2009-02-08 11:18:50 -07:00
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package os
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import (
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"syscall";
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"os";
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"unsafe";
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)
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// Negative count means read until EOF.
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func Readdirnames(fd *FD, count int) (names []string, err *os.Error) {
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// Getdirentries needs the file offset - it's too hard for the kernel to remember
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// a number it already has written down.
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base, err1 := syscall.Seek(fd.fd, 0, 1);
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if err1 != 0 {
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return nil, os.ErrnoToError(err1)
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}
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// The buffer must be at least a block long.
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// TODO(r): use fstatfs to find fs block size.
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var buf = make([]byte, 8192);
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names = make([]string, 0, 100); // TODO: could be smarter about size
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for {
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if count == 0 {
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break
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}
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2009-02-09 11:20:15 -07:00
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ret, err2 := syscall.Getdirentries(fd.fd, &buf[0], int64(len(buf)), &base);
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2009-02-08 11:18:50 -07:00
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if ret < 0 || err2 != 0 {
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return names, os.ErrnoToError(err2)
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}
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if ret == 0 {
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break
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}
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for w, i := uintptr(0),uintptr(0); i < uintptr(ret); i += w {
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if count == 0 {
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break
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}
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2009-02-09 12:24:35 -07:00
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dirent := unsafe.Pointer((uintptr(unsafe.Pointer(&buf[0])) + i)).(*syscall.Dirent);
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w = uintptr(dirent.Reclen);
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if dirent.Ino == 0 {
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2009-02-08 11:18:50 -07:00
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continue
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}
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count--;
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if len(names) == cap(names) {
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nnames := make([]string, len(names), 2*len(names));
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for i := 0; i < len(names); i++ {
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nnames[i] = names[i]
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}
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names = nnames;
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}
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names = names[0:len(names)+1];
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2009-02-09 12:24:35 -07:00
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names[len(names)-1] = string(dirent.Name[0:dirent.Namlen]);
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2009-02-08 11:18:50 -07:00
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}
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}
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return names, nil;
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}
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2009-02-09 12:24:35 -07:00
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// TODO(r): see comment in dir_amd64_linux.go
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// Negative count means read until EOF.
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func Readdir(fd *FD, count int) (dirs []Dir, err *os.Error) {
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dirname := fd.name;
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if dirname == "" {
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dirname = ".";
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}
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dirname += "/";
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// Getdirentries needs the file offset - it's too hard for the kernel to remember
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// a number it already has written down.
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base, err1 := syscall.Seek(fd.fd, 0, 1);
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if err1 != 0 {
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return nil, os.ErrnoToError(err1)
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}
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// The buffer must be at least a block long.
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// TODO(r): use fstatfs to find fs block size.
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var buf = make([]byte, 8192);
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dirs = make([]Dir, 0, 100); // TODO: could be smarter about size
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for {
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if count == 0 {
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break
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}
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ret, err2 := syscall.Getdirentries(fd.fd, &buf[0], int64(len(buf)), &base);
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if ret < 0 || err2 != 0 {
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return dirs, os.ErrnoToError(err2)
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}
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if ret == 0 {
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break
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}
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for w, i := uintptr(0),uintptr(0); i < uintptr(ret); i += w {
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if count == 0 {
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break
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}
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dirent := unsafe.Pointer((uintptr(unsafe.Pointer(&buf[0])) + i)).(*syscall.Dirent);
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w = uintptr(dirent.Reclen);
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if dirent.Ino == 0 {
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continue
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}
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count--;
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if len(dirs) == cap(dirs) {
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ndirs := make([]Dir, len(dirs), 2*len(dirs));
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for i := 0; i < len(dirs); i++ {
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ndirs[i] = dirs[i]
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}
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dirs = ndirs;
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}
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dirs = dirs[0:len(dirs)+1];
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filename := string(dirent.Name[0:dirent.Namlen]);
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dirp, err := Stat(dirname + filename);
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if dir == nil || err != nil {
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dirs[len(dirs)-1].Name = filename; // rest will be zeroed out
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} else {
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dirs[len(dirs)-1] = *dirp;
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}
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}
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}
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return dirs, nil;
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}
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