IPCThreadState.cpp revision 67f78c4fe8f89b52199f509f36e42df0b1cdfe2d 
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 "IPCThreadState"
18
19#include <binder/IPCThreadState.h>
20
21#include <binder/Binder.h>
22#include <binder/BpBinder.h>
23#include <cutils/sched_policy.h>
24#include <utils/Debug.h>
25#include <utils/Log.h>
26#include <utils/TextOutput.h>
27#include <utils/threads.h>
28
29#include <private/binder/binder_module.h>
30#include <private/binder/Static.h>
31
32#include <sys/ioctl.h>
33#include <signal.h>
34#include <errno.h>
35#include <stdio.h>
36#include <unistd.h>
37
38#ifdef HAVE_PTHREADS
39#include <pthread.h>
40#include <sched.h>
41#include <sys/resource.h>
42#endif
43#ifdef HAVE_WIN32_THREADS
44#include <windows.h>
45#endif
46
47
48#if LOG_NDEBUG
49
50#define IF_LOG_TRANSACTIONS() if (false)
51#define IF_LOG_COMMANDS() if (false)
52#define LOG_REMOTEREFS(...)
53#define IF_LOG_REMOTEREFS() if (false)
54#define LOG_THREADPOOL(...)
55#define LOG_ONEWAY(...)
56
57#else
58
59#define IF_LOG_TRANSACTIONS() IF_LOG(LOG_VERBOSE, "transact")
60#define IF_LOG_COMMANDS() IF_LOG(LOG_VERBOSE, "ipc")
61#define LOG_REMOTEREFS(...) LOG(LOG_DEBUG, "remoterefs", __VA_ARGS__)
62#define IF_LOG_REMOTEREFS() IF_LOG(LOG_DEBUG, "remoterefs")
63#define LOG_THREADPOOL(...) LOG(LOG_DEBUG, "threadpool", __VA_ARGS__)
64#define LOG_ONEWAY(...) LOG(LOG_DEBUG, "ipc", __VA_ARGS__)
65
66#endif
67
68// ---------------------------------------------------------------------------
69
70namespace android {
71
72static const char* getReturnString(size_t idx);
73static const char* getCommandString(size_t idx);
74static const void* printReturnCommand(TextOutput& out, const void* _cmd);
75static const void* printCommand(TextOutput& out, const void* _cmd);
76
77// This will result in a missing symbol failure if the IF_LOG_COMMANDS()
78// conditionals don't get stripped...  but that is probably what we want.
79#if !LOG_NDEBUG
80static const char *kReturnStrings[] = {
81#if 1 /* TODO: error update strings */
82    "unknown",
83#else
84    "BR_OK",
85    "BR_TIMEOUT",
86    "BR_WAKEUP",
87    "BR_TRANSACTION",
88    "BR_REPLY",
89    "BR_ACQUIRE_RESULT",
90    "BR_DEAD_REPLY",
91    "BR_TRANSACTION_COMPLETE",
92    "BR_INCREFS",
93    "BR_ACQUIRE",
94    "BR_RELEASE",
95    "BR_DECREFS",
96    "BR_ATTEMPT_ACQUIRE",
97    "BR_EVENT_OCCURRED",
98    "BR_NOOP",
99    "BR_SPAWN_LOOPER",
100    "BR_FINISHED",
101    "BR_DEAD_BINDER",
102    "BR_CLEAR_DEATH_NOTIFICATION_DONE"
103#endif
104};
105
106static const char *kCommandStrings[] = {
107#if 1 /* TODO: error update strings */
108    "unknown",
109#else
110    "BC_NOOP",
111    "BC_TRANSACTION",
112    "BC_REPLY",
113    "BC_ACQUIRE_RESULT",
114    "BC_FREE_BUFFER",
115    "BC_TRANSACTION_COMPLETE",
116    "BC_INCREFS",
117    "BC_ACQUIRE",
118    "BC_RELEASE",
119    "BC_DECREFS",
120    "BC_INCREFS_DONE",
121    "BC_ACQUIRE_DONE",
122    "BC_ATTEMPT_ACQUIRE",
123    "BC_RETRIEVE_ROOT_OBJECT",
124    "BC_SET_THREAD_ENTRY",
125    "BC_REGISTER_LOOPER",
126    "BC_ENTER_LOOPER",
127    "BC_EXIT_LOOPER",
128    "BC_SYNC",
129    "BC_STOP_PROCESS",
130    "BC_STOP_SELF",
131    "BC_REQUEST_DEATH_NOTIFICATION",
132    "BC_CLEAR_DEATH_NOTIFICATION",
133    "BC_DEAD_BINDER_DONE"
134#endif
135};
136
137static const char* getReturnString(size_t idx)
138{
139    if (idx < sizeof(kReturnStrings) / sizeof(kReturnStrings[0]))
140        return kReturnStrings[idx];
141    else
142        return "unknown";
143}
144
145static const char* getCommandString(size_t idx)
146{
147    if (idx < sizeof(kCommandStrings) / sizeof(kCommandStrings[0]))
148        return kCommandStrings[idx];
149    else
150        return "unknown";
151}
152
153static const void* printBinderTransactionData(TextOutput& out, const void* data)
154{
155    const binder_transaction_data* btd =
156        (const binder_transaction_data*)data;
157    out << "target=" << btd->target.ptr << " (cookie " << btd->cookie << ")" << endl
158        << "code=" << TypeCode(btd->code) << ", flags=" << (void*)btd->flags << endl
159        << "data=" << btd->data.ptr.buffer << " (" << (void*)btd->data_size
160        << " bytes)" << endl
161        << "offsets=" << btd->data.ptr.offsets << " (" << (void*)btd->offsets_size
162        << " bytes)" << endl;
163    return btd+1;
164}
165
166static const void* printReturnCommand(TextOutput& out, const void* _cmd)
167{
168    static const int32_t N = sizeof(kReturnStrings)/sizeof(kReturnStrings[0]);
169
170    const int32_t* cmd = (const int32_t*)_cmd;
171    int32_t code = *cmd++;
172    if (code == BR_ERROR) {
173        out << "BR_ERROR: " << (void*)(*cmd++) << endl;
174        return cmd;
