HidlBinderSupport.cpp revision 9d3eb357a2a3a64baa4824d550b5563b3dc0b15a
17f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong/* 27f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * Copyright (C) 2016 The Android Open Source Project 37f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * 47f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * Licensed under the Apache License, Version 2.0 (the "License"); 57f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * you may not use this file except in compliance with the License. 67f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * You may obtain a copy of the License at 77f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * 87f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * http://www.apache.org/licenses/LICENSE-2.0 97f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * 107f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * Unless required by applicable law or agreed to in writing, software 117f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * distributed under the License is distributed on an "AS IS" BASIS, 127f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 137f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * See the License for the specific language governing permissions and 147f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * limitations under the License. 157f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong */ 167f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 177f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong#define LOG_TAG "HidlSupport" 187f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 197f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong#include <hidl/HidlBinderSupport.h> 207f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 21777bef976bf218a2290b86d52c45dcff84a2f698Yifan Hong// C includes 22777bef976bf218a2290b86d52c45dcff84a2f698Yifan Hong#include <unistd.h> 23777bef976bf218a2290b86d52c45dcff84a2f698Yifan Hong 24777bef976bf218a2290b86d52c45dcff84a2f698Yifan Hong// C++ includes 25777bef976bf218a2290b86d52c45dcff84a2f698Yifan Hong#include <fstream> 26777bef976bf218a2290b86d52c45dcff84a2f698Yifan Hong#include <sstream> 27777bef976bf218a2290b86d52c45dcff84a2f698Yifan Hong 287f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hongnamespace android { 297f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hongnamespace hardware { 307f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 313079100878a2595be644d866e67c12a9de620fd5Martijn Coenenconst size_t hidl_memory::kOffsetOfHandle = offsetof(hidl_memory, mHandle); 323079100878a2595be644d866e67c12a9de620fd5Martijn Coenenconst size_t hidl_memory::kOffsetOfName = offsetof(hidl_memory, mName); 336d4acb12519597610322097f86850d9e404d251aHridya Valsarajustatic_assert(hidl_memory::kOffsetOfHandle == 0, "wrong offset"); 346d4acb12519597610322097f86850d9e404d251aHridya Valsarajustatic_assert(hidl_memory::kOffsetOfName == 24, "wrong offset"); 353079100878a2595be644d866e67c12a9de620fd5Martijn Coenen 369d3eb357a2a3a64baa4824d550b5563b3dc0b15aMartijn Coenenstatus_t readEmbeddedFromParcel(const hidl_memory& memory, 373079100878a2595be644d866e67c12a9de620fd5Martijn Coenen const Parcel &parcel, size_t parentHandle, size_t parentOffset) { 381f535a27054e7553e968cac664981073f0074009Steven Moreland const native_handle_t *handle; 391f535a27054e7553e968cac664981073f0074009Steven Moreland ::android::status_t _hidl_err = parcel.readNullableEmbeddedNativeHandle( 403079100878a2595be644d866e67c12a9de620fd5Martijn Coenen parentHandle, 411f535a27054e7553e968cac664981073f0074009Steven Moreland parentOffset + hidl_memory::kOffsetOfHandle, 421f535a27054e7553e968cac664981073f0074009Steven Moreland &handle); 433079100878a2595be644d866e67c12a9de620fd5Martijn Coenen 441f535a27054e7553e968cac664981073f0074009Steven Moreland if (_hidl_err == ::android::OK) { 451f535a27054e7553e968cac664981073f0074009Steven Moreland _hidl_err = readEmbeddedFromParcel( 469d3eb357a2a3a64baa4824d550b5563b3dc0b15aMartijn Coenen memory.name(), 471f535a27054e7553e968cac664981073f0074009Steven Moreland parcel, 481f535a27054e7553e968cac664981073f0074009Steven Moreland parentHandle, 491f535a27054e7553e968cac664981073f0074009Steven Moreland parentOffset + hidl_memory::kOffsetOfName); 503079100878a2595be644d866e67c12a9de620fd5Martijn Coenen } 513079100878a2595be644d866e67c12a9de620fd5Martijn Coenen 523079100878a2595be644d866e67c12a9de620fd5Martijn Coenen return _hidl_err; 533079100878a2595be644d866e67c12a9de620fd5Martijn Coenen} 543079100878a2595be644d866e67c12a9de620fd5Martijn Coenen 553079100878a2595be644d866e67c12a9de620fd5Martijn Coenenstatus_t writeEmbeddedToParcel(const hidl_memory &memory, 563079100878a2595be644d866e67c12a9de620fd5Martijn Coenen Parcel *parcel, size_t parentHandle, size_t parentOffset) { 573079100878a2595be644d866e67c12a9de620fd5Martijn Coenen status_t _hidl_err = parcel->writeEmbeddedNativeHandle( 583079100878a2595be644d866e67c12a9de620fd5Martijn Coenen memory.handle(), 593079100878a2595be644d866e67c12a9de620fd5Martijn Coenen parentHandle, 603079100878a2595be644d866e67c12a9de620fd5Martijn Coenen parentOffset + hidl_memory::kOffsetOfHandle); 613079100878a2595be644d866e67c12a9de620fd5Martijn Coenen 623079100878a2595be644d866e67c12a9de620fd5Martijn Coenen if (_hidl_err == ::android::OK) { 633079100878a2595be644d866e67c12a9de620fd5Martijn Coenen _hidl_err = writeEmbeddedToParcel( 