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237 lines
7.7 KiB
237 lines
7.7 KiB
/*
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* Copyright (C) 2016 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_HIDL_BINDER_SUPPORT_H
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#define ANDROID_HIDL_BINDER_SUPPORT_H
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#include <sys/types.h>
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#include <android/hidl/base/1.0/BnHwBase.h>
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#include <android/hidl/base/1.0/IBase.h>
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#include <hidl/HidlSupport.h>
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#include <hidl/HidlTransportUtils.h>
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#include <hidl/MQDescriptor.h>
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#include <hwbinder/IBinder.h>
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#include <hwbinder/Parcel.h>
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#include <log/log.h> // TODO(b/65843592): remove. Too many users depending on this transitively.
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// Defines functions for hidl_string, Status, hidl_vec, MQDescriptor,
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// etc. to interact with Parcel.
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namespace android {
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namespace hardware {
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// hidl_binder_death_recipient wraps a transport-independent
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// hidl_death_recipient, and implements the binder-specific
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// DeathRecipient interface.
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struct hidl_binder_death_recipient : IBinder::DeathRecipient {
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hidl_binder_death_recipient(const sp<hidl_death_recipient> &recipient,
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uint64_t cookie, const sp<::android::hidl::base::V1_0::IBase> &base);
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virtual void binderDied(const wp<IBinder>& /*who*/);
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wp<hidl_death_recipient> getRecipient();
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private:
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wp<hidl_death_recipient> mRecipient;
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uint64_t mCookie;
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wp<::android::hidl::base::V1_0::IBase> mBase;
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};
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// ---------------------- hidl_handle
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status_t readEmbeddedFromParcel(const hidl_handle &handle,
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const Parcel &parcel, size_t parentHandle, size_t parentOffset);
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status_t writeEmbeddedToParcel(const hidl_handle &handle,
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Parcel *parcel, size_t parentHandle, size_t parentOffset);
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// ---------------------- hidl_memory
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status_t readEmbeddedFromParcel(const hidl_memory &memory,
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const Parcel &parcel, size_t parentHandle, size_t parentOffset);
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status_t writeEmbeddedToParcel(const hidl_memory &memory,
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Parcel *parcel, size_t parentHandle, size_t parentOffset);
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// ---------------------- hidl_string
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status_t readEmbeddedFromParcel(const hidl_string &string,
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const Parcel &parcel, size_t parentHandle, size_t parentOffset);
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status_t writeEmbeddedToParcel(const hidl_string &string,
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Parcel *parcel, size_t parentHandle, size_t parentOffset);
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// ---------------------- Status
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// Bear in mind that if the client or service is a Java endpoint, this
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// is not the logic which will provide/interpret the data here.
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status_t readFromParcel(Status *status, const Parcel& parcel);
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status_t writeToParcel(const Status &status, Parcel* parcel);
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// ---------------------- hidl_vec
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template<typename T>
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status_t readEmbeddedFromParcel(
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const hidl_vec<T> &vec,
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const Parcel &parcel,
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size_t parentHandle,
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size_t parentOffset,
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size_t *handle) {
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const void *out;
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return parcel.readNullableEmbeddedBuffer(
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vec.size() * sizeof(T),
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handle,
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parentHandle,
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parentOffset + hidl_vec<T>::kOffsetOfBuffer,
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&out);
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}
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template<typename T>
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status_t writeEmbeddedToParcel(
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const hidl_vec<T> &vec,
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Parcel *parcel,
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size_t parentHandle,
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size_t parentOffset,
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size_t *handle) {
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return parcel->writeEmbeddedBuffer(
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vec.data(),
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sizeof(T) * vec.size(),
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handle,
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parentHandle,
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parentOffset + hidl_vec<T>::kOffsetOfBuffer);
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}
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template<typename T>
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status_t findInParcel(const hidl_vec<T> &vec, const Parcel &parcel, size_t *handle) {
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return parcel.quickFindBuffer(vec.data(), handle);
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}
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// ---------------------- MQDescriptor
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template<typename T, MQFlavor flavor>
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::android::status_t readEmbeddedFromParcel(
