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IPCThreadState.cpp
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/*
* 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.
*/
#define LOG_TAG "hw-IPCThreadState"
#include <hwbinder/IPCThreadState.h>
#include <hwbinder/Binder.h>
#include <hwbinder/BpHwBinder.h>
#include <android-base/macros.h>
#include <utils/CallStack.h>
#include <utils/Log.h>
#include <utils/SystemClock.h>
#include <utils/threads.h>
#include "binder_kernel.h"
#include <hwbinder/Static.h>
#include "TextOutput.h"
#include <atomic>
#include <errno.h>
#include <inttypes.h>
#include <linux/sched.h>
#include <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/resource.h>
#include <unistd.h>
#if LOG_NDEBUG
#define IF_LOG_TRANSACTIONS() if (false)
#define IF_LOG_COMMANDS() if (false)
#define LOG_REMOTEREFS(...)
#define IF_LOG_REMOTEREFS() if (false)
#define LOG_THREADPOOL(...)
#define LOG_ONEWAY(...)
#else
#define IF_LOG_TRANSACTIONS() IF_ALOG(LOG_VERBOSE, "transact")
#define IF_LOG_COMMANDS() IF_ALOG(LOG_VERBOSE, "ipc")
#define LOG_REMOTEREFS(...) ALOG(LOG_DEBUG, "remoterefs", __VA_ARGS__)
#define IF_LOG_REMOTEREFS() IF_ALOG(LOG_DEBUG, "remoterefs")
#define LOG_THREADPOOL(...) ALOG(LOG_DEBUG, "threadpool", __VA_ARGS__)
#define LOG_ONEWAY(...) ALOG(LOG_DEBUG, "ipc", __VA_ARGS__)
#endif
// ---------------------------------------------------------------------------
namespace android {
namespace hardware {
// Static const and functions will be optimized out if not used,
// when LOG_NDEBUG and references in IF_LOG_COMMANDS() are optimized out.
static const char *kReturnStrings[] = {
"BR_ERROR",
"BR_OK",
"BR_TRANSACTION",
"BR_REPLY",
"BR_ACQUIRE_RESULT",
"BR_DEAD_REPLY",
"BR_TRANSACTION_COMPLETE",
"BR_INCREFS",
"BR_ACQUIRE",
"BR_RELEASE",
"BR_DECREFS",
"BR_ATTEMPT_ACQUIRE",
"BR_NOOP",
"BR_SPAWN_LOOPER",
"BR_FINISHED",
"BR_DEAD_BINDER",
"BR_CLEAR_DEATH_NOTIFICATION_DONE",
"BR_FAILED_REPLY",
"BR_FROZEN_REPLY",
"BR_ONEWAY_SPAM_SUSPECT",
"BR_TRANSACTION_SEC_CTX",
};
static const char *kCommandStrings[] = {
"BC_TRANSACTION",
"BC_REPLY",
"BC_ACQUIRE_RESULT",
"BC_FREE_BUFFER",
"BC_INCREFS",
"BC_ACQUIRE",
"BC_RELEASE",
"BC_DECREFS",
"BC_INCREFS_DONE",
"BC_ACQUIRE_DONE",
"BC_ATTEMPT_ACQUIRE",
"BC_REGISTER_LOOPER",
"BC_ENTER_LOOPER",
"BC_EXIT_LOOPER",
"BC_REQUEST_DEATH_NOTIFICATION",
"BC_CLEAR_DEATH_NOTIFICATION",
"BC_DEAD_BINDER_DONE"
};
static const char* getReturnString(uint32_t cmd)
{
size_t idx = cmd & _IOC_NRMASK;
if (idx < sizeof(kReturnStrings) / sizeof(kReturnStrings[0]))
return kReturnStrings[idx];
else
return "unknown";
}
static const void* printBinderTransactionData(TextOutput& out, const void* data)
{
const binder_transaction_data* btd =
(const binder_transaction_data*)data;
if (btd->target.handle < 1024) {
/* want to print descriptors in decimal; guess based on value */
out << "target.desc=" << btd->target.handle;
} else {
out << "target.ptr=" << btd->target.ptr;
}
out << " (cookie " << btd->cookie << ")" << endl
<< "code=" << TypeCode(btd->code) << ", flags=" << (void*)(long)btd->flags << endl
<< "data=" << btd->data.ptr.buffer << " (" << (void*)btd->data_size
<< " bytes)" << endl
<< "offsets=" << btd->data.ptr.offsets << " (" << (void*)btd->offsets_size
<< " bytes)";
return btd+1;
}
static const void* printReturnCommand(TextOutput& out, const void* _cmd)
{
static const size_t N = sizeof(kReturnStrings)/sizeof(kReturnStrings[0]);
