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      1 /*
      2  * Copyright (C) 2010 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 #ifndef ANDROID_GUI_SENSOR_CHANNEL_H
     18 #define ANDROID_GUI_SENSOR_CHANNEL_H
     19 
     20 #include <stdint.h>
     21 #include <sys/types.h>
     22 
     23 #include <utils/Errors.h>
     24 #include <utils/RefBase.h>
     25 #include <cutils/log.h>
     26 
     27 
     28 namespace android {
     29 // ----------------------------------------------------------------------------
     30 class Parcel;
     31 
     32 class BitTube : public RefBase
     33 {
     34 public:
     35 
     36             BitTube();
     37             BitTube(const Parcel& data);
     38     virtual ~BitTube();
     39 
     40     status_t initCheck() const;
     41     int getFd() const;
     42     ssize_t write(void const* vaddr, size_t size);
     43     ssize_t read(void* vaddr, size_t size);
     44 
     45     status_t writeToParcel(Parcel* reply) const;
     46 
     47     template <typename T>
     48     static ssize_t sendObjects(const sp<BitTube>& tube,
     49             T const* events, size_t count) {
     50         return sendObjects(tube, events, count, sizeof(T));
     51     }
     52 
     53     template <typename T>
     54     static ssize_t recvObjects(const sp<BitTube>& tube,
     55             T* events, size_t count) {
     56         return recvObjects(tube, events, count, sizeof(T));
     57     }
     58 
     59 private:
     60     int mSendFd;
     61     mutable int mReceiveFd;
     62 
     63     static ssize_t sendObjects(const sp<BitTube>& tube,
     64             void const* events, size_t count, size_t objSize);
     65 
     66     static ssize_t recvObjects(const sp<BitTube>& tube,
     67             void* events, size_t count, size_t objSize);
     68 };
     69 
     70 // ----------------------------------------------------------------------------
     71 }; // namespace android
     72 
     73 #endif // ANDROID_GUI_SENSOR_CHANNEL_H
     74