The Android Open Source Project | 7c1b96a | 2008-10-21 07:00:00 -0700 | [diff] [blame^] | 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 | #define LOG_TAG "BpBinder" |
| 18 | //#define LOG_NDEBUG 0 |
| 19 | |
| 20 | #include <utils/BpBinder.h> |
| 21 | |
| 22 | #include <utils/IPCThreadState.h> |
| 23 | #include <utils/Log.h> |
| 24 | |
| 25 | #include <stdio.h> |
| 26 | |
| 27 | //#undef LOGV |
| 28 | //#define LOGV(...) fprintf(stderr, __VA_ARGS__) |
| 29 | |
| 30 | namespace android { |
| 31 | |
| 32 | // --------------------------------------------------------------------------- |
| 33 | |
| 34 | BpBinder::ObjectManager::ObjectManager() |
| 35 | { |
| 36 | } |
| 37 | |
| 38 | BpBinder::ObjectManager::~ObjectManager() |
| 39 | { |
| 40 | kill(); |
| 41 | } |
| 42 | |
| 43 | void BpBinder::ObjectManager::attach( |
| 44 | const void* objectID, void* object, void* cleanupCookie, |
| 45 | IBinder::object_cleanup_func func) |
| 46 | { |
| 47 | entry_t e; |
| 48 | e.object = object; |
| 49 | e.cleanupCookie = cleanupCookie; |
| 50 | e.func = func; |
| 51 | |
| 52 | if (mObjects.indexOfKey(objectID) >= 0) { |
| 53 | LOGE("Trying to attach object ID %p to binder ObjectManager %p with object %p, but object ID already in use", |
| 54 | objectID, this, object); |
| 55 | return; |
| 56 | } |
| 57 | |
| 58 | mObjects.add(objectID, e); |
| 59 | } |
| 60 | |
| 61 | void* BpBinder::ObjectManager::find(const void* objectID) const |
| 62 | { |
| 63 | const ssize_t i = mObjects.indexOfKey(objectID); |
| 64 | if (i < 0) return NULL; |
| 65 | return mObjects.valueAt(i).object; |
| 66 | } |
| 67 | |
| 68 | void BpBinder::ObjectManager::detach(const void* objectID) |
| 69 | { |
| 70 | mObjects.removeItem(objectID); |
| 71 | } |
| 72 | |
| 73 | void BpBinder::ObjectManager::kill() |
| 74 | { |
| 75 | const size_t N = mObjects.size(); |
| 76 | LOGV("Killing %d objects in manager %p", N, this); |
| 77 | for (size_t i=0; i<N; i++) { |
| 78 | const entry_t& e = mObjects.valueAt(i); |
| 79 | if (e.func != NULL) { |
| 80 | e.func(mObjects.keyAt(i), e.object, e.cleanupCookie); |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | mObjects.clear(); |
| 85 | } |
| 86 | |
| 87 | // --------------------------------------------------------------------------- |
| 88 | |
| 89 | BpBinder::BpBinder(int32_t handle) |
| 90 | : mHandle(handle) |
| 91 | , mAlive(1) |
| 92 | , mObitsSent(0) |
| 93 | , mObituaries(NULL) |
| 94 | { |
| 95 | LOGV("Creating BpBinder %p handle %d\n", this, mHandle); |
| 96 | |
| 97 | extendObjectLifetime(OBJECT_LIFETIME_WEAK); |
| 98 | IPCThreadState::self()->incWeakHandle(handle); |
| 99 | } |
| 100 | |
| 101 | String16 BpBinder::getInterfaceDescriptor() const |
| 102 | { |
| 103 | String16 res; |
| 104 | Parcel send, reply; |
| 105 | status_t err = const_cast<BpBinder*>(this)->transact( |
| 106 | INTERFACE_TRANSACTION, send, &reply); |
| 107 | if (err == NO_ERROR) { |
| 108 | res = reply.readString16(); |
| 109 | } |
| 110 | return res; |
| 111 | } |
| 112 | |
| 113 | bool BpBinder::isBinderAlive() const |
| 114 | { |
| 115 | return mAlive != 0; |
| 116 | } |
| 117 | |
| 118 | status_t BpBinder::pingBinder() |
| 119 | { |
| 120 | Parcel send; |
| 121 | Parcel reply; |
| 122 | status_t err = transact(PING_TRANSACTION, send, &reply); |
| 123 | if (err != NO_ERROR) return err; |
| 124 | if (reply.dataSize() < sizeof(status_t)) return NOT_ENOUGH_DATA; |
| 125 | return (status_t)reply.readInt32(); |
| 126 | } |
| 127 | |
| 128 | status_t BpBinder::dump(int fd, const Vector<String16>& args) |
| 129 | { |
| 130 | Parcel send; |
