Native utils for working with user and app IDs.

/*

 * 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 */

	threads.c \

	sched_policy.c \

	iosched_policy.c \

	str_parms.c

	str_parms.c \

	multiuser.c

commonHostSources := \

        ashmem-host.c

/*

 * 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.

 */

#include <stdlib.h>

#include <unistd.h>

#include <fcntl.h>

#include <cutils/multiuser.h>

userid_t getUserId(uid_t uid) {

    return uid / MULTIUSER_APP_PER_USER_RANGE;

}

appid_t getAppId(uid_t uid) {

    return uid % MULTIUSER_APP_PER_USER_RANGE;

}

uid_t getUid(userid_t userId, appid_t appId) {

    return userId * MULTIUSER_APP_PER_USER_RANGE + (appId % MULTIUSER_APP_PER_USER_RANGE);

}