175    } else if (code < 0 || code >= N) {
176        out << "Unknown reply: " << code << endl;
177        return cmd;
178    }
179
180    out << kReturnStrings[code];
181    switch (code) {
182        case BR_TRANSACTION:
183        case BR_REPLY: {
184            out << ": " << indent;
185            cmd = (const int32_t *)printBinderTransactionData(out, cmd);
186            out << dedent;
187        } break;
188
189        case BR_ACQUIRE_RESULT: {
190            const int32_t res = *cmd++;
191            out << ": " << res << (res ? " (SUCCESS)" : " (FAILURE)");
192        } break;
193
194        case BR_INCREFS:
195        case BR_ACQUIRE:
196        case BR_RELEASE:
197        case BR_DECREFS: {
198            const int32_t b = *cmd++;
199            const int32_t c = *cmd++;
200            out << ": target=" << (void*)b << " (cookie " << (void*)c << ")";
201        } break;
202
203        case BR_ATTEMPT_ACQUIRE: {
204            const int32_t p = *cmd++;
205            const int32_t b = *cmd++;
206            const int32_t c = *cmd++;
207            out << ": target=" << (void*)b << " (cookie " << (void*)c
208                << "), pri=" << p;
209        } break;
210
211        case BR_DEAD_BINDER:
212        case BR_CLEAR_DEATH_NOTIFICATION_DONE: {
213            const int32_t c = *cmd++;
214            out << ": death cookie " << (void*)c;
215        } break;
216    }
217
218    out << endl;
219    return cmd;
220}
221
222static const void* printCommand(TextOutput& out, const void* _cmd)
223{
224    static const int32_t N = sizeof(kCommandStrings)/sizeof(kCommandStrings[0]);
225
226    const int32_t* cmd = (const int32_t*)_cmd;
227    int32_t code = *cmd++;
228    if (code < 0 || code >= N) {
229        out << "Unknown command: " << code << endl;
230        return cmd;
231    }
232
233    out << kCommandStrings[code];
234    switch (code) {
235        case BC_TRANSACTION:
236        case BC_REPLY: {
237            out << ": " << indent;
238            cmd = (const int32_t *)printBinderTransactionData(out, cmd);
239            out << dedent;
240        } break;
241
242        case BC_ACQUIRE_RESULT: {
243            const int32_t res = *cmd++;
244            out << ": " << res << (res ? " (SUCCESS)" : " (FAILURE)");
245        } break;
246
247        case BC_FREE_BUFFER: {
248            const int32_t buf = *cmd++;
249            out << ": buffer=" << (void*)buf;
250        } break;
251
252        case BC_INCREFS:
253        case BC_ACQUIRE:
254        case BC_RELEASE:
255        case BC_DECREFS: {
256            const int32_t d = *cmd++;
257            out << ": descriptor=" << (void*)d;
258        } break;
259
260        case BC_INCREFS_DONE:
261        case BC_ACQUIRE_DONE: {
262            const int32_t b = *cmd++;
263            const int32_t c = *cmd++;
264            out << ": target=" << (void*)b << " (cookie " << (void*)c << ")";
265        } break;
266
267        case BC_ATTEMPT_ACQUIRE: {
268            const int32_t p = *cmd++;
269            const int32_t d = *cmd++;
270            out << ": decriptor=" << (void*)d << ", pri=" << p;
271        } break;
272
273        case BC_REQUEST_DEATH_NOTIFICATION:
274        case BC_CLEAR_DEATH_NOTIFICATION: {
275            const int32_t h = *cmd++;
276            const int32_t c = *cmd++;
277            out << ": handle=" << h << " (death cookie " << (void*)c << ")";
278        } break;
279
280        case BC_DEAD_BINDER_DONE: {
281            const int32_t c = *cmd++;
282            out << ": death cookie " << (void*)c;
283        } break;
284    }
285
286    out << endl;
287    return cmd;
288}
289#endif
290
291static pthread_mutex_t gTLSMutex = PTHREAD_MUTEX_INITIALIZER;
292static bool gHaveTLS = false;
293static pthread_key_t gTLS = 0;
294static bool gShutdown = false;
295static bool gDisableBackgroundScheduling = false;
296
297IPCThreadState* IPCThreadState::self()
298{
299    if (gHaveTLS) {
300restart:
301        const pthread_key_t k = gTLS;
302        IPCThreadState* st = (IPCThreadState*)pthread_getspecific(k);
303        if (st) return st;
304        return new IPCThreadState;
305    }
306
307    if (gShutdown) return NULL;
308
309    pthread_mutex_lock(&gTLSMutex);
310    if (!gHaveTLS) {
311        if (pthread_key_create(&gTLS, threadDestructor) != 0) {
312            pthread_mutex_unlock(&gTLSMutex);
313            return NULL;
314        }
315        gHaveTLS = true;
316    }
317    pthread_mutex_unlock(&gTLSMutex);
318    goto restart;
319}
320
321void IPCThreadState::shutdown()
322{
323    gShutdown = true;
324
325    if (gHaveTLS) {
326        // XXX Need to wait for all thread pool threads to exit!