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MQDescriptor<T, flavor> &obj,
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const ::android::hardware::Parcel &parcel,
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size_t parentHandle,
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size_t parentOffset) {
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::android::status_t _hidl_err = ::android::OK;
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size_t _hidl_grantors_child;
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_hidl_err = ::android::hardware::readEmbeddedFromParcel(
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obj.grantors(),
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parcel,
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parentHandle,
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parentOffset + MQDescriptor<T, flavor>::kOffsetOfGrantors,
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&_hidl_grantors_child);
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if (_hidl_err != ::android::OK) { return _hidl_err; }
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const native_handle_t *_hidl_mq_handle_ptr;
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_hidl_err = parcel.readNullableEmbeddedNativeHandle(
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parentHandle,
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parentOffset + MQDescriptor<T, flavor>::kOffsetOfHandle,
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&_hidl_mq_handle_ptr);
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if (_hidl_err != ::android::OK) { return _hidl_err; }
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return _hidl_err;
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}
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template<typename T, MQFlavor flavor>
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::android::status_t writeEmbeddedToParcel(
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const MQDescriptor<T, flavor> &obj,
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::android::hardware::Parcel *parcel,
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size_t parentHandle,
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size_t parentOffset) {
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::android::status_t _hidl_err = ::android::OK;
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size_t _hidl_grantors_child;
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_hidl_err = ::android::hardware::writeEmbeddedToParcel(
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obj.grantors(),
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parcel,
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parentHandle,
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parentOffset + MQDescriptor<T, flavor>::kOffsetOfGrantors,
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&_hidl_grantors_child);
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if (_hidl_err != ::android::OK) { return _hidl_err; }
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_hidl_err = parcel->writeEmbeddedNativeHandle(
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obj.handle(),
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parentHandle,
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parentOffset + MQDescriptor<T, flavor>::kOffsetOfHandle);
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if (_hidl_err != ::android::OK) { return _hidl_err; }
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return _hidl_err;
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}
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// ---------------------- support for casting interfaces
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// Constructs a binder for this interface and caches it. If it has already been created
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// then it returns it.
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sp<IBinder> getOrCreateCachedBinder(::android::hidl::base::V1_0::IBase* ifacePtr);
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// Construct a smallest possible binder from the given interface.
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// If it is remote, then its remote() will be retrieved.
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// Otherwise, the smallest possible BnChild is found where IChild is a subclass of IType
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// and iface is of class IChild. BnChild will be used to wrapped the given iface.
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// Return nullptr if iface is null or any failure.
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template <typename IType,
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typename = std::enable_if_t<std::is_same<details::i_tag, typename IType::_hidl_tag>::value>>
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sp<IBinder> toBinder(sp<IType> iface) {
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IType *ifacePtr = iface.get();
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return getOrCreateCachedBinder(ifacePtr);
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}
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template <typename IType, typename ProxyType, typename StubType>
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sp<IType> fromBinder(const sp<IBinder>& binderIface) {
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using ::android::hidl::base::V1_0::IBase;
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using ::android::hidl::base::V1_0::BnHwBase;
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if (binderIface.get() == nullptr) {
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return nullptr;
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}
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if (binderIface->localBinder() == nullptr) {
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return new ProxyType(binderIface);
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}
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// Ensure that IBinder is BnHwBase (not JHwBinder, for instance)
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if (!binderIface->checkSubclass(IBase::descriptor)) {
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return new ProxyType(binderIface);
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}
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sp<IBase> base = static_cast<BnHwBase*>(binderIface.get())->getImpl();
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if (details::canCastInterface(base.get(), IType::descriptor)) {
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return static_cast<IType*>(base.get());
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} else {
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return nullptr;
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}
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}
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void configureBinderRpcThreadpool(size_t maxThreads, bool callerWillJoin);
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void joinBinderRpcThreadpool();
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int setupBinderPolling();
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status_t handleBinderPoll();
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void addPostCommandTask(const std::function<void(void)> task);
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} // namespace hardware
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} // namespace android
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#endif // ANDROID_HIDL_BINDER_SUPPORT_H
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