| // |
| // Copyright 2010 The Android Open Source Project |
| // |
| // Provides a shared memory transport for input events. |
| // |
| #define LOG_TAG "InputTransport" |
| |
| //#define LOG_NDEBUG 0 |
| |
| // Log debug messages about channel messages (send message, receive message) |
| #define DEBUG_CHANNEL_MESSAGES 0 |
| |
| // Log debug messages whenever InputChannel objects are created/destroyed |
| #define DEBUG_CHANNEL_LIFECYCLE 0 |
| |
| // Log debug messages about transport actions |
| #define DEBUG_TRANSPORT_ACTIONS 0 |
| |
| |
| #include <cutils/log.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <androidfw/InputTransport.h> |
| #include <unistd.h> |
| #include <sys/types.h> |
| #include <sys/socket.h> |
| |
| |
| namespace android { |
| |
| // Socket buffer size. The default is typically about 128KB, which is much larger than |
| // we really need. So we make it smaller. It just needs to be big enough to hold |
| // a few dozen large multi-finger motion events in the case where an application gets |
| // behind processing touches. |
| static const size_t SOCKET_BUFFER_SIZE = 32 * 1024; |
| |
| |
| // --- InputMessage --- |
| |
| bool InputMessage::isValid(size_t actualSize) const { |
| if (size() == actualSize) { |
| switch (header.type) { |
| case TYPE_KEY: |
| return true; |
| case TYPE_MOTION: |
| return body.motion.pointerCount > 0 |
| && body.motion.pointerCount <= MAX_POINTERS; |
| case TYPE_FINISHED: |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| size_t InputMessage::size() const { |
| switch (header.type) { |
| case TYPE_KEY: |
| return sizeof(Header) + body.key.size(); |
| case TYPE_MOTION: |
| return sizeof(Header) + body.motion.size(); |
| case TYPE_FINISHED: |
| return sizeof(Header) + body.finished.size(); |
| } |
| return sizeof(Header); |
| } |
| |
| |
| // --- InputChannel --- |
| |
| InputChannel::InputChannel(const String8& name, int fd) : |
| mName(name), mFd(fd) { |
| #if DEBUG_CHANNEL_LIFECYCLE |
| ALOGD("Input channel constructed: name='%s', fd=%d", |
| mName.string(), fd); |
| #endif |
| |
| int result = fcntl(mFd, F_SETFL, O_NONBLOCK); |
| LOG_ALWAYS_FATAL_IF(result != 0, "channel '%s' ~ Could not make socket " |
| "non-blocking. errno=%d", mName.string(), errno); |
| } |
| |
| InputChannel::~InputChannel() { |
| #if DEBUG_CHANNEL_LIFECYCLE |
| ALOGD("Input channel destroyed: name='%s', fd=%d", |
| mName.string(), mFd); |
| #endif |
| |
| ::close(mFd); |
| } |
| |
| status_t InputChannel::openInputChannelPair(const String8& name, |
| sp<InputChannel>& outServerChannel, sp<InputChannel>& outClientChannel) { |
| int sockets[2]; |
| if (socketpair(AF_UNIX, SOCK_SEQPACKET, 0, sockets)) { |
| status_t result = -errno; |
| ALOGE("channel '%s' ~ Could not create socket pair. errno=%d", |
| name.string(), errno); |
| outServerChannel.clear(); |
| outClientChannel.clear(); |
| return result; |
| } |
| |
| int bufferSize = SOCKET_BUFFER_SIZE; |
| setsockopt(sockets[0], SOL_SOCKET, SO_SNDBUF, &bufferSize, sizeof(bufferSize)); |
| setsockopt(sockets[0], SOL_SOCKET, SO_RCVBUF, &bufferSize, sizeof(bufferSize)); |
| setsockopt(sockets[1], SOL_SOCKET, SO_SNDBUF, &bufferSize, sizeof(bufferSize)); |
| setsockopt(sockets[1], SOL_SOCKET, SO_RCVBUF, &bufferSize, sizeof(bufferSize)); |