327        IPCThreadState* st = (IPCThreadState*)pthread_getspecific(gTLS);
328        if (st) {
329            delete st;
330            pthread_setspecific(gTLS, NULL);
331        }
332        gHaveTLS = false;
333    }
334}
335
336void IPCThreadState::disableBackgroundScheduling(bool disable)
337{
338    gDisableBackgroundScheduling = disable;
339}
340
341sp<ProcessState> IPCThreadState::process()
342{
343    return mProcess;
344}
345
346status_t IPCThreadState::clearLastError()
347{
348    const status_t err = mLastError;
349    mLastError = NO_ERROR;
350    return err;
351}
352
353int IPCThreadState::getCallingPid()
354{
355    return mCallingPid;
356}
357
358int IPCThreadState::getCallingUid()
359{
360    return mCallingUid;
361}
362
363int64_t IPCThreadState::clearCallingIdentity()
364{
365    int64_t token = ((int64_t)mCallingUid<<32) | mCallingPid;
366    clearCaller();
367    return token;
368}
369
370void IPCThreadState::setStrictModePolicy(int32_t policy)
371{
372    mStrictModePolicy = policy;
373}
374
375int32_t IPCThreadState::getStrictModePolicy() const
376{
377    return mStrictModePolicy;
378}
379
380void IPCThreadState::setLastTransactionBinderFlags(int32_t flags)
381{
382    mLastTransactionBinderFlags = flags;
383}
384
385int32_t IPCThreadState::getLastTransactionBinderFlags() const
386{
387    return mLastTransactionBinderFlags;
388}
389
390void IPCThreadState::restoreCallingIdentity(int64_t token)
391{
392    mCallingUid = (int)(token>>32);
393    mCallingPid = (int)token;
394}
395
396void IPCThreadState::clearCaller()
397{
398    mCallingPid = getpid();
399    mCallingUid = getuid();
400}
401
402void IPCThreadState::flushCommands()
403{
404    if (mProcess->mDriverFD <= 0)
405        return;
406    talkWithDriver(false);
407}
408
409void IPCThreadState::joinThreadPool(bool isMain)
410{
411    LOG_THREADPOOL("**** THREAD %p (PID %d) IS JOINING THE THREAD POOL\n", (void*)pthread_self(), getpid());
412
413    mOut.writeInt32(isMain ? BC_ENTER_LOOPER : BC_REGISTER_LOOPER);
414
415    // This thread may have been spawned by a thread that was in the background
416    // scheduling group, so first we will make sure it is in the default/foreground
417    // one to avoid performing an initial transaction in the background.
418    androidSetThreadSchedulingGroup(mMyThreadId, ANDROID_TGROUP_DEFAULT);
419
420    status_t result;
421    do {
422        int32_t cmd;
423
424        // When we've cleared the incoming command queue, process any pending derefs
425        if (mIn.dataPosition() >= mIn.dataSize()) {
426            size_t numPending = mPendingWeakDerefs.size();
427            if (numPending > 0) {
428                for (size_t i = 0; i < numPending; i++) {
429                    RefBase::weakref_type* refs = mPendingWeakDerefs[i];
430                    refs->decWeak(mProcess.get());
431                }
432                mPendingWeakDerefs.clear();
433            }
434
435            numPending = mPendingStrongDerefs.size();
436            if (numPending > 0) {
437                for (size_t i = 0; i < numPending; i++) {
438                    BBinder* obj = mPendingStrongDerefs[i];
439                    obj->decStrong(mProcess.get());
440                }
441                mPendingStrongDerefs.clear();
442            }
443        }
444
445        // now get the next command to be processed, waiting if necessary
446        result = talkWithDriver();
447        if (result >= NO_ERROR) {
448            size_t IN = mIn.dataAvail();
449            if (IN < sizeof(int32_t)) continue;
450            cmd = mIn.readInt32();
451            IF_LOG_COMMANDS() {
452                alog << "Processing top-level Command: "
453                    << getReturnString(cmd) << endl;
454            }
455
456
457            result = executeCommand(cmd);
458        }
459
460        // After executing the command, ensure that the thread is returned to the
461        // default cgroup before rejoining the pool.  The driver takes care of
462        // restoring the priority, but doesn't do anything with cgroups so we
463        // need to take care of that here in userspace.  Note that we do make
464        // sure to go in the foreground after executing a transaction, but
465        // there are other callbacks into user code that could have changed
466        // our group so we want to make absolutely sure it is put back.
