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96 lines
2.9 KiB
96 lines
2.9 KiB
6 years ago
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/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_GUI_SENSOR_CHANNEL_H
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#define ANDROID_GUI_SENSOR_CHANNEL_H
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#include <stdint.h>
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#include <sys/types.h>
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#include <utils/Errors.h>
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#include <utils/RefBase.h>
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#include <cutils/log.h>
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namespace android {
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// ----------------------------------------------------------------------------
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class Parcel;
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class BitTube : public RefBase
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{
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public:
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// creates a BitTube with a default (4KB) send buffer
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BitTube();
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// creates a BitTube with a a specified send and receive buffer size
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explicit BitTube(size_t bufsize);
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explicit BitTube(const Parcel& data);
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virtual ~BitTube();
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// check state after construction
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status_t initCheck() const;
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// get receive file-descriptor
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int getFd() const;
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// get the send file-descriptor.
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int getSendFd() const;
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// send objects (sized blobs). All objects are guaranteed to be written or the call fails.
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template <typename T>
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static ssize_t sendObjects(const sp<BitTube>& tube,
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T const* events, size_t count) {
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return sendObjects(tube, events, count, sizeof(T));
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}
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// receive objects (sized blobs). If the receiving buffer isn't large enough,
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// excess messages are silently discarded.
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template <typename T>
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static ssize_t recvObjects(const sp<BitTube>& tube,
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T* events, size_t count) {
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return recvObjects(tube, events, count, sizeof(T));
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}
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// parcels this BitTube
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status_t writeToParcel(Parcel* reply) const;
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private:
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void init(size_t rcvbuf, size_t sndbuf);
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// send a message. The write is guaranteed to send the whole message or fail.
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ssize_t write(void const* vaddr, size_t size);
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// receive a message. the passed buffer must be at least as large as the
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// write call used to send the message, excess data is silently discarded.
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ssize_t read(void* vaddr, size_t size);
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int mSendFd;
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mutable int mReceiveFd;
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static ssize_t sendObjects(const sp<BitTube>& tube,
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void const* events, size_t count, size_t objSize);
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static ssize_t recvObjects(const sp<BitTube>& tube,
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void* events, size_t count, size_t objSize);
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};
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// ----------------------------------------------------------------------------
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}; // namespace android
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#endif // ANDROID_GUI_SENSOR_CHANNEL_H
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