| |
| String8 serverChannelName = name; |
| serverChannelName.append(" (server)"); |
| outServerChannel = new InputChannel(serverChannelName, sockets[0]); |
| |
| String8 clientChannelName = name; |
| clientChannelName.append(" (client)"); |
| outClientChannel = new InputChannel(clientChannelName, sockets[1]); |
| return OK; |
| } |
| |
| status_t InputChannel::sendMessage(const InputMessage* msg) { |
| size_t msgLength = msg->size(); |
| ssize_t nWrite; |
| do { |
| nWrite = ::send(mFd, msg, msgLength, MSG_DONTWAIT | MSG_NOSIGNAL); |
| } while (nWrite == -1 && errno == EINTR); |
| |
| if (nWrite < 0) { |
| int error = errno; |
| #if DEBUG_CHANNEL_MESSAGES |
| ALOGD("channel '%s' ~ error sending message of type %d, errno=%d", mName.string(), |
| msg->header.type, error); |
| #endif |
| if (error == EAGAIN || error == EWOULDBLOCK) { |
| return WOULD_BLOCK; |
| } |
| if (error == EPIPE || error == ENOTCONN) { |
| return DEAD_OBJECT; |
| } |
| return -error; |
| } |
| |
| if (size_t(nWrite) != msgLength) { |
| #if DEBUG_CHANNEL_MESSAGES |
| ALOGD("channel '%s' ~ error sending message type %d, send was incomplete", |
| mName.string(), msg->header.type); |
| #endif |
| return DEAD_OBJECT; |
| } |
| |
| #if DEBUG_CHANNEL_MESSAGES |
| ALOGD("channel '%s' ~ sent message of type %d", mName.string(), msg->header.type); |
| #endif |
| return OK; |
| } |
| |
| status_t InputChannel::receiveMessage(InputMessage* msg) { |
| ssize_t nRead; |
| do { |
| nRead = ::recv(mFd, msg, sizeof(InputMessage), MSG_DONTWAIT); |
| } while (nRead == -1 && errno == EINTR); |
| |
| if (nRead < 0) { |
| int error = errno; |
| #if DEBUG_CHANNEL_MESSAGES |
| ALOGD("channel '%s' ~ receive message failed, errno=%d", mName.string(), errno); |
| #endif |
| if (error == EAGAIN || error == EWOULDBLOCK) { |
| return WOULD_BLOCK; |
| } |
| if (error == EPIPE || error == ENOTCONN) { |
| return DEAD_OBJECT; |
| } |
| return -error; |
| } |
| |
| if (nRead == 0) { // check for EOF |
| #if DEBUG_CHANNEL_MESSAGES |
| ALOGD("channel '%s' ~ receive message failed because peer was closed", mName.string()); |
| #endif |
| return DEAD_OBJECT; |
| } |
| |
| if (!msg->isValid(nRead)) { |
| #if DEBUG_CHANNEL_MESSAGES |
| ALOGD("channel '%s' ~ received invalid message", mName.string()); |
| #endif |
| return BAD_VALUE; |
| } |
| |
| #if DEBUG_CHANNEL_MESSAGES |
| ALOGD("channel '%s' ~ received message of type %d", mName.string(), msg->header.type); |
| #endif |
| return OK; |
| } |
| |
| |
| // --- InputPublisher --- |
| |
| InputPublisher::InputPublisher(const sp<InputChannel>& channel) : |
| mChannel(channel) { |
| } |
| |
| InputPublisher::~InputPublisher() { |
| } |
| |
| status_t InputPublisher::publishKeyEvent( |
| uint32_t seq, |
| int32_t deviceId, |
| int32_t source, |
| int32_t action, |
| int32_t flags, |
| int32_t keyCode, |
| int32_t scanCode, |
| int32_t metaState, |
| int32_t repeatCount, |
| nsecs_t downTime, |
| nsecs_t eventTime) { |
| #if DEBUG_TRANSPORT_ACTIONS |
| ALOGD("channel '%s' publisher ~ publishKeyEvent: seq=%u, deviceId=%d, source=0x%x, " |
| "action=0x%x, flags=0x%x, keyCode=%d, scanCode=%d, metaState=0x%x, repeatCount=%d," |
| "downTime=%lld, eventTime=%lld", |
