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 CreateProcessAsUser(token Token, appName *uint16, commandLine *uint16, procSecurity *SecurityAttributes, threadSecurity *SecurityAttributes, inheritHandles bool, creationFlags uint32, env *uint16, currentDir *uint16, startupInfo *StartupInfo, outProcInfo *ProcessInformation) (err error) = advapi32.CreateProcessAsUserW 173 //sys OpenProcess(da uint32, inheritHandle bool, pid uint32) (handle Handle, err error) 174 //sys TerminateProcess(handle Handle, exitcode uint32) (err error) 175 //sys GetExitCodeProcess(handle Handle, exitcode *uint32) (err error) 176 //sys GetStartupInfo(startupInfo *StartupInfo) (err error) = GetStartupInfoW 177 //sys GetCurrentProcess() (pseudoHandle Handle, err error) 178 //sys GetProcessTimes(handle Handle, creationTime *Filetime, exitTime *Filetime, kernelTime *Filetime, userTime *Filetime) (err error) 179 //sys DuplicateHandle(hSourceProcessHandle Handle, hSourceHandle Handle, hTargetProcessHandle Handle, lpTargetHandle *Handle, dwDesiredAccess uint32, bInheritHandle bool, dwOptions uint32) (err error) 180 //sys WaitForSingleObject(handle Handle, waitMilliseconds uint32) (event uint32, err error) [failretval==0xffffffff] 181 //sys GetTempPath(buflen uint32, buf *uint16) (n uint32, err error) = GetTempPathW 182 //sys CreatePipe(readhandle *Handle, writehandle *Handle, sa *SecurityAttributes, size uint32) (err error) 183 //sys GetFileType(filehandle Handle) (n uint32, err error) 184 //sys CryptAcquireContext(provhandle *Handle, container *uint16, provider *uint16, provtype uint32, flags uint32) (err error) = advapi32.CryptAcquireContextW 185 //sys CryptReleaseContext(provhandle Handle, flags uint32) (err error) = advapi32.CryptReleaseContext 186 //sys CryptGenRandom(provhandle Handle, buflen uint32, buf *byte) (err error) = advapi32.CryptGenRandom 187 //sys GetEnvironmentStrings() (envs *uint16, err error) [failretval==nil] = kernel32.GetEnvironmentStringsW 188 //sys FreeEnvironmentStrings(envs *uint16) (err error) = kernel32.FreeEnvironmentStringsW 189 //sys GetEnvironmentVariable(name *uint16, buffer *uint16, size uint32) (n uint32, err error) = kernel32.GetEnvironmentVariableW 190 //sys SetEnvironmentVariable(name *uint16, value *uint16) (err error) = kernel32.SetEnvironmentVariableW 191 //sys SetFileTime(handle Handle, ctime *Filetime, atime *Filetime, wtime *Filetime) (err error) 192 //sys GetFileAttributes(name *uint16) (attrs uint32, err error) [failretval==INVALID_FILE_ATTRIBUTES] = kernel32.GetFileAttributesW 193 //sys SetFileAttributes(name *uint16, attrs uint32) (err error) = kernel32.SetFileAttributesW 194 //sys GetFileAttributesEx(name *uint16, level uint32, info *byte) (err error) = kernel32.GetFileAttributesExW 195 //sys GetCommandLine() (cmd *uint16) = kernel32.GetCommandLineW 196 //sys CommandLineToArgv(cmd *uint16, argc *int32) (argv *[8192]*[8192]uint16, err error) [failretval==nil] = shell32.CommandLineToArgvW 197 //sys LocalFree(hmem Handle) (handle Handle, err error) [failretval!=0] 198 //sys SetHandleInformation(handle Handle, mask uint32, flags uint32) (err error) 199 //sys FlushFileBuffers(handle Handle) (err error) 200 //sys GetFullPathName(path *uint16, buflen uint32, buf *uint16, fname **uint16) (n uint32, err error) = kernel32.GetFullPathNameW 201 //sys GetLongPathName(path *uint16, buf *uint16, buflen uint32) (n uint32, err error) = kernel32.GetLongPathNameW 202 //sys GetShortPathName(longpath *uint16, shortpath *uint16, buflen uint32) (n uint32, err error) = kernel32.GetShortPathNameW 203 //sys CreateFileMapping(fhandle Handle, sa *SecurityAttributes, prot uint32, maxSizeHigh uint32, maxSizeLow uint32, name *uint16) (handle Handle, err error) = kernel32.CreateFileMappingW 204 //sys MapViewOfFile(handle Handle, access uint32, offsetHigh uint32, offsetLow uint32, length uintptr) (addr uintptr, err error) 205 //sys UnmapViewOfFile(addr uintptr) (err error) 206 //sys FlushViewOfFile(addr uintptr, length uintptr) (err error) 207 //sys VirtualLock(addr uintptr, length uintptr) (err error) 208 //sys VirtualUnlock(addr uintptr, length uintptr) (err error) 209 //sys TransmitFile(s Handle, handle Handle, bytesToWrite uint32, bytsPerSend uint32, overlapped *Overlapped, transmitFileBuf *TransmitFileBuffers, flags uint32) (err