const int32_t* cmd = (const int32_t*)_cmd;
uint32_t code = (uint32_t)*cmd++;
size_t cmdIndex = code & 0xff;
if (code == BR_ERROR) {
out << "BR_ERROR: " << (void*)(long)(*cmd++) << endl;
return cmd;
} else if (cmdIndex >= N) {
out << "Unknown reply: " << code << endl;
return cmd;
}
out << kReturnStrings[cmdIndex];
switch (code) {
case BR_TRANSACTION:
case BR_REPLY: {
out << ": " << indent;
cmd = (const int32_t *)printBinderTransactionData(out, cmd);
out << dedent;
} break;
case BR_ACQUIRE_RESULT: {
const int32_t res = *cmd++;
out << ": " << res << (res ? " (SUCCESS)" : " (FAILURE)");
} break;
case BR_INCREFS:
case BR_ACQUIRE:
case BR_RELEASE:
case BR_DECREFS: {
const int32_t b = *cmd++;
const int32_t c = *cmd++;
out << ": target=" << (void*)(long)b << " (cookie " << (void*)(long)c << ")";
} break;
case BR_ATTEMPT_ACQUIRE: {
const int32_t p = *cmd++;
const int32_t b = *cmd++;
const int32_t c = *cmd++;
out << ": target=" << (void*)(long)b << " (cookie " << (void*)(long)c
<< "), pri=" << p;
} break;
case BR_DEAD_BINDER:
case BR_CLEAR_DEATH_NOTIFICATION_DONE: {
const int32_t c = *cmd++;
out << ": death cookie " << (void*)(long)c;
} break;
default:
// no details to show for: BR_OK, BR_DEAD_REPLY,
// BR_TRANSACTION_COMPLETE, BR_FINISHED
break;
}
out << endl;
return cmd;
}
static const void* printCommand(TextOutput& out, const void* _cmd)
{
static const size_t N = sizeof(kCommandStrings)/sizeof(kCommandStrings[0]);
const int32_t* cmd = (const int32_t*)_cmd;
uint32_t code = (uint32_t)*cmd++;
size_t cmdIndex = code & 0xff;
if (cmdIndex >= N) {
out << "Unknown command: " << code << endl;
return cmd;
}
out << kCommandStrings[cmdIndex];
switch (code) {
case BC_TRANSACTION:
case BC_REPLY: {
out << ": " << indent;
cmd = (const int32_t *)printBinderTransactionData(out, cmd);
out << dedent;
} break;
case BC_ACQUIRE_RESULT: {
const int32_t res = *cmd++;
out << ": " << res << (res ? " (SUCCESS)" : " (FAILURE)");
} break;
case BC_FREE_BUFFER: {
const int32_t buf = *cmd++;
out << ": buffer=" << (void*)(long)buf;
} break;
case BC_INCREFS:
case BC_ACQUIRE:
case BC_RELEASE:
case BC_DECREFS: {
const int32_t d = *cmd++;
out << ": desc=" << d;
} break;
case BC_INCREFS_DONE:
case BC_ACQUIRE_DONE: {
const int32_t b = *cmd++;
const int32_t c = *cmd++;
out << ": target=" << (void*)(long)b << " (cookie " << (void*)(long)c << ")";
} break;
case BC_ATTEMPT_ACQUIRE: {
const int32_t p = *cmd++;
const int32_t d = *cmd++;
out << ": desc=" << d << ", pri=" << p;
} break;
case BC_REQUEST_DEATH_NOTIFICATION:
case BC_CLEAR_DEATH_NOTIFICATION: {
const int32_t h = *cmd++;
const int32_t c = *cmd++;
out << ": handle=" << h << " (death cookie " << (void*)(long)c << ")";
} break;
case BC_DEAD_BINDER_DONE: {
const int32_t c = *cmd++;
out << ": death cookie " << (void*)(long)c;
} break;
default:
// no details to show for: BC_REGISTER_LOOPER, BC_ENTER_LOOPER,
// BC_EXIT_LOOPER
break;
}
out << endl;
return cmd;
}
static pthread_mutex_t gTLSMutex = PTHREAD_MUTEX_INITIALIZER;
static std::atomic<bool> gHaveTLS = false;
static pthread_key_t gTLS = 0;
static std::atomic<bool> gShutdown = false;
IPCThreadState* IPCThreadState::self()
{
if (gHaveTLS.load(std::memory_order_acquire)) {
restart:
const pthread_key_t k = gTLS;
IPCThreadState* st = (IPCThreadState*)pthread_getspecific(k);
if (st) return st;
return new IPCThreadState;
}
// Racey, heuristic test for simultaneous shutdown.
