Steven Moreland | 2e87adc | 2018-08-20 19:47:00 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2018 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 | #include <android-base/logging.h> |
| 18 | #include <android/binder_manager.h> |
| 19 | #include <iface/iface.h> |
| 20 | |
| 21 | using ::android::sp; |
| 22 | using ::android::wp; |
| 23 | |
| 24 | const char* IFoo::kSomeInstanceName = "libbinder_ndk-test-IFoo"; |
| 25 | const char* kIFooDescriptor = "my-special-IFoo-class"; |
| 26 | |
| 27 | struct IFoo_Class_Data { |
| 28 | sp<IFoo> foo; |
| 29 | }; |
| 30 | |
| 31 | void* IFoo_Class_onCreate(void* args) { |
| 32 | IFoo_Class_Data* foo = static_cast<IFoo_Class_Data*>(args); |
| 33 | // This is a foo, but we're currently not verifying that. So, the method newLocalBinder is |
| 34 | // coupled with this. |
| 35 | return static_cast<void*>(foo); |
| 36 | } |
| 37 | |
| 38 | void IFoo_Class_onDestroy(void* userData) { |
| 39 | delete static_cast<IFoo_Class_Data*>(userData); |
| 40 | } |
| 41 | |
| 42 | binder_status_t IFoo_Class_onTransact(AIBinder* binder, transaction_code_t code, const AParcel* in, |
| 43 | AParcel* out) { |
Steven Moreland | 5d62e44 | 2018-09-13 15:01:02 -0700 | [diff] [blame] | 44 | binder_status_t stat = STATUS_FAILED_TRANSACTION; |
Steven Moreland | 2e87adc | 2018-08-20 19:47:00 -0700 | [diff] [blame] | 45 | |
| 46 | sp<IFoo> foo = static_cast<IFoo_Class_Data*>(AIBinder_getUserData(binder))->foo; |
| 47 | CHECK(foo != nullptr) << "Transaction made on already deleted object"; |
| 48 | |
| 49 | switch (code) { |
| 50 | case IFoo::DOFOO: { |
| 51 | int32_t valueIn; |
| 52 | stat = AParcel_readInt32(in, &valueIn); |
Steven Moreland | 5d62e44 | 2018-09-13 15:01:02 -0700 | [diff] [blame] | 53 | if (stat != STATUS_OK) break; |
Steven Moreland | 2e87adc | 2018-08-20 19:47:00 -0700 | [diff] [blame] | 54 | int32_t valueOut = foo->doubleNumber(valueIn); |
| 55 | stat = AParcel_writeInt32(out, valueOut); |
| 56 | break; |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | return stat; |
| 61 | } |
| 62 | |
| 63 | AIBinder_Class* IFoo::kClass = AIBinder_Class_define(kIFooDescriptor, IFoo_Class_onCreate, |
| 64 | IFoo_Class_onDestroy, IFoo_Class_onTransact); |
| 65 | |
| 66 | class BpFoo : public IFoo { |
| 67 | public: |
| 68 | BpFoo(AIBinder* binder) : mBinder(binder) {} |
| 69 | virtual ~BpFoo() { AIBinder_decStrong(mBinder); } |
| 70 | |
| 71 | virtual int32_t doubleNumber(int32_t in) { |
| 72 | AParcel* parcelIn; |
Steven Moreland | 5d62e44 | 2018-09-13 15:01:02 -0700 | [diff] [blame] | 73 | CHECK(STATUS_OK == AIBinder_prepareTransaction(mBinder, &parcelIn)); |
Steven Moreland | 2e87adc | 2018-08-20 19:47:00 -0700 | [diff] [blame] | 74 | |
Steven Moreland | 5d62e44 | 2018-09-13 15:01:02 -0700 | [diff] [blame] | 75 | CHECK(STATUS_OK == AParcel_writeInt32(parcelIn, in)); |
Steven Moreland | 2e87adc | 2018-08-20 19:47:00 -0700 | [diff] [blame] | 76 | |
| 77 | AParcel* parcelOut; |
Steven Moreland | 5d62e44 | 2018-09-13 15:01:02 -0700 | [diff] [blame] | 78 | CHECK(STATUS_OK == |
Steven Moreland | 2e87adc | 2018-08-20 19:47:00 -0700 | [diff] [blame] | 79 | AIBinder_transact(mBinder, IFoo::DOFOO, &parcelIn, &parcelOut, 0 /*flags*/)); |
