Addr [4]byte /* in_addr */ 596 Zero [8]uint8 597 } 598 599 type RawSockaddrInet6 struct { 600 Family uint16 601 Port uint16 602 Flowinfo uint32 603 Addr [16]byte /* in6_addr */ 604 Scope_id uint32 605 } 606 607 type RawSockaddr struct { 608 Family uint16 609 Data [14]int8 610 } 611 612 type RawSockaddrAny struct { 613 Addr RawSockaddr 614 Pad [96]int8 615 } 616 617 type Sockaddr interface { 618 sockaddr() (ptr unsafe.Pointer, len int32, err error) // lowercase; only we can define Sockaddrs 619 } 620 621 type SockaddrInet4 struct { 622 Port int 623 Addr [4]byte 624 raw RawSockaddrInet4 625 } 626 627 func (sa *SockaddrInet4) sockaddr() (unsafe.Pointer, int32, error) { 628 if sa.Port < 0 || sa.Port > 0xFFFF { 629 return nil, 0, EINVAL 630 } 631 sa.raw.Family = AF_INET 632 p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port)) 633 p[0] = byte(sa.Port >> 8) 634 p[1] = byte(sa.Port) 635 for i := 0; i < len(sa.Addr); i++ { 636 sa.raw.Addr[i] = sa.Addr[i] 637 } 638 return unsafe.Pointer(&sa.raw), int32(unsafe.Sizeof(sa.raw)), nil 639 } 640 641 type SockaddrInet6 struct { 642 Port int 643 ZoneId uint32 644 Addr [16]byte 645 raw RawSockaddrInet6 646 } 647 648 func (sa *SockaddrInet6) sockaddr() (unsafe.Pointer, int32, error) { 649 if sa.Port < 0 || sa.Port > 0xFFFF { 650 return nil, 0, EINVAL 651 } 652 sa.raw.Family = AF_INET6 653 p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port)) 654 p[0] = byte(sa.Port >> 8) 655 p[1] = byte(sa.Port) 656 sa.raw.Scope_id = sa.ZoneId 657 for i := 0; i < len(sa.Addr); i++ { 658 sa.raw.Addr[i] = sa.Addr[i] 659 } 660 return unsafe.Pointer(&sa.raw), int32(unsafe.Sizeof(sa.raw)), nil 661 } 662 663 type SockaddrUnix struct { 664 Name string 665 } 666 667 func (sa *SockaddrUnix) sockaddr() (unsafe.Pointer, int32, error) { 668 // TODO(brainman): implement SockaddrUnix.sockaddr() 669 return nil, 0, EWINDOWS 670 } 671 672 func (rsa *RawSockaddrAny) Sockaddr() (Sockaddr, error) { 673 switch rsa.Addr.Family { 674 case AF_UNIX: 675 return nil, EWINDOWS 676 677 case AF_INET: 678 pp := (*RawSockaddrInet4)(unsafe.Pointer(rsa)) 679 sa := new(SockaddrInet4) 680 p := (*[2]byte)(unsafe.Pointer(&pp.Port)) 681 sa.Port = int(p[0])<<8 + int(p[1]) 682 for i := 0; i < len(sa.Addr); i++ { 683 sa.Addr[i] = pp.Addr[i] 684 } 685 return sa, nil 686 687 case AF_INET6: 688 pp := (*RawSockaddrInet6)(unsafe.Pointer(rsa)) 689 sa := new(SockaddrInet6) 690 p := (*[2]byte)(unsafe.Pointer(&pp.Port)) 691 sa.Port = int(p[0])<<8 + int(p[1]) 692 sa.ZoneId = pp.Scope_id 693 for i := 0; i < len(sa.Addr); i++ { 694 sa.Addr[i] = pp.Addr[i] 695 } 696 return sa, nil 697 } 698 return nil, EAFNOSUPPORT 699 } 700 701 func Socket(domain, typ, proto int) (fd Handle, err error) { 702 if domain == AF_INET6 && SocketDisableIPv6 { 703 return InvalidHandle, EAFNOSUPPORT 704 } 705 return socket(int32(domain), int32(typ), int32(proto)) 706 } 707 708 func SetsockoptInt(fd Handle, level, opt int, value int) (err error) { 709 v := int32(value) 710 return Setsockopt(fd, int32(level), int32(opt), (*byte)(unsafe.Pointer(&v)), int32(unsafe.Sizeof(v))) 711 } 712 713 func Bind(fd Handle, sa Sockaddr) (err error) { 714 ptr, n, err := sa.sockaddr() 715 if err != nil { 716 return err 717 } 718 return bind(fd, ptr, n) 719 } 720 721 func Connect(fd Handle, sa Sockaddr) (err error) { 722 ptr, n, err := sa.sockaddr() 723 if err != nil { 724 return err 725 } 726 return connect(fd, ptr, n) 727 } 728 729 func Getsockname(fd Handle) (sa Sockaddr, err error) { 730 var rsa RawSockaddrAny 731 l := int32(unsafe.Sizeof(rsa)) 732 if err = getsockname(fd, &rsa, &l); err != nil { 733 return 734 } 735 return rsa.Sockaddr() 736 } 737 738 func Getpeername(fd Handle) (sa Sockaddr, err error) { 739 var rsa RawSockaddrAny 740 l := int32(unsafe.Sizeof(rsa)) 741 if err = getpeername(fd, &rsa, &l); err != nil { 742 return 743 } 744 return rsa.Sockaddr() 745 } 746 747 func Listen(s Handle, n int) (err error) { 748 return listen(s, int32(n)) 749 } 750 751 func Shutdown(fd Handle, how int) (err error) { 752 return shutdown(fd, int32(how)) 753 } 754 755 func WSASendto(s Handle, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, to Sockaddr, overlapped *Overlapped, croutine *byte) (err error) { 756 rsa, l, err := to.sockaddr() 757 if err != nil { 758 return err 759 } 760 return WSASendTo(s, bufs, bufcnt, sent, flags, (*RawSockaddrAny)(unsafe.Pointer(rsa)), l, overlapped, croutine) 761 } 762 763 func LoadGetAddrInfo() error { 764 return procGetAddrInfoW.Find() 765 } 766 767 var connectExFunc struct { 768 once sync.Once 769 addr uintptr 770 err error 771 } 772 773 func LoadConnectEx() error { 774 connectExFunc.once.Do(func() { 775 var s Handle 776 s, connectExFunc.err = Socket(AF_INET, SOCK_STREAM, IPPROTO_TCP) 777 if connectExFunc.err != nil { 778 return 779 } 780 defer CloseHandle(s) 781 var n uint32 782 connectExFunc.err = WSAIoctl(s, 783 SIO_GET_EXTENSION_FUNCTION_POINTER, 784 (*byte)(unsafe.Pointer(&WSAID_CONNECTEX)), 785 uint32(unsafe.Sizeof(WSAID_CONNECTEX)), 786 (*byte)(unsafe.Pointer(&connectExFunc.addr)), 787 uint32(unsafe.Sizeof(connectExFunc.addr)), 788 &n, nil, 0) 789 }) 790 return connectExFunc.err 791 } 792 793 func connectEx(s Handle, name unsafe.Pointer, namelen int32, sendBuf *byte, sendDataLen uint32, bytesSent *uint32, overlapped *Overlapped) (err error) { 794 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) 795 if r1 == 0 { 796 if e1 != 0 { 797 err = error(e1) 798 } else { 799 err = EINVAL 800 } 801 } 802 return 803 } 804 805 func ConnectEx(fd Handle, sa Sockaddr, sendBuf *byte, sendDataLen uint32, bytesSent *uint32, overlapped *Overlapped) error { 806 err := LoadConnectEx() 807 if err != nil { 808 return errorspkg.New("failed to find ConnectEx: " + err.Error()) 809 } 810 ptr, n, err := sa.sockaddr() 811 if err != nil { 812 return err 813 } 814 return connectEx(fd, ptr, n, sendBuf, sendDataLen, bytesSent, overlapped) 815 } 816 817 // Invented structures to support what package os expects. 818 type Rusage struct { 819 CreationTime Filetime 820 ExitTime Filetime 821 KernelTime Filetime 822 UserTime Filetime 823 } 824 825 type WaitStatus struct { 826 ExitCode uint32 827 } 828 829 func (w WaitStatus) Exited() bool { return true } 830 831 func (w WaitStatus) ExitStatus() int { return int(w.ExitCode) } 832 833 func (w WaitStatus) Signal() Signal { return -1 } 834 835 func (w WaitStatus) CoreDump() bool { return false } 836 837 func (w WaitStatus) Stopped() bool { return false } 838 839 func (w WaitStatus) Continued() bool { return false } 840 841 func (w WaitStatus) StopSignal() Signal { return -1 } 842 843 func (w WaitStatus) Signaled() bool { return false } 844 845 func (w WaitStatus) TrapCause() int { return -1 } 846 847 // Timespec is an invented structure on Windows, but here for 848 // consistency with the syscall package for other operating systems. 