467        androidSetThreadSchedulingGroup(mMyThreadId, ANDROID_TGROUP_DEFAULT);
468
469        // Let this thread exit the thread pool if it is no longer
470        // needed and it is not the main process thread.
471        if(result == TIMED_OUT && !isMain) {
472            break;
473        }
474    } while (result != -ECONNREFUSED && result != -EBADF);
475
476    LOG_THREADPOOL("**** THREAD %p (PID %d) IS LEAVING THE THREAD POOL err=%p\n",
477        (void*)pthread_self(), getpid(), (void*)result);
478
479    mOut.writeInt32(BC_EXIT_LOOPER);
480    talkWithDriver(false);
481}
482
483void IPCThreadState::stopProcess(bool immediate)
484{
485    //LOGI("**** STOPPING PROCESS");
486    flushCommands();
487    int fd = mProcess->mDriverFD;
488    mProcess->mDriverFD = -1;
489    close(fd);
490    //kill(getpid(), SIGKILL);
491}
492
493status_t IPCThreadState::transact(int32_t handle,
494                                  uint32_t code, const Parcel& data,
495                                  Parcel* reply, uint32_t flags)
496{
497    status_t err = data.errorCheck();
498
499    flags |= TF_ACCEPT_FDS;
500
501    IF_LOG_TRANSACTIONS() {
502        TextOutput::Bundle _b(alog);
503        alog << "BC_TRANSACTION thr " << (void*)pthread_self() << " / hand "
504            << handle << " / code " << TypeCode(code) << ": "
505            << indent << data << dedent << endl;
506    }
507
508    if (err == NO_ERROR) {
509        LOG_ONEWAY(">>>> SEND from pid %d uid %d %s", getpid(), getuid(),
510            (flags & TF_ONE_WAY) == 0 ? "READ REPLY" : "ONE WAY");
511        err = writeTransactionData(BC_TRANSACTION, flags, handle, code, data, NULL);
512    }
513
514    if (err != NO_ERROR) {
515        if (reply) reply->setError(err);
516        return (mLastError = err);
517    }
518
519    if ((flags & TF_ONE_WAY) == 0) {
520        #if 0
521        if (code == 4) { // relayout
522            LOGI(">>>>>> CALLING transaction 4");
523        } else {
524            LOGI(">>>>>> CALLING transaction %d", code);
525        }
526        #endif
527        if (reply) {
528            err = waitForResponse(reply);
529        } else {
530            Parcel fakeReply;
531            err = waitForResponse(&fakeReply);
532        }
533        #if 0
534        if (code == 4) { // relayout
535            LOGI("<<<<<< RETURNING transaction 4");
536        } else {
537            LOGI("<<<<<< RETURNING transaction %d", code);
538        }
539        #endif
540
541        IF_LOG_TRANSACTIONS() {
542            TextOutput::Bundle _b(alog);
543            alog << "BR_REPLY thr " << (void*)pthread_self() << " / hand "
544                << handle << ": ";
545            if (reply) alog << indent << *reply << dedent << endl;
546            else alog << "(none requested)" << endl;
547        }
548    } else {
549        err = waitForResponse(NULL, NULL);
550    }
551
552    return err;
553}
554
555void IPCThreadState::incStrongHandle(int32_t handle)
556{
557    LOG_REMOTEREFS("IPCThreadState::incStrongHandle(%d)\n", handle);
558    mOut.writeInt32(BC_ACQUIRE);
559    mOut.writeInt32(handle);
560}
561
562void IPCThreadState::decStrongHandle(int32_t handle)
563{
564    LOG_REMOTEREFS("IPCThreadState::decStrongHandle(%d)\n", handle);
565    mOut.writeInt32(BC_RELEASE);
566    mOut.writeInt32(handle);
567}
568
569void IPCThreadState::incWeakHandle(int32_t handle)
570{
571    LOG_REMOTEREFS("IPCThreadState::incWeakHandle(%d)\n", handle);
572    mOut.writeInt32(BC_INCREFS);
573    mOut.writeInt32(handle);
574}
575
576void IPCThreadState::decWeakHandle(int32_t handle)
577{
578    LOG_REMOTEREFS("IPCThreadState::decWeakHandle(%d)\n", handle);
579    mOut.writeInt32(BC_DECREFS);
580    mOut.writeInt32(handle);
581}
582
583status_t IPCThreadState::attemptIncStrongHandle(int32_t handle)
584{
585    mOut.writeInt32(BC_ATTEMPT_ACQUIRE);
586    mOut.writeInt32(0); // xxx was thread priority
587    mOut.writeInt32(handle);
588    status_t result = UNKNOWN_ERROR;
589
590    waitForResponse(NULL, &result);
591
592#if LOG_REFCOUNTS
593    printf("IPCThreadState::attemptIncStrongHandle(%ld) = %s\n",
594        handle, result == NO_ERROR ? "SUCCESS" : "FAILURE");
595#endif
596
597    return result;
598}
599
600void IPCThreadState::expungeHandle(int32_t handle, IBinder* binder)
601{
602#if LOG_REFCOUNTS
603    printf("IPCThreadState::expungeHandle(%ld)\n", handle);
604#endif
605    self()->mProcess->expungeHandle(handle, binder);
606}
607
608status_t IPCThreadState::requestDeathNotification(int32_t handle, BpBinder* proxy)
609{
610    mOut.writeInt32(BC_REQUEST_DEATH_NOTIFICATION);
