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syscall_windows.go
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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Windows system calls.
package syscall
import (
errorspkg "errors"
"internal/asan"
"internal/bytealg"
"internal/itoa"
"internal/msan"
"internal/oserror"
"internal/race"
"runtime"
"sync"
"unsafe"
)
type Handle uintptr
const InvalidHandle = ^Handle(0)
// StringToUTF16 returns the UTF-16 encoding of the UTF-8 string s,
// with a terminating NUL added. If s contains a NUL byte this
// function panics instead of returning an error.
//
// Deprecated: Use [UTF16FromString] instead.
func StringToUTF16(s string) []uint16 {
a, err := UTF16FromString(s)
if err != nil {
panic("syscall: string with NUL passed to StringToUTF16")
}
return a
}
// UTF16FromString returns the UTF-16 encoding of the UTF-8 string
// s, with a terminating NUL added. If s contains a NUL byte at any
// location, it returns (nil, [EINVAL]). Unpaired surrogates
// are encoded using WTF-8.
func UTF16FromString(s string) ([]uint16, error) {
if bytealg.IndexByteString(s, 0) != -1 {
return nil, EINVAL
}
// Valid UTF-8 characters between 1 and 3 bytes require one uint16.
// Valid UTF-8 characters of 4 bytes require two uint16.
// Bytes with invalid UTF-8 encoding require maximum one uint16 per byte.
// So the number of UTF-8 code units (len(s)) is always greater or
// equal than the number of UTF-16 code units.
// Also account for the terminating NUL character.
buf := make([]uint16, 0, len(s)+1)
buf = encodeWTF16(s, buf)
return append(buf, 0), nil
}
// UTF16ToString returns the UTF-8 encoding of the UTF-16 sequence s,
// with a terminating NUL removed. Unpaired surrogates are decoded
// using WTF-8 instead of UTF-8 encoding.
func UTF16ToString(s []uint16) string {
maxLen := 0
for i, v := range s {
if v == 0 {
s = s[0:i]
break
}
switch {
case v <= rune1Max:
maxLen += 1
case v <= rune2Max:
maxLen += 2
default:
// r is a non-surrogate that decodes to 3 bytes,
// or is an unpaired surrogate (also 3 bytes in WTF-8),
// or is one half of a valid surrogate pair.
// If it is half of a pair, we will add 3 for the second surrogate
// (total of 6) and overestimate by 2 bytes for the pair,
// since the resulting rune only requires 4 bytes.
maxLen += 3
}
}
buf := decodeWTF16(s, make([]byte, 0, maxLen))
return unsafe.String(unsafe.SliceData(buf), len(buf))
}
// utf16PtrToString is like UTF16ToString, but takes *uint16
// as a parameter instead of []uint16.
func utf16PtrToString(p *uint16) string {
if p == nil {
return ""
}
end := unsafe.Pointer(p)
n := 0
for *(*uint16)(end) != 0 {
end = unsafe.Pointer(uintptr(end) + unsafe.Sizeof(*p))
n++
}
return UTF16ToString(unsafe.Slice(p, n))
}
// StringToUTF16Ptr returns pointer to the UTF-16 encoding of
// the UTF-8 string s, with a terminating NUL added. If s
// contains a NUL byte this function panics instead of
// returning an error.
//
// Deprecated: Use [UTF16PtrFromString] instead.
func StringToUTF16Ptr(s string) *uint16 { return &StringToUTF16(s)[0] }
// UTF16PtrFromString returns pointer to the UTF-16 encoding of
// the UTF-8 string s, with a terminating NUL added. If s
// contains a NUL byte at any location, it returns (nil, EINVAL).
// Unpaired surrogates are encoded using WTF-8.
func UTF16PtrFromString(s string) (*uint16, error) {
a, err := UTF16FromString(s)
if err != nil {
return nil, err
}
return &a[0], nil
}
// Errno is the Windows error number.
//
// Errno values can be tested against error values using [errors.Is].
// For example:
//
// _, _, err := syscall.Syscall(...)
// if errors.Is(err, fs.ErrNotExist) ...
type Errno uintptr
func langid(pri, sub uint16) uint32 { return uint32(sub)<<10 | uint32(pri) }
// FormatMessage is deprecated (msgsrc should be uintptr, not uint32, but can
// not be changed due to the Go 1 compatibility guarantee).
//
// Deprecated: Use FormatMessage from golang.org/x/sys/windows instead.
func FormatMessage(flags uint32, msgsrc uint32, msgid uint32, langid uint32, buf []uint16, args *byte) (n uint32, err error) {
return formatMessage(flags, uintptr(msgsrc), msgid, langid, buf, args)
}
func (e Errno) Error() string {
// deal with special go errors
idx := int(e - APPLICATION_ERROR)
if 0 <= idx && idx < len(errors) {
return errors[idx]
}
// ask windows for the remaining errors
var flags uint32 = FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ARGUMENT_ARRAY | FORMAT_MESSAGE_IGNORE_INSERTS
b := make([]uint16, 300)
n, err := formatMessage(flags, 0, uint32(e), langid(LANG_ENGLISH, SUBLANG_ENGLISH_US), b, nil)
if err != nil {
n, err = formatMessage(flags, 0, uint32(e), 0, b, nil)
if err != nil {
return "winapi error #" + itoa.Itoa(int(e))
}
}
// trim terminating \r and \n
for ; n > 0 && (b[n-1] == '\n' || b[n-1] == '\r'); n-- {
}
return UTF16ToString(b[:n])
}
const (
_ERROR_NOT_ENOUGH_MEMORY = Errno(8)
_ERROR_NOT_SUPPORTED = Errno(50)
_ERROR_BAD_NETPATH = Errno(53)
_ERROR_CALL_NOT_IMPLEMENTED = Errno(120)
)
func (e Errno) Is(target error) bool {
switch target {
case oserror.ErrPermission:
return e == ERROR_ACCESS_DENIED ||
e == EACCES ||
e == EPERM
case oserror.ErrExist:
return e == ERROR_ALREADY_EXISTS ||
e == ERROR_DIR_NOT_EMPTY ||
e == ERROR_FILE_EXISTS ||
e == EEXIST ||
e == ENOTEMPTY
case oserror.ErrNotExist:
return e == ERROR_FILE_NOT_FOUND ||
e == _ERROR_BAD_NETPATH ||
e == ERROR_PATH_NOT_FOUND ||
e == ENOENT
case errorspkg.ErrUnsupported:
return e == _ERROR_NOT_SUPPORTED ||
e == _ERROR_CALL_NOT_IMPLEMENTED ||
e == ENOSYS ||
e == ENOTSUP ||
e == EOPNOTSUPP ||
e == EWINDOWS
}
return false
}
func (e Errno) Temporary() bool {
return e == EINTR || e == EMFILE || e.Timeout()
}
func (e Errno) Timeout() bool {
return e == EAGAIN || e == EWOULDBLOCK || e == ETIMEDOUT
}
// Implemented in runtime/syscall_windows.go.
