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android / platform / frameworks / native / refs/heads/main / . / libs / binder / 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 "IPCThreadState"
#include <binder/IPCThreadState.h>
#include <binder/Binder.h>
#include <binder/BpBinder.h>
#include <binder/TextOutput.h>
#include <cutils/sched_policy.h>
#include <utils/CallStack.h>
#include <utils/Log.h>
#include <utils/SystemClock.h>
#include <atomic>
#include <errno.h>
#include <inttypes.h>
#include <pthread.h>
#include <sched.h>
#include <signal.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/resource.h>
#include <unistd.h>
#include "binder_module.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 {
// 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_TRANSACTION_SEC_CTX",
"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_PENDING_FROZEN",
};
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 int64_t kWorkSourcePropagatedBitIndex = 32;
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(std::ostream& 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 << "\ttarget.desc=" << btd->target.handle;
} else {
out << "\ttarget.ptr=" << btd->target.ptr;
}
out << "\t (cookie " << btd->cookie << ")\n"
<< "\tcode=" << TypeCode(btd->code) << ", flags=" << (void*)(uint64_t)btd->flags << "\n"
<< "\tdata=" << btd->data.ptr.buffer << " (" << (void*)btd->data_size << " bytes)\n"
<< "\toffsets=" << btd->data.ptr.offsets << " (" << (void*)btd->offsets_size << " bytes)\n";
return btd + 1;
}
static const void* printBinderTransactionDataSecCtx(std::ostream& out, const void* data) {
const binder_transaction_data_secctx* btd = (const binder_transaction_data_secctx*)data;
printBinderTransactionData(out, &btd->transaction_data);
char* secctx = (char*)btd->secctx;
out << "\tsecctx=" << secctx << "\n";
return btd+1;
}
static const void* printReturnCommand(std::ostream& 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 << "\tBR_ERROR: " << (void*)(uint64_t)(*cmd++) << "\n";
return cmd;
} else if (cmdIndex >= N) {
out << "\tUnknown reply: " << code << "\n";
return cmd;
}
out << "\t" << kReturnStrings[cmdIndex];
switch (code) {
case BR_TRANSACTION_SEC_CTX: {
out << ": ";
cmd = (const int32_t*)printBinderTransactionDataSecCtx(out, cmd);
} break;
case BR_TRANSACTION:
case BR_REPLY: {
out << ": ";
cmd = (const int32_t*)printBinderTransactionData(out, cmd);
} 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*)(uint64_t)b << " (cookie " << (void*)(uint64_t)c << ")";
} break;
case BR_ATTEMPT_ACQUIRE: {
const int32_t p = *cmd++;
const int32_t b = *cmd++;
const int32_t c = *cmd++;
out << ": target=" << (void*)(uint64_t)b << " (cookie " << (void*)(uint64_t)c
<< "), pri=" << p;
} break;
case BR_DEAD_BINDER:
case BR_CLEAR_DEATH_NOTIFICATION_DONE: {
const int32_t c = *cmd++;
out << ": death cookie " << (void*)(uint64_t)c;
} break;
default:
// no details to show for: BR_OK, BR_DEAD_REPLY,
// BR_TRANSACTION_COMPLETE, BR_FINISHED
break;
}
out << "\n";
return cmd;
}
static const void* printCommand(std::ostream& 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 << "\n";
return cmd;
}
out << kCommandStrings[cmdIndex];
switch (code) {
case BC_TRANSACTION:
case BC_REPLY: {
out << ": ";
cmd = (const int32_t*)printBinderTransactionData(out, cmd);
} 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*)(uint64_t)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*)(uint64_t)b << " (cookie " << (void*)(uint64_t)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*)(uint64_t)c << ")";
} break;
case BC_DEAD_BINDER_DONE: {
const int32_t c = *cmd++;
out << ": death cookie " << (void*)(uint64_t)c;
} break;
default:
// no details to show for: BC_REGISTER_LOOPER, BC_ENTER_LOOPER,
// BC_EXIT_LOOPER
break;
}
out << "\n";
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;
static std::atomic<bool> gDisableBackgroundScheduling = 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);
}
}
void IPCThreadState::disableBackgroundScheduling(bool disable)
{
gDisableBackgroundScheduling.store(disable, std::memory_order_relaxed);
}
bool IPCThreadState::backgroundSchedulingDisabled()
{
return gDisableBackgroundScheduling.load(std::memory_order_relaxed);