error) = mswsock.TransmitFile 210 //sys ReadDirectoryChanges(handle Handle, buf *byte, buflen uint32, watchSubTree bool, mask uint32, retlen *uint32, overlapped *Overlapped, completionRoutine uintptr) (err error) = kernel32.ReadDirectoryChangesW 211 //sys CertOpenSystemStore(hprov Handle, name *uint16) (store Handle, err error) = crypt32.CertOpenSystemStoreW 212 //sys CertOpenStore(storeProvider uintptr, msgAndCertEncodingType uint32, cryptProv uintptr, flags uint32, para uintptr) (handle Handle, err error) [failretval==InvalidHandle] = crypt32.CertOpenStore 213 //sys CertEnumCertificatesInStore(store Handle, prevContext *CertContext) (context *CertContext, err error) [failretval==nil] = crypt32.CertEnumCertificatesInStore 214 //sys CertAddCertificateContextToStore(store Handle, certContext *CertContext, addDisposition uint32, storeContext **CertContext) (err error) = crypt32.CertAddCertificateContextToStore 215 //sys CertCloseStore(store Handle, flags uint32) (err error) = crypt32.CertCloseStore 216 //sys CertGetCertificateChain(engine Handle, leaf *CertContext, time *Filetime, additionalStore Handle, para *CertChainPara, flags uint32, reserved uintptr, chainCtx **CertChainContext) (err error) = crypt32.CertGetCertificateChain 217 //sys CertFreeCertificateChain(ctx *CertChainContext) = crypt32.CertFreeCertificateChain 218 //sys CertCreateCertificateContext(certEncodingType uint32, certEncoded *byte, encodedLen uint32) (context *CertContext, err error) [failretval==nil] = crypt32.CertCreateCertificateContext 219 //sys CertFreeCertificateContext(ctx *CertContext) (err error) = crypt32.CertFreeCertificateContext 220 //sys CertVerifyCertificateChainPolicy(policyOID uintptr, chain *CertChainContext, para *CertChainPolicyPara, status *CertChainPolicyStatus) (err error) = crypt32.CertVerifyCertificateChainPolicy 221 //sys RegOpenKeyEx(key Handle, subkey *uint16, options uint32, desiredAccess uint32, result *Handle) (regerrno error) = advapi32.RegOpenKeyExW 222 //sys RegCloseKey(key Handle) (regerrno error) = advapi32.RegCloseKey 223 //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 224 //sys RegEnumKeyEx(key Handle, index uint32, name *uint16, nameLen *uint32, reserved *uint32, class *uint16, classLen *uint32, lastWriteTime *Filetime) (regerrno error) = advapi32.RegEnumKeyExW 225 //sys RegQueryValueEx(key Handle, name *uint16, reserved *uint32, valtype *uint32, buf *byte, buflen *uint32) (regerrno error) = advapi32.RegQueryValueExW 226 //sys getCurrentProcessId() (pid uint32) = kernel32.GetCurrentProcessId 227 //sys GetConsoleMode(console Handle, mode *uint32) (err error) = kernel32.GetConsoleMode 228 //sys WriteConsole(console Handle, buf *uint16, towrite uint32, written *uint32, reserved *byte) (err error) = kernel32.WriteConsoleW 229 //sys ReadConsole(console Handle, buf *uint16, toread uint32, read *uint32, inputControl *byte) (err error) = kernel32.ReadConsoleW 230 //sys CreateToolhelp32Snapshot(flags uint32, processId uint32) (handle Handle, err error) [failretval==InvalidHandle] = kernel32.CreateToolhelp32Snapshot 231 //sys Process32First(snapshot Handle, procEntry *ProcessEntry32) (err error) = kernel32.Process32FirstW 232 //sys Process32Next(snapshot Handle, procEntry *ProcessEntry32) (err error) = kernel32.Process32NextW 233 //sys DeviceIoControl(handle Handle, ioControlCode uint32, inBuffer *byte, inBufferSize uint32, outBuffer *byte, outBufferSize uint32, bytesReturned *uint32, overlapped *Overlapped) (err error) 234 // This function returns 1 byte BOOLEAN rather than the 4 byte BOOL. 235 //sys CreateSymbolicLink(symlinkfilename *uint16, targetfilename *uint16, flags uint32) (err error) [failretval&0xff==0] = CreateSymbolicLinkW 236 //sys CreateHardLink(filename *uint16, existingfilename *uint16, reserved uintptr) (err error) [failretval&0xff==0] = CreateHardLinkW 237 238 // syscall interface implementation for other packages 239 240 func makeInheritSa() *SecurityAttributes { 241 var sa SecurityAttributes 242 sa.Length = uint32(unsafe.Sizeof(sa)) 243 sa.InheritHandle = 1 244 return &sa 245 } 246 247 func Open(path string, mode int, perm uint32) (fd Handle, err error) { 248 if len(path) == 0 { 249 return InvalidHandle, ERROR_FILE_NOT_FOUND 250 } 251 pathp, err := UTF16PtrFromString(path) 252 if err != nil { 253 return