func compileCallback(fn any, cleanstack bool) uintptr
// NewCallback converts a Go function to a function pointer conforming to the stdcall calling convention.
// This is useful when interoperating with Windows code requiring callbacks.
// The argument is expected to be a function with one uintptr-sized result. The function must not have arguments with size larger than the size of uintptr.
// Only a limited number of callbacks may be created in a single Go process, and any memory allocated
// for these callbacks is never released.
// Between NewCallback and NewCallbackCDecl, at least 1024 callbacks can always be created.
func NewCallback(fn any) uintptr {
return compileCallback(fn, true)
}
// NewCallbackCDecl converts a Go function to a function pointer conforming to the cdecl calling convention.
// This is useful when interoperating with Windows code requiring callbacks.
// The argument is expected to be a function with one uintptr-sized result. The function must not have arguments with size larger than the size of uintptr.
// Only a limited number of callbacks may be created in a single Go process, and any memory allocated
// for these callbacks is never released.
// Between NewCallback and NewCallbackCDecl, at least 1024 callbacks can always be created.
func NewCallbackCDecl(fn any) uintptr {
return compileCallback(fn, false)
}
// windows api calls
//sys GetLastError() (lasterr error)
//sys LoadLibrary(libname string) (handle Handle, err error) = LoadLibraryW
//sys FreeLibrary(handle Handle) (err error)
//sys GetProcAddress(module Handle, procname string) (proc uintptr, err error)
//sys GetVersion() (ver uint32, err error)
//sys formatMessage(flags uint32, msgsrc uintptr, msgid uint32, langid uint32, buf []uint16, args *byte) (n uint32, err error) = FormatMessageW
//sys ExitProcess(exitcode uint32)
//sys createFile(name *uint16, access uint32, mode uint32, sa *SecurityAttributes, createmode uint32, attrs uint32, templatefile int32) (handle Handle, err error) [failretval == InvalidHandle || e1 == ERROR_ALREADY_EXISTS ] = CreateFileW
//sys readFile(handle Handle, buf []byte, done *uint32, overlapped *Overlapped) (err error) = ReadFile
//sys writeFile(handle Handle, buf []byte, done *uint32, overlapped *Overlapped) (err error) = WriteFile
//sys SetFilePointer(handle Handle, lowoffset int32, highoffsetptr *int32, whence uint32) (newlowoffset uint32, err error) [failretval==0xffffffff]
//sys CloseHandle(handle Handle) (err error)
//sys GetStdHandle(stdhandle int) (handle Handle, err error) [failretval==InvalidHandle]
//sys findFirstFile1(name *uint16, data *win32finddata1) (handle Handle, err error) [failretval==InvalidHandle] = FindFirstFileW
//sys findNextFile1(handle Handle, data *win32finddata1) (err error) = FindNextFileW
//sys FindClose(handle Handle) (err error)
//sys GetFileInformationByHandle(handle Handle, data *ByHandleFileInformation) (err error)
//sys GetCurrentDirectory(buflen uint32, buf *uint16) (n uint32, err error) = GetCurrentDirectoryW
//sys SetCurrentDirectory(path *uint16) (err error) = SetCurrentDirectoryW
//sys CreateDirectory(path *uint16, sa *SecurityAttributes) (err error) = CreateDirectoryW
//sys RemoveDirectory(path *uint16) (err error) = RemoveDirectoryW
//sys DeleteFile(path *uint16) (err error) = DeleteFileW
//sys MoveFile(from *uint16, to *uint16) (err error) = MoveFileW
//sys GetComputerName(buf *uint16, n *uint32) (err error) = GetComputerNameW
//sys SetEndOfFile(handle Handle) (err error)
//sys GetSystemTimeAsFileTime(time *Filetime)
//sys GetTimeZoneInformation(tzi *Timezoneinformation) (rc uint32, err error) [failretval==0xffffffff]
//sys createIoCompletionPort(filehandle Handle, cphandle Handle, key uintptr, threadcnt uint32) (handle Handle, err error) = CreateIoCompletionPort
//sys getQueuedCompletionStatus(cphandle Handle, qty *uint32, key *uintptr, overlapped **Overlapped, timeout uint32) (err error) = GetQueuedCompletionStatus
//sys postQueuedCompletionStatus(cphandle Handle, qty uint32, key uintptr, overlapped *Overlapped) (err error) = PostQueuedCompletionStatus
//sys CancelIo(s Handle) (err error)
//sys CancelIoEx(s Handle, o *Overlapped) (err error)
//sys CreateProcess(appName *uint16, commandLine *uint16, procSecurity *SecurityAttributes, threadSecurity *SecurityAttributes, inheritHandles bool, creationFlags uint32, env *uint16, currentDir *uint16, startupInfo *StartupInfo, outProcInfo *ProcessInformation) (err error) = CreateProcessW
//sys CreateProcessAsUser(token Token, appName *uint16, commandLine *uint16, procSecurity *SecurityAttributes, threadSecurity *SecurityAttributes, inheritHandles bool, creationFlags uint32, env *uint16, currentDir *uint16, startupInfo *StartupInfo, outProcInfo *ProcessInformation) (err error) = advapi32.CreateProcessAsUserW