| mChannel->getName().string(), seq, |
| deviceId, source, action, flags, keyCode, scanCode, metaState, repeatCount, |
| downTime, eventTime); |
| #endif |
| |
| if (!seq) { |
| ALOGE("Attempted to publish a key event with sequence number 0."); |
| return BAD_VALUE; |
| } |
| |
| InputMessage msg; |
| msg.header.type = InputMessage::TYPE_KEY; |
| msg.body.key.seq = seq; |
| msg.body.key.deviceId = deviceId; |
| msg.body.key.source = source; |
| msg.body.key.action = action; |
| msg.body.key.flags = flags; |
| msg.body.key.keyCode = keyCode; |
| msg.body.key.scanCode = scanCode; |
| msg.body.key.metaState = metaState; |
| msg.body.key.repeatCount = repeatCount; |
| msg.body.key.downTime = downTime; |
| msg.body.key.eventTime = eventTime; |
| return mChannel->sendMessage(&msg); |
| } |
| |
| status_t InputPublisher::publishMotionEvent( |
| uint32_t seq, |
| int32_t deviceId, |
| int32_t source, |
| int32_t action, |
| int32_t flags, |
| int32_t edgeFlags, |
| int32_t metaState, |
| int32_t buttonState, |
| float xOffset, |
| float yOffset, |
| float xPrecision, |
| float yPrecision, |
| nsecs_t downTime, |
| nsecs_t eventTime, |
| size_t pointerCount, |
| const PointerProperties* pointerProperties, |
| const PointerCoords* pointerCoords) { |
| #if DEBUG_TRANSPORT_ACTIONS |
| ALOGD("channel '%s' publisher ~ publishMotionEvent: seq=%u, deviceId=%d, source=0x%x, " |
| "action=0x%x, flags=0x%x, edgeFlags=0x%x, metaState=0x%x, buttonState=0x%x, " |
| "xOffset=%f, yOffset=%f, " |
| "xPrecision=%f, yPrecision=%f, downTime=%lld, eventTime=%lld, " |
| "pointerCount=%d", |
| mChannel->getName().string(), seq, |
| deviceId, source, action, flags, edgeFlags, metaState, buttonState, |
| xOffset, yOffset, xPrecision, yPrecision, downTime, eventTime, pointerCount); |
| #endif |
| |
| if (!seq) { |
| ALOGE("Attempted to publish a motion event with sequence number 0."); |
| return BAD_VALUE; |
| } |
| |
| if (pointerCount > MAX_POINTERS || pointerCount < 1) { |
| ALOGE("channel '%s' publisher ~ Invalid number of pointers provided: %d.", |
| mChannel->getName().string(), pointerCount); |
| return BAD_VALUE; |
| } |
| |
| InputMessage msg; |
| msg.header.type = InputMessage::TYPE_MOTION; |
| msg.body.motion.seq = seq; |
| msg.body.motion.deviceId = deviceId; |
| msg.body.motion.source = source; |
| msg.body.motion.action = action; |
| msg.body.motion.flags = flags; |
| msg.body.motion.edgeFlags = edgeFlags; |
| msg.body.motion.metaState = metaState; |
| msg.body.motion.buttonState = buttonState; |
| msg.body.motion.xOffset = xOffset; |
| msg.body.motion.yOffset = yOffset; |
| msg.body.motion.xPrecision = xPrecision; |
| msg.body.motion.yPrecision = yPrecision; |
| msg.body.motion.downTime = downTime; |
| msg.body.motion.eventTime = eventTime; |
| msg.body.motion.pointerCount = pointerCount; |
| for (size_t i = 0; i < pointerCount; i++) { |
| msg.body.motion.pointers[i].properties.copyFrom(pointerProperties[i]); |
| msg.body.motion.pointers[i].coords.copyFrom(pointerCoords[i]); |
| } |
| return mChannel->sendMessage(&msg); |
| } |
| |
| status_t InputPublisher::receiveFinishedSignal(uint32_t* outSeq, bool* outHandled) { |
| #if DEBUG_TRANSPORT_ACTIONS |
| ALOGD("channel '%s' publisher ~ receiveFinishedSignal", |