643079100878a2595be644d866e67c12a9de620fd5Martijn Coenen memory.name(), 653079100878a2595be644d866e67c12a9de620fd5Martijn Coenen parcel, 663079100878a2595be644d866e67c12a9de620fd5Martijn Coenen parentHandle, 673079100878a2595be644d866e67c12a9de620fd5Martijn Coenen parentOffset + hidl_memory::kOffsetOfName); 683079100878a2595be644d866e67c12a9de620fd5Martijn Coenen } 693079100878a2595be644d866e67c12a9de620fd5Martijn Coenen 703079100878a2595be644d866e67c12a9de620fd5Martijn Coenen return _hidl_err; 713079100878a2595be644d866e67c12a9de620fd5Martijn Coenen} 727f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong// static 737f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hongconst size_t hidl_string::kOffsetOfBuffer = offsetof(hidl_string, mBuffer); 746d4acb12519597610322097f86850d9e404d251aHridya Valsarajustatic_assert(hidl_string::kOffsetOfBuffer == 0, "wrong offset"); 757f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 769d3eb357a2a3a64baa4824d550b5563b3dc0b15aMartijn Coenenstatus_t readEmbeddedFromParcel(const hidl_string &string , 777f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong const Parcel &parcel, size_t parentHandle, size_t parentOffset) { 781f535a27054e7553e968cac664981073f0074009Steven Moreland const void *out; 799d3eb357a2a3a64baa4824d550b5563b3dc0b15aMartijn Coenen 809d3eb357a2a3a64baa4824d550b5563b3dc0b15aMartijn Coenen status_t status = parcel.readEmbeddedBuffer( 819d3eb357a2a3a64baa4824d550b5563b3dc0b15aMartijn Coenen string.size() + 1, 827f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong nullptr /* buffer_handle */, 837f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong parentHandle, 841f535a27054e7553e968cac664981073f0074009Steven Moreland parentOffset + hidl_string::kOffsetOfBuffer, 851f535a27054e7553e968cac664981073f0074009Steven Moreland &out); 869d3eb357a2a3a64baa4824d550b5563b3dc0b15aMartijn Coenen 879d3eb357a2a3a64baa4824d550b5563b3dc0b15aMartijn Coenen if (status != OK) { 889d3eb357a2a3a64baa4824d550b5563b3dc0b15aMartijn Coenen return status; 899d3eb357a2a3a64baa4824d550b5563b3dc0b15aMartijn Coenen } 909d3eb357a2a3a64baa4824d550b5563b3dc0b15aMartijn Coenen 919d3eb357a2a3a64baa4824d550b5563b3dc0b15aMartijn Coenen // Always safe to access out[string.size()] because we read size+1 bytes 929d3eb357a2a3a64baa4824d550b5563b3dc0b15aMartijn Coenen if (static_cast<const char *>(out)[string.size()] != '\0') { 939d3eb357a2a3a64baa4824d550b5563b3dc0b15aMartijn Coenen ALOGE("Received unterminated hidl_string buffer."); 949d3eb357a2a3a64baa4824d550b5563b3dc0b15aMartijn Coenen return BAD_VALUE; 959d3eb357a2a3a64baa4824d550b5563b3dc0b15aMartijn Coenen } 969d3eb357a2a3a64baa4824d550b5563b3dc0b15aMartijn Coenen 979d3eb357a2a3a64baa4824d550b5563b3dc0b15aMartijn Coenen return OK; 987f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} 997f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1007f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hongstatus_t writeEmbeddedToParcel(const hidl_string &string, 1017f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong Parcel *parcel, size_t parentHandle, size_t parentOffset) { 1027f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return parcel->writeEmbeddedBuffer( 1037f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong string.c_str(), 1047f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong string.size() + 1, 1057f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong nullptr /* handle */, 1067f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong parentHandle, 1077f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong parentOffset + hidl_string::kOffsetOfBuffer); 1087f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} 1097f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1107f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hongandroid::status_t writeToParcel(const hidl_version &version, android::hardware::Parcel& parcel) { 1117f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return parcel.writeUint32(static_cast<uint32_t>(version.get_major()) << 16 | version.get_minor()); 1127f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} 1137f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1147f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Honghidl_version* readFromParcel(const android::hardware::Parcel& parcel) { 1157f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong uint32_t version; 1167f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong android::status_t status = parcel.readUint32(&version); 1177f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (status != OK) { 1187f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return nullptr; 1197f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } else { 1207f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return new hidl_version(version >> 16, version & 0xFFFF); 1217f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1227f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} 1237f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1247f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hongstatus_t readFromParcel(Status *s, const Parcel& parcel) { 1257f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong int32_t exception; 1267f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong status_t status = parcel.readInt32(&exception); 1277f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (status != OK) { 1287f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong s->setFromStatusT(status); 1297f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 1307f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1317f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1327f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // Skip over fat response headers. Not used (or propagated) in native code. 1337f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (exception == Status::EX_HAS_REPLY_HEADER) { 1347f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // Note that the header size includes the 4 byte size field. 