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Source file src/syscall/syscall_freebsd_test.go

Documentation: syscall

     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  }
    55  

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