}
status_t IPCThreadState::clearLastError()
{
const status_t err = mLastError;
mLastError = NO_ERROR;
return err;
}
pid_t IPCThreadState::getCallingPid() const
{
checkContextIsBinderForUse(__func__);
return mCallingPid;
}
const char* IPCThreadState::getCallingSid() const
{
checkContextIsBinderForUse(__func__);
return mCallingSid;
}
uid_t IPCThreadState::getCallingUid() const
{
checkContextIsBinderForUse(__func__);
return mCallingUid;
}
const IPCThreadState::SpGuard* IPCThreadState::pushGetCallingSpGuard(const SpGuard* guard) {
const SpGuard* orig = mServingStackPointerGuard;
mServingStackPointerGuard = guard;
return orig;
}
void IPCThreadState::restoreGetCallingSpGuard(const SpGuard* guard) {
mServingStackPointerGuard = guard;
}
void IPCThreadState::checkContextIsBinderForUse(const char* use) const {
if (mServingStackPointerGuard == nullptr) [[likely]] {
return;
}
if (!mServingStackPointer || mServingStackPointerGuard->address < mServingStackPointer) {
LOG_ALWAYS_FATAL("In context %s, %s does not make sense (binder sp: %p, guard: %p).",
mServingStackPointerGuard->context, use, mServingStackPointer,
mServingStackPointerGuard->address);
}
// in the case mServingStackPointer is deeper in the stack than the guard,
// we must be serving a binder transaction (maybe nested). This is a binder
// context, so we don't abort
}
constexpr uint32_t encodeExplicitIdentity(bool hasExplicitIdentity, pid_t callingPid) {
uint32_t as_unsigned = static_cast<uint32_t>(callingPid);
if (hasExplicitIdentity) {
return as_unsigned | (1 << 30);
} else {
return as_unsigned & ~(1 << 30);
}
}
constexpr int64_t packCallingIdentity(bool hasExplicitIdentity, uid_t callingUid,
pid_t callingPid) {
// Calling PID is a 32-bit signed integer, but doesn't consume the entire 32 bit space.
// To future-proof this and because we have extra capacity, we decided to also support -1,
// since this constant is used to represent invalid UID in other places of the system.
// Thus, we pack hasExplicitIdentity into the 2nd bit from the left. This allows us to
// preserve the (left-most) bit for the sign while also encoding the value of
// hasExplicitIdentity.
// 32b | 1b | 1b | 30b
// token = [ calling uid | calling pid(sign) | has explicit identity | calling pid(rest) ]
uint64_t token = (static_cast<uint64_t>(callingUid) << 32) |
encodeExplicitIdentity(hasExplicitIdentity, callingPid);
return static_cast<int64_t>(token);
}
constexpr bool unpackHasExplicitIdentity(int64_t token) {
return static_cast<int32_t>(token) & (1 << 30);
}
constexpr uid_t unpackCallingUid(int64_t token) {
return static_cast<uid_t>(token >> 32);
}
constexpr pid_t unpackCallingPid(int64_t token) {
int32_t encodedPid = static_cast<int32_t>(token);
if (encodedPid & (1 << 31)) {
return encodedPid | (1 << 30);
} else {
return encodedPid & ~(1 << 30);
}
}
static_assert(unpackHasExplicitIdentity(packCallingIdentity(true, 1000, 9999)) == true,
"pack true hasExplicit");
static_assert(unpackCallingUid(packCallingIdentity(true, 1000, 9999)) == 1000, "pack true uid");
static_assert(unpackCallingPid(packCallingIdentity(true, 1000, 9999)) == 9999, "pack true pid");
static_assert(unpackHasExplicitIdentity(packCallingIdentity(false, 1000, 9999)) == false,
"pack false hasExplicit");
static_assert(unpackCallingUid(packCallingIdentity(false, 1000, 9999)) == 1000, "pack false uid");
static_assert(unpackCallingPid(packCallingIdentity(false, 1000, 9999)) == 9999, "pack false pid");
static_assert(unpackHasExplicitIdentity(packCallingIdentity(true, 1000, -1)) == true,
"pack true (negative) hasExplicit");
static_assert(unpackCallingUid(packCallingIdentity(true, 1000, -1)) == 1000,
"pack true (negative) uid");
static_assert(unpackCallingPid(packCallingIdentity(true, 1000, -1)) == -1,
"pack true (negative) pid");
static_assert(unpackHasExplicitIdentity(packCallingIdentity(false, 1000, -1)) == false,
"pack false (negative) hasExplicit");
static_assert(unpackCallingUid(packCallingIdentity(false, 1000, -1)) == 1000,
"pack false (negative) uid");
static_assert(unpackCallingPid(packCallingIdentity(false, 1000, -1)) == -1,
"pack false (negative) pid");
