HidlBinderSupport.cpp revision 108d09d4eae07cd1d70a76187a929dc61548a229
1/* 2 * Copyright (C) 2016 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#define LOG_TAG "HidlSupport" 18 19#include <hidl/HidlBinderSupport.h> 20 21// C includes 22#include <unistd.h> 23 24// C++ includes 25#include <fstream> 26#include <sstream> 27 28namespace android { 29namespace hardware { 30 31hidl_binder_death_recipient::hidl_binder_death_recipient(const sp<hidl_death_recipient> &recipient, 32 uint64_t cookie, const sp<::android::hidl::base::V1_0::IBase> &base) : 33 mRecipient(recipient), mCookie(cookie), mBase(base) { 34} 35 36void hidl_binder_death_recipient::binderDied(const wp<IBinder>& /*who*/) { 37 sp<hidl_death_recipient> recipient = mRecipient.promote(); 38 if (recipient != nullptr) { 39 recipient->serviceDied(mCookie, mBase); 40 } 41} 42 43wp<hidl_death_recipient> hidl_binder_death_recipient::getRecipient() { 44 return mRecipient; 45} 46 47const size_t hidl_memory::kOffsetOfHandle = offsetof(hidl_memory, mHandle); 48const size_t hidl_memory::kOffsetOfName = offsetof(hidl_memory, mName); 49static_assert(hidl_memory::kOffsetOfHandle == 0, "wrong offset"); 50static_assert(hidl_memory::kOffsetOfName == 24, "wrong offset"); 51 52status_t readEmbeddedFromParcel(const hidl_memory& memory, 53 const Parcel &parcel, size_t parentHandle, size_t parentOffset) { 54 const native_handle_t *handle; 55 ::android::status_t _hidl_err = parcel.readNullableEmbeddedNativeHandle( 56 parentHandle, 57 parentOffset + hidl_memory::kOffsetOfHandle, 58 &handle); 59 60 if (_hidl_err == ::android::OK) { 61 _hidl_err = readEmbeddedFromParcel( 62 memory.name(), 63 parcel, 64 parentHandle, 65 parentOffset + hidl_memory::kOffsetOfName); 66 } 67 68 return _hidl_err; 69} 70 71status_t writeEmbeddedToParcel(const hidl_memory &memory, 72 Parcel *parcel, size_t parentHandle, size_t parentOffset) { 73 status_t _hidl_err = parcel->writeEmbeddedNativeHandle( 74 memory.handle(), 75 parentHandle, 76 parentOffset + hidl_memory::kOffsetOfHandle); 77 78 if (_hidl_err == ::android::OK) { 79 _hidl_err = writeEmbeddedToParcel( 80 memory.name(), 81 parcel, 82 parentHandle, 83 parentOffset + hidl_memory::kOffsetOfName); 84 } 85 86 return _hidl_err; 87} 88// static 89const size_t hidl_string::kOffsetOfBuffer = offsetof(hidl_string, mBuffer); 90static_assert(hidl_string::kOffsetOfBuffer == 0, "wrong offset"); 91 92status_t readEmbeddedFromParcel(const hidl_string &string , 93 const Parcel &parcel, size_t parentHandle, size_t parentOffset) { 94 const void *out; 95 96 status_t status = parcel.readEmbeddedBuffer( 97 string.size() + 1, 98 nullptr /* buffer_handle */, 99 parentHandle, 100 parentOffset + hidl_string::kOffsetOfBuffer, 101 &out); 102 103 if (status != OK) { 104 return status; 105 } 106 107 // Always safe to access out[string.size()] because we read size+1 bytes 108 if (static_cast<const char *>(out)[string.size()] != '\0') { 109 ALOGE("Received unterminated hidl_string buffer."); 110 return BAD_VALUE; 111 } 112 113 return OK; 114} 115 116status_t writeEmbeddedToParcel(const hidl_string &string, 117 Parcel *parcel, size_t parentHandle, size_t parentOffset) { 118 return parcel->writeEmbeddedBuffer( 119 string.c_str(), 120 string.size() + 1, 121 nullptr /* handle */, 122 parentHandle, 123 parentOffset + hidl_string::kOffsetOfBuffer); 124} 125 126android::status_t writeToParcel(const hidl_version &version, android::hardware::Parcel& parcel) { 127 return parcel.writeUint32(static_cast<uint32_t>(version.get_major()) << 16 | version.get_minor()); 128} 129 130hidl_version* readFromParcel(const android::hardware::Parcel& parcel) { 131 uint32_t version; 132 android::status_t status = parcel.readUint32(&version); 133 if (status != OK) { 134 return nullptr; 135 } else { 136 return new hidl_version(version >> 16, version & 0xFFFF); 137 } 138} 139 140status_t readFromParcel(Status *s, const Parcel& parcel) { 141 int32_t exception; 142 status_t status = parcel.readInt32(&exception); 143 if (status != OK) { 144 s->setFromStatusT(status); 145 return status; 146 } 147 148 // Skip over fat response headers. Not used (or propagated) in native code. 149 if (exception == Status::EX_HAS_REPLY_HEADER) { 150 // Note that the header size includes the 4 byte size field. 151 const int32_t header_start = parcel.dataPosition(); 152 int32_t header_size; 153 status = parcel.readInt32(&header_size); 154 if (status != OK) { 155 s->setFromStatusT(status); 156 return status; 157 } 158 parcel.setDataPosition(header_start + header_size); 159 // And fat response headers are currently only used when there are no 160 // exceptions, so act like there was no error. 161 exception = Status::EX_NONE; 162 } 163 164 if (exception == Status::EX_NONE) { 165 *s = Status::ok(); 166 return status; 167 } 168 169 // The remote threw an exception. Get the message back. 170 String16 message; 171 status = parcel.readString16(&message); 172 if (status != OK) { 173 s->setFromStatusT(status); 174 return status; 175 } 176 177 s->setException(exception, String8(message)); 178 179 return status; 180} 181 182status_t writeToParcel(const Status &s, Parcel* parcel) { 183 // Something really bad has happened, and we're not going to even 184 // try returning rich error data. 185 if (s.exceptionCode() == Status::EX_TRANSACTION_FAILED) { 186 return s.transactionError(); 187 } 188 189 status_t status = parcel->writeInt32(s.exceptionCode()); 190 if (status != OK) { return status; } 191 if (s.exceptionCode() == Status::EX_NONE) { 192 // We have no more information to write. 193 return status; 194 } 195 status = parcel->writeString16(String16(s.exceptionMessage())); 196 return status; 197} 198 199void configureBinderRpcThreadpool(size_t maxThreads, bool callerWillJoin) { 200 ProcessState::self()->setThreadPoolConfiguration(maxThreads, callerWillJoin /*callerJoinsPool*/); 201} 202 203void joinBinderRpcThreadpool() { 204 IPCThreadState::self()->joinThreadPool(); 205} 206 207} // namespace hardware 208} // namespace android 209