Add a feature to return the directories and files that are being monitored

inotify.go

@@ -162,6 +162,20 @@ func (w *Watcher) Remove(name string) error {
 	return nil
 }
 
+// WatchList returns the directories and files that are being monitered.
+func (w *Watcher) WatchList() []string {
+	var dirs []string
+
+	w.mu.Lock()
+	defer w.mu.Unlock()
+
+	for key := range w.watches {
+		dirs = append(dirs, key)
+	}
+
+	return dirs
+}
+
 type watch struct {
 	wd    uint32 // Watch descriptor (as returned by the inotify_add_watch() syscall)
 	flags uint32 // inotify flags of this watch (see inotify(7) for the list of valid flags)

inotify_test.go

@@ -453,3 +453,40 @@ func TestInotifyOverflow(t *testing.T) {
 			numDirs*numFiles, creates)
 	}
 }
+
+func TestInotifyWatchList(t *testing.T) {
+	testDir := tempMkdir(t)
+	defer os.RemoveAll(testDir)
+	testFile := filepath.Join(testDir, "testfile")
+
+	handle, err := os.Create(testFile)
+	if err != nil {
+		t.Fatalf("Create failed: %v", err)
+	}
+	handle.Close()
+
+	w, err := NewWatcher()
+	if err != nil {
+		t.Fatalf("Failed to create watcher: %v", err)
+	}
+	defer w.Close()
+
+	err = w.Add(testFile)
+	if err != nil {
+		t.Fatalf("Failed to add testFile: %v", err)
+	}
+	err = w.Add(testDir)
+	if err != nil {
+		t.Fatalf("Failed to add testDir: %v", err)
+	}
+
+	value := w.WatchList()
+
+	w.mu.Lock()
+	defer w.mu.Unlock()
+	for _, entry := range value {
+		if _, ok := w.watches[entry]; !ok {
+			t.Fatal("return value of WatchList is not same as the expected")
+		}
+	}
+}