| // Copyright 2018 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. |
| |
| //go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris |
| |
| package syscall_test |
| |
| import ( |
| "bytes" |
| "fmt" |
| "os" |
| "path/filepath" |
| "runtime" |
| "sort" |
| "strconv" |
| "strings" |
| "syscall" |
| "testing" |
| "unsafe" |
| ) |
| |
| func TestDirent(t *testing.T) { |
| const ( |
| direntBufSize = 2048 |
| filenameMinSize = 11 |
| ) |
| |
| d := t.TempDir() |
| t.Logf("tmpdir: %s", d) |
| |
| for i, c := range []byte("0123456789") { |
| name := string(bytes.Repeat([]byte{c}, filenameMinSize+i)) |
| err := os.WriteFile(filepath.Join(d, name), nil, 0644) |
| if err != nil { |
| t.Fatalf("writefile: %v", err) |
| } |
| } |
| |
| buf := bytes.Repeat([]byte("DEADBEAF"), direntBufSize/8) |
| fd, err := syscall.Open(d, syscall.O_RDONLY, 0) |
| if err != nil { |
| t.Fatalf("syscall.open: %v", err) |
| } |
| defer syscall.Close(fd) |
| n, err := syscall.ReadDirent(fd, buf) |
| if err != nil { |
| t.Fatalf("syscall.readdir: %v", err) |
| } |
| buf = buf[:n] |
| |
| names := make([]string, 0, 10) |
| for len(buf) > 0 { |
| var bc int |
| bc, _, names = syscall.ParseDirent(buf, -1, names) |
| buf = buf[bc:] |
| } |
| |
| sort.Strings(names) |
| t.Logf("names: %q", names) |
| |
| if len(names) != 10 { |
| t.Errorf("got %d names; expected 10", len(names)) |
| } |
| for i, name := range names { |
| ord, err := strconv.Atoi(name[:1]) |
| if err != nil { |
| t.Fatalf("names[%d] is non-integer %q: %v", i, names[i], err) |
| } |
| if expected := string(strings.Repeat(name[:1], filenameMinSize+ord)); name != expected { |
| t.Errorf("names[%d] is %q (len %d); expected %q (len %d)", i, name, len(name), expected, len(expected)) |
| } |
| } |
| } |
| |
| func TestDirentRepeat(t *testing.T) { |
| const N = 100 |
| // Note: the size of the buffer is small enough that the loop |
| // below will need to execute multiple times. See issue #31368. |
| size := N * unsafe.Offsetof(syscall.Dirent{}.Name) / 4 |
| if runtime.GOOS == "freebsd" || runtime.GOOS == "netbsd" { |
| if size < 1024 { |
| size = 1024 // DIRBLKSIZ, see issue 31403. |
| } |
| if runtime.GOOS == "freebsd" { |
| t.Skip("need to fix issue 31416 first") |
| } |
| } |
| |
| // Make a directory containing N files |
| d := t.TempDir() |
| |
| var files []string |
| for i := 0; i < N; i++ { |
| files = append(files, fmt.Sprintf("file%d", i)) |
| } |
| for _, file := range files { |
| err := os.WriteFile(filepath.Join(d, file), []byte("contents"), 0644) |
| if err != nil { |
| t.Fatalf("writefile: %v", err) |
| } |
| } |
| |
| // Read the directory entries using ReadDirent. |
| fd, err := syscall.Open(d, syscall.O_RDONLY, 0) |
| if err != nil { |
| t.Fatalf("syscall.open: %v", err) |
| } |
| defer syscall.Close(fd) |
| var files2 []string |
| for { |
| buf := make([]byte, size) |
| n, err := syscall.ReadDirent(fd, buf) |
| if err != nil { |
| t.Fatalf("syscall.readdir: %v", err) |
| } |
| if n == 0 { |
| break |
| } |
| buf = buf[:n] |
| for len(buf) > 0 { |
| var consumed int |
| consumed, _, files2 = syscall.ParseDirent(buf, -1, files2) |
| buf = buf[consumed:] |
| } |
| } |
| |
| // Check results |
| sort.Strings(files) |
| sort.Strings(files2) |
| if strings.Join(files, "|") != strings.Join(files2, "|") { |
| t.Errorf("bad file list: want\n%q\ngot\n%q", files, files2) |
| } |
| } |