| 131 | Parcel reply; |
| 132 | send.writeFileDescriptor(fd); |
| 133 | const size_t numArgs = args.size(); |
| 134 | send.writeInt32(numArgs); |
| 135 | for (size_t i = 0; i < numArgs; i++) { |
| 136 | send.writeString16(args[i]); |
| 137 | } |
| 138 | status_t err = transact(DUMP_TRANSACTION, send, &reply); |
| 139 | return err; |
| 140 | } |
| 141 | |
| 142 | status_t BpBinder::transact( |
| 143 | uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags) |
| 144 | { |
| 145 | // Once a binder has died, it will never come back to life. |
| 146 | if (mAlive) { |
| 147 | status_t status = IPCThreadState::self()->transact( |
| 148 | mHandle, code, data, reply, flags); |
| 149 | if (status == DEAD_OBJECT) mAlive = 0; |
| 150 | return status; |
| 151 | } |
| 152 | |
| 153 | return DEAD_OBJECT; |
| 154 | } |
| 155 | |
| 156 | status_t BpBinder::linkToDeath( |
| 157 | const sp<DeathRecipient>& recipient, void* cookie, uint32_t flags) |
| 158 | { |
| 159 | Obituary ob; |
| 160 | ob.recipient = recipient; |
| 161 | ob.cookie = cookie; |
| 162 | ob.flags = flags; |
| 163 | |
| 164 | LOG_ALWAYS_FATAL_IF(recipient == NULL, |
| 165 | "linkToDeath(): recipient must be non-NULL"); |
| 166 | |
| 167 | { |
| 168 | AutoMutex _l(mLock); |
| 169 | |
| 170 | if (!mObitsSent) { |
| 171 | if (!mObituaries) { |
| 172 | mObituaries = new Vector<Obituary>; |
| 173 | if (!mObituaries) { |
| 174 | return NO_MEMORY; |
| 175 | } |
| 176 | LOGV("Requesting death notification: %p handle %d\n", this, mHandle); |
| 177 | getWeakRefs()->incWeak(this); |
| 178 | IPCThreadState* self = IPCThreadState::self(); |
| 179 | self->requestDeathNotification(mHandle, this); |
| 180 | self->flushCommands(); |
| 181 | } |
| 182 | ssize_t res = mObituaries->add(ob); |
| 183 | return res >= (ssize_t)NO_ERROR ? (status_t)NO_ERROR : res; |
| 184 | } |
| 185 | } |
| 186 | |
| 187 | return DEAD_OBJECT; |
| 188 | } |
| 189 | |
| 190 | status_t BpBinder::unlinkToDeath( |
| 191 | const wp<DeathRecipient>& recipient, void* cookie, uint32_t flags, |
| 192 | wp<DeathRecipient>* outRecipient) |
| 193 | { |
| 194 | AutoMutex _l(mLock); |
| 195 | |
| 196 | if (mObitsSent) { |
| 197 | return DEAD_OBJECT; |
| 198 | } |
| 199 | |
| 200 | const size_t N = mObituaries ? mObituaries->size() : 0; |
| 201 | for (size_t i=0; i<N; i++) { |
| 202 | const Obituary& obit = mObituaries->itemAt(i); |
| 203 | if ((obit.recipient == recipient |
| 204 | || (recipient == NULL && obit.cookie == cookie)) |
| 205 | && obit.flags == flags) { |
| 206 | const uint32_t allFlags = obit.flags|flags; |
| 207 | if (outRecipient != NULL) { |
| 208 | *outRecipient = mObituaries->itemAt(i).recipient; |
| 209 | } |
| 210 | mObituaries->removeAt(i); |
| 211 | if (mObituaries->size() == 0) { |
| 212 | LOGV("Clearing death notification: %p handle %d\n", this, mHandle); |
| 213 | IPCThreadState* self = IPCThreadState::self(); |
| 214 | self->clearDeathNotification(mHandle, this); |
| 215 | self->flushCommands(); |
| 216 | delete mObituaries; |
| 217 | mObituaries = NULL; |
| 218 | } |
| 219 | return NO_ERROR; |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | return NAME_NOT_FOUND; |
| 224 | } |
| 225 | |
| 226 | void BpBinder::sendObituary() |
| 227 | { |
| 228 | LOGV("Sending obituary for proxy %p handle %d, mObitsSent=%s\n", |
| 229 | this, mHandle, mObitsSent ? "true" : "false"); |
| 230 | |
| 231 | mAlive = 0; |
| 232 | if (mObitsSent) return; |
| 233 | |
| 234 | mLock.lock(); |
| 235 | Vector<Obituary>* obits = mObituaries; |
| 236 | if(obits != NULL) { |
| 237 | LOGV("Clearing sent death notification: %p handle %d\n", this, mHandle); |