int64_t IPCThreadState::clearCallingIdentity()
{
// ignore mCallingSid for legacy reasons
int64_t token = packCallingIdentity(mHasExplicitIdentity, mCallingUid, mCallingPid);
clearCaller();
mHasExplicitIdentity = true;
return token;
}
bool IPCThreadState::hasExplicitIdentity() {
return mHasExplicitIdentity;
}
void IPCThreadState::setStrictModePolicy(int32_t policy)
{
mStrictModePolicy = policy;
}
int32_t IPCThreadState::getStrictModePolicy() const
{
return mStrictModePolicy;
}
int64_t IPCThreadState::setCallingWorkSourceUid(uid_t uid)
{
int64_t token = setCallingWorkSourceUidWithoutPropagation(uid);
mPropagateWorkSource = true;
return token;
}
int64_t IPCThreadState::setCallingWorkSourceUidWithoutPropagation(uid_t uid)
{
const int64_t propagatedBit = ((int64_t)mPropagateWorkSource) << kWorkSourcePropagatedBitIndex;
int64_t token = propagatedBit | mWorkSource;
mWorkSource = uid;
return token;
}
void IPCThreadState::clearPropagateWorkSource()
{
mPropagateWorkSource = false;
}
bool IPCThreadState::shouldPropagateWorkSource() const
{
return mPropagateWorkSource;
}
uid_t IPCThreadState::getCallingWorkSourceUid() const
{
return mWorkSource;
}
int64_t IPCThreadState::clearCallingWorkSource()
{
return setCallingWorkSourceUid(kUnsetWorkSource);
}
void IPCThreadState::restoreCallingWorkSource(int64_t token)
{
uid_t uid = (int)token;
setCallingWorkSourceUidWithoutPropagation(uid);
mPropagateWorkSource = ((token >> kWorkSourcePropagatedBitIndex) & 1) == 1;
}
void IPCThreadState::setLastTransactionBinderFlags(int32_t flags)
{
mLastTransactionBinderFlags = flags;
}
int32_t IPCThreadState::getLastTransactionBinderFlags() const
{
return mLastTransactionBinderFlags;
}
void IPCThreadState::setCallRestriction(ProcessState::CallRestriction restriction) {
mCallRestriction = restriction;
}
ProcessState::CallRestriction IPCThreadState::getCallRestriction() const {
return mCallRestriction;
}
void IPCThreadState::restoreCallingIdentity(int64_t token)
{
mCallingUid = unpackCallingUid(token);
mCallingSid = nullptr; // not enough data to restore
mCallingPid = unpackCallingPid(token);
mHasExplicitIdentity = unpackHasExplicitIdentity(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()");
}
}
bool IPCThreadState::flushIfNeeded()
{
if (mIsLooper || mServingStackPointer != nullptr || mIsFlushing) {
return false;
}
mIsFlushing = true;
// In case this thread is not a looper and is not currently serving a binder transaction,
// there's no guarantee that this thread will call back into the kernel driver any time
// soon. Therefore, flush pending commands such as BC_FREE_BUFFER, to prevent them from getting
// stuck in this thread's out buffer.
flushCommands();
mIsFlushing = false;
return true;
}
void IPCThreadState::blockUntilThreadAvailable()
{
pthread_mutex_lock(&mProcess->mThreadCountLock);
mProcess->mWaitingForThreads++;
while (mProcess->mExecutingThreadsCount >= mProcess->mMaxThreads) {
ALOGW("Waiting for thread to be free. mExecutingThreadsCount=%lu mMaxThreads=%lu\n",
static_cast<unsigned long>(mProcess->mExecutingThreadsCount),
static_cast<unsigned long>(mProcess->mMaxThreads));
pthread_cond_wait(&mProcess->mThreadCountDecrement, &mProcess->mThreadCountLock);
}
mProcess->mWaitingForThreads--;
pthread_mutex_unlock(&mProcess->mThreadCountLock);
}
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() {
std::ostringstream logStream;
logStream << "Processing top-level Command: " << getReturnString(cmd) << "\n";
std::string message = logStream.str();
ALOGI("%s", message.c_str());
}
pthread_mutex_lock(&mProcess->mThreadCountLock);
mProcess->mExecutingThreadsCount++;
if (mProcess->mExecutingThreadsCount >= mProcess->mMaxThreads &&
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) {
ALOGE("binder thread pool (%zu threads) starved for %" PRId64 " ms",
mProcess->mMaxThreads, starvationTimeMs);
}
mProcess->mStarvationStartTimeMs = 0;
}
// Cond broadcast can be expensive, so don't send it every time a binder
// call is processed. b/168806193
if (mProcess->mWaitingForThreads > 0) {
pthread_cond_broadcast(&mProcess->mThreadCountDecrement);
}
pthread_mutex_unlock(&mProcess->mThreadCountLock);
}
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.
