1 /* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <cutils/multiuser.h> 18 #include <private/android_filesystem_config.h> 19 20 userid_t multiuser_get_user_id(uid_t uid) { 21 return uid / AID_USER_OFFSET; 22 } 23 24 appid_t multiuser_get_app_id(uid_t uid) { 25 return uid % AID_USER_OFFSET; 26 } 27 28 uid_t multiuser_get_uid(userid_t user_id, appid_t app_id) { 29 return (user_id * AID_USER_OFFSET) + (app_id % AID_USER_OFFSET); 30 } 31 32 gid_t multiuser_get_cache_gid(userid_t user_id, appid_t app_id) { 33 if (app_id >= AID_APP_START && app_id <= AID_APP_END) { 34 return multiuser_get_uid(user_id, (app_id - AID_APP_START) + AID_CACHE_GID_START); 35 } else { 36 return -1; 37 } 38 } 39 40 gid_t multiuser_get_ext_gid(userid_t user_id, appid_t app_id) { 41 if (app_id >= AID_APP_START && app_id <= AID_APP_END) { 42 return multiuser_get_uid(user_id, (app_id - AID_APP_START) + AID_EXT_GID_START); 43 } else { 44 return -1; 45 } 46 } 47 48 gid_t multiuser_get_ext_cache_gid(userid_t user_id, appid_t app_id) { 49 if (app_id >= AID_APP_START && app_id <= AID_APP_END) { 50 return multiuser_get_uid(user_id, (app_id - AID_APP_START) + AID_EXT_CACHE_GID_START); 51 } else { 52 return -1; 53 } 54 } 55 56 gid_t multiuser_get_shared_gid(userid_t, appid_t app_id) { 57 if (app_id >= AID_APP_START && app_id <= AID_APP_END) { 58 return (app_id - AID_APP_START) + AID_SHARED_GID_START; 59 } else if (app_id >= AID_ROOT && app_id <= AID_APP_START) { 60 return app_id; 61 } else { 62 return -1; 63 } 64 } 65 66 gid_t multiuser_get_shared_app_gid(uid_t uid) { 67 return multiuser_get_shared_gid(multiuser_get_user_id(uid), multiuser_get_app_id(uid)); 68 } 69
