getdirentries_test.go

Documentation: golang.org/x/sys/unix

     1  // Copyright 2019 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  //go:build darwin || dragonfly || freebsd || openbsd || netbsd || zos
     6  
     7  package unix_test
     8  
     9  import (
    10  	"fmt"
    11  	"os"
    12  	"path/filepath"
    13  	"sort"
    14  	"strings"
    15  	"testing"
    16  
    17  	"golang.org/x/sys/unix"
    18  )
    19  
    20  func TestGetdirentries(t *testing.T) {
    21  	for _, count := range []int{10, 1000} {
    22  		t.Run(fmt.Sprintf("n=%d", count), func(t *testing.T) {
    23  			testGetdirentries(t, count)
    24  		})
    25  	}
    26  }
    27  func testGetdirentries(t *testing.T, count int) {
    28  	if count > 100 && testing.Short() && os.Getenv("GO_BUILDER_NAME") == "" {
    29  		t.Skip("skipping in -short mode")
    30  	}
    31  	d := t.TempDir()
    32  
    33  	var names []string
    34  	for i := 0; i < count; i++ {
    35  		names = append(names, fmt.Sprintf("file%03d", i))
    36  	}
    37  
    38  	// Make files in the temp directory
    39  	for _, name := range names {
    40  		err := os.WriteFile(filepath.Join(d, name), []byte("data"), 0)
    41  		if err != nil {
    42  			t.Fatal(err)
    43  		}
    44  	}
    45  
    46  	// Read files using Getdirentries
    47  	fd, err := unix.Open(d, unix.O_RDONLY, 0)
    48  	if err != nil {
    49  		t.Fatalf("Open: %v", err)
    50  	}
    51  	defer unix.Close(fd)
    52  	var base uintptr
    53  	var buf [2048]byte
    54  	names2 := make([]string, 0, count)
    55  	for {
    56  		n, err := unix.Getdirentries(fd, buf[:], &base)
    57  		if err != nil {
    58  			t.Fatalf("Getdirentries: %v", err)
    59  		}
    60  		if n == 0 {
    61  			break
    62  		}
    63  		data := buf[:n]
    64  		for len(data) > 0 {
    65  			var bc int
    66  			bc, _, names2 = unix.ParseDirent(data, -1, names2)
    67  			if bc == 0 && len(data) > 0 {
    68  				t.Fatal("no progress")
    69  			}
    70  			data = data[bc:]
    71  		}
    72  	}
    73  
    74  	sort.Strings(names)
    75  	sort.Strings(names2)
    76  	if strings.Join(names, ":") != strings.Join(names2, ":") {
    77  		t.Errorf("names don't match\n names: %q\nnames2: %q", names, names2)
    78  	}
    79  }
    80
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