BBinder* obj = mPendingStrongDerefs[0];
mPendingStrongDerefs.removeAt(0);
obj->decStrong(mProcess.get());
}
}
}
}
void IPCThreadState::processPostWriteDerefs()
{
for (size_t i = 0; i < mPostWriteWeakDerefs.size(); i++) {
RefBase::weakref_type* refs = mPostWriteWeakDerefs[i];
refs->decWeak(mProcess.get());
}
mPostWriteWeakDerefs.clear();
for (size_t i = 0; i < mPostWriteStrongDerefs.size(); i++) {
RefBase* obj = mPostWriteStrongDerefs[i];
obj->decStrong(mProcess.get());
}
mPostWriteStrongDerefs.clear();
}
void IPCThreadState::joinThreadPool(bool isMain)
{
LOG_THREADPOOL("**** THREAD %p (PID %d) IS JOINING THE THREAD POOL\n", (void*)pthread_self(), getpid());
pthread_mutex_lock(&mProcess->mThreadCountLock);
mProcess->mCurrentThreads++;
pthread_mutex_unlock(&mProcess->mThreadCountLock);
mOut.writeInt32(isMain ? BC_ENTER_LOOPER : BC_REGISTER_LOOPER);
mIsLooper = true;
status_t result;
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);
pthread_mutex_lock(&mProcess->mThreadCountLock);
LOG_ALWAYS_FATAL_IF(mProcess->mCurrentThreads == 0,
"Threadpool thread count = 0. Thread cannot exist and exit in empty "
"threadpool\n"
"Misconfiguration. Increase threadpool max threads configuration\n");
mProcess->mCurrentThreads--;
pthread_mutex_unlock(&mProcess->mThreadCountLock);
}
status_t IPCThreadState::setupPolling(int* fd)
{
if (mProcess->mDriverFD < 0) {
return -EBADF;
}
mOut.writeInt32(BC_ENTER_LOOPER);
flushCommands();
*fd = mProcess->mDriverFD;
pthread_mutex_lock(&mProcess->mThreadCountLock);
mProcess->mCurrentThreads++;
pthread_mutex_unlock(&mProcess->mThreadCountLock);
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)
{
LOG_ALWAYS_FATAL_IF(data.isForRpc(), "Parcel constructed for RPC, but being used with binder.");
status_t err;
flags |= TF_ACCEPT_FDS;
IF_LOG_TRANSACTIONS() {
std::ostringstream logStream;
logStream << "BC_TRANSACTION thr " << (void*)pthread_self() << " / hand " << handle
<< " / code " << TypeCode(code) << ": \t" << data << "\n";
std::string message = logStream.str();
ALOGI("%s", message.c_str());
}
LOG_ONEWAY(">>>> SEND from pid %d uid %d %s", getpid(), getuid(),
(flags & TF_ONE_WAY) == 0 ? "READ REPLY" : "ONE WAY");
err = writeTransactionData(BC_TRANSACTION, flags, handle, code, data, nullptr);
if (err != NO_ERROR) {
if (reply) reply->setError(err);
return (mLastError = err);
}
if ((flags & TF_ONE_WAY) == 0) {
if (mCallRestriction != ProcessState::CallRestriction::NONE) [[unlikely]] {
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 non-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() {
std::ostringstream logStream;
logStream << "BR_REPLY thr " << (void*)pthread_self() << " / hand " << handle << ": ";
if (reply)
logStream << "\t" << *reply << "\n";
else
logStream << "(none requested)"
<< "\n";
std::string message = logStream.str();
ALOGI("%s", message.c_str());
}
} else {
err = waitForResponse(nullptr, nullptr);
}
return err;
}
void IPCThreadState::incStrongHandle(int32_t handle, BpBinder *proxy)
{
LOG_REMOTEREFS("IPCThreadState::incStrongHandle(%d)\n", handle);
mOut.writeInt32(BC_ACQUIRE);
mOut.writeInt32(handle);
if (!flushIfNeeded()) {
// 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);
flushIfNeeded();
}
void IPCThreadState::incWeakHandle(int32_t handle, BpBinder *proxy)
{