//sys OpenProcess(da uint32, inheritHandle bool, pid uint32) (handle Handle, err error)
//sys TerminateProcess(handle Handle, exitcode uint32) (err error)
//sys GetExitCodeProcess(handle Handle, exitcode *uint32) (err error)
//sys getStartupInfo(startupInfo *StartupInfo) = GetStartupInfoW
//sys GetCurrentProcess() (pseudoHandle Handle, err error)
//sys GetProcessTimes(handle Handle, creationTime *Filetime, exitTime *Filetime, kernelTime *Filetime, userTime *Filetime) (err error)
//sys DuplicateHandle(hSourceProcessHandle Handle, hSourceHandle Handle, hTargetProcessHandle Handle, lpTargetHandle *Handle, dwDesiredAccess uint32, bInheritHandle bool, dwOptions uint32) (err error)
//sys WaitForSingleObject(handle Handle, waitMilliseconds uint32) (event uint32, err error) [failretval==0xffffffff]
//sys GetTempPath(buflen uint32, buf *uint16) (n uint32, err error) = GetTempPathW
//sys CreatePipe(readhandle *Handle, writehandle *Handle, sa *SecurityAttributes, size uint32) (err error)
//sys GetFileType(filehandle Handle) (n uint32, err error)
//sys CryptAcquireContext(provhandle *Handle, container *uint16, provider *uint16, provtype uint32, flags uint32) (err error) = advapi32.CryptAcquireContextW
//sys CryptReleaseContext(provhandle Handle, flags uint32) (err error) = advapi32.CryptReleaseContext
//sys CryptGenRandom(provhandle Handle, buflen uint32, buf *byte) (err error) = advapi32.CryptGenRandom
//sys GetEnvironmentStrings() (envs *uint16, err error) [failretval==nil] = kernel32.GetEnvironmentStringsW
//sys FreeEnvironmentStrings(envs *uint16) (err error) = kernel32.FreeEnvironmentStringsW
//sys GetEnvironmentVariable(name *uint16, buffer *uint16, size uint32) (n uint32, err error) = kernel32.GetEnvironmentVariableW
//sys SetEnvironmentVariable(name *uint16, value *uint16) (err error) = kernel32.SetEnvironmentVariableW
//sys SetFileTime(handle Handle, ctime *Filetime, atime *Filetime, wtime *Filetime) (err error)
//sys GetFileAttributes(name *uint16) (attrs uint32, err error) [failretval==INVALID_FILE_ATTRIBUTES] = kernel32.GetFileAttributesW
//sys SetFileAttributes(name *uint16, attrs uint32) (err error) = kernel32.SetFileAttributesW
//sys GetFileAttributesEx(name *uint16, level uint32, info *byte) (err error) = kernel32.GetFileAttributesExW
//sys GetCommandLine() (cmd *uint16) = kernel32.GetCommandLineW
//sys CommandLineToArgv(cmd *uint16, argc *int32) (argv *[8192]*[8192]uint16, err error) [failretval==nil] = shell32.CommandLineToArgvW
//sys LocalFree(hmem Handle) (handle Handle, err error) [failretval!=0]
//sys localAlloc(flags uint32, length uint32) (ptr uintptr, err error) = kernel32.LocalAlloc
//sys SetHandleInformation(handle Handle, mask uint32, flags uint32) (err error)
//sys FlushFileBuffers(handle Handle) (err error)
//sys GetFullPathName(path *uint16, buflen uint32, buf *uint16, fname **uint16) (n uint32, err error) = kernel32.GetFullPathNameW
//sys GetLongPathName(path *uint16, buf *uint16, buflen uint32) (n uint32, err error) = kernel32.GetLongPathNameW
//sys GetShortPathName(longpath *uint16, shortpath *uint16, buflen uint32) (n uint32, err error) = kernel32.GetShortPathNameW
//sys CreateFileMapping(fhandle Handle, sa *SecurityAttributes, prot uint32, maxSizeHigh uint32, maxSizeLow uint32, name *uint16) (handle Handle, err error) = kernel32.CreateFileMappingW
//sys MapViewOfFile(handle Handle, access uint32, offsetHigh uint32, offsetLow uint32, length uintptr) (addr uintptr, err error)
//sys UnmapViewOfFile(addr uintptr) (err error)
//sys FlushViewOfFile(addr uintptr, length uintptr) (err error)
//sys VirtualLock(addr uintptr, length uintptr) (err error)
//sys VirtualUnlock(addr uintptr, length uintptr) (err error)
//sys TransmitFile(s Handle, handle Handle, bytesToWrite uint32, bytsPerSend uint32, overlapped *Overlapped, transmitFileBuf *TransmitFileBuffers, flags uint32) (err error) = mswsock.TransmitFile
//sys ReadDirectoryChanges(handle Handle, buf *byte, buflen uint32, watchSubTree bool, mask uint32, retlen *uint32, overlapped *Overlapped, completionRoutine uintptr) (err error) = kernel32.ReadDirectoryChangesW
//sys CertOpenSystemStore(hprov Handle, name *uint16) (store Handle, err error) = crypt32.CertOpenSystemStoreW
//sys CertOpenStore(storeProvider uintptr, msgAndCertEncodingType uint32, cryptProv uintptr, flags uint32, para uintptr) (handle Handle, err error) = crypt32.CertOpenStore
//sys CertEnumCertificatesInStore(store Handle, prevContext *CertContext) (context *CertContext, err error) [failretval==nil] = crypt32.CertEnumCertificatesInStore
//sys CertAddCertificateContextToStore(store Handle, certContext *CertContext, addDisposition uint32, storeContext **CertContext) (err error) = crypt32.CertAddCertificateContextToStore
