libgo/go/syscall/syscall_freebsd_test.go

   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.
   4
   5 // +build freebsd
   6
   7 package syscall_test
   8
   9 import (
  10         "fmt"
  11         "syscall"
  12         "testing"
  13         "unsafe"
  14 )
  15
  16 func TestConvertFromDirent11(t *testing.T) {
  17         const (
  18                 filenameFmt  = "%04d"
  19                 numFiles     = 64
  20                 fixedHdrSize = int(unsafe.Offsetof(syscall.Dirent_freebsd11{}.Name))
  21         )
  22
  23         namlen := len(fmt.Sprintf(filenameFmt, 0))
  24         reclen := syscall.Roundup(fixedHdrSize+namlen+1, 4)
  25         old := make([]byte, numFiles*reclen)
  26         for i := 0; i < numFiles; i++ {
  27                 dent := syscall.Dirent_freebsd11{
  28                         Fileno: uint32(i + 1),
  29                         Reclen: uint16(reclen),
  30                         Type:   syscall.DT_REG,
  31                         Namlen: uint8(namlen),
  32                 }
  33                 rec := make([]byte, reclen)
  34                 copy(rec, (*[fixedHdrSize]byte)(unsafe.Pointer(&dent))[:])
  35                 copy(rec[fixedHdrSize:], fmt.Sprintf(filenameFmt, i+1))
  36                 copy(old[i*reclen:], rec)
  37         }
  38
  39         buf := make([]byte, 2*len(old))
  40         n := syscall.ConvertFromDirents11(buf, old)
  41
  42         names := make([]string, 0, numFiles)
  43         _, _, names = syscall.ParseDirent(buf[:n], -1, names)
  44
  45         if len(names) != numFiles {
  46                 t.Errorf("expected %d files, have %d; names: %q", numFiles, len(names), names)
  47         }
  48
  49         for i, name := range names {
  50                 if expected := fmt.Sprintf(filenameFmt, i+1); name != expected {
  51                         t.Errorf("expected names[%d] to be %q; got %q", i, expected, name)
  52                 }
  53         }
  54 }