if (gShutdown.load(std::memory_order_relaxed)) {
ALOGW("Calling IPCThreadState::self() during shutdown is dangerous, expect a crash.\n");
return nullptr;
}
pthread_mutex_lock(&gTLSMutex);
if (!gHaveTLS.load(std::memory_order_relaxed)) {
int key_create_value = pthread_key_create(&gTLS, threadDestructor);
if (key_create_value != 0) {
pthread_mutex_unlock(&gTLSMutex);
ALOGW("IPCThreadState::self() unable to create TLS key, expect a crash: %s\n",
strerror(key_create_value));
return nullptr;
}
gHaveTLS.store(true, std::memory_order_release);
}
pthread_mutex_unlock(&gTLSMutex);
goto restart;
}
IPCThreadState* IPCThreadState::selfOrNull()
{
if (gHaveTLS.load(std::memory_order_acquire)) {
const pthread_key_t k = gTLS;
IPCThreadState* st = (IPCThreadState*)pthread_getspecific(k);
return st;
}
return nullptr;
}
void IPCThreadState::shutdown()
{
gShutdown.store(true, std::memory_order_relaxed);
if (gHaveTLS.load(std::memory_order_acquire)) {
// XXX Need to wait for all thread pool threads to exit!
IPCThreadState* st = (IPCThreadState*)pthread_getspecific(gTLS);
if (st) {
delete st;
pthread_setspecific(gTLS, nullptr);
}
pthread_key_delete(gTLS);
gHaveTLS.store(false, std::memory_order_release);
}
}
sp<ProcessState> IPCThreadState::process()
{
return mProcess;
}
status_t IPCThreadState::clearLastError()
{
const status_t err = mLastError;
mLastError = NO_ERROR;
return err;
}
pid_t IPCThreadState::getCallingPid() const
{
return mCallingPid;
}
const char* IPCThreadState::getCallingSid() const
{
return mCallingSid;
}
uid_t IPCThreadState::getCallingUid() const
{
return mCallingUid;
}
int64_t IPCThreadState::clearCallingIdentity()
{
// ignore mCallingSid for legacy reasons
int64_t token = ((int64_t)mCallingUid<<32) | mCallingPid;
clearCaller();
return token;
}
void IPCThreadState::setStrictModePolicy(int32_t policy)
{
mStrictModePolicy = policy;
}
int32_t IPCThreadState::getStrictModePolicy() const
{
return mStrictModePolicy;
}
void IPCThreadState::setLastTransactionBinderFlags(int32_t flags)
{
mLastTransactionBinderFlags = flags;
}
int32_t IPCThreadState::getLastTransactionBinderFlags() const
{
return mLastTransactionBinderFlags;
}
void IPCThreadState::restoreCallingIdentity(int64_t token)
{
mCallingUid = (int)(token>>32);
mCallingSid = nullptr; // not enough data to restore
mCallingPid = (int)token;
}
void IPCThreadState::clearCaller()
{
mCallingPid = getpid();
mCallingSid = nullptr; // expensive to lookup
mCallingUid = getuid();
}
void IPCThreadState::flushCommands()
{
if (mProcess->mDriverFD < 0)
return;
talkWithDriver(false);
// The flush could have caused post-write refcount decrements to have
// been executed, which in turn could result in BC_RELEASE/BC_DECREFS
// being queued in mOut. So flush again, if we need to.