611    mOut.writeInt32((int32_t)handle);
612    mOut.writeInt32((int32_t)proxy);
613    return NO_ERROR;
614}
615
616status_t IPCThreadState::clearDeathNotification(int32_t handle, BpBinder* proxy)
617{
618    mOut.writeInt32(BC_CLEAR_DEATH_NOTIFICATION);
619    mOut.writeInt32((int32_t)handle);
620    mOut.writeInt32((int32_t)proxy);
621    return NO_ERROR;
622}
623
624IPCThreadState::IPCThreadState()
625    : mProcess(ProcessState::self()),
626      mMyThreadId(androidGetTid()),
627      mStrictModePolicy(0),
628      mLastTransactionBinderFlags(0)
629{
630    pthread_setspecific(gTLS, this);
631    clearCaller();
632    mIn.setDataCapacity(256);
633    mOut.setDataCapacity(256);
634}
635
636IPCThreadState::~IPCThreadState()
637{
638}
639
640status_t IPCThreadState::sendReply(const Parcel& reply, uint32_t flags)
641{
642    status_t err;
643    status_t statusBuffer;
644    err = writeTransactionData(BC_REPLY, flags, -1, 0, reply, &statusBuffer);
645    if (err < NO_ERROR) return err;
646
647    return waitForResponse(NULL, NULL);
648}
649
650status_t IPCThreadState::waitForResponse(Parcel *reply, status_t *acquireResult)
651{
652    int32_t cmd;
653    int32_t err;
654
655    while (1) {
656        if ((err=talkWithDriver()) < NO_ERROR) break;
657        err = mIn.errorCheck();
658        if (err < NO_ERROR) break;
659        if (mIn.dataAvail() == 0) continue;
660
661        cmd = mIn.readInt32();
662
663        IF_LOG_COMMANDS() {
664            alog << "Processing waitForResponse Command: "
665                << getReturnString(cmd) << endl;
666        }
667
668        switch (cmd) {
669        case BR_TRANSACTION_COMPLETE:
670            if (!reply && !acquireResult) goto finish;
671            break;
672
673        case BR_DEAD_REPLY:
674            err = DEAD_OBJECT;
675            goto finish;
676
677        case BR_FAILED_REPLY:
678            err = FAILED_TRANSACTION;
679            goto finish;
680
681        case BR_ACQUIRE_RESULT:
682            {
683                LOG_ASSERT(acquireResult != NULL, "Unexpected brACQUIRE_RESULT");
684                const int32_t result = mIn.readInt32();
685                if (!acquireResult) continue;
686                *acquireResult = result ? NO_ERROR : INVALID_OPERATION;
687            }
688            goto finish;
689
690        case BR_REPLY:
691            {
692                binder_transaction_data tr;
693                err = mIn.read(&tr, sizeof(tr));
694                LOG_ASSERT(err == NO_ERROR, "Not enough command data for brREPLY");
695                if (err != NO_ERROR) goto finish;
696
697                if (reply) {
698                    if ((tr.flags & TF_STATUS_CODE) == 0) {
699                        reply->ipcSetDataReference(
700                            reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer),
701                            tr.data_size,
702                            reinterpret_cast<const size_t*>(tr.data.ptr.offsets),
703                            tr.offsets_size/sizeof(size_t),
704                            freeBuffer, this);
705                    } else {
706                        err = *static_cast<const status_t*>(tr.data.ptr.buffer);
707                        freeBuffer(NULL,
708                            reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer),
709                            tr.data_size,
710                            reinterpret_cast<const size_t*>(tr.data.ptr.offsets),
711                            tr.offsets_size/sizeof(size_t), this);
712                    }
713                } else {
714                    freeBuffer(NULL,
715                        reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer),
716                        tr.data_size,
717                        reinterpret_cast<const size_t*>(tr.data.ptr.offsets),
718                        tr.offsets_size/sizeof(size_t), this);
719                    continue;
720                }
721            }
722            goto finish;
723
724        default:
725            err = executeCommand(cmd);
726            if (err != NO_ERROR) goto finish;
727            break;
728        }
729    }
730
731finish:
732    if (err != NO_ERROR) {
733        if (acquireResult) *acquireResult = err;
734        if (reply) reply->setError(err);
735        mLastError = err;
736    }
737
738    return err;
739}
740
741status_t IPCThreadState::talkWithDriver(bool doReceive)
742{
743    LOG_ASSERT(mProcess->mDriverFD >= 0, "Binder driver is not opened");
744
745    binder_write_read bwr;
746
747    // Is the read buffer empty?