//sys CertCloseStore(store Handle, flags uint32) (err error) = crypt32.CertCloseStore
//sys CertGetCertificateChain(engine Handle, leaf *CertContext, time *Filetime, additionalStore Handle, para *CertChainPara, flags uint32, reserved uintptr, chainCtx **CertChainContext) (err error) = crypt32.CertGetCertificateChain
//sys CertFreeCertificateChain(ctx *CertChainContext) = crypt32.CertFreeCertificateChain
//sys CertCreateCertificateContext(certEncodingType uint32, certEncoded *byte, encodedLen uint32) (context *CertContext, err error) [failretval==nil] = crypt32.CertCreateCertificateContext
//sys CertFreeCertificateContext(ctx *CertContext) (err error) = crypt32.CertFreeCertificateContext
//sys CertVerifyCertificateChainPolicy(policyOID uintptr, chain *CertChainContext, para *CertChainPolicyPara, status *CertChainPolicyStatus) (err error) = crypt32.CertVerifyCertificateChainPolicy
//sys RegOpenKeyEx(key Handle, subkey *uint16, options uint32, desiredAccess uint32, result *Handle) (regerrno error) = advapi32.RegOpenKeyExW
//sys RegCloseKey(key Handle) (regerrno error) = advapi32.RegCloseKey
//sys RegQueryInfoKey(key Handle, class *uint16, classLen *uint32, reserved *uint32, subkeysLen *uint32, maxSubkeyLen *uint32, maxClassLen *uint32, valuesLen *uint32, maxValueNameLen *uint32, maxValueLen *uint32, saLen *uint32, lastWriteTime *Filetime) (regerrno error) = advapi32.RegQueryInfoKeyW
//sys regEnumKeyEx(key Handle, index uint32, name *uint16, nameLen *uint32, reserved *uint32, class *uint16, classLen *uint32, lastWriteTime *Filetime) (regerrno error) = advapi32.RegEnumKeyExW
//sys RegQueryValueEx(key Handle, name *uint16, reserved *uint32, valtype *uint32, buf *byte, buflen *uint32) (regerrno error) = advapi32.RegQueryValueExW
//sys getCurrentProcessId() (pid uint32) = kernel32.GetCurrentProcessId
//sys GetConsoleMode(console Handle, mode *uint32) (err error) = kernel32.GetConsoleMode
//sys WriteConsole(console Handle, buf *uint16, towrite uint32, written *uint32, reserved *byte) (err error) = kernel32.WriteConsoleW
//sys ReadConsole(console Handle, buf *uint16, toread uint32, read *uint32, inputControl *byte) (err error) = kernel32.ReadConsoleW
//sys CreateToolhelp32Snapshot(flags uint32, processId uint32) (handle Handle, err error) [failretval==InvalidHandle] = kernel32.CreateToolhelp32Snapshot
//sys Process32First(snapshot Handle, procEntry *ProcessEntry32) (err error) = kernel32.Process32FirstW
//sys Process32Next(snapshot Handle, procEntry *ProcessEntry32) (err error) = kernel32.Process32NextW
//sys DeviceIoControl(handle Handle, ioControlCode uint32, inBuffer *byte, inBufferSize uint32, outBuffer *byte, outBufferSize uint32, bytesReturned *uint32, overlapped *Overlapped) (err error)
//sys setFileInformationByHandle(handle Handle, fileInformationClass uint32, buf unsafe.Pointer, bufsize uint32) (err error) = kernel32.SetFileInformationByHandle
// This function returns 1 byte BOOLEAN rather than the 4 byte BOOL.
//sys CreateSymbolicLink(symlinkfilename *uint16, targetfilename *uint16, flags uint32) (err error) [failretval&0xff==0] = CreateSymbolicLinkW
//sys CreateHardLink(filename *uint16, existingfilename *uint16, reserved uintptr) (err error) [failretval&0xff==0] = CreateHardLinkW
//sys initializeProcThreadAttributeList(attrlist *_PROC_THREAD_ATTRIBUTE_LIST, attrcount uint32, flags uint32, size *uintptr) (err error) = InitializeProcThreadAttributeList
//sys deleteProcThreadAttributeList(attrlist *_PROC_THREAD_ATTRIBUTE_LIST) = DeleteProcThreadAttributeList
//sys updateProcThreadAttribute(attrlist *_PROC_THREAD_ATTRIBUTE_LIST, flags uint32, attr uintptr, value unsafe.Pointer, size uintptr, prevvalue unsafe.Pointer, returnedsize *uintptr) (err error) = UpdateProcThreadAttribute
//sys getFinalPathNameByHandle(file Handle, filePath *uint16, filePathSize uint32, flags uint32) (n uint32, err error) [n == 0 || n >= filePathSize] = kernel32.GetFinalPathNameByHandleW
// syscall interface implementation for other packages
func makeInheritSa() *SecurityAttributes {
var sa SecurityAttributes
sa.Length = uint32(unsafe.Sizeof(sa))
sa.InheritHandle = 1
return &sa
}
func Open(name string, flag int, perm uint32) (fd Handle, err error) {
if len(name) == 0 {
return InvalidHandle, ERROR_FILE_NOT_FOUND
}
namep, err := UTF16PtrFromString(name)
if err != nil {
return InvalidHandle, err
}
var access uint32
switch flag & (O_RDONLY | O_WRONLY | O_RDWR) {
case O_RDONLY:
access = GENERIC_READ
case O_WRONLY:
access = GENERIC_WRITE
case O_RDWR:
access = GENERIC_READ | GENERIC_WRITE
}
if flag&O_CREAT != 0 {
access |= GENERIC_WRITE
}
if flag&O_APPEND != 0 {
// Remove GENERIC_WRITE unless O_TRUNC is set, in which case we need it to truncate the file.
