1 /* 2 * Copyright (C) 2008 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 #define LOG_TAG "NetlinkListener" 18 19 #include <errno.h> 20 #include <string.h> 21 #include <sys/socket.h> 22 #include <sys/types.h> 23 #include <unistd.h> 24 25 #include <linux/netlink.h> /* out of order because must follow sys/socket.h */ 26 27 #include <cutils/uevent.h> 28 #include <log/log.h> 29 #include <sysutils/NetlinkEvent.h> 30 31 #if 1 32 /* temporary version until we can get Motorola to update their 33 * ril.so. Their prebuilt ril.so is using this private class 34 * so changing the NetlinkListener() constructor breaks their ril. 35 */ 36 NetlinkListener::NetlinkListener(int socket) : 37 SocketListener(socket, false) { 38 mFormat = NETLINK_FORMAT_ASCII; 39 } 40 #endif 41 42 NetlinkListener::NetlinkListener(int socket, int format) : 43 SocketListener(socket, false), mFormat(format) { 44 } 45 46 bool NetlinkListener::onDataAvailable(SocketClient *cli) 47 { 48 int socket = cli->getSocket(); 49 ssize_t count; 50 uid_t uid = -1; 51 52 bool require_group = true; 53 if (mFormat == NETLINK_FORMAT_BINARY_UNICAST) { 54 require_group = false; 55 } 56 57 count = TEMP_FAILURE_RETRY(uevent_kernel_recv(socket, 58 mBuffer, sizeof(mBuffer), require_group, &uid)); 59 if (count < 0) { 60 SLOGE("recvmsg failed (%s)", strerror(errno)); 61 return false; 62 } 63 64 NetlinkEvent *evt = new NetlinkEvent(); 65 if (evt->decode(mBuffer, count, mFormat)) { 66 onEvent(evt); 67 } else if (mFormat != NETLINK_FORMAT_BINARY) { 68 // Don't complain if parseBinaryNetlinkMessage returns false. That can 69 // just mean that the buffer contained no messages we're interested in. 70 SLOGE("Error decoding NetlinkEvent"); 71 } 72 73 delete evt; 74 return true; 75 } 76