LOG_REMOTEREFS("IPCThreadState::incWeakHandle(%d)\n", handle);
mOut.writeInt32(BC_INCREFS);
mOut.writeInt32(handle);
if (!flushIfNeeded()) {
// 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);
flushIfNeeded();
}
status_t IPCThreadState::attemptIncStrongHandle(int32_t handle) {
(void)handle;
ALOGE("%s(%d): Not supported\n", __func__, handle);
return INVALID_OPERATION;
}
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, BpBinder* 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, BpBinder* 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),
mServingStackPointerGuard(nullptr),
mWorkSource(kUnsetWorkSource),
mPropagateWorkSource(false),
mIsLooper(false),
mIsFlushing(false),
mStrictModePolicy(0),
mLastTransactionBinderFlags(0),
mCallRestriction(mProcess->mCallRestriction) {
pthread_setspecific(gTLS, this);
clearCaller();
mHasExplicitIdentity = false;
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, 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() {
std::ostringstream logStream;
logStream << "Processing waitForResponse Command: " << getReturnString(cmd) << "\n";
std::string message = logStream.str();
ALOGI("%s", message.c_str());
}
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_TRANSACTION_PENDING_FROZEN:
ALOGW("Sending oneway calls to frozen process.");
goto finish;
case BR_DEAD_REPLY:
err = DEAD_OBJECT;
goto finish;
case BR_FAILED_REPLY:
err = FAILED_TRANSACTION;
goto finish;
case BR_FROZEN_REPLY:
err = FAILED_TRANSACTION;
goto finish;
case BR_ACQUIRE_RESULT:
{
ALOG_ASSERT(acquireResult != NULL, "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);
} else {
err = *reinterpret_cast<const status_t*>(tr.data.ptr.buffer);
freeBuffer(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));
}
} else {
freeBuffer(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));
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;
logExtendedError();
}
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() {
std::ostringstream logStream;
if (outAvail != 0) {
logStream << "Sending commands to driver: ";
const void* cmds = (const void*)bwr.write_buffer;
const void* end = ((const uint8_t*)cmds) + bwr.write_size;
logStream << "\t" << HexDump(cmds, bwr.write_size) << "\n";
while (cmds < end) cmds = printCommand(logStream, cmds);
}
logStream << "Size of receive buffer: " << bwr.read_size << ", needRead: " << needRead
<< ", doReceive: " << doReceive << "\n";
std::string message = logStream.str();
ALOGI("%s", message.c_str());
}
// 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() {
std::ostringstream logStream;
logStream << "About to read/write, write size = " << mOut.dataSize() << "\n";
std::string message = logStream.str();
ALOGI("%s", message.c_str());
}
#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() {
std::ostringstream logStream;
logStream << "Finished read/write, write size = " << mOut.dataSize() << "\n";
std::string message = logStream.str();
ALOGI("%s", message.c_str());
}
} while (err == -EINTR);
IF_LOG_COMMANDS() {
std::ostringstream logStream;
logStream << "Our err: " << (void*)(intptr_t)err
<< ", write consumed: " << bwr.write_consumed << " (of " << mOut.dataSize()
<< "), read consumed: " << bwr.read_consumed << "\n";
std::string message = logStream.str();
ALOGI("%s", message.c_str());
}