| 238 | IPCThreadState* self = IPCThreadState::self(); |
| 239 | self->clearDeathNotification(mHandle, this); |
| 240 | self->flushCommands(); |
| 241 | mObituaries = NULL; |
| 242 | } |
| 243 | mObitsSent = 1; |
| 244 | mLock.unlock(); |
| 245 | |
| 246 | LOGV("Reporting death of proxy %p for %d recipients\n", |
| 247 | this, obits ? obits->size() : 0); |
| 248 | |
| 249 | if (obits != NULL) { |
| 250 | const size_t N = obits->size(); |
| 251 | for (size_t i=0; i<N; i++) { |
| 252 | reportOneDeath(obits->itemAt(i)); |
| 253 | } |
| 254 | |
| 255 | delete obits; |
| 256 | } |
| 257 | } |
| 258 | |
| 259 | void BpBinder::reportOneDeath(const Obituary& obit) |
| 260 | { |
| 261 | sp<DeathRecipient> recipient = obit.recipient.promote(); |
| 262 | LOGV("Reporting death to recipient: %p\n", recipient.get()); |
| 263 | if (recipient == NULL) return; |
| 264 | |
| 265 | recipient->binderDied(this); |
| 266 | } |
| 267 | |
| 268 | |
| 269 | void BpBinder::attachObject( |
| 270 | const void* objectID, void* object, void* cleanupCookie, |
| 271 | object_cleanup_func func) |
| 272 | { |
| 273 | AutoMutex _l(mLock); |
| 274 | LOGV("Attaching object %p to binder %p (manager=%p)", object, this, &mObjects); |
| 275 | mObjects.attach(objectID, object, cleanupCookie, func); |
| 276 | } |
| 277 | |
| 278 | void* BpBinder::findObject(const void* objectID) const |
| 279 | { |
| 280 | AutoMutex _l(mLock); |
| 281 | return mObjects.find(objectID); |
| 282 | } |
| 283 | |
| 284 | void BpBinder::detachObject(const void* objectID) |
| 285 | { |
| 286 | AutoMutex _l(mLock); |
| 287 | mObjects.detach(objectID); |
| 288 | } |
| 289 | |
| 290 | BpBinder* BpBinder::remoteBinder() |
| 291 | { |
| 292 | return this; |
| 293 | } |
| 294 | |
| 295 | BpBinder::~BpBinder() |
| 296 | { |
| 297 | LOGV("Destroying BpBinder %p handle %d\n", this, mHandle); |
| 298 | |
| 299 | IPCThreadState* ipc = IPCThreadState::self(); |
| 300 | |
| 301 | mLock.lock(); |
| 302 | Vector<Obituary>* obits = mObituaries; |
| 303 | if(obits != NULL) { |
| 304 | if (ipc) ipc->clearDeathNotification(mHandle, this); |
| 305 | mObituaries = NULL; |
| 306 | } |
| 307 | mLock.unlock(); |
| 308 | |
| 309 | if (obits != NULL) { |
| 310 | // XXX Should we tell any remaining DeathRecipient |
| 311 | // objects that the last strong ref has gone away, so they |
| 312 | // are no longer linked? |
| 313 | delete obits; |
| 314 | } |
| 315 | |
| 316 | if (ipc) { |
| 317 | ipc->expungeHandle(mHandle, this); |
| 318 | ipc->decWeakHandle(mHandle); |
| 319 | } |
| 320 | } |
| 321 | |
| 322 | void BpBinder::onFirstRef() |
| 323 | { |
| 324 | LOGV("onFirstRef BpBinder %p handle %d\n", this, mHandle); |
| 325 | IPCThreadState* ipc = IPCThreadState::self(); |
| 326 | if (ipc) ipc->incStrongHandle(mHandle); |
| 327 | } |
| 328 | |
| 329 | void BpBinder::onLastStrongRef(const void* id) |
| 330 | { |
| 331 | LOGV("onLastStrongRef BpBinder %p handle %d\n", this, mHandle); |
| 332 | IF_LOGV() { |
| 333 | printRefs(); |
| 334 | } |
| 335 | IPCThreadState* ipc = IPCThreadState::self(); |
| 336 | if (ipc) ipc->decStrongHandle(mHandle); |
| 337 | } |
| 338 | |
| 339 | bool BpBinder::onIncStrongAttempted(uint32_t flags, const void* id) |
| 340 | { |
| 341 | LOGV("onIncStrongAttempted BpBinder %p handle %d\n", this, mHandle); |
| 342 | IPCThreadState* ipc = IPCThreadState::self(); |
| 343 | return ipc ? ipc->attemptIncStrongHandle(mHandle) == NO_ERROR : false; |
| 344 | } |
| 345 | |
| 346 | // --------------------------------------------------------------------------- |
| 347 | |
| 348 | }; // namespace android |