| mChannel->getName().string()); |
| #endif |
| |
| InputMessage msg; |
| status_t result = mChannel->receiveMessage(&msg); |
| if (result) { |
| *outSeq = 0; |
| *outHandled = false; |
| return result; |
| } |
| if (msg.header.type != InputMessage::TYPE_FINISHED) { |
| ALOGE("channel '%s' publisher ~ Received unexpected message of type %d from consumer", |
| mChannel->getName().string(), msg.header.type); |
| return UNKNOWN_ERROR; |
| } |
| *outSeq = msg.body.finished.seq; |
| *outHandled = msg.body.finished.handled; |
| return OK; |
| } |
| |
| // --- InputConsumer --- |
| |
| InputConsumer::InputConsumer(const sp<InputChannel>& channel) : |
| mChannel(channel), mMsgDeferred(false) { |
| } |
| |
| InputConsumer::~InputConsumer() { |
| } |
| |
| status_t InputConsumer::consume(InputEventFactoryInterface* factory, |
| bool consumeBatches, uint32_t* outSeq, InputEvent** outEvent) { |
| #if DEBUG_TRANSPORT_ACTIONS |
| ALOGD("channel '%s' consumer ~ consume: consumeBatches=%s", |
| mChannel->getName().string(), consumeBatches ? "true" : "false"); |
| #endif |
| |
| *outSeq = 0; |
| *outEvent = NULL; |
| |
| // Fetch the next input message. |
| // Loop until an event can be returned or no additional events are received. |
| while (!*outEvent) { |
| if (mMsgDeferred) { |
| // mMsg contains a valid input message from the previous call to consume |
| // that has not yet been processed. |
| mMsgDeferred = false; |
| } else { |
| // Receive a fresh message. |
| status_t result = mChannel->receiveMessage(&mMsg); |
| if (result) { |
| // Consume the next batched event unless batches are being held for later. |
| if (!mBatches.isEmpty() && (consumeBatches || result != WOULD_BLOCK)) { |
| MotionEvent* motionEvent = factory->createMotionEvent(); |
| if (! motionEvent) return NO_MEMORY; |
| |
| const Batch& batch = mBatches.top(); |
| motionEvent->copyFrom(&batch.event, true /*keepHistory*/); |
| *outSeq = batch.seq; |
| *outEvent = motionEvent; |
| mBatches.pop(); |
| #if DEBUG_TRANSPORT_ACTIONS |
| ALOGD("channel '%s' consumer ~ consumed batch event, seq=%u", |
| mChannel->getName().string(), *outSeq); |
| #endif |
| break; |
| } |
| return result; |
| } |
| } |
| |
| switch (mMsg.header.type) { |
| case InputMessage::TYPE_KEY: { |
| KeyEvent* keyEvent = factory->createKeyEvent(); |
| if (!keyEvent) return NO_MEMORY; |
| |
| initializeKeyEvent(keyEvent, &mMsg); |
| *outSeq = mMsg.body.key.seq; |
| *outEvent = keyEvent; |
| #if DEBUG_TRANSPORT_ACTIONS |
| ALOGD("channel '%s' consumer ~ consumed key event, seq=%u", |
| mChannel->getName().string(), *outSeq); |
| #endif |
| break; |
| } |
| |
| case AINPUT_EVENT_TYPE_MOTION: { |
| ssize_t batchIndex = findBatch(mMsg.body.motion.deviceId, mMsg.body.motion.source); |
| if (batchIndex >= 0) { |
| Batch& batch = mBatches.editItemAt(batchIndex); |
| if (canAppendSamples(&batch.event, &mMsg)) { |
| // Append to the batch and save the new sequence number for the tail end. |
| uint32_t chain = batch.seq; |
| appendSamples(&batch.event, &mMsg); |
| batch.seq = mMsg.body.motion.seq; |
| |
| // Update the sequence number chain. |
| SeqChain seqChain; |
| seqChain.seq = batch.seq; |
| seqChain.chain = chain; |
| mSeqChains.push(seqChain); |
| #if DEBUG_TRANSPORT_ACTIONS |