| 80 | |
| 81 | int32_t out; |
Steven Moreland | 5d62e44 | 2018-09-13 15:01:02 -0700 | [diff] [blame] | 82 | CHECK(STATUS_OK == AParcel_readInt32(parcelOut, &out)); |
Steven Moreland | 2e87adc | 2018-08-20 19:47:00 -0700 | [diff] [blame] | 83 | |
Steven Moreland | caa776c | 2018-09-04 13:48:11 -0700 | [diff] [blame] | 84 | AParcel_delete(&parcelOut); |
| 85 | |
Steven Moreland | 2e87adc | 2018-08-20 19:47:00 -0700 | [diff] [blame] | 86 | return out; |
| 87 | } |
| 88 | |
| 89 | private: |
| 90 | // Always assumes one refcount |
| 91 | AIBinder* mBinder; |
| 92 | }; |
| 93 | |
| 94 | IFoo::~IFoo() { |
Steven Moreland | 5ccb70f | 2018-09-04 16:30:21 -0700 | [diff] [blame] | 95 | AIBinder_Weak_delete(&mWeakBinder); |
Steven Moreland | 2e87adc | 2018-08-20 19:47:00 -0700 | [diff] [blame] | 96 | } |
| 97 | |
| 98 | binder_status_t IFoo::addService(const char* instance) { |
| 99 | AIBinder* binder = nullptr; |
| 100 | |
| 101 | if (mWeakBinder != nullptr) { |
| 102 | // one strong ref count of binder |
| 103 | binder = AIBinder_Weak_promote(mWeakBinder); |
| 104 | } |
| 105 | if (binder == nullptr) { |
| 106 | // or one strong refcount here |
| 107 | binder = AIBinder_new(IFoo::kClass, static_cast<void*>(new IFoo_Class_Data{this})); |
| 108 | if (mWeakBinder != nullptr) { |
Steven Moreland | 5ccb70f | 2018-09-04 16:30:21 -0700 | [diff] [blame] | 109 | AIBinder_Weak_delete(&mWeakBinder); |
Steven Moreland | 2e87adc | 2018-08-20 19:47:00 -0700 | [diff] [blame] | 110 | } |
| 111 | mWeakBinder = AIBinder_Weak_new(binder); |
| 112 | } |
| 113 | |
| 114 | binder_status_t status = AServiceManager_addService(binder, instance); |
| 115 | // Strong references we care about kept by remote process |
| 116 | AIBinder_decStrong(binder); |
| 117 | return status; |
| 118 | } |
| 119 | |
| 120 | sp<IFoo> IFoo::getService(const char* instance) { |
| 121 | AIBinder* binder = AServiceManager_getService(instance); // maybe nullptr |
Steven Moreland | 2e87adc | 2018-08-20 19:47:00 -0700 | [diff] [blame] | 122 | if (binder == nullptr) { |
| 123 | return nullptr; |
| 124 | } |
| 125 | |
Steven Moreland | 71cddc3 | 2018-08-30 23:39:22 -0700 | [diff] [blame] | 126 | if (!AIBinder_associateClass(binder, IFoo::kClass)) { |
| 127 | AIBinder_decStrong(binder); |
| 128 | return nullptr; |
| 129 | } |
| 130 | |
Steven Moreland | 2e87adc | 2018-08-20 19:47:00 -0700 | [diff] [blame] | 131 | if (AIBinder_isRemote(binder)) { |
| 132 | sp<IFoo> ret = new BpFoo(binder); // takes ownership of binder |
| 133 | return ret; |
| 134 | } |
| 135 | |
| 136 | IFoo_Class_Data* data = static_cast<IFoo_Class_Data*>(AIBinder_getUserData(binder)); |
| 137 | |
| 138 | CHECK(data != nullptr); // always created with non-null data |
| 139 | |
| 140 | sp<IFoo> ret = data->foo; |
| 141 | |
| 142 | AIBinder* held = AIBinder_Weak_promote(ret->mWeakBinder); |
| 143 | CHECK(held == binder); |
| 144 | AIBinder_decStrong(held); |
| 145 | |
| 146 | // IFoo only keeps a weak reference to AIBinder, so we can drop this |
| 147 | AIBinder_decStrong(binder); |
| 148 | return ret; |
| 149 | } |