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Source file src/os/stat_plan9.go

Documentation: os

  // Copyright 2011 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 (
  	"syscall"
  	"time"
  )
  
  const _BIT16SZ = 2
  
  func fileInfoFromStat(d *syscall.Dir) FileInfo {
  	fs := &fileStat{
  		name:    d.Name,
  		size:    d.Length,
  		modTime: time.Unix(int64(d.Mtime), 0),
  		sys:     d,
  	}
  	fs.mode = FileMode(d.Mode & 0777)
  	if d.Mode&syscall.DMDIR != 0 {
  		fs.mode |= ModeDir
  	}
  	if d.Mode&syscall.DMAPPEND != 0 {
  		fs.mode |= ModeAppend
  	}
  	if d.Mode&syscall.DMEXCL != 0 {
  		fs.mode |= ModeExclusive
  	}
  	if d.Mode&syscall.DMTMP != 0 {
  		fs.mode |= ModeTemporary
  	}
  	// Consider all files not served by #M as device files.
  	if d.Type != 'M' {
  		fs.mode |= ModeDevice
  	}
  	return fs
  }
  
  // arg is an open *File or a path string.
  func dirstat(arg interface{}) (*syscall.Dir, error) {
  	var name string
  	var err error
  
  	size := syscall.STATFIXLEN + 16*4
  
  	for i := 0; i < 2; i++ {
  		buf := make([]byte, _BIT16SZ+size)
  
  		var n int
  		switch a := arg.(type) {
  		case *File:
  			name = a.name
  			n, err = syscall.Fstat(a.fd, buf)
  		case string:
  			name = a
  			n, err = syscall.Stat(a, buf)
  		default:
  			panic("phase error in dirstat")
  		}
  
  		if n < _BIT16SZ {
  			return nil, &PathError{"stat", name, err}
  		}
  
  		// Pull the real size out of the stat message.
  		size = int(uint16(buf[0]) | uint16(buf[1])<<8)
  
  		// If the stat message is larger than our buffer we will
  		// go around the loop and allocate one that is big enough.
  		if size <= n {
  			d, err := syscall.UnmarshalDir(buf[:n])
  			if err != nil {
  				return nil, &PathError{"stat", name, err}
  			}
  			return d, nil
  		}
  
  	}
  
  	if err == nil {
  		err = syscall.ErrBadStat
  	}
  
  	return nil, &PathError{"stat", name, err}
  }
  
  // Stat returns a FileInfo describing the named file.
  // If there is an error, it will be of type *PathError.
  func Stat(name string) (FileInfo, error) {
  	d, err := dirstat(name)
  	if err != nil {
  		return nil, err
  	}
  	return fileInfoFromStat(d), nil
  }
  
  // Lstat returns a FileInfo describing the named file.
  // If the file is a symbolic link, the returned FileInfo
  // describes the symbolic link. Lstat makes no attempt to follow the link.
  // If there is an error, it will be of type *PathError.
  func Lstat(name string) (FileInfo, error) {
  	return Stat(name)
  }
  
  // For testing.
  func atime(fi FileInfo) time.Time {
  	return time.Unix(int64(fi.Sys().(*syscall.Dir).Atime), 0)
  }
  

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