InvalidHandle, err 254 } 255 var access uint32 256 switch mode & (O_RDONLY | O_WRONLY | O_RDWR) { 257 case O_RDONLY: 258 access = GENERIC_READ 259 case O_WRONLY: 260 access = GENERIC_WRITE 261 case O_RDWR: 262 access = GENERIC_READ | GENERIC_WRITE 263 } 264 if mode&O_CREAT != 0 { 265 access |= GENERIC_WRITE 266 } 267 if mode&O_APPEND != 0 { 268 access &^= GENERIC_WRITE 269 access |= FILE_APPEND_DATA 270 } 271 sharemode := uint32(FILE_SHARE_READ | FILE_SHARE_WRITE) 272 var sa *SecurityAttributes 273 if mode&O_CLOEXEC == 0 { 274 sa = makeInheritSa() 275 } 276 var createmode uint32 277 switch { 278 case mode&(O_CREAT|O_EXCL) == (O_CREAT | O_EXCL): 279 createmode = CREATE_NEW 280 case mode&(O_CREAT|O_TRUNC) == (O_CREAT | O_TRUNC): 281 createmode = CREATE_ALWAYS 282 case mode&O_CREAT == O_CREAT: 283 createmode = OPEN_ALWAYS 284 case mode&O_TRUNC == O_TRUNC: 285 createmode = TRUNCATE_EXISTING 286 default: 287 createmode = OPEN_EXISTING 288 } 289 h, e := CreateFile(pathp, access, sharemode, sa, createmode, FILE_ATTRIBUTE_NORMAL, 0) 290 return h, e 291 } 292 293 func Read(fd Handle, p []byte) (n int, err error) { 294 var done uint32 295 e := ReadFile(fd, p, &done, nil) 296 if e != nil { 297 if e == ERROR_BROKEN_PIPE { 298 // NOTE(brainman): work around ERROR_BROKEN_PIPE is returned on reading EOF from stdin 299 return 0, nil 300 } 301 return 0, e 302 } 303 if race.Enabled { 304 if done > 0 { 305 race.WriteRange(unsafe.Pointer(&p[0]), int(done)) 306 } 307 race.Acquire(unsafe.Pointer(&ioSync)) 308 } 309 if msanenabled && done > 0 { 310 msanWrite(unsafe.Pointer(&p[0]), int(done)) 311 } 312 return int(done), nil 313 } 314 315 func Write(fd Handle, p []byte) (n int, err error) { 316 if race.Enabled { 317 race.ReleaseMerge(unsafe.Pointer(&ioSync)) 318 } 319 var done uint32 320 e := WriteFile(fd, p, &done, nil) 321 if e != nil { 322 return 0, e 323 } 324 if race.Enabled && done > 0 { 325 race.ReadRange(unsafe.Pointer(&p[0]), int(done)) 326 } 327 if msanenabled && done > 0 { 328 msanRead(unsafe.Pointer(&p[0]), int(done)) 329 } 330 return int(done), nil 331 } 332 333 var ioSync int64 334 335 var procSetFilePointerEx = modkernel32.NewProc("SetFilePointerEx") 336 337 const ptrSize = unsafe.Sizeof(uintptr(0)) 338 339 // setFilePointerEx calls SetFilePointerEx. 340 // See https://msdn.microsoft.com/en-us/library/windows/desktop/aa365542(v=vs.85).aspx 341 func setFilePointerEx(handle Handle, distToMove int64, newFilePointer *int64, whence uint32) error { 342 var e1 Errno 343 if ptrSize == 8 { 344 _, _, e1 = Syscall6(procSetFilePointerEx.Addr(), 4, uintptr(handle), uintptr(distToMove), uintptr(unsafe.Pointer(newFilePointer)), uintptr(whence), 0, 0) 345 } else { 346 // distToMove is a LARGE_INTEGER: 347 // https://msdn.microsoft.com/en-us/library/windows/desktop/aa383713(v=vs.85).aspx 348 _, _, e1 = Syscall6(procSetFilePointerEx.Addr(), 5, uintptr(handle), uintptr(distToMove), uintptr(distToMove>>32), uintptr(unsafe.Pointer(newFilePointer)), uintptr(whence), 0) 349 } 350 if e1 != 0 { 351 return errnoErr(e1) 352 } 353 return nil 354 } 355 356 func Seek(fd Handle, offset int64, whence int) (newoffset int64, err error) { 357 var w uint32 358 switch whence { 359 case 0: 360 w = FILE_BEGIN 361 case 1: 362 w = FILE_CURRENT 363 case 2: 364 w = FILE_END 365 } 366 // use GetFileType to check pipe, pipe can't do seek 367 ft, _ := GetFileType(fd) 368 if ft == FILE_TYPE_PIPE { 369 return 0, ESPIPE 370 } 371 err = setFilePointerEx(fd, offset, &newoffset, w) 372 return 373 } 374 375 func Close(fd Handle) (err error) { 376 return CloseHandle(fd) 377 } 378 379 var ( 380 Stdin = getStdHandle(STD_INPUT_HANDLE) 381 Stdout = getStdHandle(STD_OUTPUT_HANDLE) 382 Stderr = getStdHandle(STD_ERROR_HANDLE) 383 ) 384 385 func getStdHandle(h int) (fd Handle) { 386 r, _ := GetStdHandle(h) 387 CloseOnExec(r) 388 return r 389 } 390 391 const ImplementsGetwd = true 392 393 func Getwd() (wd string, err error) { 394 b := make([]uint16, 300) 395 n, e := GetCurrentDirectory(uint32(len(b)), &b[0]) 396 if e != nil { 397 return "", e 398 } 399 return string(utf16.Decode(b[0:n])), nil 400 } 401 402 func Chdir(path string) (err error) { 403 pathp, err := UTF16PtrFromString(path) 404 if err != nil { 405 return err 406 } 407 return SetCurrentDirectory(pathp) 408 } 409 410 func Mkdir(path