transport/HidlBinderSupport.cpp - SHIFTPHONES/android_system_libhidl - Gitiles

 /*
  * Copyright (C) 2016 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.
  */

 #define LOG_TAG "HidlSupport"

 #include <hidl/HidlBinderSupport.h>

 #include <InternalStatic.h>  // TODO(b/69122224): remove this include, for getOrCreateCachedBinder
 #include <hwbinder/IPCThreadState.h>

 // C includes
 #include <unistd.h>

 // C++ includes
 #include <fstream>
 #include <sstream>

 namespace android {
 namespace hardware {

 hidl_binder_death_recipient::hidl_binder_death_recipient(const sp<hidl_death_recipient> &recipient,
         uint64_t cookie, const sp<::android::hidl::base::V1_0::IBase> &base) :
     mRecipient(recipient), mCookie(cookie), mBase(base) {
 }

 void hidl_binder_death_recipient::binderDied(const wp<IBinder>& /*who*/) {
     sp<hidl_death_recipient> recipient = mRecipient.promote();
     if (recipient != nullptr && mBase != nullptr) {
         recipient->serviceDied(mCookie, mBase);
     }
     mBase = nullptr;
 }

 wp<hidl_death_recipient> hidl_binder_death_recipient::getRecipient() {
     return mRecipient;
 }

 const size_t hidl_handle::kOffsetOfNativeHandle = offsetof(hidl_handle, mHandle);
 static_assert(hidl_handle::kOffsetOfNativeHandle == 0, "wrong offset");

 status_t readEmbeddedFromParcel(const hidl_handle& /* handle */,
         const Parcel &parcel, size_t parentHandle, size_t parentOffset) {
     const native_handle_t *handle;
     status_t _hidl_err = parcel.readNullableEmbeddedNativeHandle(
             parentHandle,
             parentOffset + hidl_handle::kOffsetOfNativeHandle,
             &handle);

     return _hidl_err;
 }

 status_t writeEmbeddedToParcel(const hidl_handle &handle,
         Parcel *parcel, size_t parentHandle, size_t parentOffset) {
     status_t _hidl_err = parcel->writeEmbeddedNativeHandle(
             handle.getNativeHandle(),
             parentHandle,
             parentOffset + hidl_handle::kOffsetOfNativeHandle);

     return _hidl_err;
 }

 const size_t hidl_memory::kOffsetOfHandle = offsetof(hidl_memory, mHandle);
 const size_t hidl_memory::kOffsetOfName = offsetof(hidl_memory, mName);
 static_assert(hidl_memory::kOffsetOfHandle == 0, "wrong offset");
 static_assert(hidl_memory::kOffsetOfName == 24, "wrong offset");

 status_t readEmbeddedFromParcel(const hidl_memory& memory,
         const Parcel &parcel, size_t parentHandle, size_t parentOffset) {
     // TODO(b/111883309): Invoke readEmbeddedFromParcel(hidl_handle, ...).
     const native_handle_t *handle;
     ::android::status_t _hidl_err = parcel.readNullableEmbeddedNativeHandle(
             parentHandle,
             parentOffset + hidl_memory::kOffsetOfHandle,
             &handle);

     if (_hidl_err == ::android::OK) {
         _hidl_err = readEmbeddedFromParcel(
                 memory.name(),
                 parcel,
                 parentHandle,
                 parentOffset + hidl_memory::kOffsetOfName);
     }

     return _hidl_err;
 }

 status_t writeEmbeddedToParcel(const hidl_memory &memory,
         Parcel *parcel, size_t parentHandle, size_t parentOffset) {
     // TODO(b/111883309): Invoke writeEmbeddedToParcel(hidl_handle, ...).
     status_t _hidl_err = parcel->writeEmbeddedNativeHandle(
             memory.handle(),
             parentHandle,
             parentOffset + hidl_memory::kOffsetOfHandle);

     if (_hidl_err == ::android::OK) {
         _hidl_err = writeEmbeddedToParcel(
             memory.name(),
             parcel,
             parentHandle,
             parentOffset + hidl_memory::kOffsetOfName);
     }