if (mOut.dataSize() > 0) {
talkWithDriver(false);
}
if (mOut.dataSize() > 0) {
ALOGW("mOut.dataSize() > 0 after flushCommands()");
}
}
status_t IPCThreadState::getAndExecuteCommand()
{
status_t result;
int32_t cmd;
result = talkWithDriver();
if (result >= NO_ERROR) {
size_t IN = mIn.dataAvail();
if (IN < sizeof(int32_t)) return result;
cmd = mIn.readInt32();
IF_LOG_COMMANDS() {
alog << "Processing top-level Command: "
<< getReturnString(cmd) << endl;
}
pthread_mutex_lock(&mProcess->mThreadCountLock);
mProcess->mExecutingThreadsCount++;
if (mProcess->mExecutingThreadsCount >= mProcess->mMaxThreads &&
mProcess->mMaxThreads > 1 && mProcess->mStarvationStartTimeMs == 0) {
mProcess->mStarvationStartTimeMs = uptimeMillis();
}
pthread_mutex_unlock(&mProcess->mThreadCountLock);
result = executeCommand(cmd);
pthread_mutex_lock(&mProcess->mThreadCountLock);
mProcess->mExecutingThreadsCount--;
if (mProcess->mExecutingThreadsCount < mProcess->mMaxThreads &&
mProcess->mStarvationStartTimeMs != 0) {
int64_t starvationTimeMs = uptimeMillis() - mProcess->mStarvationStartTimeMs;
if (starvationTimeMs > 100) {
// If there is only a single-threaded client, nobody would be blocked
// on this, and it's not really starvation. (see b/37647467)
ALOGW("All binder threads in pool (%zu threads) busy for %" PRId64 " ms%s",
mProcess->mMaxThreads, starvationTimeMs,
mProcess->mMaxThreads > 1 ? "" : " (may be a false alarm)");
}
mProcess->mStarvationStartTimeMs = 0;
}
pthread_mutex_unlock(&mProcess->mThreadCountLock);
}
if (UNLIKELY(!mPostCommandTasks.empty())) {
// make a copy in case the post transaction task makes a binder
// call and that other process calls back into us
std::vector<std::function<void(void)>> tasks = mPostCommandTasks;
mPostCommandTasks.clear();
for (const auto& func : tasks) {
func();
}
}
return result;
}
// When we've cleared the incoming command queue, process any pending derefs
void IPCThreadState::processPendingDerefs()
{
if (mIn.dataPosition() >= mIn.dataSize()) {
/*
* The decWeak()/decStrong() calls may cause a destructor to run,
* which in turn could have initiated an outgoing transaction,
* which in turn could cause us to add to the pending refs
* vectors; so instead of simply iterating, loop until they're empty.
*
* We do this in an outer loop, because calling decStrong()
* may result in something being added to mPendingWeakDerefs,
* which could be delayed until the next incoming command
* from the driver if we don't process it now.
*/
while (mPendingWeakDerefs.size() > 0 || mPendingStrongDerefs.size() > 0) {
while (mPendingWeakDerefs.size() > 0) {
RefBase::weakref_type* refs = mPendingWeakDerefs[0];
mPendingWeakDerefs.removeAt(0);
refs->decWeak(mProcess.get());
}
if (mPendingStrongDerefs.size() > 0) {
// We don't use while() here because we don't want to re-order
// strong and weak decs at all; if this decStrong() causes both a
// decWeak() and a decStrong() to be queued, we want to process
// the decWeak() first.
BHwBinder* obj = mPendingStrongDerefs[0];
mPendingStrongDerefs.removeAt(0);
obj->decStrong(mProcess.get());
}
}
}
}
void IPCThreadState::processPostWriteDerefs()
{
/*
* libhwbinder has a flushCommands() in the BpHwBinder destructor,
* which makes this function (potentially) reentrant.