849 type Timespec struct { 850 Sec int64 851 Nsec int64 852 } 853 854 func TimespecToNsec(ts Timespec) int64 { return int64(ts.Sec)*1e9 + int64(ts.Nsec) } 855 856 func NsecToTimespec(nsec int64) (ts Timespec) { 857 ts.Sec = nsec / 1e9 858 ts.Nsec = nsec % 1e9 859 return 860 } 861 862 // TODO(brainman): fix all needed for net 863 864 func Accept(fd Handle) (nfd Handle, sa Sockaddr, err error) { return 0, nil, EWINDOWS } 865 func Recvfrom(fd Handle, p []byte, flags int) (n int, from Sockaddr, err error) { 866 return 0, nil, EWINDOWS 867 } 868 func Sendto(fd Handle, p []byte, flags int, to Sockaddr) (err error) { return EWINDOWS } 869 func SetsockoptTimeval(fd Handle, level, opt int, tv *Timeval) (err error) { return EWINDOWS } 870 871 // The Linger struct is wrong but we only noticed after Go 1. 872 // sysLinger is the real system call structure. 873 874 // BUG(brainman): The definition of Linger is not appropriate for direct use 875 // with Setsockopt and Getsockopt. 876 // Use SetsockoptLinger instead. 877 878 type Linger struct { 879 Onoff int32 880 Linger int32 881 } 882 883 type sysLinger struct { 884 Onoff uint16 885 Linger uint16 886 } 887 888 type IPMreq struct { 889 Multiaddr [4]byte /* in_addr */ 890 Interface [4]byte /* in_addr */ 891 } 892 893 type IPv6Mreq struct { 894 Multiaddr [16]byte /* in6_addr */ 895 Interface uint32 896 } 897 898 func GetsockoptInt(fd Handle, level, opt int) (int, error) { return -1, EWINDOWS } 899 900 func SetsockoptLinger(fd Handle, level, opt int, l *Linger) (err error) { 901 sys := sysLinger{Onoff: uint16(l.Onoff), Linger: uint16(l.Linger)} 902 return Setsockopt(fd, int32(level), int32(opt), (*byte)(unsafe.Pointer(&sys)), int32(unsafe.Sizeof(sys))) 903 } 904 905 func SetsockoptInet4Addr(fd Handle, level, opt int, value [4]byte) (err error) { 906 return Setsockopt(fd, int32(level), int32(opt), (*byte)(unsafe.Pointer(&value[0])), 4) 907 } 908 func SetsockoptIPMreq(fd Handle, level, opt int, mreq *IPMreq) (err error) { 909 return Setsockopt(fd, int32(level), int32(opt), (*byte)(unsafe.Pointer(mreq)), int32(unsafe.Sizeof(*mreq))) 910 } 911 func SetsockoptIPv6Mreq(fd Handle, level, opt int, mreq *IPv6Mreq) (err error) { return EWINDOWS } 912 913 func Getpid() (pid int) { return int(getCurrentProcessId()) } 914 915 func FindFirstFile(name *uint16, data *Win32finddata) (handle Handle, err error) { 916 // NOTE(rsc): The Win32finddata struct is wrong for the system call: 917 // the two paths are each one uint16 short. Use the correct struct, 918 // a win32finddata1, and then copy the results out. 919 // There is no loss of expressivity here, because the final 920 // uint16, if it is used, is supposed to be a NUL, and Go doesn't need that. 921 // For Go 1.1, we might avoid the allocation of win32finddata1 here 922 // by adding a final Bug [2]uint16 field to the struct and then 923 // adjusting the fields in the result directly. 924 var data1 win32finddata1 925 handle, err = findFirstFile1(name, &data1) 926 if err == nil { 927 copyFindData(data, &data1) 928 } 929 return 930 } 931 932 func FindNextFile(handle Handle, data *Win32finddata) (err error) { 933 var data1 win32finddata1 934 err = findNextFile1(handle, &data1) 935 if err == nil { 936 copyFindData(data, &data1) 937 } 938 return 939 } 940 941 func getProcessEntry(pid int) (*ProcessEntry32, error) { 942 snapshot, err := CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0) 943 if err != nil { 944 return nil, err 945 } 946 defer CloseHandle(snapshot) 947 var procEntry ProcessEntry32 948 procEntry.Size = uint32(unsafe.Sizeof(procEntry)) 949 if err = Process32First(snapshot, &procEntry); err != nil { 950 return nil, err 951 } 952 for { 953 if