     return _hidl_err;
 }
 const size_t hidl_string::kOffsetOfBuffer = offsetof(hidl_string, mBuffer);
 static_assert(hidl_string::kOffsetOfBuffer == 0, "wrong offset");

 status_t readEmbeddedFromParcel(const hidl_string &string ,
         const Parcel &parcel, size_t parentHandle, size_t parentOffset) {
     const void *out;

     status_t status = parcel.readEmbeddedBuffer(
             string.size() + 1,
             nullptr /* buffer_handle */,
             parentHandle,
             parentOffset + hidl_string::kOffsetOfBuffer,
             &out);

     if (status != OK) {
         return status;
     }

     // Always safe to access out[string.size()] because we read size+1 bytes
     if (static_cast<const char *>(out)[string.size()] != '\0') {
         ALOGE("Received unterminated hidl_string buffer.");
         return BAD_VALUE;
     }

     return OK;
 }

 status_t writeEmbeddedToParcel(const hidl_string &string,
         Parcel *parcel, size_t parentHandle, size_t parentOffset) {
     return parcel->writeEmbeddedBuffer(
             string.c_str(),
             string.size() + 1,
             nullptr /* handle */,
             parentHandle,
             parentOffset + hidl_string::kOffsetOfBuffer);
 }

 android::status_t writeToParcel(const hidl_version &version, android::hardware::Parcel& parcel) {
     return parcel.writeUint32(static_cast<uint32_t>(version.get_major()) << 16 | version.get_minor());
 }

 hidl_version* readFromParcel(const android::hardware::Parcel& parcel) {
     uint32_t version;
     android::status_t status = parcel.readUint32(&version);
     if (status != OK) {
         return nullptr;
     } else {
         return new hidl_version(version >> 16, version & 0xFFFF);
     }
 }

 status_t readFromParcel(Status *s, const Parcel& parcel) {
     int32_t exception;
     status_t status = parcel.readInt32(&exception);
     if (status != OK) {
         s->setFromStatusT(status);
         return status;
     }

     // Skip over fat response headers.  Not used (or propagated) in native code.
     if (exception == Status::EX_HAS_REPLY_HEADER) {
         // Note that the header size includes the 4 byte size field.
         const int32_t header_start = parcel.dataPosition();
         int32_t header_size;
         status = parcel.readInt32(&header_size);
         if (status != OK) {
             s->setFromStatusT(status);
             return status;
         }
         parcel.setDataPosition(header_start + header_size);
         // And fat response headers are currently only used when there are no
         // exceptions, so act like there was no error.
         exception = Status::EX_NONE;
     }

     if (exception == Status::EX_NONE) {
         *s = Status::ok();
         return status;
     }

     // The remote threw an exception.  Get the message back.
     String16 message;
     status = parcel.readString16(&message);
     if (status != OK) {
         s->setFromStatusT(status);
         return status;
     }

     s->setException(exception, String8(message));

     return status;
 }

 status_t writeToParcel(const Status &s, Parcel* parcel) {
     // Something really bad has happened, and we're not going to even
     // try returning rich error data.
     if (s.exceptionCode() == Status::EX_TRANSACTION_FAILED) {
         return s.transactionError();
     }

     status_t status = parcel->writeInt32(s.exceptionCode());
     if (status != OK) { return status; }
     if (s.exceptionCode() == Status::EX_NONE) {
         // We have no more information to write.
         return status;
     }
     status = parcel->writeString16(String16(s.exceptionMessage()));
     return status;
 }

 sp<IBinder> getOrCreateCachedBinder(::android::hidl::base::V1_0::IBase* ifacePtr) {
     LOG_ALWAYS_FATAL_IF(ifacePtr->isRemote(), "%s does not have a way to construct remote binders",
                         __func__);

     std::string descriptor = details::getDescriptor(ifacePtr);
     if (descriptor.empty()) {
         // interfaceDescriptor fails
         return nullptr;
     }

