summaryrefslogtreecommitdiffstats
path: root/libs/binder/Binder.cpp
blob: 9945f9188f52fabd8e13d95fa642ddd539333117 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
/*
 * Copyright (C) 2005 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <binder/Binder.h>

#include <utils/Atomic.h>
#include <binder/BpBinder.h>
#include <binder/IInterface.h>
#include <binder/Parcel.h>

#include <stdio.h>

namespace android {

// ---------------------------------------------------------------------------

IBinder::IBinder()
    : RefBase()
{
}

IBinder::~IBinder()
{
}

// ---------------------------------------------------------------------------

sp<IInterface>  IBinder::queryLocalInterface(const String16& descriptor)
{
    return NULL;
}

BBinder* IBinder::localBinder()
{
    return NULL;
}

BpBinder* IBinder::remoteBinder()
{
    return NULL;
}

bool IBinder::checkSubclass(const void* /*subclassID*/) const
{
    return false;
}

// ---------------------------------------------------------------------------

class BBinder::Extras
{
public:
    Mutex mLock;
    BpBinder::ObjectManager mObjects;
};

// ---------------------------------------------------------------------------

BBinder::BBinder()
    : mExtras(NULL)
{
}

bool BBinder::isBinderAlive() const
{
    return true;
}

status_t BBinder::pingBinder()
{
    return NO_ERROR;
}

const String16& BBinder::getInterfaceDescriptor() const
{
    // This is a local static rather than a global static,
    // to avoid static initializer ordering issues.
    static String16 sEmptyDescriptor;
    LOGW("reached BBinder::getInterfaceDescriptor (this=%p)", this);
    return sEmptyDescriptor;
}

status_t BBinder::transact(
    uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
{
    data.setDataPosition(0);

    status_t err = NO_ERROR;
    switch (code) {
        case PING_TRANSACTION:
            reply->writeInt32(pingBinder());
            break;
        default:
            err = onTransact(code, data, reply, flags);
            break;
    }

    if (reply != NULL) {
        reply->setDataPosition(0);
    }

    return err;
}

status_t BBinder::linkToDeath(
    const sp<DeathRecipient>& recipient, void* cookie, uint32_t flags)
{
    return INVALID_OPERATION;
}

status_t BBinder::unlinkToDeath(
    const wp<DeathRecipient>& recipient, void* cookie, uint32_t flags,
    wp<DeathRecipient>* outRecipient)
{
    return INVALID_OPERATION;
}

status_t BBinder::dump(int fd, const Vector<String16>& args)
{
    return NO_ERROR;
}

void BBinder::attachObject(
    const void* objectID, void* object, void* cleanupCookie,
    object_cleanup_func func)
{
    Extras* e = mExtras;

    if (!e) {
        e = new Extras;
        if (android_atomic_cmpxchg(0, reinterpret_cast<int32_t>(e),
                reinterpret_cast<volatile int32_t*>(&mExtras)) != 0) {
            delete e;
            e = mExtras;
        }
        if (e == 0) return; // out of memory
    }

    AutoMutex _l(e->mLock);
    e->mObjects.attach(objectID, object, cleanupCookie, func);
}

void* BBinder::findObject(const void* objectID) const
{
    Extras* e = mExtras;
    if (!e) return NULL;

    AutoMutex _l(e->mLock);
    return e->mObjects.find(objectID);
}

void BBinder::detachObject(const void* objectID)
{
    Extras* e = mExtras;
    if (!e) return;

    AutoMutex _l(e->mLock);
    e->mObjects.detach(objectID);
}

BBinder* BBinder::localBinder()
{
    return this;
}

BBinder::~BBinder()
{
    if (mExtras) delete mExtras;
}


status_t BBinder::onTransact(
    uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
{
    switch (code) {
        case INTERFACE_TRANSACTION:
            reply->writeString16(getInterfaceDescriptor());
            return NO_ERROR;

        case DUMP_TRANSACTION: {
            int fd = data.readFileDescriptor();
            int argc = data.readInt32();
            Vector<String16> args;
            for (int i = 0; i < argc && data.dataAvail() > 0; i++) {
               args.add(data.readString16());
            }
            return dump(fd, args);
        }
        default:
            return UNKNOWN_TRANSACTION;
    }
}

// ---------------------------------------------------------------------------

enum {
    // This is used to transfer ownership of the remote binder from
    // the BpRefBase object holding it (when it is constructed), to the
    // owner of the BpRefBase object when it first acquires that BpRefBase.
    kRemoteAcquired = 0x00000001
};

BpRefBase::BpRefBase(const sp<IBinder>& o)
    : mRemote(o.get()), mRefs(NULL), mState(0)
{
    extendObjectLifetime(OBJECT_LIFETIME_WEAK);

    if (mRemote) {
        mRemote->incStrong(this);           // Removed on first IncStrong().
        mRefs = mRemote->createWeak(this);  // Held for our entire lifetime.
    }
}

BpRefBase::~BpRefBase()
{
    if (mRemote) {
        if (!(mState&kRemoteAcquired)) {
            mRemote->decStrong(this);
        }
        mRefs->decWeak(this);
    }
}

void BpRefBase::onFirstRef()
{
    android_atomic_or(kRemoteAcquired, &mState);
}

void BpRefBase::onLastStrongRef(const void* id)
{
    if (mRemote) {
        mRemote->decStrong(this);
    }
}

bool BpRefBase::onIncStrongAttempted(uint32_t flags, const void* id)
{
    return mRemote ? mRefs->attemptIncStrong(this) : false;
}

// ---------------------------------------------------------------------------

}; // namespace android