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() {
std::ostringstream logStream;
logStream << "Remaining data size: " << mOut.dataSize() << "\n";
logStream << "Received commands from driver: ";
const void* cmds = mIn.data();
const void* end = mIn.data() + mIn.dataSize();
logStream << "\t" << HexDump(cmds, mIn.dataSize()) << "\n";
while (cmds < end) cmds = printReturnCommand(logStream, cmds);
std::string message = logStream.str();
ALOGI("%s", message.c_str());
}
return NO_ERROR;
}
ALOGE_IF(mProcess->mDriverFD >= 0,
"Driver returned error (%s). This is a bug in either libbinder or the driver. This "
"thread's connection to %s will no longer work.",
statusToString(err).c_str(), mProcess->mDriverName.c_str());
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 tr;
tr.target.ptr = 0; /* Don't pass uninitialized stack data to a remote process */
tr.target.handle = handle;
tr.code = code;
tr.flags = binderFlags;
tr.cookie = 0;
tr.sender_pid = 0;
tr.sender_euid = 0;
const status_t err = data.errorCheck();
if (err == NO_ERROR) {
tr.data_size = data.ipcDataSize();
tr.data.ptr.buffer = data.ipcData();
tr.offsets_size = data.ipcObjectsCount()*sizeof(binder_size_t);
tr.data.ptr.offsets = data.ipcObjects();
} else if (statusBuffer) {
tr.flags |= TF_STATUS_CODE;
*statusBuffer = err;
tr.data_size = sizeof(status_t);
tr.data.ptr.buffer = reinterpret_cast<uintptr_t>(statusBuffer);
tr.offsets_size = 0;
tr.data.ptr.offsets = 0;
} else {
return (mLastError = err);
}
mOut.writeInt32(cmd);
mOut.write(&tr, sizeof(tr));
return NO_ERROR;
}
sp<BBinder> the_context_object;
void IPCThreadState::setTheContextObject(const sp<BBinder>& obj)
{
the_context_object = obj;
}
status_t IPCThreadState::executeCommand(int32_t cmd)
{
BBinder* obj;
RefBase::weakref_type* refs;
status_t result = NO_ERROR;
switch ((uint32_t)cmd) {
case BR_ERROR:
result = mIn.readInt32();
break;
case BR_OK:
break;
case BR_ACQUIRE:
refs = (RefBase::weakref_type*)mIn.readPointer();
obj = (BBinder*)mIn.readPointer();
ALOG_ASSERT(refs->refBase() == obj,
"BR_ACQUIRE: object %p does not match cookie %p (expected %p)",
refs, obj, refs->refBase());
obj->incStrong(mProcess.get());
IF_LOG_REMOTEREFS() {
LOG_REMOTEREFS("BR_ACQUIRE from driver on %p", obj);
obj->printRefs();
}
mOut.writeInt32(BC_ACQUIRE_DONE);
mOut.writePointer((uintptr_t)refs);
mOut.writePointer((uintptr_t)obj);
break;
case BR_RELEASE:
refs = (RefBase::weakref_type*)mIn.readPointer();
obj = (BBinder*)mIn.readPointer();
ALOG_ASSERT(refs->refBase() == obj,
"BR_RELEASE: object %p does not match cookie %p (expected %p)",
refs, obj, refs->refBase());
IF_LOG_REMOTEREFS() {
LOG_REMOTEREFS("BR_RELEASE from driver on %p", obj);
obj->printRefs();
}
mPendingStrongDerefs.push(obj);
break;
case BR_INCREFS:
refs = (RefBase::weakref_type*)mIn.readPointer();
obj = (BBinder*)mIn.readPointer();
refs->incWeak(mProcess.get());
mOut.writeInt32(BC_INCREFS_DONE);
mOut.writePointer((uintptr_t)refs);
mOut.writePointer((uintptr_t)obj);
break;
case BR_DECREFS:
refs = (RefBase::weakref_type*)mIn.readPointer();
// NOLINTNEXTLINE(clang-analyzer-deadcode.DeadStores)
obj = (BBinder*)mIn.readPointer(); // consume
// NOTE: This assertion is not valid, because the object may no
// longer exist (thus the (BBinder*)cast above resulting in a different
// memory address).