// We can't just remove FILE_WRITE_DATA because GENERIC_WRITE without FILE_WRITE_DATA
// starts appending at the beginning of the file rather than at the end.
if flag&O_TRUNC == 0 {
access &^= GENERIC_WRITE
}
// Set all access rights granted by GENERIC_WRITE except for FILE_WRITE_DATA.
access |= FILE_APPEND_DATA | FILE_WRITE_ATTRIBUTES | _FILE_WRITE_EA | STANDARD_RIGHTS_WRITE | SYNCHRONIZE
}
sharemode := uint32(FILE_SHARE_READ | FILE_SHARE_WRITE)
var sa *SecurityAttributes
if flag&O_CLOEXEC == 0 {
sa = makeInheritSa()
}
// We don't use CREATE_ALWAYS, because when opening a file with
// FILE_ATTRIBUTE_READONLY these will replace an existing file
// with a new, read-only one. See https://go.dev/issue/38225.
//
// Instead, we ftruncate the file after opening when O_TRUNC is set.
var createmode uint32
switch {
case flag&(O_CREAT|O_EXCL) == (O_CREAT | O_EXCL):
createmode = CREATE_NEW
case flag&O_CREAT == O_CREAT:
createmode = OPEN_ALWAYS
default:
createmode = OPEN_EXISTING
}
var attrs uint32 = FILE_ATTRIBUTE_NORMAL
if perm&S_IWRITE == 0 {
attrs = FILE_ATTRIBUTE_READONLY
}
if flag&O_WRONLY == 0 && flag&O_RDWR == 0 {
// We might be opening or creating a directory.
// CreateFile requires FILE_FLAG_BACKUP_SEMANTICS
// to work with directories.
attrs |= FILE_FLAG_BACKUP_SEMANTICS
}
if flag&O_SYNC != 0 {
const _FILE_FLAG_WRITE_THROUGH = 0x80000000
attrs |= _FILE_FLAG_WRITE_THROUGH
}
h, err := createFile(namep, access, sharemode, sa, createmode, attrs, 0)
if h == InvalidHandle {
if err == ERROR_ACCESS_DENIED && (flag&O_WRONLY != 0 || flag&O_RDWR != 0) {
// We should return EISDIR when we are trying to open a directory with write access.
fa, e1 := GetFileAttributes(namep)
if e1 == nil && fa&FILE_ATTRIBUTE_DIRECTORY != 0 {
err = EISDIR
}
}
return h, err
}
// Ignore O_TRUNC if the file has just been created.
if flag&O_TRUNC == O_TRUNC &&
(createmode == OPEN_EXISTING || (createmode == OPEN_ALWAYS && err == ERROR_ALREADY_EXISTS)) {
err = Ftruncate(h, 0)
if err != nil {
CloseHandle(h)
return InvalidHandle, err
}
}
return h, nil
}
func Read(fd Handle, p []byte) (n int, err error) {
var done uint32
e := ReadFile(fd, p, &done, nil)
if e != nil {
if e == ERROR_BROKEN_PIPE {
// NOTE(brainman): work around ERROR_BROKEN_PIPE is returned on reading EOF from stdin
return 0, nil
}
return 0, e
}
return int(done), nil
}
func Write(fd Handle, p []byte) (n int, err error) {
var done uint32
e := WriteFile(fd, p, &done, nil)
if e != nil {
return 0, e
}
return int(done), nil
}
func ReadFile(fd Handle, p []byte, done *uint32, overlapped *Overlapped) error {
err := readFile(fd, p, done, overlapped)
if race.Enabled {
if *done > 0 {
race.WriteRange(unsafe.Pointer(&p[0]), int(*done))
}
race.Acquire(unsafe.Pointer(&ioSync))
}
if msan.Enabled && *done > 0 {
msan.Write(unsafe.Pointer(&p[0]), uintptr(*done))
}
if asan.Enabled && *done > 0 {
asan.Write(unsafe.Pointer(&p[0]), uintptr(*done))
}
return err
}
func WriteFile(fd Handle, p []byte, done *uint32, overlapped *Overlapped) error {
if race.Enabled {
race.ReleaseMerge(unsafe.Pointer(&ioSync))
}
err := writeFile(fd, p, done, overlapped)
if race.Enabled && *done > 0 {
race.ReadRange(unsafe.Pointer(&p[0]), int(*done))
}
if msan.Enabled && *done > 0 {
msan.Read(unsafe.Pointer(&p[0]), uintptr(*done))
}
if asan.Enabled && *done > 0 {
asan.Read(unsafe.Pointer(&p[0]), uintptr(*done))
}
return err
}
var ioSync int64
var procSetFilePointerEx = modkernel32.NewProc("SetFilePointerEx")
const ptrSize = unsafe.Sizeof(uintptr(0))
// setFilePointerEx calls SetFilePointerEx.
// See https://learn.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-setfilepointerex
func setFilePointerEx(handle Handle, distToMove int64, newFilePointer *int64, whence uint32) error {
var e1 Errno
if unsafe.Sizeof(uintptr(0)) == 8 {
_, _, e1 = Syscall6(procSetFilePointerEx.Addr(), 4, uintptr(handle), uintptr(distToMove), uintptr(unsafe.Pointer(newFilePointer)), uintptr(whence), 0, 0)
} else {
// Different 32-bit systems disgaree about whether distToMove starts 8-byte aligned.
switch runtime.GOARCH {
default:
panic("unsupported 32-bit architecture")
case "386":
// distToMove is a LARGE_INTEGER, which is 64 bits.