     // for get + set
     std::unique_lock<std::mutex> _lock = details::gBnMap.lock();

     wp<BHwBinder> wBnObj = details::gBnMap.getLocked(ifacePtr, nullptr);
     sp<IBinder> sBnObj = wBnObj.promote();

     if (sBnObj == nullptr) {
         auto func = details::getBnConstructorMap().get(descriptor, nullptr);
         if (!func) {
             // TODO(b/69122224): remove this static variable when prebuilts updated
             func = details::gBnConstructorMap.get(descriptor, nullptr);
         }
         LOG_ALWAYS_FATAL_IF(func == nullptr, "%s gBnConstructorMap returned null for %s", __func__,
                             descriptor.c_str());

         sBnObj = sp<IBinder>(func(static_cast<void*>(ifacePtr)));
         LOG_ALWAYS_FATAL_IF(sBnObj == nullptr, "%s Bn constructor function returned null for %s",
                             __func__, descriptor.c_str());

         details::gBnMap.setLocked(ifacePtr, static_cast<BHwBinder*>(sBnObj.get()));
     }

     return sBnObj;
 }

 static bool gThreadPoolConfigured = false;

 void configureBinderRpcThreadpool(size_t maxThreads, bool callerWillJoin) {
     status_t ret = ProcessState::self()->setThreadPoolConfiguration(
         maxThreads, callerWillJoin /*callerJoinsPool*/);
     LOG_ALWAYS_FATAL_IF(ret != OK, "Could not setThreadPoolConfiguration: %d", ret);

     gThreadPoolConfigured = true;
 }

 void joinBinderRpcThreadpool() {
     LOG_ALWAYS_FATAL_IF(!gThreadPoolConfigured,
                         "HIDL joinRpcThreadpool without calling configureRpcThreadPool.");
     IPCThreadState::self()->joinThreadPool();
 }

 int setupBinderPolling() {
     int fd;
     int err = IPCThreadState::self()->setupPolling(&fd);

     LOG_ALWAYS_FATAL_IF(err != OK, "Failed to setup binder polling: %d (%s)", err, strerror(err));

     return err == OK ? fd : -1;
 }

 status_t handleBinderPoll() {
     return IPCThreadState::self()->handlePolledCommands();
 }

 void addPostCommandTask(const std::function<void(void)> task) {
     IPCThreadState::self()->addPostCommandTask(task);
 }

 }  // namespace hardware
 }  // namespace android
	/*
	* Copyright (C) 2016 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.
	*/

	#define LOG_TAG "HidlSupport"

	#include <hidl/HidlBinderSupport.h>

	#include <InternalStatic.h> // TODO(b/69122224): remove this include, for getOrCreateCachedBinder
	#include <hwbinder/IPCThreadState.h>

	// C includes
	#include <unistd.h>

	// C++ includes
	#include <fstream>
	#include <sstream>

	namespace android {
	namespace hardware {

	hidl_binder_death_recipient::hidl_binder_death_recipient(const sp<hidl_death_recipient> &recipient,
	uint64_t cookie, const sp<::android::hidl::base::V1_0::IBase> &base) :
	mRecipient(recipient), mCookie(cookie), mBase(base) {
	}

	void hidl_binder_death_recipient::binderDied(const wp<IBinder>& /who/) {
	sp<hidl_death_recipient> recipient = mRecipient.promote();
	if (recipient != nullptr && mBase != nullptr) {
	recipient->serviceDied(mCookie, mBase);
	}
	mBase = nullptr;
	}

	wp<hidl_death_recipient> hidl_binder_death_recipient::getRecipient() {
	return mRecipient;
	}

	const size_t hidl_handle::kOffsetOfNativeHandle = offsetof(hidl_handle, mHandle);
	static_assert(hidl_handle::kOffsetOfNativeHandle == 0, "wrong offset");

	status_t readEmbeddedFromParcel(const hidl_handle& /* handle */,
	const Parcel &parcel, size_t parentHandle, size_t parentOffset) {
	const native_handle_t *handle;
	status_t _hidl_err = parcel.readNullableEmbeddedNativeHandle(
	parentHandle,
	parentOffset + hidl_handle::kOffsetOfNativeHandle,
	&handle);

	return _hidl_err;
	}

	status_t writeEmbeddedToParcel(const hidl_handle &handle,
	Parcel *parcel, size_t parentHandle, size_t parentOffset) {
	status_t _hidl_err = parcel->writeEmbeddedNativeHandle(
	handle.getNativeHandle(),
	parentHandle,
	parentOffset + hidl_handle::kOffsetOfNativeHandle);