| ALOGD("channel '%s' consumer ~ appended to batch event", |
| mChannel->getName().string()); |
| #endif |
| break; |
| } else { |
| MotionEvent* motionEvent = factory->createMotionEvent(); |
| if (! motionEvent) return NO_MEMORY; |
| |
| // We cannot append to the batch in progress, so we need to consume |
| // the previous batch right now and defer the new message until later. |
| mMsgDeferred = true; |
| |
| // Return the end of the previous batch. |
| motionEvent->copyFrom(&batch.event, true /*keepHistory*/); |
| *outSeq = batch.seq; |
| *outEvent = motionEvent; |
| mBatches.removeAt(batchIndex); |
| #if DEBUG_TRANSPORT_ACTIONS |
| ALOGD("channel '%s' consumer ~ consumed batch event and " |
| "deferred current event, seq=%u", |
| mChannel->getName().string(), *outSeq); |
| #endif |
| break; |
| } |
| } |
| |
| // Start a new batch if needed. |
| if (mMsg.body.motion.action == AMOTION_EVENT_ACTION_MOVE |
| || mMsg.body.motion.action == AMOTION_EVENT_ACTION_HOVER_MOVE) { |
| mBatches.push(); |
| Batch& batch = mBatches.editTop(); |
| batch.seq = mMsg.body.motion.seq; |
| initializeMotionEvent(&batch.event, &mMsg); |
| #if DEBUG_TRANSPORT_ACTIONS |
| ALOGD("channel '%s' consumer ~ started batch event", |
| mChannel->getName().string()); |
| #endif |
| break; |
| } |
| |
| MotionEvent* motionEvent = factory->createMotionEvent(); |
| if (! motionEvent) return NO_MEMORY; |
| |
| initializeMotionEvent(motionEvent, &mMsg); |
| *outSeq = mMsg.body.motion.seq; |
| *outEvent = motionEvent; |
| #if DEBUG_TRANSPORT_ACTIONS |
| ALOGD("channel '%s' consumer ~ consumed motion event, seq=%u", |
| mChannel->getName().string(), *outSeq); |
| #endif |
| break; |
| } |
| |
| default: |
| ALOGE("channel '%s' consumer ~ Received unexpected message of type %d", |
| mChannel->getName().string(), mMsg.header.type); |
| return UNKNOWN_ERROR; |
| } |
| } |
| return OK; |
| } |
| |
| status_t InputConsumer::sendFinishedSignal(uint32_t seq, bool handled) { |
| #if DEBUG_TRANSPORT_ACTIONS |
| ALOGD("channel '%s' consumer ~ sendFinishedSignal: seq=%u, handled=%s", |
| mChannel->getName().string(), seq, handled ? "true" : "false"); |
| #endif |
| |
| if (!seq) { |
| ALOGE("Attempted to send a finished signal with sequence number 0."); |
| return BAD_VALUE; |
| } |
| |
| // Send finished signals for the batch sequence chain first. |
| size_t seqChainCount = mSeqChains.size(); |
| if (seqChainCount) { |
| uint32_t currentSeq = seq; |
| uint32_t chainSeqs[seqChainCount]; |
| size_t chainIndex = 0; |
| for (size_t i = seqChainCount; i-- > 0; ) { |
| const SeqChain& seqChain = mSeqChains.itemAt(i); |
| if (seqChain.seq == currentSeq) { |
| currentSeq = seqChain.chain; |
| chainSeqs[chainIndex++] = currentSeq; |
| mSeqChains.removeAt(i); |
| } |
| } |
| status_t status = OK; |
| while (!status && chainIndex-- > 0) { |
| status = sendUnchainedFinishedSignal(chainSeqs[chainIndex], handled); |
| } |
| if (status) { |
| // An error occurred so at least one signal was not sent, reconstruct the chain. |
| do { |
| SeqChain seqChain; |
| seqChain.seq = chainIndex != 0 ? chainSeqs[chainIndex - 1] : seq; |
| seqChain.chain = chainSeqs[chainIndex]; |
| mSeqChains.push(seqChain); |
| } while (chainIndex-- > 0); |