string, mode uint32) (err error) { 411 pathp, err := UTF16PtrFromString(path) 412 if err != nil { 413 return err 414 } 415 return CreateDirectory(pathp, nil) 416 } 417 418 func Rmdir(path string) (err error) { 419 pathp, err := UTF16PtrFromString(path) 420 if err != nil { 421 return err 422 } 423 return RemoveDirectory(pathp) 424 } 425 426 func Unlink(path string) (err error) { 427 pathp, err := UTF16PtrFromString(path) 428 if err != nil { 429 return err 430 } 431 return DeleteFile(pathp) 432 } 433 434 func Rename(oldpath, newpath string) (err error) { 435 from, err := UTF16PtrFromString(oldpath) 436 if err != nil { 437 return err 438 } 439 to, err := UTF16PtrFromString(newpath) 440 if err != nil { 441 return err 442 } 443 return MoveFile(from, to) 444 } 445 446 func ComputerName() (name string, err error) { 447 var n uint32 = MAX_COMPUTERNAME_LENGTH + 1 448 b := make([]uint16, n) 449 e := GetComputerName(&b[0], &n) 450 if e != nil { 451 return "", e 452 } 453 return string(utf16.Decode(b[0:n])), nil 454 } 455 456 func Ftruncate(fd Handle, length int64) (err error) { 457 curoffset, e := Seek(fd, 0, 1) 458 if e != nil { 459 return e 460 } 461 defer Seek(fd, curoffset, 0) 462 _, e = Seek(fd, length, 0) 463 if e != nil { 464 return e 465 } 466 e = SetEndOfFile(fd) 467 if e != nil { 468 return e 469 } 470 return nil 471 } 472 473 func Gettimeofday(tv *Timeval) (err error) { 474 var ft Filetime 475 GetSystemTimeAsFileTime(&ft) 476 *tv = NsecToTimeval(ft.Nanoseconds()) 477 return nil 478 } 479 480 func Pipe(p []Handle) (err error) { 481 if len(p) != 2 { 482 return EINVAL 483 } 484 var r, w Handle 485 e := CreatePipe(&r, &w, makeInheritSa(), 0) 486 if e != nil { 487 return e 488 } 489 p[0] = r 490 p[1] = w 491 return nil 492 } 493 494 func Utimes(path string, tv []Timeval) (err error) { 495 if len(tv) != 2 { 496 return EINVAL 497 } 498 pathp, e := UTF16PtrFromString(path) 499 if e != nil { 500 return e 501 } 502 h, e := CreateFile(pathp, 503 FILE_WRITE_ATTRIBUTES, FILE_SHARE_WRITE, nil, 504 OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0) 505 if e != nil { 506 return e 507 } 508 defer Close(h) 509 a := NsecToFiletime(tv[0].Nanoseconds()) 510 w := NsecToFiletime(tv[1].Nanoseconds()) 511 return SetFileTime(h, nil, &a, &w) 512 } 513 514 func UtimesNano(path string, ts []Timespec) (err error) { 515 if len(ts) != 2 { 516 return EINVAL 517 } 518 pathp, e := UTF16PtrFromString(path) 519 if e != nil { 520 return e 521 } 522 h, e := CreateFile(pathp, 523 FILE_WRITE_ATTRIBUTES, FILE_SHARE_WRITE, nil, 524 OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0) 525 if e != nil { 526 return e 527 } 528 defer Close(h) 529 a := NsecToFiletime(TimespecToNsec(ts[0])) 530 w := NsecToFiletime(TimespecToNsec(ts[1])) 531 return SetFileTime(h, nil, &a, &w) 532 } 533 534 func Fsync(fd Handle) (err error) { 535 return FlushFileBuffers(fd) 536 } 537 538 func Chmod(path string, mode uint32) (err error) { 539 if mode == 0 { 540 return EINVAL 541 } 542 p, e := UTF16PtrFromString(path) 543 if e != nil { 544 return e 545 } 546 attrs, e := GetFileAttributes(p) 547 if e != nil { 548 return e 549 } 550 if mode&S_IWRITE != 0 { 551 attrs &^= FILE_ATTRIBUTE_READONLY 552 } else { 553 attrs |= FILE_ATTRIBUTE_READONLY 554 } 555 return SetFileAttributes(p, attrs) 556 } 557 558 func LoadCancelIoEx() error { 559 return procCancelIoEx.Find() 560 } 561 562 func LoadSetFileCompletionNotificationModes() error { 563 return procSetFileCompletionNotificationModes.Find() 564 } 565 566 // net api calls 567 568 const socket_error = uintptr(^uint32(0)) 569 570 //sys WSAStartup(verreq uint32, data *WSAData) (sockerr error) = ws2_32.WSAStartup 571 //sys WSACleanup() (err error) [failretval==socket_error] = ws2_32.WSACleanup 572 //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 573 //sys socket(af int32, typ int32, protocol int32) (handle Handle, err error) [failretval==InvalidHandle] = ws2_32.socket 574 //sys Setsockopt(s Handle, level int32, optname int32, optval *byte, optlen int32) (err error) [failretval==socket_error] = ws2_32.setsockopt 575 //sys Getsockopt(s Handle, level int32, optname int32, optval *byte, optlen *int32) (err error) [failretval==socket_error] = ws2_32.getsockopt 576 //sys bind(s Handle, name unsafe.Pointer, namelen int32) (err error) [failretval==socket_error] = ws2_32.bind 