748    const bool needRead = mIn.dataPosition() >= mIn.dataSize();
749
750    // We don't want to write anything if we are still reading
751    // from data left in the input buffer and the caller
752    // has requested to read the next data.
753    const size_t outAvail = (!doReceive || needRead) ? mOut.dataSize() : 0;
754
755    bwr.write_size = outAvail;
756    bwr.write_buffer = (long unsigned int)mOut.data();
757
758    // This is what we'll read.
759    if (doReceive && needRead) {
760        bwr.read_size = mIn.dataCapacity();
761        bwr.read_buffer = (long unsigned int)mIn.data();
762    } else {
763        bwr.read_size = 0;
764    }
765
766    IF_LOG_COMMANDS() {
767        TextOutput::Bundle _b(alog);
768        if (outAvail != 0) {
769            alog << "Sending commands to driver: " << indent;
770            const void* cmds = (const void*)bwr.write_buffer;
771            const void* end = ((const uint8_t*)cmds)+bwr.write_size;
772            alog << HexDump(cmds, bwr.write_size) << endl;
773            while (cmds < end) cmds = printCommand(alog, cmds);
774            alog << dedent;
775        }
776        alog << "Size of receive buffer: " << bwr.read_size
777            << ", needRead: " << needRead << ", doReceive: " << doReceive << endl;
778    }
779
780    // Return immediately if there is nothing to do.
781    if ((bwr.write_size == 0) && (bwr.read_size == 0)) return NO_ERROR;
782
783    bwr.write_consumed = 0;
784    bwr.read_consumed = 0;
785    status_t err;
786    do {
787        IF_LOG_COMMANDS() {
788            alog << "About to read/write, write size = " << mOut.dataSize() << endl;
789        }
790#if defined(HAVE_ANDROID_OS)
791        if (ioctl(mProcess->mDriverFD, BINDER_WRITE_READ, &bwr) >= 0)
792            err = NO_ERROR;
793        else
794            err = -errno;
795#else
796        err = INVALID_OPERATION;
797#endif
798        IF_LOG_COMMANDS() {
799            alog << "Finished read/write, write size = " << mOut.dataSize() << endl;
800        }
801    } while (err == -EINTR);
802
803    IF_LOG_COMMANDS() {
804        alog << "Our err: " << (void*)err << ", write consumed: "
805            << bwr.write_consumed << " (of " << mOut.dataSize()
806			<< "), read consumed: " << bwr.read_consumed << endl;
807    }
808
809    if (err >= NO_ERROR) {
810        if (bwr.write_consumed > 0) {
811            if (bwr.write_consumed < (ssize_t)mOut.dataSize())
812                mOut.remove(0, bwr.write_consumed);
813            else
814                mOut.setDataSize(0);
815        }
816        if (bwr.read_consumed > 0) {
817            mIn.setDataSize(bwr.read_consumed);
818            mIn.setDataPosition(0);
819        }
820        IF_LOG_COMMANDS() {
821            TextOutput::Bundle _b(alog);
822            alog << "Remaining data size: " << mOut.dataSize() << endl;
823            alog << "Received commands from driver: " << indent;
824            const void* cmds = mIn.data();
825            const void* end = mIn.data() + mIn.dataSize();
826            alog << HexDump(cmds, mIn.dataSize()) << endl;
827            while (cmds < end) cmds = printReturnCommand(alog, cmds);
828            alog << dedent;
829        }
830        return NO_ERROR;
831    }
832
833    return err;
834}
835
836status_t IPCThreadState::writeTransactionData(int32_t cmd, uint32_t binderFlags,
837    int32_t handle, uint32_t code, const Parcel& data, status_t* statusBuffer)
838{
839    binder_transaction_data tr;
840
841    tr.target.handle = handle;
842    tr.code = code;
843    tr.flags = binderFlags;
844
845    const status_t err = data.errorCheck();
846    if (err == NO_ERROR) {
847        tr.data_size = data.ipcDataSize();
848        tr.data.ptr.buffer = data.ipcData();
849        tr.offsets_size = data.ipcObjectsCount()*sizeof(size_t);
850        tr.data.ptr.offsets = data.ipcObjects();
851    } else if (statusBuffer) {
852        tr.flags |= TF_STATUS_CODE;
853        *statusBuffer = err;
854        tr.data_size = sizeof(status_t);
855        tr.data.ptr.buffer = statusBuffer;
856        tr.offsets_size = 0;
857        tr.data.ptr.offsets = NULL;
858    } else {
859        return (mLastError = err);
860    }
861
862    mOut.writeInt32(cmd);
863    mOut.write(&tr, sizeof(tr));
864
865    return NO_ERROR;
866}
867
868sp<BBinder> the_context_object;
869
870void setTheContextObject(sp<BBinder> obj)
