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//go:build (amd64 || arm64) && windows
package sysfs
import (
"io/fs"
"syscall"
experimentalsys "github.com/tetratelabs/wazero/experimental/sys"
"github.com/tetratelabs/wazero/sys"
)
// dirNlinkIncludesDot is false because Windows does not return dot entries.
//
// Note: this is only used in tests
const dirNlinkIncludesDot = false
func lstat(path string) (sys.Stat_t, experimentalsys.Errno) {
attrs := uint32(syscall.FILE_FLAG_BACKUP_SEMANTICS)
// Use FILE_FLAG_OPEN_REPARSE_POINT, otherwise CreateFile will follow symlink.
// See https://docs.microsoft.com/en-us/windows/desktop/FileIO/symbolic-link-effects-on-file-systems-functions#createfile-and-createfiletransacted
attrs |= syscall.FILE_FLAG_OPEN_REPARSE_POINT
return statPath(attrs, path)
}
func stat(path string) (sys.Stat_t, experimentalsys.Errno) {
attrs := uint32(syscall.FILE_FLAG_BACKUP_SEMANTICS)
return statPath(attrs, path)
}
func statPath(createFileAttrs uint32, path string) (sys.Stat_t, experimentalsys.Errno) {
if len(path) == 0 {
return sys.Stat_t{}, experimentalsys.ENOENT
}
pathp, err := syscall.UTF16PtrFromString(path)
if err != nil {
return sys.Stat_t{}, experimentalsys.EINVAL
}
// open the file handle
h, err := syscall.CreateFile(pathp, 0, 0, nil,
syscall.OPEN_EXISTING, createFileAttrs, 0)
if err != nil {
errno := experimentalsys.UnwrapOSError(err)
// To match expectations of WASI, e.g. TinyGo TestStatBadDir, return
// ENOENT, not ENOTDIR.
if errno == experimentalsys.ENOTDIR {
errno = experimentalsys.ENOENT
}
return sys.Stat_t{}, errno
}
defer syscall.CloseHandle(h)
return statHandle(h)
}
// fdFile allows masking the `Fd` function on os.File.
type fdFile interface {
Fd() uintptr
}
func statFile(f fs.File) (sys.Stat_t, experimentalsys.Errno) {
if osF, ok := f.(fdFile); ok {
// Attempt to get the stat by handle, which works for normal files
st, err := statHandle(syscall.Handle(osF.Fd()))
// ERROR_INVALID_HANDLE happens before Go 1.20. Don't fail as we only
// use that approach to fill in inode data, which is not critical.
//
// Note: statHandle uses UnwrapOSError which coerces
// ERROR_INVALID_HANDLE to EBADF.
if err != experimentalsys.EBADF {
return st, err
}
}
return defaultStatFile(f)
}
func statHandle(h syscall.Handle) (sys.Stat_t, experimentalsys.Errno) {
winFt, err := syscall.GetFileType(h)
if err != nil {
return sys.Stat_t{}, experimentalsys.UnwrapOSError(err)
}
var fi syscall.ByHandleFileInformation
if err = syscall.GetFileInformationByHandle(h, &fi); err != nil {
return sys.Stat_t{}, experimentalsys.UnwrapOSError(err)
}
var m fs.FileMode
if fi.FileAttributes&syscall.FILE_ATTRIBUTE_READONLY != 0 {
m |= 0o444
} else {
m |= 0o666
}
switch { // check whether this is a symlink first
case fi.FileAttributes&syscall.FILE_ATTRIBUTE_REPARSE_POINT != 0:
m |= fs.ModeSymlink
case winFt == syscall.FILE_TYPE_PIPE:
m |= fs.ModeNamedPipe
case winFt == syscall.FILE_TYPE_CHAR:
m |= fs.ModeDevice | fs.ModeCharDevice
case fi.FileAttributes&syscall.FILE_ATTRIBUTE_DIRECTORY != 0:
m |= fs.ModeDir | 0o111 // e.g. 0o444 -> 0o555
}
st := sys.Stat_t{}
// FileIndex{High,Low} can be combined and used as a unique identifier like inode.
// https://learn.microsoft.com/en-us/windows/win32/api/fileapi/ns-fileapi-by_handle_file_information
st.Dev = uint64(fi.VolumeSerialNumber)
st.Ino = (uint64(fi.FileIndexHigh) << 32) | uint64(fi.FileIndexLow)
st.Mode = m
st.Nlink = uint64(fi.NumberOfLinks)
st.Size = int64(fi.FileSizeHigh)<<32 + int64(fi.FileSizeLow)
st.Atim = fi.LastAccessTime.Nanoseconds()
st.Mtim = fi.LastWriteTime.Nanoseconds()
st.Ctim = fi.CreationTime.Nanoseconds()
return st, 0
}
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