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- // 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 bitSize16 = 2
- func fileInfoFromStat(d *syscall.Dir) *fileStat {
- 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
- }
- // Consider all files served by #c as character device files.
- if d.Type == 'c' {
- fs.mode |= ModeCharDevice
- }
- return fs
- }
- // arg is an open *File or a path string.
- func dirstat(arg any) (*syscall.Dir, error) {
- var name string
- var err error
- size := syscall.STATFIXLEN + 16*4
- for i := 0; i < 2; i++ {
- buf := make([]byte, bitSize16+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 < bitSize16 {
- return nil, &PathError{Op: "stat", Path: name, Err: 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{Op: "stat", Path: name, Err: err}
- }
- return d, nil
- }
- }
- if err == nil {
- err = syscall.ErrBadStat
- }
- return nil, &PathError{Op: "stat", Path: name, Err: err}
- }
- // statNolog implements Stat for Plan 9.
- func statNolog(name string) (FileInfo, error) {
- d, err := dirstat(name)
- if err != nil {
- return nil, err
- }
- return fileInfoFromStat(d), nil
- }
- // lstatNolog implements Lstat for Plan 9.
- func lstatNolog(name string) (FileInfo, error) {
- return statNolog(name)
- }
- // For testing.
- func atime(fi FileInfo) time.Time {
- return time.Unix(int64(fi.Sys().(*syscall.Dir).Atime), 0)
- }
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