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Go 1.24.1.

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Nuno Cruces
2025-03-14 00:54:12 +00:00
parent d78239bfbf
commit eba71b1f42
1 changed files with 56 additions and 45 deletions
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101
util/osutil/open_windows.go
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@@ -15,27 +15,28 @@ func OpenFile(name string, flag int, perm fs.FileMode) (*os.File, error) {
if name == "" {
return nil, &os.PathError{Op: "open", Path: name, Err: ENOENT}
}
r, e := syscallOpen(name, flag|O_CLOEXEC, uint32(perm.Perm()))
if e != nil {
return nil, &os.PathError{Op: "open", Path: name, Err: e}
r, err := syscallOpen(name, flag|O_CLOEXEC, uint32(perm.Perm()))
if err != nil {
return nil, &os.PathError{Op: "open", Path: name, Err: err}
}
return os.NewFile(uintptr(r), name), nil
}
// syscallOpen is a copy of [syscall.Open]
// that uses [syscall.FILE_SHARE_DELETE].
// that uses [syscall.FILE_SHARE_DELETE],
// and supports [syscall.FILE_FLAG_OVERLAPPED].
//
// https://go.dev/src/syscall/syscall_windows.go
func syscallOpen(path string, mode int, perm uint32) (fd Handle, err error) {
if len(path) == 0 {
func syscallOpen(name string, flag int, perm uint32) (fd Handle, err error) {
if len(name) == 0 {
return InvalidHandle, ERROR_FILE_NOT_FOUND
}
pathp, err := UTF16PtrFromString(path)
namep, err := UTF16PtrFromString(name)
if err != nil {
return InvalidHandle, err
}
var access uint32
switch mode & (O_RDONLY | O_WRONLY | O_RDWR) {
switch flag & (O_RDONLY | O_WRONLY | O_RDWR) {
case O_RDONLY:
access = GENERIC_READ
case O_WRONLY:
@@ -43,68 +44,76 @@ func syscallOpen(path string, mode int, perm uint32) (fd Handle, err error) {
case O_RDWR:
access = GENERIC_READ | GENERIC_WRITE
}
if mode&O_CREAT != 0 {
if flag&O_CREAT != 0 {
access |= GENERIC_WRITE
}
if mode&O_APPEND != 0 {
access &^= GENERIC_WRITE
access |= FILE_APPEND_DATA
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 | FILE_SHARE_DELETE)
var sa *SecurityAttributes
if mode&O_CLOEXEC == 0 {
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 mode&(O_CREAT|O_EXCL) == (O_CREAT | O_EXCL):
case flag&(O_CREAT|O_EXCL) == (O_CREAT | O_EXCL):
createmode = CREATE_NEW
case mode&(O_CREAT|O_TRUNC) == (O_CREAT | O_TRUNC):
createmode = CREATE_ALWAYS
case mode&O_CREAT == O_CREAT:
case flag&O_CREAT == O_CREAT:
createmode = OPEN_ALWAYS
case mode&O_TRUNC == O_TRUNC:
createmode = TRUNCATE_EXISTING
default:
createmode = OPEN_EXISTING
}
var attrs uint32 = FILE_ATTRIBUTE_NORMAL
if perm&S_IWRITE == 0 {
attrs = FILE_ATTRIBUTE_READONLY
if createmode == CREATE_ALWAYS {
const _ERROR_BAD_NETPATH = Errno(53)
// We have been asked to create a read-only file.
// If the file already exists, the semantics of
// the Unix open system call is to preserve the
// existing permissions. If we pass CREATE_ALWAYS
// and FILE_ATTRIBUTE_READONLY to CreateFile,
// and the file already exists, CreateFile will
// change the file permissions.
// Avoid that to preserve the Unix semantics.
h, e := CreateFile(pathp, access, sharemode, sa, TRUNCATE_EXISTING, FILE_ATTRIBUTE_NORMAL, 0)
switch e {
case ERROR_FILE_NOT_FOUND, _ERROR_BAD_NETPATH, ERROR_PATH_NOT_FOUND:
// File does not exist. These are the same
// errors as Errno.Is checks for ErrNotExist.
// Carry on to create the file.
default:
// Success or some different error.
return h, e
}
}
}
if createmode == OPEN_EXISTING && access == GENERIC_READ {
// Necessary for opening directory handles.
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 mode&O_SYNC != 0 {
if flag&O_SYNC != 0 {
const _FILE_FLAG_WRITE_THROUGH = 0x80000000
attrs |= _FILE_FLAG_WRITE_THROUGH
}
if mode&O_NONBLOCK != 0 {
if flag&O_NONBLOCK != 0 {
attrs |= FILE_FLAG_OVERLAPPED
}
return CreateFile(pathp, access, sharemode, sa, createmode, attrs, 0)
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 makeInheritSa() *SecurityAttributes {
@@ -113,3 +122,5 @@ func makeInheritSa() *SecurityAttributes {
sa.InheritHandle = 1
return &sa
}
const _FILE_WRITE_EA = 0x00000010