113 lines
2.9 KiB
C++
Executable File
113 lines
2.9 KiB
C++
Executable File
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <sys/socket.h>
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#include <sys/select.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/un.h>
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#include <linux/netlink.h>
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#define LOG_TAG "Vold"
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#include <cutils/log.h>
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#include "NetlinkManager.h"
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#include "NetlinkHandler.h"
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NetlinkManager *NetlinkManager::sInstance = NULL;
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NetlinkManager *NetlinkManager::Instance() {
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if (!sInstance)
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sInstance = new NetlinkManager();
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return sInstance;
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}
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NetlinkManager::NetlinkManager() {
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mBroadcaster = NULL;
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}
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NetlinkManager::~NetlinkManager() {
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}
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int NetlinkManager::start() {
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struct sockaddr_nl nladdr;
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int sz = 64 * 1024;
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int on = 1;
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memset(&nladdr, 0, sizeof(nladdr));
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nladdr.nl_family = AF_NETLINK;
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nladdr.nl_pid = getpid();/* 为接收或发送消息的进程的 ID，如果希望内核处理消息为多播消息，
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* 就把该字段设置为 0，否则设置为处理消息的进程 ID；
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*/
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nladdr.nl_groups = 0xffffffff;/* 用于指定多播组，bind 函数用于把调用进程加入到该字段指定
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* 的多播组，如果设置为 0，表示调用者不加入任何多播组。
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*/
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if ((mSock = socket(PF_NETLINK,
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SOCK_DGRAM,NETLINK_KOBJECT_UEVENT)) < 0) {
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SLOGE("Unable to create uevent socket: %s", strerror(errno));
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return -1;
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}
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if (setsockopt(mSock, SOL_SOCKET, SO_RCVBUFFORCE, &sz, sizeof(sz)) < 0) {
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SLOGE("Unable to set uevent socket SO_RCVBUFFORCE option: %s", strerror(errno));
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goto out;
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}
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if (setsockopt(mSock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)) < 0) {
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SLOGE("Unable to set uevent socket SO_PASSCRED option: %s", strerror(errno));
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goto out;
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}
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if (bind(mSock, (struct sockaddr *) &nladdr, sizeof(nladdr)) < 0) {
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SLOGE("Unable to bind uevent socket: %s", strerror(errno));
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goto out;
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}
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mHandler = new NetlinkHandler(mSock);
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if (mHandler->start()) {
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SLOGE("Unable to start NetlinkHandler: %s", strerror(errno));
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goto out;
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}
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return 0;
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out:
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close(mSock);
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return -1;
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}
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int NetlinkManager::stop() {
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int status = 0;
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if (mHandler->stop()) {
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SLOGE("Unable to stop NetlinkHandler: %s", strerror(errno));
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status = -1;
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}
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delete mHandler;
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mHandler = NULL;
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close(mSock);
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mSock = -1;
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return status;
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}
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