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Source file src/os/types_windows.go

Documentation: os

  // 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.
  
  package os
  
  import (
  	"sync"
  	"syscall"
  	"time"
  )
  
  // A fileStat is the implementation of FileInfo returned by Stat and Lstat.
  type fileStat struct {
  	name     string
  	sys      syscall.Win32FileAttributeData
  	filetype uint32 // what syscall.GetFileType returns
  
  	// used to implement SameFile
  	sync.Mutex
  	path             string
  	vol              uint32
  	idxhi            uint32
  	idxlo            uint32
  	appendNameToPath bool
  }
  
  func (fs *fileStat) Size() int64 {
  	return int64(fs.sys.FileSizeHigh)<<32 + int64(fs.sys.FileSizeLow)
  }
  
  func (fs *fileStat) Mode() (m FileMode) {
  	if fs == &devNullStat {
  		return ModeDevice | ModeCharDevice | 0666
  	}
  	if fs.sys.FileAttributes&syscall.FILE_ATTRIBUTE_READONLY != 0 {
  		m |= 0444
  	} else {
  		m |= 0666
  	}
  	if fs.sys.FileAttributes&syscall.FILE_ATTRIBUTE_REPARSE_POINT != 0 {
  		return m | ModeSymlink
  	}
  	if fs.sys.FileAttributes&syscall.FILE_ATTRIBUTE_DIRECTORY != 0 {
  		m |= ModeDir | 0111
  	}
  	switch fs.filetype {
  	case syscall.FILE_TYPE_PIPE:
  		m |= ModeNamedPipe
  	case syscall.FILE_TYPE_CHAR:
  		m |= ModeCharDevice
  	}
  	return m
  }
  
  func (fs *fileStat) ModTime() time.Time {
  	return time.Unix(0, fs.sys.LastWriteTime.Nanoseconds())
  }
  
  // Sys returns syscall.Win32FileAttributeData for file fs.
  func (fs *fileStat) Sys() interface{} { return &fs.sys }
  
  func (fs *fileStat) loadFileId() error {
  	fs.Lock()
  	defer fs.Unlock()
  	if fs.path == "" {
  		// already done
  		return nil
  	}
  	var path string
  	if fs.appendNameToPath {
  		path = fs.path + `\` + fs.name
  	} else {
  		path = fs.path
  	}
  	pathp, err := syscall.UTF16PtrFromString(path)
  	if err != nil {
  		return err
  	}
  	h, err := syscall.CreateFile(pathp, 0, 0, nil, syscall.OPEN_EXISTING, syscall.FILE_FLAG_BACKUP_SEMANTICS, 0)
  	if err != nil {
  		return err
  	}
  	defer syscall.CloseHandle(h)
  	var i syscall.ByHandleFileInformation
  	err = syscall.GetFileInformationByHandle(h, &i)
  	if err != nil {
  		return err
  	}
  	fs.path = ""
  	fs.vol = i.VolumeSerialNumber
  	fs.idxhi = i.FileIndexHigh
  	fs.idxlo = i.FileIndexLow
  	return nil
  }
  
  // devNullStat is fileStat structure describing DevNull file ("NUL").
  var devNullStat = fileStat{
  	name: DevNull,
  	// hopefully this will work for SameFile
  	vol:   0,
  	idxhi: 0,
  	idxlo: 0,
  }
  
  func sameFile(fs1, fs2 *fileStat) bool {
  	e := fs1.loadFileId()
  	if e != nil {
  		return false
  	}
  	e = fs2.loadFileId()
  	if e != nil {
  		return false
  	}
  	return fs1.vol == fs2.vol && fs1.idxhi == fs2.idxhi && fs1.idxlo == fs2.idxlo
  }
  
  // For testing.
  func atime(fi FileInfo) time.Time {
  	return time.Unix(0, fi.Sys().(*syscall.Win32FileAttributeData).LastAccessTime.Nanoseconds())
  }
  

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