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 */
NetlinkListener(int socket)36 NetlinkListener::NetlinkListener(int socket) :
37 SocketListener(socket, false) {
38 mFormat = NETLINK_FORMAT_ASCII;
39 }
40 #endif
41
NetlinkListener(int socket,int format)42 NetlinkListener::NetlinkListener(int socket, int format) :
43 SocketListener(socket, false), mFormat(format) {
44 }
45
onDataAvailable(SocketClient * cli)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