	return _hidl_err;
	}

	const size_t hidl_memory::kOffsetOfHandle = offsetof(hidl_memory, mHandle);
	const size_t hidl_memory::kOffsetOfName = offsetof(hidl_memory, mName);
	static_assert(hidl_memory::kOffsetOfHandle == 0, "wrong offset");
	static_assert(hidl_memory::kOffsetOfName == 24, "wrong offset");

	status_t readEmbeddedFromParcel(const hidl_memory& memory,
	const Parcel &parcel, size_t parentHandle, size_t parentOffset) {
	// TODO(b/111883309): Invoke readEmbeddedFromParcel(hidl_handle, ...).
	const native_handle_t *handle;
	::android::status_t _hidl_err = parcel.readNullableEmbeddedNativeHandle(
	parentHandle,
	parentOffset + hidl_memory::kOffsetOfHandle,
	&handle);

	if (_hidl_err == ::android::OK) {
	_hidl_err = readEmbeddedFromParcel(
	memory.name(),
	parcel,
	parentHandle,
	parentOffset + hidl_memory::kOffsetOfName);
	}

	return _hidl_err;
	}

	status_t writeEmbeddedToParcel(const hidl_memory &memory,
	Parcel *parcel, size_t parentHandle, size_t parentOffset) {
	// TODO(b/111883309): Invoke writeEmbeddedToParcel(hidl_handle, ...).
	status_t _hidl_err = parcel->writeEmbeddedNativeHandle(
	memory.handle(),
	parentHandle,
	parentOffset + hidl_memory::kOffsetOfHandle);

	if (_hidl_err == ::android::OK) {
	_hidl_err = writeEmbeddedToParcel(
	memory.name(),
	parcel,
	parentHandle,
	parentOffset + hidl_memory::kOffsetOfName);
	}

	return _hidl_err;
	}
	const size_t hidl_string::kOffsetOfBuffer = offsetof(hidl_string, mBuffer);
	static_assert(hidl_string::kOffsetOfBuffer == 0, "wrong offset");

	status_t readEmbeddedFromParcel(const hidl_string &string ,
	const Parcel &parcel, size_t parentHandle, size_t parentOffset) {
	const void *out;

	status_t status = parcel.readEmbeddedBuffer(
	string.size() + 1,
	nullptr /* buffer_handle */,
	parentHandle,
	parentOffset + hidl_string::kOffsetOfBuffer,
	&out);

	if (status != OK) {
	return status;
	}

	// Always safe to access out[string.size()] because we read size+1 bytes
	if (static_cast<const char *>(out)[string.size()] != '\0') {
	ALOGE("Received unterminated hidl_string buffer.");
	return BAD_VALUE;
	}

	return OK;
	}

	status_t writeEmbeddedToParcel(const hidl_string &string,
	Parcel *parcel, size_t parentHandle, size_t parentOffset) {
	return parcel->writeEmbeddedBuffer(
	string.c_str(),
	string.size() + 1,
	nullptr /* handle */,
	parentHandle,
	parentOffset + hidl_string::kOffsetOfBuffer);
	}

	android::status_t writeToParcel(const hidl_version &version, android::hardware::Parcel& parcel) {
	return parcel.writeUint32(static_cast<uint32_t>(version.get_major()) << 16 \| version.get_minor());
	}

	hidl_version* readFromParcel(const android::hardware::Parcel& parcel) {
	uint32_t version;
	android::status_t status = parcel.readUint32(&version);
	if (status != OK) {
	return nullptr;
	} else {
	return new hidl_version(version >> 16, version & 0xFFFF);
	}
	}

	status_t readFromParcel(Status *s, const Parcel& parcel) {
	int32_t exception;
	status_t status = parcel.readInt32(&exception);
	if (status != OK) {
	s->setFromStatusT(status);
	return status;
	}