871{
872    the_context_object = obj;
873}
874
875status_t IPCThreadState::executeCommand(int32_t cmd)
876{
877    BBinder* obj;
878    RefBase::weakref_type* refs;
879    status_t result = NO_ERROR;
880
881    switch (cmd) {
882    case BR_ERROR:
883        result = mIn.readInt32();
884        break;
885
886    case BR_OK:
887        break;
888
889    case BR_ACQUIRE:
890        refs = (RefBase::weakref_type*)mIn.readInt32();
891        obj = (BBinder*)mIn.readInt32();
892        LOG_ASSERT(refs->refBase() == obj,
893                   "BR_ACQUIRE: object %p does not match cookie %p (expected %p)",
894                   refs, obj, refs->refBase());
895        obj->incStrong(mProcess.get());
896        IF_LOG_REMOTEREFS() {
897            LOG_REMOTEREFS("BR_ACQUIRE from driver on %p", obj);
898            obj->printRefs();
899        }
900        mOut.writeInt32(BC_ACQUIRE_DONE);
901        mOut.writeInt32((int32_t)refs);
902        mOut.writeInt32((int32_t)obj);
903        break;
904
905    case BR_RELEASE:
906        refs = (RefBase::weakref_type*)mIn.readInt32();
907        obj = (BBinder*)mIn.readInt32();
908        LOG_ASSERT(refs->refBase() == obj,
909                   "BR_RELEASE: object %p does not match cookie %p (expected %p)",
910                   refs, obj, refs->refBase());
911        IF_LOG_REMOTEREFS() {
912            LOG_REMOTEREFS("BR_RELEASE from driver on %p", obj);
913            obj->printRefs();
914        }
915        mPendingStrongDerefs.push(obj);
916        break;
917
918    case BR_INCREFS:
919        refs = (RefBase::weakref_type*)mIn.readInt32();
920        obj = (BBinder*)mIn.readInt32();
921        refs->incWeak(mProcess.get());
922        mOut.writeInt32(BC_INCREFS_DONE);
923        mOut.writeInt32((int32_t)refs);
924        mOut.writeInt32((int32_t)obj);
925        break;
926
927    case BR_DECREFS:
928        refs = (RefBase::weakref_type*)mIn.readInt32();
929        obj = (BBinder*)mIn.readInt32();
930        // NOTE: This assertion is not valid, because the object may no
931        // longer exist (thus the (BBinder*)cast above resulting in a different
932        // memory address).
933        //LOG_ASSERT(refs->refBase() == obj,
934        //           "BR_DECREFS: object %p does not match cookie %p (expected %p)",
935        //           refs, obj, refs->refBase());
936        mPendingWeakDerefs.push(refs);
937        break;
938
939    case BR_ATTEMPT_ACQUIRE:
940        refs = (RefBase::weakref_type*)mIn.readInt32();
941        obj = (BBinder*)mIn.readInt32();
942
943        {
944            const bool success = refs->attemptIncStrong(mProcess.get());
945            LOG_ASSERT(success && refs->refBase() == obj,
946                       "BR_ATTEMPT_ACQUIRE: object %p does not match cookie %p (expected %p)",
947                       refs, obj, refs->refBase());
948
949            mOut.writeInt32(BC_ACQUIRE_RESULT);
950            mOut.writeInt32((int32_t)success);
951        }
952        break;
953
954    case BR_TRANSACTION:
955        {
956            binder_transaction_data tr;
957            result = mIn.read(&tr, sizeof(tr));
958            LOG_ASSERT(result == NO_ERROR,
959                "Not enough command data for brTRANSACTION");
960            if (result != NO_ERROR) break;
961
962            Parcel buffer;
963            buffer.ipcSetDataReference(
964                reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer),
965                tr.data_size,
966                reinterpret_cast<const size_t*>(tr.data.ptr.offsets),
967                tr.offsets_size/sizeof(size_t), freeBuffer, this);
968
969            const pid_t origPid = mCallingPid;
970            const uid_t origUid = mCallingUid;
971
972            mCallingPid = tr.sender_pid;
973            mCallingUid = tr.sender_euid;
974
975            int curPrio = getpriority(PRIO_PROCESS, mMyThreadId);
976            if (gDisableBackgroundScheduling) {
977                if (curPrio > ANDROID_PRIORITY_NORMAL) {
978                    // We have inherited a reduced priority from the caller, but do not
979                    // want to run in that state in this process.  The driver set our
980                    // priority already (though not our scheduling class), so bounce
981                    // it back to the default before invoking the transaction.