577 //sys connect(s Handle, name unsafe.Pointer, namelen int32) (err error) [failretval==socket_error] = ws2_32.connect 578 //sys getsockname(s Handle, rsa *RawSockaddrAny, addrlen *int32) (err error) [failretval==socket_error] = ws2_32.getsockname 579 //sys getpeername(s Handle, rsa *RawSockaddrAny, addrlen *int32) (err error) [failretval==socket_error] = ws2_32.getpeername 580 //sys listen(s Handle, backlog int32) (err error) [failretval==socket_error] = ws2_32.listen 581 //sys shutdown(s Handle, how int32) (err error) [failretval==socket_error] = ws2_32.shutdown 582 //sys Closesocket(s Handle) (err error) [failretval==socket_error] = ws2_32.closesocket 583 //sys AcceptEx(ls Handle, as Handle, buf *byte, rxdatalen uint32, laddrlen uint32, raddrlen uint32, recvd *uint32, overlapped *Overlapped) (err error) = mswsock.AcceptEx 584 //sys GetAcceptExSockaddrs(buf *byte, rxdatalen uint32, laddrlen uint32, raddrlen uint32, lrsa **RawSockaddrAny, lrsalen *int32, rrsa **RawSockaddrAny, rrsalen *int32) = mswsock.GetAcceptExSockaddrs 585 //sys WSARecv(s Handle, bufs *WSABuf, bufcnt uint32, recvd *uint32, flags *uint32, overlapped *Overlapped, croutine *byte) (err error) [failretval==socket_error] = ws2_32.WSARecv 586 //sys WSASend(s Handle, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, overlapped *Overlapped, croutine *byte) (err error) [failretval==socket_error] = ws2_32.WSASend 587 //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 588 //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 589 //sys GetHostByName(name string) (h *Hostent, err error) [failretval==nil] = ws2_32.gethostbyname 590 //sys GetServByName(name string, proto string) (s *Servent, err error) [failretval==nil] = ws2_32.getservbyname 591 //sys Ntohs(netshort uint16) (u uint16) = ws2_32.ntohs 592 //sys GetProtoByName(name string) (p *Protoent, err error) [failretval==nil] = ws2_32.getprotobyname 593 //sys DnsQuery(name string, qtype uint16, options uint32, extra *byte, qrs **DNSRecord, pr *byte) (status error) = dnsapi.DnsQuery_W 594 //sys DnsRecordListFree(rl *DNSRecord, freetype uint32) = dnsapi.DnsRecordListFree 595 //sys DnsNameCompare(name1 *uint16, name2 *uint16) (same bool) = dnsapi.DnsNameCompare_W 596 //sys GetAddrInfoW(nodename *uint16, servicename *uint16, hints *AddrinfoW, result **AddrinfoW) (sockerr error) = ws2_32.GetAddrInfoW 597 //sys FreeAddrInfoW(addrinfo *AddrinfoW) = ws2_32.FreeAddrInfoW 598 //sys GetIfEntry(pIfRow *MibIfRow) (errcode error) = iphlpapi.GetIfEntry 599 //sys GetAdaptersInfo(ai *IpAdapterInfo, ol *uint32) (errcode error) = iphlpapi.GetAdaptersInfo 600 //sys SetFileCompletionNotificationModes(handle Handle, flags uint8) (err error) = kernel32.SetFileCompletionNotificationModes 601 //sys WSAEnumProtocols(protocols *int32, protocolBuffer *WSAProtocolInfo, bufferLength *uint32) (n int32, err error) [failretval==-1] = ws2_32.WSAEnumProtocolsW 602 603 // For testing: clients can set this flag to force 604 // creation of IPv6 sockets to return EAFNOSUPPORT. 605 var SocketDisableIPv6 bool 606 607 type RawSockaddrInet4 struct { 608 Family uint16 609 Port uint16 610 Addr [4]byte /* in_addr */ 611 Zero [8]uint8 612 } 613 614 type RawSockaddrInet6 struct { 615 Family uint16 616 Port uint16 617 Flowinfo uint32 618 Addr [16]byte /* in6_addr */ 619 Scope_id uint32 620 } 621 622 type RawSockaddr struct { 623 Family uint16 624 Data [14]int8 625 } 626 627 type RawSockaddrAny struct { 628 Addr RawSockaddr 629 Pad [96]int8 630 } 631 632 type Sockaddr interface { 633 sockaddr() (ptr unsafe.Pointer, len int32, err error) // lowercase; only we can define Sockaddrs 634 } 635 636 type SockaddrInet4 struct { 637 Port int 638 Addr [4]byte 639 raw RawSockaddrInet4 640 } 641 642 func (sa *SockaddrInet4) sockaddr() (unsafe.Pointer, int32, error) { 643 if sa.Port < 0 || sa.Port > 0xFFFF { 644 return nil, 0, EINVAL 645 } 646 sa.raw.Family = AF_INET 647 p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port)) 648 p[0] = byte(sa.Port >> 8) 649 p[1] = byte(sa.Port) 650 for i := 0; i < len(sa.Addr); i++ { 651 sa.raw.Addr[i] = sa.Addr[i] 652 } 653 return unsafe.Pointer(&sa.raw), int32(unsafe.Sizeof(sa.raw)), nil 654 } 655 656 type SockaddrInet6 struct { 657 Port int 658 ZoneId uint32 659 Addr [16]byte 660 raw RawSockaddrInet6 