//ALOG_ASSERT(refs->refBase() == obj,
// "BR_DECREFS: object %p does not match cookie %p (expected %p)",
// refs, obj, refs->refBase());
mPendingWeakDerefs.push(refs);
break;
case BR_ATTEMPT_ACQUIRE:
refs = (RefBase::weakref_type*)mIn.readPointer();
obj = (BBinder*)mIn.readPointer();
{
const bool success = refs->attemptIncStrong(mProcess.get());
ALOG_ASSERT(success && refs->refBase() == obj,
"BR_ATTEMPT_ACQUIRE: object %p does not match cookie %p (expected %p)",
refs, obj, refs->refBase());
mOut.writeInt32(BC_ACQUIRE_RESULT);
mOut.writeInt32((int32_t)success);
}
break;
case BR_TRANSACTION_SEC_CTX:
case BR_TRANSACTION:
{
binder_transaction_data_secctx tr_secctx;
binder_transaction_data& tr = tr_secctx.transaction_data;
if (cmd == (int) BR_TRANSACTION_SEC_CTX) {
result = mIn.read(&tr_secctx, sizeof(tr_secctx));
} else {
result = mIn.read(&tr, sizeof(tr));
tr_secctx.secctx = 0;
}
ALOG_ASSERT(result == NO_ERROR,
"Not enough command data for brTRANSACTION");
if (result != NO_ERROR) break;
Parcel buffer;
buffer.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);
const void* origServingStackPointer = mServingStackPointer;
mServingStackPointer = __builtin_frame_address(0);
const pid_t origPid = mCallingPid;
const char* origSid = mCallingSid;
const uid_t origUid = mCallingUid;
const bool origHasExplicitIdentity = mHasExplicitIdentity;
const int32_t origStrictModePolicy = mStrictModePolicy;
const int32_t origTransactionBinderFlags = mLastTransactionBinderFlags;
const int32_t origWorkSource = mWorkSource;
const bool origPropagateWorkSet = mPropagateWorkSource;
// Calling work source will be set by Parcel#enforceInterface. Parcel#enforceInterface
// is only guaranteed to be called for AIDL-generated stubs so we reset the work source
// here to never propagate it.
clearCallingWorkSource();
clearPropagateWorkSource();
mCallingPid = tr.sender_pid;
mCallingSid = reinterpret_cast<const char*>(tr_secctx.secctx);
mCallingUid = tr.sender_euid;
mHasExplicitIdentity = false;
mLastTransactionBinderFlags = tr.flags;
// ALOGI(">>>> TRANSACT from pid %d sid %s uid %d\n", mCallingPid,
// (mCallingSid ? mCallingSid : "<N/A>"), mCallingUid);
Parcel reply;
status_t error;
IF_LOG_TRANSACTIONS() {
std::ostringstream logStream;
logStream << "BR_TRANSACTION thr " << (void*)pthread_self() << " / obj "
<< tr.target.ptr << " / code " << TypeCode(tr.code) << ": \t" << buffer
<< "\n"
<< "Data addr = " << reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer)
<< ", offsets addr="
<< reinterpret_cast<const size_t*>(tr.data.ptr.offsets) << "\n";
std::string message = logStream.str();
ALOGI("%s", message.c_str());
}
if (tr.target.ptr) {
// We only have a weak reference on the target object, so we must first try to
// safely acquire a strong reference before doing anything else with it.
if (reinterpret_cast<RefBase::weakref_type*>(
tr.target.ptr)->attemptIncStrong(this)) {
error = reinterpret_cast<BBinder*>(tr.cookie)->transact(tr.code, buffer,
&reply, tr.flags);
reinterpret_cast<BBinder*>(tr.cookie)->decStrong(this);
} else {
error = UNKNOWN_TRANSACTION;
}
} else {
error = the_context_object->transact(tr.code, buffer, &reply, tr.flags);
}
//ALOGI("<<<< TRANSACT from pid %d restore pid %d sid %s uid %d\n",
// mCallingPid, origPid, (origSid ? origSid : "<N/A>"), origUid);
if ((tr.flags & TF_ONE_WAY) == 0) {
LOG_ONEWAY("Sending reply to %d!", mCallingPid);
if (error < NO_ERROR) reply.setError(error);
// b/238777741: clear buffer before we send the reply.
// Otherwise, there is a race where the client may
// receive the reply and send another transaction
// here and the space used by this transaction won't
// be freed for the client.
buffer.setDataSize(0);
constexpr uint32_t kForwardReplyFlags = TF_CLEAR_BUF;
sendReply(reply, (tr.flags & kForwardReplyFlags));
} else {
if (error != OK) {
std::ostringstream logStream;
logStream << "oneway function results for code " << tr.code << " on binder at "
<< reinterpret_cast<void*>(tr.target.ptr)
<< " will be dropped but finished with status "
<< statusToString(error);
// ideally we could log this even when error == OK, but it
// causes too much logspam because some manually-written
// interfaces have clients that call methods which always
// write results, sometimes as oneway methods.