_, _, e1 = Syscall6(procSetFilePointerEx.Addr(), 5, uintptr(handle), uintptr(distToMove), uintptr(distToMove>>32), uintptr(unsafe.Pointer(newFilePointer)), uintptr(whence), 0)
case "arm":
// distToMove must be 8-byte aligned per ARM calling convention
// https://docs.microsoft.com/en-us/cpp/build/overview-of-arm-abi-conventions#stage-c-assignment-of-arguments-to-registers-and-stack
_, _, e1 = Syscall6(procSetFilePointerEx.Addr(), 6, uintptr(handle), 0, uintptr(distToMove), uintptr(distToMove>>32), uintptr(unsafe.Pointer(newFilePointer)), uintptr(whence))
}
}
if e1 != 0 {
return errnoErr(e1)
}
return nil
}
func Seek(fd Handle, offset int64, whence int) (newoffset int64, err error) {
var w uint32
switch whence {
case 0:
w = FILE_BEGIN
case 1:
w = FILE_CURRENT
case 2:
w = FILE_END
}
err = setFilePointerEx(fd, offset, &newoffset, w)
return
}
func Close(fd Handle) (err error) {
return CloseHandle(fd)
}
var (
Stdin = getStdHandle(STD_INPUT_HANDLE)
Stdout = getStdHandle(STD_OUTPUT_HANDLE)
Stderr = getStdHandle(STD_ERROR_HANDLE)
)
func getStdHandle(h int) (fd Handle) {
r, _ := GetStdHandle(h)
return r
}
const ImplementsGetwd = true
func Getwd() (wd string, err error) {
b := make([]uint16, 300)
// The path of the current directory may not fit in the initial 300-word
// buffer when long path support is enabled. The current directory may also
// change between subsequent calls of GetCurrentDirectory. As a result, we
// need to retry the call in a loop until the current directory fits, each
// time with a bigger buffer.
for {
n, e := GetCurrentDirectory(uint32(len(b)), &b[0])
if e != nil {
return "", e
}
if int(n) <= len(b) {
return UTF16ToString(b[:n]), nil
}
b = make([]uint16, n)
}
}
func Chdir(path string) (err error) {
pathp, err := UTF16PtrFromString(path)
if err != nil {
return err
}
return SetCurrentDirectory(pathp)
}
func Mkdir(path string, mode uint32) (err error) {
pathp, err := UTF16PtrFromString(path)
if err != nil {
return err
}
return CreateDirectory(pathp, nil)
}
func Rmdir(path string) (err error) {
pathp, err := UTF16PtrFromString(path)
if err != nil {
return err
}
return RemoveDirectory(pathp)
}
func Unlink(path string) (err error) {
pathp, err := UTF16PtrFromString(path)
if err != nil {
return err
}
return DeleteFile(pathp)
}
func Rename(oldpath, newpath string) (err error) {
from, err := UTF16PtrFromString(oldpath)
if err != nil {
return err
}
to, err := UTF16PtrFromString(newpath)
if err != nil {
return err
}
return MoveFile(from, to)
}
func ComputerName() (name string, err error) {
var n uint32 = MAX_COMPUTERNAME_LENGTH + 1
b := make([]uint16, n)
e := GetComputerName(&b[0], &n)
if e != nil {
return "", e
}
return UTF16ToString(b[:n]), nil
}
func Ftruncate(fd Handle, length int64) (err error) {
type _FILE_END_OF_FILE_INFO struct {
EndOfFile int64
}
const FileEndOfFileInfo = 6
var info _FILE_END_OF_FILE_INFO
info.EndOfFile = length
return setFileInformationByHandle(fd, FileEndOfFileInfo, unsafe.Pointer(&info), uint32(unsafe.Sizeof(info)))
}
func Gettimeofday(tv *Timeval) (err error) {
var ft Filetime
GetSystemTimeAsFileTime(&ft)
*tv = NsecToTimeval(ft.Nanoseconds())
return nil
}
func Pipe(p []Handle) (err error) {
if len(p) != 2 {
return EINVAL
}
var r, w Handle
e := CreatePipe(&r, &w, makeInheritSa(), 0)
if e != nil {
return e
}
p[0] = r
p[1] = w
return nil
}
func Utimes(path string, tv []Timeval) (err error) {
if len(tv) != 2 {
return EINVAL
}
pathp, e := UTF16PtrFromString(path)
if e != nil {
return e
}
h, e := CreateFile(pathp,
FILE_WRITE_ATTRIBUTES, FILE_SHARE_WRITE, nil,
OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0)
if e != nil {
return e
}
defer Close(h)
a := Filetime{}
w := Filetime{}
if tv[0].Nanoseconds() != 0 {
a = NsecToFiletime(tv[0].Nanoseconds())
}
if tv[0].Nanoseconds() != 0 {
w = NsecToFiletime(tv[1].Nanoseconds())
}
return SetFileTime(h, nil, &a, &w)
}
// This matches the value in os/file_windows.go.
const _UTIME_OMIT = -1
func UtimesNano(path string, ts []Timespec) (err error) {
if len(ts) != 2 {
return EINVAL
}
pathp, e := UTF16PtrFromString(path)
if e != nil {
return e
}
h, e := CreateFile(pathp,
FILE_WRITE_ATTRIBUTES, FILE_SHARE_WRITE, nil,
OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0)
if e != nil {
return e
}
defer Close(h)
a := Filetime{}
w := Filetime{}
if ts[0].Nsec != _UTIME_OMIT {
a = NsecToFiletime(TimespecToNsec(ts[0]))
}
if ts[1].Nsec != _UTIME_OMIT {
w = NsecToFiletime(TimespecToNsec(ts[1]))
}
return SetFileTime(h, nil, &a, &w)
}
func Fsync(fd Handle) (err error) {
return FlushFileBuffers(fd)
}
func Chmod(path string, mode uint32) (err error) {
p, e := UTF16PtrFromString(path)
if e != nil {
return e
}
attrs, e := GetFileAttributes(p)
if e != nil {
return e
}
if mode&S_IWRITE != 0 {
attrs &^= FILE_ATTRIBUTE_READONLY
} else {
attrs |= FILE_ATTRIBUTE_READONLY
}
return SetFileAttributes(p, attrs)
}
func LoadCancelIoEx() error {
return procCancelIoEx.Find()
}
func LoadSetFileCompletionNotificationModes() error {
return procSetFileCompletionNotificationModes.Find()
}
// net api calls
const socket_error = uintptr(^uint32(0))
//sys WSAStartup(verreq uint32, data *WSAData) (sockerr error) = ws2_32.WSAStartup
//sys WSACleanup() (err error) [failretval==socket_error] = ws2_32.WSACleanup
//sys WSAIoctl(s Handle, iocc uint32, inbuf *byte, cbif uint32, outbuf *byte, cbob uint32, cbbr *uint32, overlapped *Overlapped, completionRoutine uintptr) (err error) [failretval==socket_error] = ws2_32.WSAIoctl
