1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
|
// Copyright 2009 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.
// This file was derived from src/os/dir_darwin.go since the logic for WASI is
// fairly similar: we use fdopendir, fdclosedir, and readdir from wasi-libc in
// a similar way that the darwin code uses functions from libc.
//go:build wasip1 || wasip2
package os
import (
"io"
"runtime"
"syscall"
"unsafe"
)
// opaque DIR* returned by fdopendir
//
// We add an unused field so it is not the empty struct, which is usually
// a special case in Go.
type dirInfo struct{ _ int32 }
func (d *dirInfo) close() {
syscall.Fdclosedir(uintptr(unsafe.Pointer(d)))
}
func (f *File) readdir(n int, mode readdirMode) (names []string, dirents []DirEntry, infos []FileInfo, err error) {
if f.dirinfo == nil {
dir, errno := syscall.Fdopendir(syscallFd(f.handle.(unixFileHandle)))
if errno != nil {
return nil, nil, nil, &PathError{Op: "fdopendir", Path: f.name, Err: errno}
}
f.dirinfo = (*dirInfo)(unsafe.Pointer(dir))
}
d := uintptr(unsafe.Pointer(f.dirinfo))
// see src/os/dir_unix.go
if n == 0 {
n = -1
}
for n != 0 {
dirent, errno := syscall.Readdir(d)
if errno != nil {
if errno == syscall.EINTR {
continue
}
return names, dirents, infos, &PathError{Op: "readdir", Path: f.name, Err: errno}
}
if dirent == nil { // EOF
break
}
name := dirent.Name()
// Check for useless names before allocating a string.
if string(name) == "." || string(name) == ".." {
continue
}
if n > 0 {
n--
}
if mode == readdirName {
names = append(names, string(name))
} else if mode == readdirDirEntry {
de, err := newUnixDirent(f.name, string(name), dtToType(dirent.Type))
if IsNotExist(err) {
// File disappeared between readdir and stat.
// Treat as if it didn't exist.
continue
}
if err != nil {
return nil, dirents, nil, err
}
dirents = append(dirents, de)
} else {
info, err := lstat(f.name + "/" + string(name))
if IsNotExist(err) {
// File disappeared between readdir + stat.
// Treat as if it didn't exist.
continue
}
if err != nil {
return nil, nil, infos, err
}
infos = append(infos, info)
}
runtime.KeepAlive(f)
}
if n > 0 && len(names)+len(dirents)+len(infos) == 0 {
return nil, nil, nil, io.EOF
}
return names, dirents, infos, nil
}
func dtToType(typ uint8) FileMode {
switch typ {
case syscall.DT_BLK:
return ModeDevice
case syscall.DT_CHR:
return ModeDevice | ModeCharDevice
case syscall.DT_DIR:
return ModeDir
case syscall.DT_FIFO:
return ModeNamedPipe
case syscall.DT_LNK:
return ModeSymlink
case syscall.DT_REG:
return 0
}
return ^FileMode(0)
}
|
