1/* 2 * Copyright (C) 2005 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 <binder/Binder.h> 18 19#include <utils/Atomic.h> 20#include <utils/misc.h> 21#include <binder/BpBinder.h> 22#include <binder/IInterface.h> 23#include <binder/Parcel.h> 24 25#include <stdio.h> 26 27namespace android { 28 29// --------------------------------------------------------------------------- 30 31IBinder::IBinder() 32 : RefBase() 33{ 34} 35 36IBinder::~IBinder() 37{ 38} 39 40// --------------------------------------------------------------------------- 41 42sp<IInterface> IBinder::queryLocalInterface(const String16& descriptor) 43{ 44 return NULL; 45} 46 47BBinder* IBinder::localBinder() 48{ 49 return NULL; 50} 51 52BpBinder* IBinder::remoteBinder() 53{ 54 return NULL; 55} 56 57bool IBinder::checkSubclass(const void* /*subclassID*/) const 58{ 59 return false; 60} 61 62// --------------------------------------------------------------------------- 63 64class BBinder::Extras 65{ 66public: 67 Mutex mLock; 68 BpBinder::ObjectManager mObjects; 69}; 70 71// --------------------------------------------------------------------------- 72 73BBinder::BBinder() 74 : mExtras(NULL) 75{ 76} 77 78bool BBinder::isBinderAlive() const 79{ 80 return true; 81} 82 83status_t BBinder::pingBinder() 84{ 85 return NO_ERROR; 86} 87 88const String16& BBinder::getInterfaceDescriptor() const 89{ 90 // This is a local static rather than a global static, 91 // to avoid static initializer ordering issues. 92 static String16 sEmptyDescriptor; 93 ALOGW("reached BBinder::getInterfaceDescriptor (this=%p)", this); 94 return sEmptyDescriptor; 95} 96 97status_t BBinder::transact( 98 uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags) 99{ 100 data.setDataPosition(0); 101 102 status_t err = NO_ERROR; 103 switch (code) { 104 case PING_TRANSACTION: 105 reply->writeInt32(pingBinder()); 106 break; 107 default: 108 err = onTransact(code, data, reply, flags); 109 break; 110 } 111 112 if (reply != NULL) { 113 reply->setDataPosition(0); 114 } 115 116 return err; 117} 118 119status_t BBinder::linkToDeath( 120 const sp<DeathRecipient>& recipient, void* cookie, uint32_t flags) 121{ 122 return INVALID_OPERATION; 123} 124 125status_t BBinder::unlinkToDeath( 126 const wp<DeathRecipient>& recipient, void* cookie, uint32_t flags, 127 wp<DeathRecipient>* outRecipient) 128{ 129 return INVALID_OPERATION; 130} 131 132status_t BBinder::dump(int fd, const Vector<String16>& args) 133{ 134 return NO_ERROR; 135} 136 137void BBinder::attachObject( 138 const void* objectID, void* object, void* cleanupCookie, 139 object_cleanup_func func) 140{ 141 Extras* e = mExtras; 142 143 if (!e) { 144 e = new Extras; 145 if (android_atomic_cmpxchg(0, reinterpret_cast<int32_t>(e), 146 reinterpret_cast<volatile int32_t*>(&mExtras)) != 0) { 147 delete e; 148 e = mExtras; 149 } 150 if (e == 0) return; // out of memory 151 } 152 153 AutoMutex _l(e->mLock); 154 e->mObjects.attach(objectID, object, cleanupCookie, func); 155} 156 157void* BBinder::findObject(const void* objectID) const 158{ 159 Extras* e = mExtras; 160 if (!e) return NULL; 161 162 AutoMutex _l(e->mLock); 163 return e->mObjects.find(objectID); 164} 165 166void BBinder::detachObject(const void* objectID) 167{ 168 Extras* e = mExtras; 169 if (!e) return; 170 171 AutoMutex _l(e->mLock); 172 e->mObjects.detach(objectID); 173} 174 175BBinder* BBinder::localBinder() 176{ 177 return this; 178} 179 180BBinder::~BBinder() 181{ 182 if (mExtras) delete mExtras; 183} 184 185 186status_t BBinder::onTransact( 187 uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags) 188{ 189 switch (code) { 190 case INTERFACE_TRANSACTION: 191 reply->writeString16(getInterfaceDescriptor()); 192 return NO_ERROR; 193 194 case DUMP_TRANSACTION: { 195 int fd = data.readFileDescriptor(); 196 int argc = data.readInt32(); 197 Vector<String16> args; 198 for (int i = 0; i < argc && data.dataAvail() > 0; i++) { 199 args.add(data.readString16()); 200 } 201 return dump(fd, args); 202 } 203 204 case SYSPROPS_TRANSACTION: { 205 report_sysprop_change(); 206 return NO_ERROR; 207 } 208 209 default: 210 return UNKNOWN_TRANSACTION; 211 } 212} 213 214// --------------------------------------------------------------------------- 215 216enum { 217 // This is used to transfer ownership of the remote binder from 218 // the BpRefBase object holding it (when it is constructed), to the 219 // owner of the BpRefBase object when it first acquires that BpRefBase. 220 kRemoteAcquired = 0x00000001 221}; 222 223BpRefBase::BpRefBase(const sp<IBinder>& o) 224 : mRemote(o.get()), mRefs(NULL), mState(0) 225{ 226 extendObjectLifetime(OBJECT_LIFETIME_WEAK); 227 228 if (mRemote) { 229 mRemote->incStrong(this); // Removed on first IncStrong(). 230 mRefs = mRemote->createWeak(this); // Held for our entire lifetime. 231 } 232} 233 234BpRefBase::~BpRefBase() 235{ 236 if (mRemote) { 237 if (!(mState&kRemoteAcquired)) { 238 mRemote->decStrong(this); 239 } 240 mRefs->decWeak(this); 241 } 242} 243 244void BpRefBase::onFirstRef() 245{ 246 android_atomic_or(kRemoteAcquired, &mState); 247} 248 249void BpRefBase::onLastStrongRef(const void* id) 250{ 251 if (mRemote) { 252 mRemote->decStrong(this); 253 } 254} 255 256bool BpRefBase::onIncStrongAttempted(uint32_t flags, const void* id) 257{ 258 return mRemote ? mRefs->attemptIncStrong(this) : false; 259} 260 261// --------------------------------------------------------------------------- 262 263}; // namespace android 264