//sys socket(af int32, typ int32, protocol int32) (handle Handle, err error) [failretval==InvalidHandle] = ws2_32.socket
//sys Setsockopt(s Handle, level int32, optname int32, optval *byte, optlen int32) (err error) [failretval==socket_error] = ws2_32.setsockopt
//sys Getsockopt(s Handle, level int32, optname int32, optval *byte, optlen *int32) (err error) [failretval==socket_error] = ws2_32.getsockopt
//sys bind(s Handle, name unsafe.Pointer, namelen int32) (err error) [failretval==socket_error] = ws2_32.bind
//sys connect(s Handle, name unsafe.Pointer, namelen int32) (err error) [failretval==socket_error] = ws2_32.connect
//sys getsockname(s Handle, rsa *RawSockaddrAny, addrlen *int32) (err error) [failretval==socket_error] = ws2_32.getsockname
//sys getpeername(s Handle, rsa *RawSockaddrAny, addrlen *int32) (err error) [failretval==socket_error] = ws2_32.getpeername
//sys listen(s Handle, backlog int32) (err error) [failretval==socket_error] = ws2_32.listen
//sys shutdown(s Handle, how int32) (err error) [failretval==socket_error] = ws2_32.shutdown
//sys Closesocket(s Handle) (err error) [failretval==socket_error] = ws2_32.closesocket
//sys AcceptEx(ls Handle, as Handle, buf *byte, rxdatalen uint32, laddrlen uint32, raddrlen uint32, recvd *uint32, overlapped *Overlapped) (err error) = mswsock.AcceptEx
//sys GetAcceptExSockaddrs(buf *byte, rxdatalen uint32, laddrlen uint32, raddrlen uint32, lrsa **RawSockaddrAny, lrsalen *int32, rrsa **RawSockaddrAny, rrsalen *int32) = mswsock.GetAcceptExSockaddrs
//sys WSARecv(s Handle, bufs *WSABuf, bufcnt uint32, recvd *uint32, flags *uint32, overlapped *Overlapped, croutine *byte) (err error) [failretval==socket_error] = ws2_32.WSARecv
//sys WSASend(s Handle, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, overlapped *Overlapped, croutine *byte) (err error) [failretval==socket_error] = ws2_32.WSASend
//sys WSARecvFrom(s Handle, bufs *WSABuf, bufcnt uint32, recvd *uint32, flags *uint32, from *RawSockaddrAny, fromlen *int32, overlapped *Overlapped, croutine *byte) (err error) [failretval==socket_error] = ws2_32.WSARecvFrom
//sys WSASendTo(s Handle, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, to *RawSockaddrAny, tolen int32, overlapped *Overlapped, croutine *byte) (err error) [failretval==socket_error] = ws2_32.WSASendTo
//sys GetHostByName(name string) (h *Hostent, err error) [failretval==nil] = ws2_32.gethostbyname
//sys GetServByName(name string, proto string) (s *Servent, err error) [failretval==nil] = ws2_32.getservbyname
//sys Ntohs(netshort uint16) (u uint16) = ws2_32.ntohs
//sys GetProtoByName(name string) (p *Protoent, err error) [failretval==nil] = ws2_32.getprotobyname
//sys DnsQuery(name string, qtype uint16, options uint32, extra *byte, qrs **DNSRecord, pr *byte) (status error) = dnsapi.DnsQuery_W
//sys DnsRecordListFree(rl *DNSRecord, freetype uint32) = dnsapi.DnsRecordListFree
//sys DnsNameCompare(name1 *uint16, name2 *uint16) (same bool) = dnsapi.DnsNameCompare_W
//sys GetAddrInfoW(nodename *uint16, servicename *uint16, hints *AddrinfoW, result **AddrinfoW) (sockerr error) = ws2_32.GetAddrInfoW
//sys FreeAddrInfoW(addrinfo *AddrinfoW) = ws2_32.FreeAddrInfoW
//sys GetIfEntry(pIfRow *MibIfRow) (errcode error) = iphlpapi.GetIfEntry
//sys GetAdaptersInfo(ai *IpAdapterInfo, ol *uint32) (errcode error) = iphlpapi.GetAdaptersInfo
//sys SetFileCompletionNotificationModes(handle Handle, flags uint8) (err error) = kernel32.SetFileCompletionNotificationModes
//sys WSAEnumProtocols(protocols *int32, protocolBuffer *WSAProtocolInfo, bufferLength *uint32) (n int32, err error) [failretval==-1] = ws2_32.WSAEnumProtocolsW
// For testing: clients can set this flag to force
// creation of IPv6 sockets to return [EAFNOSUPPORT].
var SocketDisableIPv6 bool
type RawSockaddrInet4 struct {
Family uint16
Port uint16
Addr [4]byte /* in_addr */
Zero [8]uint8
}
type RawSockaddrInet6 struct {
Family uint16
Port uint16
Flowinfo uint32
Addr [16]byte /* in6_addr */
Scope_id uint32
}
type RawSockaddr struct {
Family uint16
Data [14]int8
}
type RawSockaddrAny struct {
Addr RawSockaddr
Pad [100]int8
}
type Sockaddr interface {
sockaddr() (ptr unsafe.Pointer, len int32, err error) // lowercase; only we can define Sockaddrs
}
type SockaddrInet4 struct {
Port int
Addr [4]byte
raw RawSockaddrInet4
}
func (sa *SockaddrInet4) sockaddr() (unsafe.Pointer, int32, error) {
if sa.Port < 0 || sa.Port > 0xFFFF {
return nil, 0, EINVAL
}
sa.raw.Family = AF_INET
p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
p[0] = byte(sa.Port >> 8)
p[1] = byte(sa.Port)
sa.raw.Addr = sa.Addr
return unsafe.Pointer(&sa.raw), int32(unsafe.Sizeof(sa.raw)), nil
}
type SockaddrInet6 struct {
Port int
ZoneId uint32
Addr [16]byte
raw RawSockaddrInet6
}
func (sa *SockaddrInet6) sockaddr() (unsafe.Pointer, int32, error) {
if sa.Port < 0 || sa.Port > 0xFFFF {
return nil, 0, EINVAL
}
sa.raw.Family = AF_INET6
p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
p[0] = byte(sa.Port >> 8)
p[1] = byte(sa.Port)
sa.raw.Scope_id = sa.ZoneId
sa.raw.Addr = sa.Addr
return unsafe.Pointer(&sa.raw), int32(unsafe.Sizeof(sa.raw)), nil
}
type RawSockaddrUnix struct {
Family uint16
Path [UNIX_PATH_MAX]int8
}
type SockaddrUnix struct {
Name string
raw RawSockaddrUnix
}
func (sa *SockaddrUnix) sockaddr() (unsafe.Pointer, int32, error) {
name := sa.Name
n := len(name)
if n > len(sa.raw.Path) {
return nil, 0, EINVAL
}
// Abstract addresses start with NUL.