* New entries shouldn't be added though, so just iterating until empty
* should be safe.
*/
while (mPostWriteWeakDerefs.size() > 0) {
RefBase::weakref_type* refs = mPostWriteWeakDerefs[0];
mPostWriteWeakDerefs.removeAt(0);
refs->decWeak(mProcess.get());
}
while (mPostWriteStrongDerefs.size() > 0) {
RefBase* obj = mPostWriteStrongDerefs[0];
mPostWriteStrongDerefs.removeAt(0);
obj->decStrong(mProcess.get());
}
}
void IPCThreadState::joinThreadPool(bool isMain)
{
LOG_THREADPOOL("**** THREAD %p (PID %d) IS JOINING THE THREAD POOL\n", (void*)pthread_self(), getpid());
mOut.writeInt32(isMain ? BC_ENTER_LOOPER : BC_REGISTER_LOOPER);
status_t result;
mIsLooper = true;
do {
processPendingDerefs();
// now get the next command to be processed, waiting if necessary
result = getAndExecuteCommand();
if (result < NO_ERROR && result != TIMED_OUT && result != -ECONNREFUSED && result != -EBADF) {
LOG_ALWAYS_FATAL("getAndExecuteCommand(fd=%d) returned unexpected error %d, aborting",
mProcess->mDriverFD, result);
}
// Let this thread exit the thread pool if it is no longer
// needed and it is not the main process thread.
if(result == TIMED_OUT && !isMain) {
break;
}
} while (result != -ECONNREFUSED && result != -EBADF);
LOG_THREADPOOL("**** THREAD %p (PID %d) IS LEAVING THE THREAD POOL err=%d\n",
(void*)pthread_self(), getpid(), result);
mOut.writeInt32(BC_EXIT_LOOPER);
mIsLooper = false;
talkWithDriver(false);
}
int IPCThreadState::setupPolling(int* fd)
{
if (mProcess->mDriverFD < 0) {
return -EBADF;
}
// Tells the kernel to not spawn any additional binder threads,
// as that won't work with polling. Also, the caller is responsible
// for subsequently calling handlePolledCommands()
mProcess->setThreadPoolConfiguration(1, true /* callerWillJoin */);
mIsPollingThread = true;
mOut.writeInt32(BC_ENTER_LOOPER);
*fd = mProcess->mDriverFD;
return 0;
}
status_t IPCThreadState::handlePolledCommands()
{
status_t result;
do {
result = getAndExecuteCommand();
} while (mIn.dataPosition() < mIn.dataSize());
processPendingDerefs();
flushCommands();
return result;
}
void IPCThreadState::stopProcess(bool /*immediate*/)
{
//ALOGI("**** STOPPING PROCESS");
flushCommands();
int fd = mProcess->mDriverFD;
mProcess->mDriverFD = -1;
close(fd);
//kill(getpid(), SIGKILL);
}
status_t IPCThreadState::transact(int32_t handle,
uint32_t code, const Parcel& data,
Parcel* reply, uint32_t flags)
{
status_t err;
flags |= TF_ACCEPT_FDS;
IF_LOG_TRANSACTIONS() {
alog << "BC_TRANSACTION thr " << (void*)pthread_self() << " / hand "
<< handle << " / code " << TypeCode(code) << ": "
<< indent << data << dedent << endl;
}
LOG_ONEWAY(">>>> SEND from pid %d uid %d %s", getpid(), getuid(),
(flags & TF_ONE_WAY) == 0 ? "READ REPLY" : "ONE WAY");
err = writeTransactionData(BC_TRANSACTION_SG, flags, handle, code, data, nullptr);
if (err != NO_ERROR) {
if (reply) reply->setError(err);
return (mLastError = err);
}
if ((flags & TF_ONE_WAY) == 0) {
if (UNLIKELY(mCallRestriction != ProcessState::CallRestriction::NONE)) {
if (mCallRestriction == ProcessState::CallRestriction::ERROR_IF_NOT_ONEWAY) {