661 } 662 663 func (sa *SockaddrInet6) sockaddr() (unsafe.Pointer, int32, error) { 664 if sa.Port < 0 || sa.Port > 0xFFFF { 665 return nil, 0, EINVAL 666 } 667 sa.raw.Family = AF_INET6 668 p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port)) 669 p[0] = byte(sa.Port >> 8) 670 p[1] = byte(sa.Port) 671 sa.raw.Scope_id = sa.ZoneId 672 for i := 0; i < len(sa.Addr); i++ { 673 sa.raw.Addr[i] = sa.Addr[i] 674 } 675 return unsafe.Pointer(&sa.raw), int32(unsafe.Sizeof(sa.raw)), nil 676 } 677 678 type SockaddrUnix struct { 679 Name string 680 } 681 682 func (sa *SockaddrUnix) sockaddr() (unsafe.Pointer, int32, error) { 683 // TODO(brainman): implement SockaddrUnix.sockaddr() 684 return nil, 0, EWINDOWS 685 } 686 687 func (rsa *RawSockaddrAny) Sockaddr() (Sockaddr, error) { 688 switch rsa.Addr.Family { 689 case AF_UNIX: 690 return nil, EWINDOWS 691 692 case AF_INET: 693 pp := (*RawSockaddrInet4)(unsafe.Pointer(rsa)) 694 sa := new(SockaddrInet4) 695 p := (*[2]byte)(unsafe.Pointer(&pp.Port)) 696 sa.Port = int(p[0])<<8 + int(p[1]) 697 for i := 0; i < len(sa.Addr); i++ { 698 sa.Addr[i] = pp.Addr[i] 699 } 700 return sa, nil 701 702 case AF_INET6: 703 pp := (*RawSockaddrInet6)(unsafe.Pointer(rsa)) 704 sa := new(SockaddrInet6) 705 p := (*[2]byte)(unsafe.Pointer(&pp.Port)) 706 sa.Port = int(p[0])<<8 + int(p[1]) 707 sa.ZoneId = pp.Scope_id 708 for i := 0; i < len(sa.Addr); i++ { 709 sa.Addr[i] = pp.Addr[i] 710 } 711 return sa, nil 712 } 713 return nil, EAFNOSUPPORT 714 } 715 716 func Socket(domain, typ, proto int) (fd Handle, err error) { 717 if domain == AF_INET6 && SocketDisableIPv6 { 718 return InvalidHandle, EAFNOSUPPORT 719 } 720 return socket(int32(domain), int32(typ), int32(proto)) 721 } 722 723 func SetsockoptInt(fd Handle, level, opt int, value int) (err error) { 724 v := int32(value) 725 return Setsockopt(fd, int32(level), int32(opt), (*byte)(unsafe.Pointer(&v)), int32(unsafe.Sizeof(v))) 726 } 727 728 func Bind(fd Handle, sa Sockaddr) (err error) { 729 ptr, n, err := sa.sockaddr() 730 if err != nil { 731 return err 732 } 733 return bind(fd, ptr, n) 734 } 735 736 func Connect(fd Handle, sa Sockaddr) (err error) { 737 ptr, n, err := sa.sockaddr() 738 if err != nil { 739 return err 740 } 741 return connect(fd, ptr, n) 742 } 743 744 func Getsockname(fd Handle) (sa Sockaddr, err error) { 745 var rsa RawSockaddrAny 746 l := int32(unsafe.Sizeof(rsa)) 747 if err = getsockname(fd, &rsa, &l); err != nil { 748 return 749 } 750 return rsa.Sockaddr() 751 } 752 753 func Getpeername(fd Handle) (sa Sockaddr, err error) { 754 var rsa RawSockaddrAny 755 l := int32(unsafe.Sizeof(rsa)) 756 if err = getpeername(fd, &rsa, &l); err != nil { 757 return 758 } 759 return rsa.Sockaddr() 760 } 761 762 func Listen(s Handle, n int) (err error) { 763 return listen(s, int32(n)) 764 } 765 766 func Shutdown(fd Handle, how int) (err error) { 767 return shutdown(fd, int32(how)) 768 } 769 770 func WSASendto(s Handle, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, to Sockaddr, overlapped *Overlapped, croutine *byte) (err error) { 771 rsa, l, err := to.sockaddr() 772 if err != nil { 773 return err 774 } 775 return WSASendTo(s, bufs, bufcnt, sent, flags, (*RawSockaddrAny)(unsafe.Pointer(rsa)), l, overlapped, croutine) 776 } 777 778 func LoadGetAddrInfo() error { 779 return procGetAddrInfoW.Find() 780 } 781 782 var connectExFunc struct { 783 once sync.Once 784 addr uintptr 785 err error 786 } 787 788 func LoadConnectEx() error { 789 connectExFunc.once.Do(func() { 790 var s Handle 791 s, connectExFunc.err = Socket(AF_INET, SOCK_STREAM, IPPROTO_TCP) 792 if connectExFunc.err != nil { 793 return 794 } 795 defer CloseHandle(s) 796 var n uint32 797 connectExFunc.err = WSAIoctl(s, 798 SIO_GET_EXTENSION_FUNCTION_POINTER, 799 (*byte)(unsafe.Pointer(&WSAID_CONNECTEX)), 800 uint32(unsafe.Sizeof(WSAID_CONNECTEX)), 801 (*byte)(unsafe.Pointer(&connectExFunc.addr)), 802 uint32(unsafe.Sizeof(connectExFunc.addr)), 803 &n, nil, 0) 804 }) 805 return connectExFunc.err 806 } 807 808 func connectEx(s Handle, name unsafe.Pointer, namelen int32, sendBuf *byte, sendDataLen uint32, bytesSent *uint32, overlapped *Overlapped) (err error) { 809 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) 810 if r1 == 0 { 811 if e1 != 0 { 812 err = error(e1) 813 } else { 814 err = EINVAL 815 } 816 } 817 return 818 } 819 820 func ConnectEx(fd Handle, sa Sockaddr, sendBuf *byte, sendDataLen uint32, bytesSent *uint32, overlapped *Overlapped) error { 821 err := LoadConnectEx() 822 if err != nil { 823 return errorspkg.New("failed to find ConnectEx: " + err.Error()) 824 } 825 ptr, n, err := sa.sockaddr() 826 if err != nil { 827 return err 828 } 829 return connectEx(fd, ptr, n, sendBuf, sendDataLen, bytesSent, overlapped) 830 } 831 832 // Invented structures to support what package os expects. 