unix: add test for Getdirentries
Copied and adapted from the respective test in std syscall.
Change-Id: Ia35864e201c8b628dfc21a8da79305d5741d4acc
Reviewed-on: https://go-review.googlesource.com/c/sys/+/183219
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Yuval Pavel Zholkover <paulzhol@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
diff --git a/unix/getdirentries_test.go b/unix/getdirentries_test.go
new file mode 100644
index 0000000..16250bd
--- /dev/null
+++ b/unix/getdirentries_test.go
@@ -0,0 +1,86 @@
+// 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.
+
+// +build darwin dragonfly
+
+package unix_test
+
+import (
+ "fmt"
+ "io/ioutil"
+ "os"
+ "path/filepath"
+ "sort"
+ "strings"
+ "testing"
+ "unsafe"
+
+ "golang.org/x/sys/unix"
+)
+
+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, err := ioutil.TempDir("", "getdirentries-test")
+ if err != nil {
+ t.Fatalf("Tempdir: %v", err)
+ }
+ defer os.RemoveAll(d)
+ 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 := ioutil.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 := unix.Open(d, unix.O_RDONLY, 0)
+ if err != nil {
+ t.Fatalf("Open: %v", err)
+ }
+ defer unix.Close(fd)
+ var base uintptr
+ var buf [2048]byte
+ for {
+ n, err := unix.Getdirentries(fd, buf[:], &base)
+ if err != nil {
+ t.Fatalf("Getdirentries: %v", err)
+ }
+ if n == 0 {
+ break
+ }
+ data := buf[:n]
+ for len(data) > 0 {
+ dirent := (*unix.Dirent)(unsafe.Pointer(&data[0]))
+ 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)
+ }
+}