ALOGE("Process making non-oneway call (code: %u) but is restricted.", code);
CallStack::logStack("non-oneway call", CallStack::getCurrent(10).get(),
ANDROID_LOG_ERROR);
} else /* FATAL_IF_NOT_ONEWAY */ {
LOG_ALWAYS_FATAL("Process may not make oneway calls (code: %u).", code);
}
}
#if 0
if (code == 4) { // relayout
ALOGI(">>>>>> CALLING transaction 4");
} else {
ALOGI(">>>>>> CALLING transaction %d", code);
}
#endif
if (reply) {
err = waitForResponse(reply);
} else {
Parcel fakeReply;
err = waitForResponse(&fakeReply);
}
#if 0
if (code == 4) { // relayout
ALOGI("<<<<<< RETURNING transaction 4");
} else {
ALOGI("<<<<<< RETURNING transaction %d", code);
}
#endif
IF_LOG_TRANSACTIONS() {
alog << "BR_REPLY thr " << (void*)pthread_self() << " / hand "
<< handle << ": ";
if (reply) alog << indent << *reply << dedent << endl;
else alog << "(none requested)" << endl;
}
} else {
err = waitForResponse(nullptr, nullptr);
}
return err;
}
void IPCThreadState::incStrongHandle(int32_t handle, BpHwBinder *proxy)
{
LOG_REMOTEREFS("IPCThreadState::incStrongHandle(%d)\n", handle);
mOut.writeInt32(BC_ACQUIRE);
mOut.writeInt32(handle);
// Create a temp reference until the driver has handled this command.
proxy->incStrong(mProcess.get());
mPostWriteStrongDerefs.push(proxy);
}
void IPCThreadState::decStrongHandle(int32_t handle)
{
LOG_REMOTEREFS("IPCThreadState::decStrongHandle(%d)\n", handle);
mOut.writeInt32(BC_RELEASE);
mOut.writeInt32(handle);
}
void IPCThreadState::incWeakHandle(int32_t handle, BpHwBinder *proxy)
{
LOG_REMOTEREFS("IPCThreadState::incWeakHandle(%d)\n", handle);
mOut.writeInt32(BC_INCREFS);
mOut.writeInt32(handle);
// Create a temp reference until the driver has handled this command.
proxy->getWeakRefs()->incWeak(mProcess.get());
mPostWriteWeakDerefs.push(proxy->getWeakRefs());
}
void IPCThreadState::decWeakHandle(int32_t handle)
{
LOG_REMOTEREFS("IPCThreadState::decWeakHandle(%d)\n", handle);
mOut.writeInt32(BC_DECREFS);
mOut.writeInt32(handle);
}
status_t IPCThreadState::attemptIncStrongHandle(int32_t handle)
{
#if HAS_BC_ATTEMPT_ACQUIRE
LOG_REMOTEREFS("IPCThreadState::attemptIncStrongHandle(%d)\n", handle);
mOut.writeInt32(BC_ATTEMPT_ACQUIRE);
mOut.writeInt32(0); // xxx was thread priority
mOut.writeInt32(handle);
status_t result = UNKNOWN_ERROR;
waitForResponse(nullptr, &result);
#if LOG_REFCOUNTS
ALOGV("IPCThreadState::attemptIncStrongHandle(%ld) = %s\n",
handle, result == NO_ERROR ? "SUCCESS" : "FAILURE");
#endif
return result;
#else
(void)handle;
ALOGE("%s(%d): Not supported\n", __func__, handle);
return INVALID_OPERATION;
#endif
}
void IPCThreadState::expungeHandle(int32_t handle, IBinder* binder)
{
#if LOG_REFCOUNTS
ALOGV("IPCThreadState::expungeHandle(%ld)\n", handle);
#endif
self()->mProcess->expungeHandle(handle, binder); // NOLINT
}
status_t IPCThreadState::requestDeathNotification(int32_t handle, BpHwBinder* proxy)
{
mOut.writeInt32(BC_REQUEST_DEATH_NOTIFICATION);
mOut.writeInt32((int32_t)handle);
mOut.writePointer((uintptr_t)proxy);
return NO_ERROR;
}
status_t IPCThreadState::clearDeathNotification(int32_t handle, BpHwBinder* proxy)
{
mOut.writeInt32(BC_CLEAR_DEATH_NOTIFICATION);
