1 // Copyright 2018 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
23 func TestDirent(t *testing.T) {
25 direntBufSize = 2048 // arbitrary? See https://go.dev/issue/37323.
30 t.Logf("tmpdir: %s", d)
32 for i, c := range []byte("0123456789") {
33 name := string(bytes.Repeat([]byte{c}, filenameMinSize+i))
34 err := os.WriteFile(filepath.Join(d, name), nil, 0644)
36 t.Fatalf("writefile: %v", err)
40 names := make([]string, 0, 10)
42 fd, err := syscall.Open(d, syscall.O_RDONLY, 0)
44 t.Fatalf("syscall.open: %v", err)
46 defer syscall.Close(fd)
48 buf := bytes.Repeat([]byte{0xCD}, direntBufSize)
50 n, err := syscall.ReadDirent(fd, buf)
51 if err == syscall.EINVAL {
52 // On linux, 'man getdents64' says that EINVAL indicates “result buffer is too small”.
53 // Try a bigger buffer.
54 t.Logf("ReadDirent: %v; retrying with larger buffer", err)
55 buf = bytes.Repeat([]byte{0xCD}, len(buf)*2)
59 t.Fatalf("syscall.readdir: %v", err)
61 t.Logf("ReadDirent: read %d bytes", n)
66 var consumed, count int
67 consumed, count, names = syscall.ParseDirent(buf[:n], -1, names)
68 t.Logf("ParseDirent: %d new name(s)", count)
70 t.Fatalf("ParseDirent: consumed %d bytes; expected %d", consumed, n)
75 t.Logf("names: %q", names)
78 t.Errorf("got %d names; expected 10", len(names))
80 for i, name := range names {
81 ord, err := strconv.Atoi(name[:1])
83 t.Fatalf("names[%d] is non-integer %q: %v", i, names[i], err)
85 if expected := strings.Repeat(name[:1], filenameMinSize+ord); name != expected {
86 t.Errorf("names[%d] is %q (len %d); expected %q (len %d)", i, name, len(name), expected, len(expected))
91 func TestDirentRepeat(t *testing.T) {
93 // Note: the size of the buffer is small enough that the loop
94 // below will need to execute multiple times. See issue #31368.
95 size := N * unsafe.Offsetof(syscall.Dirent{}.Name) / 4
96 if runtime.GOOS == "freebsd" || runtime.GOOS == "netbsd" {
98 size = 1024 // DIRBLKSIZ, see issue 31403.
102 // Make a directory containing N files
106 for i := 0; i < N; i++ {
107 files = append(files, fmt.Sprintf("file%d", i))
109 for _, file := range files {
110 err := os.WriteFile(filepath.Join(d, file), []byte("contents"), 0644)
112 t.Fatalf("writefile: %v", err)
116 // Read the directory entries using ReadDirent.
117 fd, err := syscall.Open(d, syscall.O_RDONLY, 0)
119 t.Fatalf("syscall.open: %v", err)
121 defer syscall.Close(fd)
124 buf := make([]byte, size)
125 n, err := syscall.ReadDirent(fd, buf)
127 t.Fatalf("syscall.readdir: %v", err)
135 consumed, _, files2 = syscall.ParseDirent(buf, -1, files2)
143 if strings.Join(files, "|") != strings.Join(files2, "|") {
144 t.Errorf("bad file list: want\n%q\ngot\n%q", files, files2)