if (reply.dataSize() != 0) {
logStream << " and reply parcel size " << reply.dataSize();
}
std::string message = logStream.str();
ALOGI("%s", message.c_str());
}
LOG_ONEWAY("NOT sending reply to %d!", mCallingPid);
}
mServingStackPointer = origServingStackPointer;
mCallingPid = origPid;
mCallingSid = origSid;
mCallingUid = origUid;
mHasExplicitIdentity = origHasExplicitIdentity;
mStrictModePolicy = origStrictModePolicy;
mLastTransactionBinderFlags = origTransactionBinderFlags;
mWorkSource = origWorkSource;
mPropagateWorkSource = origPropagateWorkSet;
IF_LOG_TRANSACTIONS() {
std::ostringstream logStream;
logStream << "BC_REPLY thr " << (void*)pthread_self() << " / obj " << tr.target.ptr
<< ": \t" << reply << "\n";
std::string message = logStream.str();
ALOGI("%s", message.c_str());
}
}
break;
case BR_DEAD_BINDER:
{
BpBinder *proxy = (BpBinder*)mIn.readPointer();
proxy->sendObituary();
mOut.writeInt32(BC_DEAD_BINDER_DONE);
mOut.writePointer((uintptr_t)proxy);
} break;
case BR_CLEAR_DEATH_NOTIFICATION_DONE:
{
BpBinder *proxy = (BpBinder*)mIn.readPointer();
proxy->getWeakRefs()->decWeak(proxy);
} break;
case BR_FINISHED:
result = TIMED_OUT;
break;
case BR_NOOP:
break;
case BR_SPAWN_LOOPER:
mProcess->spawnPooledThread(false);
break;
default:
ALOGE("*** BAD COMMAND %d received from Binder driver\n", cmd);
result = UNKNOWN_ERROR;
break;
}
if (result != NO_ERROR) {
mLastError = result;
}
return result;
}
const void* IPCThreadState::getServingStackPointer() const {
return mServingStackPointer;
}
void IPCThreadState::threadDestructor(void *st)
{
IPCThreadState* const self = static_cast<IPCThreadState*>(st);
if (self) {
self->flushCommands();
#if defined(__ANDROID__)
if (self->mProcess->mDriverFD >= 0) {
ioctl(self->mProcess->mDriverFD, BINDER_THREAD_EXIT, 0);
}
#endif
delete self;
}
}
status_t IPCThreadState::getProcessFreezeInfo(pid_t pid, uint32_t *sync_received,
uint32_t *async_received)
{
int ret = 0;
binder_frozen_status_info info = {};
info.pid = pid;
#if defined(__ANDROID__)
if (ioctl(self()->mProcess->mDriverFD, BINDER_GET_FROZEN_INFO, &info) < 0)
ret = -errno;
#endif
*sync_received = info.sync_recv;
*async_received = info.async_recv;
return ret;
}
status_t IPCThreadState::freeze(pid_t pid, bool enable, uint32_t timeout_ms) {
struct binder_freeze_info info;
int ret = 0;
info.pid = pid;
info.enable = enable;
info.timeout_ms = timeout_ms;
#if defined(__ANDROID__)
if (ioctl(self()->mProcess->mDriverFD, BINDER_FREEZE, &info) < 0)
ret = -errno;
#endif
//
// ret==-EAGAIN indicates that transactions have not drained.
// Call again to poll for completion.
//
return ret;
}
void IPCThreadState::logExtendedError() {
struct binder_extended_error ee = {.command = BR_OK};
if (!ProcessState::isDriverFeatureEnabled(ProcessState::DriverFeature::EXTENDED_ERROR))
return;
#if defined(__ANDROID__)
if (ioctl(self()->mProcess->mDriverFD, BINDER_GET_EXTENDED_ERROR, &ee) < 0) {
ALOGE("Failed to get extended error: %s", strerror(errno));
return;
}
#endif
ALOGE_IF(ee.command != BR_OK, "Binder transaction failure: %d/%d/%d",
ee.id, ee.command, ee.param);
}
void IPCThreadState::freeBuffer(const uint8_t* data, size_t /*dataSize*/,
const binder_size_t* /*objects*/, size_t /*objectsSize*/) {
//ALOGI("Freeing parcel %p", &parcel);
IF_LOG_COMMANDS() {
std::ostringstream logStream;
logStream << "Writing BC_FREE_BUFFER for " << data << "\n";
std::string message = logStream.str();
ALOGI("%s", message.c_str());
}
ALOG_ASSERT(data != NULL, "Called with NULL data");
IPCThreadState* state = self();
state->mOut.writeInt32(BC_FREE_BUFFER);
state->mOut.writePointer((uintptr_t)data);
state->flushIfNeeded();
}
} // namespace android