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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
if err := a.incref("fstat"); err != nil {
return nil, err
}
n, err = syscall.Fstat(a.fd, buf)
a.decref()
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)
}