BpBinder.cpp revision 208059f67ed2dd9fa025e07fcb6954d3cb61c79e 
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
30namespace android {
31
32// ---------------------------------------------------------------------------
33
34BpBinder::ObjectManager::ObjectManager()
35{
36}
37
38BpBinder::ObjectManager::~ObjectManager()
39{
40    kill();
41}
42
43void 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
61void* 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
68void BpBinder::ObjectManager::detach(const void* objectID)
69{
70    mObjects.removeItem(objectID);
71}
72
73void 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
89BpBinder::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
101String16 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
113bool BpBinder::isBinderAlive() const
114{
115    return mAlive != 0;
116}
117
118status_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
128status_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
142status_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
156status_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
190status_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
226void 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
259void 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
269void 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
278void* BpBinder::findObject(const void* objectID) const
279{
280    AutoMutex _l(mLock);
281    return mObjects.find(objectID);
282}
283
284void BpBinder::detachObject(const void* objectID)
285{
286    AutoMutex _l(mLock);
287    mObjects.detach(objectID);
288}
289
290BpBinder* BpBinder::remoteBinder()
291{
292    return this;
293}
294
295BpBinder::~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
322void 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
329void 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
339bool 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
349