| /* |
| * Copyright (C) 2010 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. |
| */ |
| |
| #ifndef ANDROID_GUI_SENSOR_CHANNEL_H |
| #define ANDROID_GUI_SENSOR_CHANNEL_H |
| |
| #include <stdint.h> |
| #include <sys/types.h> |
| |
| #include <utils/Errors.h> |
| #include <utils/RefBase.h> |
| #include <cutils/log.h> |
| |
| |
| namespace android { |
| // ---------------------------------------------------------------------------- |
| class Parcel; |
| |
| class BitTube : public RefBase |
| { |
| public: |
| |
| // creates a BitTube with a default (4KB) send buffer |
| BitTube(); |
| |
| // creates a BitTube with a a specified send and receive buffer size |
| explicit BitTube(size_t bufsize); |
| |
| explicit BitTube(const Parcel& data); |
| virtual ~BitTube(); |
| |
| // check state after construction |
| status_t initCheck() const; |
| |
| // get receive file-descriptor |
| int getFd() const; |
| |
| // get the send file-descriptor. |
| int getSendFd() const; |
| |
| // send objects (sized blobs). All objects are guaranteed to be written or the call fails. |
| template <typename T> |
| static ssize_t sendObjects(const sp<BitTube>& tube, |
| T const* events, size_t count) { |
| return sendObjects(tube, events, count, sizeof(T)); |
| } |
| |
| // receive objects (sized blobs). If the receiving buffer isn't large enough, |
| // excess messages are silently discarded. |
| template <typename T> |
| static ssize_t recvObjects(const sp<BitTube>& tube, |
| T* events, size_t count) { |
| return recvObjects(tube, events, count, sizeof(T)); |
| } |
| |
| // parcels this BitTube |
| status_t writeToParcel(Parcel* reply) const; |
| |
| private: |
| void init(size_t rcvbuf, size_t sndbuf); |
| |
| // send a message. The write is guaranteed to send the whole message or fail. |
| ssize_t write(void const* vaddr, size_t size); |
| |
| // receive a message. the passed buffer must be at least as large as the |
| // write call used to send the message, excess data is silently discarded. |
| ssize_t read(void* vaddr, size_t size); |
| |
| int mSendFd; |
| mutable int mReceiveFd; |
| |
| static ssize_t sendObjects(const sp<BitTube>& tube, |
| void const* events, size_t count, size_t objSize); |
| |
| static ssize_t recvObjects(const sp<BitTube>& tube, |
| void* events, size_t count, size_t objSize); |
| }; |
| |
| // ---------------------------------------------------------------------------- |
| }; // namespace android |
| |
| #endif // ANDROID_GUI_SENSOR_CHANNEL_H |