diff --git a/include/cutils/multiuser.h b/include/cutils/multiuser.h
new file mode 100644
index 0000000..191d80c
--- /dev/null
+++ b/include/cutils/multiuser.h
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __CUTILS_MULTIUSER_H
+#define __CUTILS_MULTIUSER_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// NOTE: keep in sync with android.os.UserId
+
+#define MULTIUSER_APP_PER_USER_RANGE 100000
+
+typedef uid_t userid_t;
+typedef uid_t appid_t;
+
+extern userid_t getUserId(uid_t uid);
+extern appid_t getAppId(uid_t uid);
+extern uid_t getUid(userid_t userId, appid_t appId);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __CUTILS_MULTIUSER_H */