62 lines
2.1 KiB
Go
62 lines
2.1 KiB
Go
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// +build windows
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package winio
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import (
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"os"
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"runtime"
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"syscall"
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"unsafe"
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)
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//sys getFileInformationByHandleEx(h syscall.Handle, class uint32, buffer *byte, size uint32) (err error) = GetFileInformationByHandleEx
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//sys setFileInformationByHandle(h syscall.Handle, class uint32, buffer *byte, size uint32) (err error) = SetFileInformationByHandle
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const (
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fileBasicInfo = 0
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fileIDInfo = 0x12
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)
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// FileBasicInfo contains file access time and file attributes information.
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type FileBasicInfo struct {
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CreationTime, LastAccessTime, LastWriteTime, ChangeTime syscall.Filetime
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FileAttributes uint32
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pad uint32 // padding
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}
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// GetFileBasicInfo retrieves times and attributes for a file.
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func GetFileBasicInfo(f *os.File) (*FileBasicInfo, error) {
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bi := &FileBasicInfo{}
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if err := getFileInformationByHandleEx(syscall.Handle(f.Fd()), fileBasicInfo, (*byte)(unsafe.Pointer(bi)), uint32(unsafe.Sizeof(*bi))); err != nil {
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return nil, &os.PathError{Op: "GetFileInformationByHandleEx", Path: f.Name(), Err: err}
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}
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runtime.KeepAlive(f)
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return bi, nil
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}
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// SetFileBasicInfo sets times and attributes for a file.
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func SetFileBasicInfo(f *os.File, bi *FileBasicInfo) error {
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if err := setFileInformationByHandle(syscall.Handle(f.Fd()), fileBasicInfo, (*byte)(unsafe.Pointer(bi)), uint32(unsafe.Sizeof(*bi))); err != nil {
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return &os.PathError{Op: "SetFileInformationByHandle", Path: f.Name(), Err: err}
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}
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runtime.KeepAlive(f)
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return nil
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}
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// FileIDInfo contains the volume serial number and file ID for a file. This pair should be
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// unique on a system.
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type FileIDInfo struct {
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VolumeSerialNumber uint64
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FileID [16]byte
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}
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// GetFileID retrieves the unique (volume, file ID) pair for a file.
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func GetFileID(f *os.File) (*FileIDInfo, error) {
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fileID := &FileIDInfo{}
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if err := getFileInformationByHandleEx(syscall.Handle(f.Fd()), fileIDInfo, (*byte)(unsafe.Pointer(fileID)), uint32(unsafe.Sizeof(*fileID))); err != nil {
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return nil, &os.PathError{Op: "GetFileInformationByHandleEx", Path: f.Name(), Err: err}
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}
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runtime.KeepAlive(f)
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return fileID, nil
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}
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