833 type Rusage struct { 834 CreationTime Filetime 835 ExitTime Filetime 836 KernelTime Filetime 837 UserTime Filetime 838 } 839 840 type WaitStatus struct { 841 ExitCode uint32 842 } 843 844 func (w WaitStatus) Exited() bool { return true } 845 846 func (w WaitStatus) ExitStatus() int { return int(w.ExitCode) } 847 848 func (w WaitStatus) Signal() Signal { return -1 } 849 850 func (w WaitStatus) CoreDump() bool { return false } 851 852 func (w WaitStatus) Stopped() bool { return false } 853 854 func (w WaitStatus) Continued() bool { return false } 855 856 func (w WaitStatus) StopSignal() Signal { return -1 } 857 858 func (w WaitStatus) Signaled() bool { return false } 859 860 func (w WaitStatus) TrapCause() int { return -1 } 861 862 // Timespec is an invented structure on Windows, but here for 863 // consistency with the syscall package for other operating systems. 864 type Timespec struct { 865 Sec int64 866 Nsec int64 867 } 868 869 func TimespecToNsec(ts Timespec) int64 { return int64(ts.Sec)*1e9 + int64(ts.Nsec) } 870 871 func NsecToTimespec(nsec int64) (ts Timespec) { 872 ts.Sec = nsec / 1e9 873 ts.Nsec = nsec % 1e9 874 return 875 } 876 877 // TODO(brainman): fix all needed for net 878 879 func Accept(fd Handle) (nfd Handle, sa Sockaddr, err error) { return 0, nil, EWINDOWS } 880 func Recvfrom(fd Handle, p []byte, flags int) (n int, from Sockaddr, err error) { 881 return 0, nil, EWINDOWS 882 } 883 func Sendto(fd Handle, p []byte, flags int, to Sockaddr) (err error) { return EWINDOWS } 884 func SetsockoptTimeval(fd Handle, level, opt int, tv *Timeval) (err error) { return EWINDOWS } 885 886 // The Linger struct is wrong but we only noticed after Go 1. 887 // sysLinger is the real system call structure. 888 889 // BUG(brainman): The definition of Linger is not appropriate for direct use 890 // with Setsockopt and Getsockopt. 891 // Use SetsockoptLinger instead. 892 893 type Linger struct { 894 Onoff int32 895 Linger int32 896 } 897 898 type sysLinger struct { 899 Onoff uint16 900 Linger uint16 901 } 902 903 type IPMreq struct { 904 Multiaddr [4]byte /* in_addr */ 905 Interface [4]byte /* in_addr */ 906 } 907 908 type IPv6Mreq struct { 909 Multiaddr [16]byte /* in6_addr */ 910 Interface uint32 911 } 912 913 func GetsockoptInt(fd Handle, level, opt int) (int, error) { return -1, EWINDOWS } 914 915 func SetsockoptLinger(fd Handle, level, opt int, l *Linger) (err error) { 916 sys := sysLinger{Onoff: uint16(l.Onoff), Linger: uint16(l.Linger)} 917 return Setsockopt(fd, int32(level), int32(opt), (*byte)(unsafe.Pointer(&sys)), int32(unsafe.Sizeof(sys))) 918 } 919 920 func SetsockoptInet4Addr(fd Handle, level, opt int, value [4]byte) (err error) { 921 return Setsockopt(fd, int32(level), int32(opt), (*byte)(unsafe.Pointer(&value[0])), 4) 922 } 923 func SetsockoptIPMreq(fd Handle, level, opt int, mreq *IPMreq) (err error) { 924 return Setsockopt(fd, int32(level), int32(opt), (*byte)(unsafe.Pointer(mreq)), int32(unsafe.Sizeof(*mreq))) 925 } 926 func SetsockoptIPv6Mreq(fd Handle, level, opt int, mreq *IPv6Mreq) (err error) { return EWINDOWS } 927 928 func Getpid() (pid int) { return int(getCurrentProcessId()) } 929 930 func FindFirstFile(name *uint16, data *Win32finddata) (handle Handle, err error) { 931 // NOTE(rsc): The Win32finddata struct is wrong for the system call: 932 // the two paths are each one uint16 short. Use the correct struct, 933 // a win32finddata1, and then copy the results out. 934 // There is no loss of expressivity here, because the final 935 // uint16, if it is used, is supposed to be a NUL, and Go doesn't need that. 936 // For Go 1.1, we might avoid the allocation of win32finddata1 here 937 // by adding a final Bug [2]uint16 field to the struct and then 938 // adjusting the fields in the result directly. 