| return status; |
| } |
| } |
| |
| // Send finished signal for the last message in the batch. |
| return sendUnchainedFinishedSignal(seq, handled); |
| } |
| |
| status_t InputConsumer::sendUnchainedFinishedSignal(uint32_t seq, bool handled) { |
| InputMessage msg; |
| msg.header.type = InputMessage::TYPE_FINISHED; |
| msg.body.finished.seq = seq; |
| msg.body.finished.handled = handled; |
| return mChannel->sendMessage(&msg); |
| } |
| |
| bool InputConsumer::hasDeferredEvent() const { |
| return mMsgDeferred; |
| } |
| |
| bool InputConsumer::hasPendingBatch() const { |
| return !mBatches.isEmpty(); |
| } |
| |
| ssize_t InputConsumer::findBatch(int32_t deviceId, int32_t source) const { |
| for (size_t i = 0; i < mBatches.size(); i++) { |
| const Batch& batch = mBatches.itemAt(i); |
| if (batch.event.getDeviceId() == deviceId && batch.event.getSource() == source) { |
| return i; |
| } |
| } |
| return -1; |
| } |
| |
| void InputConsumer::initializeKeyEvent(KeyEvent* event, const InputMessage* msg) { |
| event->initialize( |
| msg->body.key.deviceId, |
| msg->body.key.source, |
| msg->body.key.action, |
| msg->body.key.flags, |
| msg->body.key.keyCode, |
| msg->body.key.scanCode, |
| msg->body.key.metaState, |
| msg->body.key.repeatCount, |
| msg->body.key.downTime, |
| msg->body.key.eventTime); |
| } |
| |
| void InputConsumer::initializeMotionEvent(MotionEvent* event, const InputMessage* msg) { |
| size_t pointerCount = msg->body.motion.pointerCount; |
| PointerProperties pointerProperties[pointerCount]; |
| PointerCoords pointerCoords[pointerCount]; |
| for (size_t i = 0; i < pointerCount; i++) { |
| pointerProperties[i].copyFrom(msg->body.motion.pointers[i].properties); |
| pointerCoords[i].copyFrom(msg->body.motion.pointers[i].coords); |
| } |
| |
| event->initialize( |
| msg->body.motion.deviceId, |
| msg->body.motion.source, |
| msg->body.motion.action, |
| msg->body.motion.flags, |
| msg->body.motion.edgeFlags, |
| msg->body.motion.metaState, |
| msg->body.motion.buttonState, |
| msg->body.motion.xOffset, |
| msg->body.motion.yOffset, |
| msg->body.motion.xPrecision, |
| msg->body.motion.yPrecision, |
| msg->body.motion.downTime, |
| msg->body.motion.eventTime, |
| pointerCount, |
| pointerProperties, |
| pointerCoords); |
| } |
| |
| bool InputConsumer::canAppendSamples(const MotionEvent* event, const InputMessage *msg) { |
| size_t pointerCount = msg->body.motion.pointerCount; |
| if (event->getPointerCount() != pointerCount |
| || event->getAction() != msg->body.motion.action) { |
| return false; |
| } |
| for (size_t i = 0; i < pointerCount; i++) { |
| if (*event->getPointerProperties(i) != msg->body.motion.pointers[i].properties) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| void InputConsumer::appendSamples(MotionEvent* event, const InputMessage* msg) { |
| size_t pointerCount = msg->body.motion.pointerCount; |
| PointerCoords pointerCoords[pointerCount]; |
| for (size_t i = 0; i < pointerCount; i++) { |
| pointerCoords[i].copyFrom(msg->body.motion.pointers[i].coords); |
| } |
| |
| event->setMetaState(event->getMetaState() | msg->body.motion.metaState); |
| event->addSample(msg->body.motion.eventTime, pointerCoords); |
| } |
| |
| } // namespace android |