1357f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong const int32_t header_start = parcel.dataPosition(); 1367f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong int32_t header_size; 1377f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong status = parcel.readInt32(&header_size); 1387f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (status != OK) { 1397f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong s->setFromStatusT(status); 1407f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 1417f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1427f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong parcel.setDataPosition(header_start + header_size); 1437f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // And fat response headers are currently only used when there are no 1447f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // exceptions, so act like there was no error. 1457f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong exception = Status::EX_NONE; 1467f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1477f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1487f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (exception == Status::EX_NONE) { 1497f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong *s = Status::ok(); 1507f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 1517f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1527f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1537f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // The remote threw an exception. Get the message back. 1547f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong String16 message; 1557f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong status = parcel.readString16(&message); 1567f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (status != OK) { 1577f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong s->setFromStatusT(status); 1587f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 1597f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1607f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 16172db40f4a612d04187ae2fc1f9a3766933264bdfSteven Moreland s->setException(exception, String8(message)); 1627f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1637f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 1647f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} 1657f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1667f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hongstatus_t writeToParcel(const Status &s, Parcel* parcel) { 1677f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // Something really bad has happened, and we're not going to even 1687f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // try returning rich error data. 1697f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (s.exceptionCode() == Status::EX_TRANSACTION_FAILED) { 1707f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return s.transactionError(); 1717f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1727f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1737f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong status_t status = parcel->writeInt32(s.exceptionCode()); 1747f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (status != OK) { return status; } 1757f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (s.exceptionCode() == Status::EX_NONE) { 1767f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // We have no more information to write. 1777f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 1787f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1797f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong status = parcel->writeString16(String16(s.exceptionMessage())); 1807f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 1817f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} 1827f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1836cf8fa2d989bf57aed9a62fd9f54261176a9f860Steven Morelandvoid configureBinderRpcThreadpool(size_t maxThreads, bool callerWillJoin) { 1846cf8fa2d989bf57aed9a62fd9f54261176a9f860Steven Moreland ProcessState::self()->setThreadPoolConfiguration(maxThreads, callerWillJoin /*callerJoinsPool*/); 1856cf8fa2d989bf57aed9a62fd9f54261176a9f860Steven Moreland} 1866cf8fa2d989bf57aed9a62fd9f54261176a9f860Steven Moreland 1876cf8fa2d989bf57aed9a62fd9f54261176a9f860Steven Morelandvoid joinBinderRpcThreadpool() { 1886cf8fa2d989bf57aed9a62fd9f54261176a9f860Steven Moreland IPCThreadState::self()->joinThreadPool(); 1896cf8fa2d989bf57aed9a62fd9f54261176a9f860Steven Moreland} 1906cf8fa2d989bf57aed9a62fd9f54261176a9f860Steven Moreland 1917f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} // namespace hardware 1927f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} // namespace android 193