939 var data1 win32finddata1 940 handle, err = findFirstFile1(name, &data1) 941 if err == nil { 942 copyFindData(data, &data1) 943 } 944 return 945 } 946 947 func FindNextFile(handle Handle, data *Win32finddata) (err error) { 948 var data1 win32finddata1 949 err = findNextFile1(handle, &data1) 950 if err == nil { 951 copyFindData(data, &data1) 952 } 953 return 954 } 955 956 func getProcessEntry(pid int) (*ProcessEntry32, error) { 957 snapshot, err := CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0) 958 if err != nil { 959 return nil, err 960 } 961 defer CloseHandle(snapshot) 962 var procEntry ProcessEntry32 963 procEntry.Size = uint32(unsafe.Sizeof(procEntry)) 964 if err = Process32First(snapshot, &procEntry); err != nil { 965 return nil, err 966 } 967 for { 968 if procEntry.ProcessID == uint32(pid) { 969 return &procEntry, nil 970 } 971 err = Process32Next(snapshot, &procEntry) 972 if err != nil { 973 return nil, err 974 } 975 } 976 } 977 978 func Getppid() (ppid int) { 979 pe, err := getProcessEntry(Getpid()) 980 if err != nil { 981 return -1 982 } 983 return int(pe.ParentProcessID) 984 } 985 986 // TODO(brainman): fix all needed for os 987 func Fchdir(fd Handle) (err error) { return EWINDOWS } 988 func Link(oldpath, newpath string) (err error) { return EWINDOWS } 989 func Symlink(path, link string) (err error) { return EWINDOWS } 990 991 func Fchmod(fd Handle, mode uint32) (err error) { return EWINDOWS } 992 func Chown(path string, uid int, gid int) (err error) { return EWINDOWS } 993 func Lchown(path string, uid int, gid int) (err error) { return EWINDOWS } 994 func Fchown(fd Handle, uid int, gid int) (err error) { return EWINDOWS } 995 996 func Getuid() (uid int) { return -1 } 997 func Geteuid() (euid int) { return -1 } 998 func Getgid() (gid int) { return -1 } 999 func Getegid() (egid int) { return -1 } 1000 func Getgroups() (gids []int, err error) { return nil, EWINDOWS } 1001 1002 type Signal int 1003 1004 func (s Signal) Signal() {} 1005 1006 func (s Signal) String() string { 1007 if 0 <= s && int(s) < len(signals) { 1008 str := signals[s] 1009 if str != "" { 1010 return str 1011 } 1012 } 1013 return "signal " + itoa(int(s)) 1014 } 1015 1016 func LoadCreateSymbolicLink() error { 1017 return procCreateSymbolicLinkW.Find() 1018 } 1019 1020 // Readlink returns the destination of the named symbolic link. 1021 func Readlink(path string, buf []byte) (n int, err error) { 1022 fd, err := CreateFile(StringToUTF16Ptr(path), GENERIC_READ, 0, nil, OPEN_EXISTING, 1023 FILE_FLAG_OPEN_REPARSE_POINT|FILE_FLAG_BACKUP_SEMANTICS, 0) 1024 if err != nil { 1025 return -1, err 1026 } 1027 defer CloseHandle(fd) 1028 1029 rdbbuf := make([]byte, MAXIMUM_REPARSE_DATA_BUFFER_SIZE) 1030 var bytesReturned uint32 1031 err = DeviceIoControl(fd, FSCTL_GET_REPARSE_POINT, nil, 0, &rdbbuf[0], uint32(len(rdbbuf)), &bytesReturned, nil) 1032 if err != nil { 1033 return -1, err 1034 } 1035 1036 rdb := (*reparseDataBuffer)(unsafe.Pointer(&rdbbuf[0])) 1037 var s string 1038 switch rdb.ReparseTag { 1039 case IO_REPARSE_TAG_SYMLINK: 1040 data := (*symbolicLinkReparseBuffer)(unsafe.Pointer(&rdb.reparseBuffer)) 1041 p := (*[0xffff]uint16)(unsafe.Pointer(&data.PathBuffer[0])) 1042 s = UTF16ToString(p[data.SubstituteNameOffset/2 : (data.SubstituteNameOffset+data.SubstituteNameLength)/2]) 1043 if data.Flags&_SYMLINK_FLAG_RELATIVE == 0 { 1044 if len(s) >= 4 && s[:4] == `\??\` { 1045 s = s[4:] 1046 switch { 1047 case len(s) >= 2 && s[1] == ':': // \??\C:\foo\bar 1048 // do nothing 1049 case len(s) >= 4 && s[:4] == `UNC\`: // \??\UNC\foo\bar 1050 s = `\\` + s[4:] 1051 default: 1052 // unexpected; do nothing 1053 } 1054 } else { 1055 // unexpected; do nothing 1056 } 1057 } 1058 case _IO_REPARSE_TAG_MOUNT_POINT: 1059 data := (*mountPointReparseBuffer)(unsafe.Pointer(&rdb.reparseBuffer)) 1060 p := (*[0xffff]uint16)(unsafe.Pointer(&data.PathBuffer[0])) 1061 s = UTF16ToString(p[data.SubstituteNameOffset/2 : (data.SubstituteNameOffset+data.SubstituteNameLength)/2]) 1062 if len(s) >= 4 && s[:4] == `\??\` { // \??\C:\foo\bar 1063 s = s[4:] 1064 } else { 1065 // unexpected; do nothing 1066 } 1067 default: 1068 // the path is not a symlink or junction but another type of reparse 1069 // point 1070 return -1, ENOENT 1071 } 1072 n = copy(buf, []byte(s)) 1073 1074 return n, nil 1075 } 1076