982                    setpriority(PRIO_PROCESS, mMyThreadId, ANDROID_PRIORITY_NORMAL);
983                }
984            } else {
985                if (curPrio >= ANDROID_PRIORITY_BACKGROUND) {
986                    // We want to use the inherited priority from the caller.
987                    // Ensure this thread is in the background scheduling class,
988                    // since the driver won't modify scheduling classes for us.
989                    // The scheduling group is reset to default by the caller
990                    // once this method returns after the transaction is complete.
991                    androidSetThreadSchedulingGroup(mMyThreadId,
992                                                    ANDROID_TGROUP_BG_NONINTERACT);
993                }
994            }
995
996            //LOGI(">>>> TRANSACT from pid %d uid %d\n", mCallingPid, mCallingUid);
997
998            Parcel reply;
999            IF_LOG_TRANSACTIONS() {
1000                TextOutput::Bundle _b(alog);
1001                alog << "BR_TRANSACTION thr " << (void*)pthread_self()
1002                    << " / obj " << tr.target.ptr << " / code "
1003                    << TypeCode(tr.code) << ": " << indent << buffer
1004                    << dedent << endl
1005                    << "Data addr = "
1006                    << reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer)
1007                    << ", offsets addr="
1008                    << reinterpret_cast<const size_t*>(tr.data.ptr.offsets) << endl;
1009            }
1010            if (tr.target.ptr) {
1011                sp<BBinder> b((BBinder*)tr.cookie);
1012                const status_t error = b->transact(tr.code, buffer, &reply, tr.flags);
1013                if (error < NO_ERROR) reply.setError(error);
1014
1015            } else {
1016                const status_t error = the_context_object->transact(tr.code, buffer, &reply, tr.flags);
1017                if (error < NO_ERROR) reply.setError(error);
1018            }
1019
1020            //LOGI("<<<< TRANSACT from pid %d restore pid %d uid %d\n",
1021            //     mCallingPid, origPid, origUid);
1022
1023            if ((tr.flags & TF_ONE_WAY) == 0) {
1024                LOG_ONEWAY("Sending reply to %d!", mCallingPid);
1025                sendReply(reply, 0);
1026            } else {
1027                LOG_ONEWAY("NOT sending reply to %d!", mCallingPid);
1028            }
1029
1030            mCallingPid = origPid;
1031            mCallingUid = origUid;
1032
1033            IF_LOG_TRANSACTIONS() {
1034                TextOutput::Bundle _b(alog);
1035                alog << "BC_REPLY thr " << (void*)pthread_self() << " / obj "
1036                    << tr.target.ptr << ": " << indent << reply << dedent << endl;
1037            }
1038
1039        }
1040        break;
1041
1042    case BR_DEAD_BINDER:
1043        {
1044            BpBinder *proxy = (BpBinder*)mIn.readInt32();
1045            proxy->sendObituary();
1046            mOut.writeInt32(BC_DEAD_BINDER_DONE);
1047            mOut.writeInt32((int32_t)proxy);
1048        } break;
1049
1050    case BR_CLEAR_DEATH_NOTIFICATION_DONE:
1051        {
1052            BpBinder *proxy = (BpBinder*)mIn.readInt32();
1053            proxy->getWeakRefs()->decWeak(proxy);
1054        } break;
1055
1056    case BR_FINISHED:
1057        result = TIMED_OUT;
1058        break;
1059
1060    case BR_NOOP:
1061        break;
1062
1063    case BR_SPAWN_LOOPER:
1064        mProcess->spawnPooledThread(false);
1065        break;
1066
1067    default:
1068        printf("*** BAD COMMAND %d received from Binder driver\n", cmd);
1069        result = UNKNOWN_ERROR;
1070        break;
1071    }
1072
1073    if (result != NO_ERROR) {
1074        mLastError = result;
1075    }
1076
1077    return result;
1078}
1079
1080void IPCThreadState::threadDestructor(void *st)
1081{
1082	IPCThreadState* const self = static_cast<IPCThreadState*>(st);
1083	if (self) {
1084		self->flushCommands();
1085#if defined(HAVE_ANDROID_OS)
1086        ioctl(self->mProcess->mDriverFD, BINDER_THREAD_EXIT, 0);
1087#endif
1088		delete self;
1089	}
1090}
1091
1092
1093void IPCThreadState::freeBuffer(Parcel* parcel, const uint8_t* data, size_t dataSize,
1094                                const size_t* objects, size_t objectsSize,
1095                                void* cookie)
1096{
1097    //LOGI("Freeing parcel %p", &parcel);
1098    IF_LOG_COMMANDS() {
1099        alog << "Writing BC_FREE_BUFFER for " << data << endl;
1100    }
1101    LOG_ASSERT(data != NULL, "Called with NULL data");
1102    if (parcel != NULL) parcel->closeFileDescriptors();
1103    IPCThreadState* state = self();
1104    state->mOut.writeInt32(BC_FREE_BUFFER);
1105    state->mOut.writeInt32((int32_t)data);
1106}
1107
1108}; // namespace android
1109