144 lines
3.2 KiB
Go
144 lines
3.2 KiB
Go
// 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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"internal/poll"
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"io"
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"syscall"
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"unsafe"
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)
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// FIXME: pathconf returns long, not int.
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//extern pathconf
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func libc_pathconf(*byte, int32) int
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func direntType(*syscall.Dirent) byte
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func clen(n []byte) int {
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for i := 0; i < len(n); i++ {
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if n[i] == 0 {
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return i
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}
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}
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return len(n)
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}
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func (f *File) readdir(n int, mode readdirMode) (names []string, dirents []DirEntry, infos []FileInfo, err error) {
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// If this file has no dirinfo, create one.
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if f.dirinfo == nil {
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fd, call, err := poll.DupCloseOnExec(int(f.pfd.Sysfd))
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if err != nil {
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return nil, nil, nil, NewSyscallError(call, err)
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}
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syscall.Entersyscall()
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r := libc_fdopendir(int32(fd))
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errno := syscall.GetErrno()
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syscall.Exitsyscall()
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if r == nil {
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return nil, nil, nil, &PathError{"fdopendir", f.name, errno}
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}
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f.dirinfo = &dirInfo{r}
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}
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dir := f.dirinfo.dir
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// Change the meaning of n for the implementation below.
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//
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// The n above was for the public interface of "if n <= 0,
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// Readdir returns all the FileInfo from the directory in a
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// single slice".
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//
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// But below, we use only negative to mean looping until the
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// end and positive to mean bounded, with positive
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// terminating at 0.
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if n == 0 {
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n = -1
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}
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for n != 0 {
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syscall.Entersyscall()
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syscall.SetErrno(0)
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dirent := libc_readdir(dir)
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errno := syscall.GetErrno()
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syscall.Exitsyscall()
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if dirent == nil {
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if errno != 0 {
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return names, dirents, infos, &PathError{Op: "readdir", Path: f.name, Err: errno}
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}
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break // EOF
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}
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// In some cases the actual name can be longer than
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// the Name field.
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name := (*[1 << 16]byte)(unsafe.Pointer(&dirent.Name[0]))[:]
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for i, c := range name {
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if c == 0 {
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name = name[:i]
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break
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}
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}
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// Check for useless names before allocating a string.
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if (len(name) == 1 && name[0] == '.') || (len(name) == 2 && name[0] == '.' && name[1] == '.') {
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continue
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}
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if n > 0 { // see 'n == 0' comment above
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n--
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}
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if mode == readdirName {
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names = append(names, string(name))
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} else if mode == readdirDirEntry {
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var typ FileMode
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switch direntType(dirent) {
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case 'B':
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typ = ModeDevice
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case 'C':
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typ = ModeDevice | ModeCharDevice
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case 'D':
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typ = ModeDir
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case 'F':
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typ = ModeNamedPipe
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case 'L':
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typ = ModeSymlink
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case 'R':
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typ = 0
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case 'S':
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typ = ModeSocket
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case 'U':
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typ = ^FileMode(0)
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}
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de, err := newUnixDirent(f.name, string(name), typ)
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if IsNotExist(err) {
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// File disappeared between readdir and stat.
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// Treat as if it didn't exist.
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continue
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}
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if err != nil {
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return nil, dirents, nil, err
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}
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dirents = append(dirents, de)
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} else {
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info, err := lstat(f.name + "/" + string(name))
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if IsNotExist(err) {
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// File disappeared between readdir + stat.
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// Treat as if it didn't exist.
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continue
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}
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if err != nil {
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return nil, nil, infos, err
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}
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infos = append(infos, info)
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}
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}
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if n > 0 && len(names)+len(dirents)+len(infos) == 0 {
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return nil, nil, nil, io.EOF
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}
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return names, dirents, infos, nil
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}
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