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309 lines
10 KiB
309 lines
10 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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#define LOG_TAG "HidlSupport"
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#include <hidl/HidlBinderSupport.h>
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#include <android/hidl/base/1.0/BpHwBase.h>
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#include <android/hidl/manager/1.0/BpHwServiceManager.h>
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#include <android/hidl/manager/1.1/BpHwServiceManager.h>
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#include <android/hidl/manager/1.2/BpHwServiceManager.h>
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#include <hwbinder/IPCThreadState.h>
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#include "InternalStatic.h" // TODO(b/69122224): remove this include, for getOrCreateCachedBinder
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// C includes
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#include <inttypes.h>
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#include <unistd.h>
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// C++ includes
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#include <fstream>
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#include <sstream>
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namespace android {
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namespace hardware {
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hidl_binder_death_recipient::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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mRecipient(recipient), mCookie(cookie), mBase(base) {
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}
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void hidl_binder_death_recipient::binderDied(const wp<IBinder>& /*who*/) {
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sp<hidl_death_recipient> recipient = mRecipient.promote();
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if (recipient != nullptr && mBase != nullptr) {
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recipient->serviceDied(mCookie, mBase);
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}
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mBase = nullptr;
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}
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wp<hidl_death_recipient> hidl_binder_death_recipient::getRecipient() {
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return mRecipient;
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}
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const size_t hidl_handle::kOffsetOfNativeHandle = offsetof(hidl_handle, mHandle);
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static_assert(hidl_handle::kOffsetOfNativeHandle == 0, "wrong offset");
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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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const native_handle_t *handle;
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status_t _hidl_err = parcel.readNullableEmbeddedNativeHandle(
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parentHandle,
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parentOffset + hidl_handle::kOffsetOfNativeHandle,
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&handle);
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return _hidl_err;
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}
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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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status_t _hidl_err = parcel->writeEmbeddedNativeHandle(
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handle.getNativeHandle(),
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parentHandle,
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parentOffset + hidl_handle::kOffsetOfNativeHandle);
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return _hidl_err;
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}
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const size_t hidl_memory::kOffsetOfHandle = offsetof(hidl_memory, mHandle);
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const size_t hidl_memory::kOffsetOfName = offsetof(hidl_memory, mName);
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static_assert(hidl_memory::kOffsetOfHandle == 0, "wrong offset");
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static_assert(hidl_memory::kOffsetOfName == 24, "wrong offset");
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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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// TODO(b/111883309): Invoke readEmbeddedFromParcel(hidl_handle, ...).
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const native_handle_t *handle;
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::android::status_t _hidl_err = parcel.readNullableEmbeddedNativeHandle(
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parentHandle,
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parentOffset + hidl_memory::kOffsetOfHandle,
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&handle);
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if (_hidl_err == ::android::OK) {
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_hidl_err = readEmbeddedFromParcel(
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memory.name(),
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parcel,
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parentHandle,
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parentOffset + hidl_memory::kOffsetOfName);
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}
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// hidl_memory's size is stored in uint64_t, but mapMemory's mmap will map
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// size in size_t. If size is over SIZE_MAX, mapMemory could succeed
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// but the mapped memory's actual size will be smaller than the reported size.
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if (memory.size() > SIZE_MAX) {
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ALOGE("Cannot use memory with %" PRId64 " bytes because it is too large.", memory.size());
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android_errorWriteLog(0x534e4554, "79376389");
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return BAD_VALUE;
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}
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return _hidl_err;
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}
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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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// TODO(b/111883309): Invoke writeEmbeddedToParcel(hidl_handle, ...).
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status_t _hidl_err = parcel->writeEmbeddedNativeHandle(
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memory.handle(),
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parentHandle,
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parentOffset + hidl_memory::kOffsetOfHandle);
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if (_hidl_err == ::android::OK) {
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_hidl_err = writeEmbeddedToParcel(
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memory.name(),
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parcel,
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parentHandle,
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parentOffset + hidl_memory::kOffsetOfName);
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}
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return _hidl_err;
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}
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const size_t hidl_string::kOffsetOfBuffer = offsetof(hidl_string, mBuffer);
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static_assert(hidl_string::kOffsetOfBuffer == 0, "wrong offset");
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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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const void *out;
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status_t status = parcel.readEmbeddedBuffer(
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string.size() + 1,
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nullptr /* buffer_handle */,
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parentHandle,
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parentOffset + hidl_string::kOffsetOfBuffer,
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&out);
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if (status != OK) {
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return status;
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}
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// Always safe to access out[string.size()] because we read size+1 bytes
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if (static_cast<const char *>(out)[string.size()] != '\0') {
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ALOGE("Received unterminated hidl_string buffer.");
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return BAD_VALUE;
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}
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return OK;
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}
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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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return parcel->writeEmbeddedBuffer(
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string.c_str(),
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string.size() + 1,
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nullptr /* handle */,
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parentHandle,
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parentOffset + hidl_string::kOffsetOfBuffer);
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}
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status_t readFromParcel(Status *s, const Parcel& parcel) {
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int32_t exception;
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status_t status = parcel.readInt32(&exception);
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if (status != OK) {
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s->setFromStatusT(status);
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return status;
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}
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if (exception == Status::EX_NONE) {
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*s = Status::ok();
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return status;
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}
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// The remote threw an exception. Get the message back.
