Current File : //usr/local/go119/src/syscall/getdirentries_test.go
// Copyright 2019 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 darwin || freebsd || netbsd || openbsd
package syscall_test
import (
"fmt"
"os"
"path/filepath"
"sort"
"strings"
"syscall"
"testing"
"unsafe"
)
func TestGetdirentries(t *testing.T) {
for _, count := range []int{10, 1000} {
t.Run(fmt.Sprintf("n=%d", count), func(t *testing.T) {
testGetdirentries(t, count)
})
}
}
func testGetdirentries(t *testing.T, count int) {
if count > 100 && testing.Short() && os.Getenv("GO_BUILDER_NAME") == "" {
t.Skip("skipping in -short mode")
}
d := t.TempDir()
var names []string
for i := 0; i < count; i++ {
names = append(names, fmt.Sprintf("file%03d", i))
}
// Make files in the temp directory
for _, name := range names {
err := os.WriteFile(filepath.Join(d, name), []byte("data"), 0)
if err != nil {
t.Fatalf("WriteFile: %v", err)
}
}
// Read files using Getdirentries
var names2 []string
fd, err := syscall.Open(d, syscall.O_RDONLY, 0)
if err != nil {
t.Fatalf("Open: %v", err)
}
defer syscall.Close(fd)
var base uintptr
var buf [2048]byte
for {
n, err := syscall.Getdirentries(fd, buf[:], &base)
if err != nil {
t.Fatalf("Getdirentries: %v", err)
}
if n == 0 {
break
}
data := buf[:n]
for len(data) > 0 {
// If multiple Dirents are written into buf, sometimes when we reach the final one,
// we have cap(buf) < Sizeof(Dirent). So use an appropriate slice to copy from data.
var dirent syscall.Dirent
copy((*[unsafe.Sizeof(dirent)]byte)(unsafe.Pointer(&dirent))[:], data)
data = data[dirent.Reclen:]
name := make([]byte, dirent.Namlen)
for i := 0; i < int(dirent.Namlen); i++ {
name[i] = byte(dirent.Name[i])
}
names2 = append(names2, string(name))
}
}
names = append(names, ".", "..") // Getdirentries returns these also
sort.Strings(names)
sort.Strings(names2)
if strings.Join(names, ":") != strings.Join(names2, ":") {
t.Errorf("names don't match\n names: %q\nnames2: %q", names, names2)
}
}
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