mOut.writeInt32((int32_t)handle);
mOut.writePointer((uintptr_t)proxy);
return NO_ERROR;
}
IPCThreadState::IPCThreadState()
: mProcess(ProcessState::self()),
mServingStackPointer(nullptr),
mStrictModePolicy(0),
mLastTransactionBinderFlags(0),
mIsLooper(false),
mIsPollingThread(false),
mCallRestriction(mProcess->mCallRestriction) {
pthread_setspecific(gTLS, this);
clearCaller();
mIn.setDataCapacity(256);
mOut.setDataCapacity(256);
}
IPCThreadState::~IPCThreadState()
{
}
status_t IPCThreadState::sendReply(const Parcel& reply, uint32_t flags)
{
status_t err;
status_t statusBuffer;
err = writeTransactionData(BC_REPLY_SG, flags, -1, 0, reply, &statusBuffer);
if (err < NO_ERROR) return err;
return waitForResponse(nullptr, nullptr);
}
status_t IPCThreadState::waitForResponse(Parcel *reply, status_t *acquireResult)
{
uint32_t cmd;
int32_t err;
while (1) {
if ((err=talkWithDriver()) < NO_ERROR) break;
err = mIn.errorCheck();
if (err < NO_ERROR) break;
if (mIn.dataAvail() == 0) continue;
cmd = (uint32_t)mIn.readInt32();
IF_LOG_COMMANDS() {
alog << "Processing waitForResponse Command: "
<< getReturnString(cmd) << endl;
}
switch (cmd) {
case BR_ONEWAY_SPAM_SUSPECT:
ALOGE("Process seems to be sending too many oneway calls.");
CallStack::logStack("oneway spamming", CallStack::getCurrent().get(),
ANDROID_LOG_ERROR);
[[fallthrough]];
case BR_TRANSACTION_COMPLETE:
if (!reply && !acquireResult) goto finish;
break;
case BR_DEAD_REPLY:
err = DEAD_OBJECT;
goto finish;
case BR_FAILED_REPLY:
err = FAILED_TRANSACTION;
goto finish;
case BR_ACQUIRE_RESULT:
{
ALOG_ASSERT(acquireResult != nullptr, "Unexpected brACQUIRE_RESULT");
const int32_t result = mIn.readInt32();
if (!acquireResult) continue;
*acquireResult = result ? NO_ERROR : INVALID_OPERATION;
}
goto finish;
case BR_REPLY:
{
binder_transaction_data tr;
err = mIn.read(&tr, sizeof(tr));
ALOG_ASSERT(err == NO_ERROR, "Not enough command data for brREPLY");
if (err != NO_ERROR) goto finish;
if (reply) {
if ((tr.flags & TF_STATUS_CODE) == 0) {
reply->ipcSetDataReference(
reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer),
tr.data_size,
reinterpret_cast<const binder_size_t*>(tr.data.ptr.offsets),
tr.offsets_size/sizeof(binder_size_t),
freeBuffer, this);
} else {
err = *reinterpret_cast<const status_t*>(tr.data.ptr.buffer);
freeBuffer(nullptr,
reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer),
tr.data_size,
reinterpret_cast<const binder_size_t*>(tr.data.ptr.offsets),
tr.offsets_size/sizeof(binder_size_t), this);
}
} else {
freeBuffer(nullptr,
reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer),
tr.data_size,
reinterpret_cast<const binder_size_t*>(tr.data.ptr.offsets),
tr.offsets_size/sizeof(binder_size_t), this);
continue;
}
}
goto finish;
default:
err = executeCommand(cmd);
if (err != NO_ERROR) goto finish;
break;
}
}
finish:
if (err != NO_ERROR) {
if (acquireResult) *acquireResult = err;
if (reply) reply->setError(err);
mLastError = err;
}
return err;
}
status_t IPCThreadState::talkWithDriver(bool doReceive)
{
if (mProcess->mDriverFD < 0) {
return -EBADF;
}
binder_write_read bwr;
// Is the read buffer empty?
