Add communication support for xt_qtaguid(network traffic accounting) kernel module.

/*

 * Copyright (C) 2011 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_QTAGUID_H

#define __CUTILS_QTAGUID_H

#include <stdint.h>

#include <sys/types.h>

#ifdef __cplusplus

extern "C" {

#endif

/*

 * Set tags (and owning UIDs) for network sockets.

*/

extern int set_qtaguid(int sockfd, int tag, uid_t uid);

#ifdef __cplusplus

}

#endif

#endif /* __CUTILS_QTAG_UID_H */

	threads.c \

	sched_policy.c \

	iosched_policy.c \

	str_parms.c

	str_parms.c \

	qtaguid.c

commonHostSources := \

        ashmem-host.c

/* libcutils/qtaguid.c

**

** Copyright 2011, 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.

*/

#define LOG_TAG "qtaguid"

#include <cutils/qtaguid.h>

#include <cutils/log.h>

#include <fcntl.h>

#include <stdio.h>

#include <string.h>

#include <unistd.h>

extern int set_qtaguid(int sockfd, int tag, uid_t uid) {

    char lineBuf[128];

    int fd, cnt = 0;

    uint64_t kTag = (uint64_t)tag << 32;

    snprintf(lineBuf, sizeof(lineBuf), "t %d %llu %d", sockfd, kTag, uid);

    LOGV("Tagging Socket with command %s\n", lineBuf);

    /* TODO: Enable after the kernel module is fixed.

       fd = open("/proc/net/xt_qtaguid/ctrl", O_WRONLY);

       if (fd < 0) {

           return -1;

       }

       cnt = write(fd, lineBuf, strlen(lineBuf));

       close(fd);

    */

    return (cnt>0?0:-1);

}