	// Skip over fat response headers. Not used (or propagated) in native code.
	if (exception == Status::EX_HAS_REPLY_HEADER) {
	// Note that the header size includes the 4 byte size field.
	const int32_t header_start = parcel.dataPosition();
	int32_t header_size;
	status = parcel.readInt32(&header_size);
	if (status != OK) {
	s->setFromStatusT(status);
	return status;
	}
	parcel.setDataPosition(header_start + header_size);
	// And fat response headers are currently only used when there are no
	// exceptions, so act like there was no error.
	exception = Status::EX_NONE;
	}

	if (exception == Status::EX_NONE) {
	*s = Status::ok();
	return status;
	}

	// The remote threw an exception. Get the message back.
	String16 message;
	status = parcel.readString16(&message);
	if (status != OK) {
	s->setFromStatusT(status);
	return status;
	}

	s->setException(exception, String8(message));

	return status;
	}

	status_t writeToParcel(const Status &s, Parcel* parcel) {
	// Something really bad has happened, and we're not going to even
	// try returning rich error data.
	if (s.exceptionCode() == Status::EX_TRANSACTION_FAILED) {
	return s.transactionError();
	}

	status_t status = parcel->writeInt32(s.exceptionCode());
	if (status != OK) { return status; }
	if (s.exceptionCode() == Status::EX_NONE) {
	// We have no more information to write.
	return status;
	}
	status = parcel->writeString16(String16(s.exceptionMessage()));
	return status;
	}

	sp<IBinder> getOrCreateCachedBinder(::android::hidl::base::V1_0::IBase* ifacePtr) {
	LOG_ALWAYS_FATAL_IF(ifacePtr->isRemote(), "%s does not have a way to construct remote binders",
	__func__);

	std::string descriptor = details::getDescriptor(ifacePtr);
	if (descriptor.empty()) {
	// interfaceDescriptor fails
	return nullptr;
	}

	// for get + set
	std::unique_lock<std::mutex> _lock = details::gBnMap.lock();

	wp<BHwBinder> wBnObj = details::gBnMap.getLocked(ifacePtr, nullptr);
	sp<IBinder> sBnObj = wBnObj.promote();

	if (sBnObj == nullptr) {
	auto func = details::getBnConstructorMap().get(descriptor, nullptr);
	if (!func) {
	// TODO(b/69122224): remove this static variable when prebuilts updated
	func = details::gBnConstructorMap.get(descriptor, nullptr);
	}
	LOG_ALWAYS_FATAL_IF(func == nullptr, "%s gBnConstructorMap returned null for %s", __func__,
	descriptor.c_str());

	sBnObj = sp<IBinder>(func(static_cast<void*>(ifacePtr)));
	LOG_ALWAYS_FATAL_IF(sBnObj == nullptr, "%s Bn constructor function returned null for %s",
	__func__, descriptor.c_str());

	details::gBnMap.setLocked(ifacePtr, static_cast<BHwBinder*>(sBnObj.get()));
	}

	return sBnObj;
	}

	static bool gThreadPoolConfigured = false;

	void configureBinderRpcThreadpool(size_t maxThreads, bool callerWillJoin) {
	status_t ret = ProcessState::self()->setThreadPoolConfiguration(
	maxThreads, callerWillJoin /callerJoinsPool/);
	LOG_ALWAYS_FATAL_IF(ret != OK, "Could not setThreadPoolConfiguration: %d", ret);

	gThreadPoolConfigured = true;
	}

	void joinBinderRpcThreadpool() {
	LOG_ALWAYS_FATAL_IF(!gThreadPoolConfigured,
	"HIDL joinRpcThreadpool without calling configureRpcThreadPool.");
	IPCThreadState::self()->joinThreadPool();
	}

	int setupBinderPolling() {
	int fd;
	int err = IPCThreadState::self()->setupPolling(&fd);

	LOG_ALWAYS_FATAL_IF(err != OK, "Failed to setup binder polling: %d (%s)", err, strerror(err));

	return err == OK ? fd : -1;
	}

	status_t handleBinderPoll() {
	return IPCThreadState::self()->handlePolledCommands();
	}

	void addPostCommandTask(const std::function<void(void)> task) {
	IPCThreadState::self()->addPostCommandTask(task);
	}

	} // namespace hardware
	} // namespace android