procEntry.ProcessID == uint32(pid) { 954 return &procEntry, nil 955 } 956 err = Process32Next(snapshot, &procEntry) 957 if err != nil { 958 return nil, err 959 } 960 } 961 } 962 963 func Getppid() (ppid int) { 964 pe, err := getProcessEntry(Getpid()) 965 if err != nil { 966 return -1 967 } 968 return int(pe.ParentProcessID) 969 } 970 971 // TODO(brainman): fix all needed for os 972 func Fchdir(fd Handle) (err error) { return EWINDOWS } 973 func Link(oldpath, newpath string) (err error) { return EWINDOWS } 974 func Symlink(path, link string) (err error) { return EWINDOWS } 975 976 func Fchmod(fd Handle, mode uint32) (err error) { return EWINDOWS } 977 func Chown(path string, uid int, gid int) (err error) { return EWINDOWS } 978 func Lchown(path string, uid int, gid int) (err error) { return EWINDOWS } 979 func Fchown(fd Handle, uid int, gid int) (err error) { return EWINDOWS } 980 981 func Getuid() (uid int) { return -1 } 982 func Geteuid() (euid int) { return -1 } 983 func Getgid() (gid int) { return -1 } 984 func Getegid() (egid int) { return -1 } 985 func Getgroups() (gids []int, err error) { return nil, EWINDOWS } 986 987 type Signal int 988 989 func (s Signal) Signal() {} 990 991 func (s Signal) String() string { 992 if 0 <= s && int(s) < len(signals) { 993 str := signals[s] 994 if str != "" { 995 return str 996 } 997 } 998 return "signal " + itoa(int(s)) 999 } 1000 1001 func LoadCreateSymbolicLink() error { 1002 return procCreateSymbolicLinkW.Find() 1003 } 1004 1005 // Readlink returns the destination of the named symbolic link. 1006 func Readlink(path string, buf []byte) (n int, err error) { 1007 fd, err := CreateFile(StringToUTF16Ptr(path), GENERIC_READ, 0, nil, OPEN_EXISTING, 1008 FILE_FLAG_OPEN_REPARSE_POINT|FILE_FLAG_BACKUP_SEMANTICS, 0) 1009 if err != nil { 1010 return -1, err 1011 } 1012 defer CloseHandle(fd) 1013 1014 rdbbuf := make([]byte, MAXIMUM_REPARSE_DATA_BUFFER_SIZE) 1015 var bytesReturned uint32 1016 err = DeviceIoControl(fd, FSCTL_GET_REPARSE_POINT, nil, 0, &rdbbuf[0], uint32(len(rdbbuf)), &bytesReturned, nil) 1017 if err != nil { 1018 return -1, err 1019 } 1020 1021 rdb := (*reparseDataBuffer)(unsafe.Pointer(&rdbbuf[0])) 1022 var s string 1023 switch rdb.ReparseTag { 1024 case IO_REPARSE_TAG_SYMLINK: 1025 data := (*symbolicLinkReparseBuffer)(unsafe.Pointer(&rdb.reparseBuffer)) 1026 p := (*[0xffff]uint16)(unsafe.Pointer(&data.PathBuffer[0])) 1027 s = UTF16ToString(p[data.SubstituteNameOffset/2 : (data.SubstituteNameOffset+data.SubstituteNameLength)/2]) 1028 if data.Flags&_SYMLINK_FLAG_RELATIVE == 0 { 1029 if len(s) >= 4 && s[:4] == `\??\` { 1030 s = s[4:] 1031 switch { 1032 case len(s) >= 2 && s[1] == ':': // \??\C:\foo\bar 1033 // do nothing 1034 case len(s) >= 4 && s[:4] == `UNC\`: // \??\UNC\foo\bar 1035 s = `\\` + s[4:] 1036 default: 1037 // unexpected; do nothing 1038 } 1039 } else { 1040 // unexpected; do nothing 1041 } 1042 } 1043 case _IO_REPARSE_TAG_MOUNT_POINT: 1044 data := (*mountPointReparseBuffer)(unsafe.Pointer(&rdb.reparseBuffer)) 1045 p := (*[0xffff]uint16)(unsafe.Pointer(&data.PathBuffer[0])) 1046 s = UTF16ToString(p[data.SubstituteNameOffset/2 : (data.SubstituteNameOffset+data.SubstituteNameLength)/2]) 1047 if len(s) >= 4 && s[:4] == `\??\` { // \??\C:\foo\bar 1048 s = s[4:] 1049 } else { 1050 // unexpected; do nothing 1051 } 1052 default: 1053 // the path is not a symlink or junction but another type of reparse 1054 // point 1055 return -1, ENOENT 1056 } 1057 n = copy(buf, []byte(s)) 1058 1059 return n, nil 1060 } 1061
