// 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" func fileInfoFromStat(fi *FileInfo, d *Dir) *FileInfo { fi.Dev = uint64(d.Qid.Vers) | uint64(d.Qid.Type<<32) fi.Ino = d.Qid.Path fi.Mode = uint32(d.Mode) & 0777 if (d.Mode & syscall.DMDIR) == syscall.DMDIR { fi.Mode |= syscall.S_IFDIR } else { fi.Mode |= syscall.S_IFREG } fi.Size = int64(d.Length) fi.Atime_ns = 1e9 * int64(d.Atime) fi.Mtime_ns = 1e9 * int64(d.Mtime) fi.Name = d.Name fi.FollowedSymlink = false return fi } // arg is an open *File or a path string. func dirstat(arg interface{}) (d *Dir, err Error) { var name string nd := syscall.STATFIXLEN + 16*4 for i := 0; i < 2; i++ { /* should work by the second try */ buf := make([]byte, nd) var n int var e syscall.Error switch syscallArg := arg.(type) { case *File: name = syscallArg.name n, e = syscall.Fstat(syscallArg.fd, buf) case string: name = syscallArg n, e = syscall.Stat(name, buf) } if e != nil { return nil, &PathError{"stat", name, e} } if n < syscall.STATFIXLEN { return nil, &PathError{"stat", name, Eshortstat} } ntmp, _ := gbit16(buf) nd = int(ntmp) if nd <= n { d, e := UnmarshalDir(buf[:n]) if e != nil { return nil, &PathError{"stat", name, e} } return d, e } } return nil, &PathError{"stat", name, Ebadstat} } // Stat returns a FileInfo structure describing the named file and an error, if any. func Stat(name string) (fi *FileInfo, err Error) { d, err := dirstat(name) if iserror(err) { return nil, err } return fileInfoFromStat(new(FileInfo), d), err } // Lstat returns the FileInfo structure describing the named file and an // error, if any. If the file is a symbolic link (though Plan 9 does not have symbolic links), // the returned FileInfo describes the symbolic link. Lstat makes no attempt to follow the link. func Lstat(name string) (fi *FileInfo, err Error) { d, err := dirstat(name) if iserror(err) { return nil, err } return fileInfoFromStat(new(FileInfo), d), err }