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NetlinkManager.cpp

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/*

* Copyright (C) 2008 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 <stdio.h>

#include <errno.h>

#include <sys/socket.h>

#include <sys/select.h>

#include <sys/time.h>

#include <sys/types.h>

#include <sys/un.h>

#include <linux/netlink.h>

#define LOG_TAG "Vold"

#include <cutils/log.h>

#include "NetlinkManager.h"

#include "NetlinkHandler.h"

NetlinkManager *NetlinkManager::sInstance = NULL;

NetlinkManager *NetlinkManager::Instance() {

if (!sInstance)

sInstance = new NetlinkManager();

return sInstance;

}

NetlinkManager::NetlinkManager() {

mBroadcaster = NULL;

}

NetlinkManager::~NetlinkManager() {

}

int NetlinkManager::start() {

struct sockaddr_nl nladdr;

int sz = 64 * 1024;

int on = 1;

memset(&nladdr, 0, sizeof(nladdr));

nladdr.nl_family = AF_NETLINK;

nladdr.nl_pid = getpid();

nladdr.nl_groups = 0xffffffff;

if ((mSock = socket(PF_NETLINK,

SOCK_DGRAM,NETLINK_KOBJECT_UEVENT)) < 0) {

SLOGE("Unable to create uevent socket: %s", strerror(errno));

return -1;

}

if (setsockopt(mSock, SOL_SOCKET, SO_RCVBUFFORCE, &sz, sizeof(sz)) < 0) {

SLOGE("Unable to set uevent socket SO_RECBUFFORCE option: %s", strerror(errno));

return -1;

}

if (setsockopt(mSock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)) < 0) {

SLOGE("Unable to set uevent socket SO_PASSCRED option: %s", strerror(errno));

return -1;

}

if (bind(mSock, (struct sockaddr *) &nladdr, sizeof(nladdr)) < 0) {

SLOGE("Unable to bind uevent socket: %s", strerror(errno));

return -1;

}

mHandler = new NetlinkHandler(mSock);

if (mHandler->start()) {

SLOGE("Unable to start NetlinkHandler: %s", strerror(errno));

return -1;

}

return 0;

}

int NetlinkManager::stop() {

if (mHandler->stop()) {

SLOGE("Unable to stop NetlinkHandler: %s", strerror(errno));

return -1;

}

delete mHandler;

mHandler = NULL;

close(mSock);

mSock = -1;

return 0;

}