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String16 message;
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status = parcel.readString16(&message);
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if (status != OK) {
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s->setFromStatusT(status);
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return status;
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}
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s->setException(exception, String8(message));
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return status;
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}
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status_t writeToParcel(const Status &s, Parcel* parcel) {
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// Something really bad has happened, and we're not going to even
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// try returning rich error data.
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if (s.exceptionCode() == Status::EX_TRANSACTION_FAILED) {
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return s.transactionError();
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}
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status_t status = parcel->writeInt32(s.exceptionCode());
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if (status != OK) { return status; }
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if (s.exceptionCode() == Status::EX_NONE) {
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// We have no more information to write.
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return status;
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}
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status = parcel->writeString16(String16(s.exceptionMessage()));
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return status;
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}
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// assume: iface != nullptr, iface isRemote
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// This function is to sandbox a cast through a BpHw* class into a function, so
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// that we can remove cfi sanitization from it. Do not add additional
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// functionality here.
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__attribute__((no_sanitize("cfi"))) static inline BpHwRefBase* forceGetRefBase(
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::android::hidl::base::V1_0::IBase* ifacePtr) {
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using ::android::hidl::base::V1_0::BpHwBase;
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// canary only
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static_assert(sizeof(BpHwBase) == sizeof(hidl::manager::V1_0::BpHwServiceManager));
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static_assert(sizeof(BpHwBase) == sizeof(hidl::manager::V1_1::BpHwServiceManager));
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static_assert(sizeof(BpHwBase) == sizeof(hidl::manager::V1_2::BpHwServiceManager));
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// All BpHw* are generated the same. This may be BpHwServiceManager,
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// BpHwFoo, or any other class. For ABI compatibility, we can't modify the
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// class hierarchy of these, so we have no way to get BpHwRefBase from a
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// remote ifacePtr.
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BpHwBase* bpBase = static_cast<BpHwBase*>(ifacePtr);
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return static_cast<BpHwRefBase*>(bpBase);
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}
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sp<IBinder> getOrCreateCachedBinder(::android::hidl::base::V1_0::IBase* ifacePtr) {
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if (ifacePtr == nullptr) {
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return nullptr;
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}
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if (ifacePtr->isRemote()) {
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BpHwRefBase* bpRefBase = forceGetRefBase(ifacePtr);
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return sp<IBinder>(bpRefBase->remote());
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}
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std::string descriptor = details::getDescriptor(ifacePtr);
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if (descriptor.empty()) {
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// interfaceDescriptor fails
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return nullptr;
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}
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// for get + set
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std::unique_lock<std::mutex> _lock = details::gBnMap->lock();
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wp<BHwBinder> wBnObj = details::gBnMap->getLocked(ifacePtr, nullptr);
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sp<IBinder> sBnObj = wBnObj.promote();
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if (sBnObj == nullptr) {
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auto func = details::getBnConstructorMap().get(descriptor, nullptr);
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if (!func) {
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// TODO(b/69122224): remove this static variable when prebuilts updated
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func = details::gBnConstructorMap->get(descriptor, nullptr);
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}
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LOG_ALWAYS_FATAL_IF(func == nullptr, "%s gBnConstructorMap returned null for %s", __func__,
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descriptor.c_str());
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sBnObj = sp<IBinder>(func(static_cast<void*>(ifacePtr)));
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LOG_ALWAYS_FATAL_IF(sBnObj == nullptr, "%s Bn constructor function returned null for %s",
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__func__, descriptor.c_str());
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details::gBnMap->setLocked(ifacePtr, static_cast<BHwBinder*>(sBnObj.get()));
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}
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return sBnObj;
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}
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static bool gThreadPoolConfigured = false;
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void configureBinderRpcThreadpool(size_t maxThreads, bool callerWillJoin) {
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status_t ret = ProcessState::self()->setThreadPoolConfiguration(
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maxThreads, callerWillJoin /*callerJoinsPool*/);
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LOG_ALWAYS_FATAL_IF(ret != OK, "Could not setThreadPoolConfiguration: %d", ret);
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gThreadPoolConfigured = true;
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}
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void joinBinderRpcThreadpool() {
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LOG_ALWAYS_FATAL_IF(!gThreadPoolConfigured,
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"HIDL joinRpcThreadpool without calling configureRpcThreadPool.");
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IPCThreadState::self()->joinThreadPool();
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}
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int setupBinderPolling() {
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int fd;
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int err = IPCThreadState::self()->setupPolling(&fd);
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LOG_ALWAYS_FATAL_IF(err != OK, "Failed to setup binder polling: %d (%s)", err, strerror(err));
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return err == OK ? fd : -1;
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}
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status_t handleBinderPoll() {
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return IPCThreadState::self()->handlePolledCommands();
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}
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void addPostCommandTask(const std::function<void(void)> task) {
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IPCThreadState::self()->addPostCommandTask(task);
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}
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} // namespace hardware
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} // namespace android
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