// '@' is also a valid way to specify abstract addresses.
isAbstract := n > 0 && (name[0] == '@' || name[0] == '\x00')
// Non-abstract named addresses are NUL terminated.
// The length can't use the full capacity as we need to add NUL.
if n == len(sa.raw.Path) && !isAbstract {
return nil, 0, EINVAL
}
sa.raw.Family = AF_UNIX
for i := 0; i < n; i++ {
sa.raw.Path[i] = int8(name[i])
}
// Length is family + name (+ NUL if non-abstract).
// Family is of type uint16 (2 bytes).
sl := int32(2 + n)
if isAbstract {
// Abstract addresses are not NUL terminated.
// We rewrite '@' prefix to NUL here.
sa.raw.Path[0] = 0
} else if n > 0 {
// Add NUL for non-abstract named addresses.
sl++
}
return unsafe.Pointer(&sa.raw), sl, nil
}
func (rsa *RawSockaddrAny) Sockaddr() (Sockaddr, error) {
switch rsa.Addr.Family {
case AF_UNIX:
pp := (*RawSockaddrUnix)(unsafe.Pointer(rsa))
sa := new(SockaddrUnix)
if pp.Path[0] == 0 {
// "Abstract" Unix domain socket.
// Rewrite leading NUL as @ for textual display.
// (This is the standard convention.)
// Not friendly to overwrite in place,
// but the callers below don't care.
pp.Path[0] = '@'
}
// Assume path ends at NUL.
// This is not technically the Linux semantics for
// abstract Unix domain sockets--they are supposed
// to be uninterpreted fixed-size binary blobs--but
// everyone uses this convention.
n := 0
for n < len(pp.Path) && pp.Path[n] != 0 {
n++
}
sa.Name = string(unsafe.Slice((*byte)(unsafe.Pointer(&pp.Path[0])), n))
return sa, nil
case AF_INET:
pp := (*RawSockaddrInet4)(unsafe.Pointer(rsa))
sa := new(SockaddrInet4)
p := (*[2]byte)(unsafe.Pointer(&pp.Port))
sa.Port = int(p[0])<<8 + int(p[1])
sa.Addr = pp.Addr
return sa, nil
case AF_INET6:
pp := (*RawSockaddrInet6)(unsafe.Pointer(rsa))
sa := new(SockaddrInet6)
p := (*[2]byte)(unsafe.Pointer(&pp.Port))
sa.Port = int(p[0])<<8 + int(p[1])
sa.ZoneId = pp.Scope_id
sa.Addr = pp.Addr
return sa, nil
}
return nil, EAFNOSUPPORT
}
func Socket(domain, typ, proto int) (fd Handle, err error) {
if domain == AF_INET6 && SocketDisableIPv6 {
return InvalidHandle, EAFNOSUPPORT
}
return socket(int32(domain), int32(typ), int32(proto))
}
func SetsockoptInt(fd Handle, level, opt int, value int) (err error) {
v := int32(value)
return Setsockopt(fd, int32(level), int32(opt), (*byte)(unsafe.Pointer(&v)), int32(unsafe.Sizeof(v)))
}
func Bind(fd Handle, sa Sockaddr) (err error) {
ptr, n, err := sa.sockaddr()
if err != nil {
return err
}
return bind(fd, ptr, n)
}
func Connect(fd Handle, sa Sockaddr) (err error) {
ptr, n, err := sa.sockaddr()
if err != nil {
return err
}
return connect(fd, ptr, n)
}
func Getsockname(fd Handle) (sa Sockaddr, err error) {
var rsa RawSockaddrAny
l := int32(unsafe.Sizeof(rsa))
if err = getsockname(fd, &rsa, &l); err != nil {
return
}
return rsa.Sockaddr()
}
func Getpeername(fd Handle) (sa Sockaddr, err error) {
var rsa RawSockaddrAny
l := int32(unsafe.Sizeof(rsa))
if err = getpeername(fd, &rsa, &l); err != nil {
return
}
return rsa.Sockaddr()
}
func Listen(s Handle, n int) (err error) {
return listen(s, int32(n))
}
func Shutdown(fd Handle, how int) (err error) {
return shutdown(fd, int32(how))
}
func WSASendto(s Handle, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, to Sockaddr, overlapped *Overlapped, croutine *byte) (err error) {
var rsa unsafe.Pointer
var len int32
if to != nil {
rsa, len, err = to.sockaddr()
if err != nil {
return err
}
}
r1, _, e1 := Syscall9(procWSASendTo.Addr(), 9, uintptr(s), uintptr(unsafe.Pointer(bufs)), uintptr(bufcnt), uintptr(unsafe.Pointer(sent)), uintptr(flags), uintptr(unsafe.Pointer(rsa)), uintptr(len), uintptr(unsafe.Pointer(overlapped)), uintptr(unsafe.Pointer(croutine)))
if r1 == socket_error {