const bool needRead = mIn.dataPosition() >= mIn.dataSize();
// We don't want to write anything if we are still reading
// from data left in the input buffer and the caller
// has requested to read the next data.
const size_t outAvail = (!doReceive || needRead) ? mOut.dataSize() : 0;
bwr.write_size = outAvail;
bwr.write_buffer = (uintptr_t)mOut.data();
// This is what we'll read.
if (doReceive && needRead) {
bwr.read_size = mIn.dataCapacity();
bwr.read_buffer = (uintptr_t)mIn.data();
} else {
bwr.read_size = 0;
bwr.read_buffer = 0;
}
IF_LOG_COMMANDS() {
if (outAvail != 0) {
alog << "Sending commands to driver: " << indent;
const void* cmds = (const void*)bwr.write_buffer;
const void* end = ((const uint8_t*)cmds)+bwr.write_size;
alog << HexDump(cmds, bwr.write_size) << endl;
while (cmds < end) cmds = printCommand(alog, cmds);
alog << dedent;
}
alog << "Size of receive buffer: " << bwr.read_size
<< ", needRead: " << needRead << ", doReceive: " << doReceive << endl;
}
// Return immediately if there is nothing to do.
if ((bwr.write_size == 0) && (bwr.read_size == 0)) return NO_ERROR;
bwr.write_consumed = 0;
bwr.read_consumed = 0;
status_t err;
do {
IF_LOG_COMMANDS() {
alog << "About to read/write, write size = " << mOut.dataSize() << endl;
}
#if defined(__ANDROID__)
if (ioctl(mProcess->mDriverFD, BINDER_WRITE_READ, &bwr) >= 0)
err = NO_ERROR;
else
err = -errno;
#else
err = INVALID_OPERATION;
#endif
if (mProcess->mDriverFD < 0) {
err = -EBADF;
}
IF_LOG_COMMANDS() {
alog << "Finished read/write, write size = " << mOut.dataSize() << endl;
}
} while (err == -EINTR);
IF_LOG_COMMANDS() {
alog << "Our err: " << (void*)(intptr_t)err << ", write consumed: "
<< bwr.write_consumed << " (of " << mOut.dataSize()
<< "), read consumed: " << bwr.read_consumed << endl;
}
if (err >= NO_ERROR) {
if (bwr.write_consumed > 0) {
if (bwr.write_consumed < mOut.dataSize())
LOG_ALWAYS_FATAL("Driver did not consume write buffer. "
"err: %s consumed: %zu of %zu",
statusToString(err).c_str(),
(size_t)bwr.write_consumed,
mOut.dataSize());
else {
mOut.setDataSize(0);
processPostWriteDerefs();
}
}
if (bwr.read_consumed > 0) {
mIn.setDataSize(bwr.read_consumed);
mIn.setDataPosition(0);
}
IF_LOG_COMMANDS() {
alog << "Remaining data size: " << mOut.dataSize() << endl;
alog << "Received commands from driver: " << indent;
const void* cmds = mIn.data();
const void* end = mIn.data() + mIn.dataSize();
alog << HexDump(cmds, mIn.dataSize()) << endl;
while (cmds < end) cmds = printReturnCommand(alog, cmds);
alog << dedent;
}
return NO_ERROR;
}
return err;
}
status_t IPCThreadState::writeTransactionData(int32_t cmd, uint32_t binderFlags,
int32_t handle, uint32_t code, const Parcel& data, status_t* statusBuffer)
{
binder_transaction_data_sg tr_sg;
/* Don't pass uninitialized stack data to a remote process */
tr_sg.transaction_data.target.ptr = 0;
tr_sg.transaction_data.target.handle = handle;
tr_sg.transaction_data.code = code;
tr_sg.transaction_data.flags = binderFlags;
tr_sg.transaction_data.cookie = 0;
tr_sg.transaction_data.sender_pid = 0;
tr_sg.transaction_data.sender_euid = 0;