replicant-frameworks_native/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/Log.h>
#include <utils/threads.h>
#include <private/binder/binder_module.h>
#include <private/binder/Static.h>
#include <errno.h>
#include <pthread.h>
#include <sched.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 {
static const char* getReturnString(size_t idx);
static const void* printReturnCommand(TextOutput& out, const void* _cmd);
static const void* printCommand(TextOutput& out, const void* _cmd);
// 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"
};
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(size_t idx)
{
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 bool gHaveTLS = false;
static pthread_key_t gTLS = 0;
static bool gShutdown = false;
static bool gDisableBackgroundScheduling = false;
IPCThreadState* IPCThreadState::self()
{
if (gHaveTLS) {
restart:
const pthread_key_t k = gTLS;
IPCThreadState* st = (IPCThreadState*)pthread_getspecific(k);
if (st) return st;
return new IPCThreadState;
}
if (gShutdown) return NULL;
pthread_mutex_lock(&gTLSMutex);
if (!gHaveTLS) {
if (pthread_key_create(&gTLS, threadDestructor) != 0) {
pthread_mutex_unlock(&gTLSMutex);
return NULL;
}
gHaveTLS = true;
}
pthread_mutex_unlock(&gTLSMutex);
goto restart;
}
IPCThreadState* IPCThreadState::selfOrNull()
{
if (gHaveTLS) {
const pthread_key_t k = gTLS;
IPCThreadState* st = (IPCThreadState*)pthread_getspecific(k);
return st;
}
return NULL;
}
void IPCThreadState::shutdown()
{
gShutdown = true;
if (gHaveTLS) {
// XXX Need to wait for all thread pool threads to exit!
IPCThreadState* st = (IPCThreadState*)pthread_getspecific(gTLS);
if (st) {
delete st;
pthread_setspecific(gTLS, NULL);
}
gHaveTLS = false;
}
}
void IPCThreadState::disableBackgroundScheduling(bool disable)
{
gDisableBackgroundScheduling = disable;
}
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;
}
uid_t IPCThreadState::getCallingUid() const
{
return mCallingUid;
}
int64_t IPCThreadState::clearCallingIdentity()
{
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);
mCallingPid = (int)token;
}
void IPCThreadState::clearCaller()
{
mCallingPid = getpid();
mCallingUid = getuid();
}
void IPCThreadState::flushCommands()
{
if (mProcess->mDriverFD <= 0)
return;
talkWithDriver(false);
}
void IPCThreadState::blockUntilThreadAvailable()
{
pthread_mutex_lock(&mProcess->mThreadCountLock);
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);
}
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() {
alog << "Processing top-level Command: "
<< getReturnString(cmd) << endl;
}
pthread_mutex_lock(&mProcess->mThreadCountLock);
mProcess->mExecutingThreadsCount++;
pthread_mutex_unlock(&mProcess->mThreadCountLock);
result = executeCommand(cmd);
pthread_mutex_lock(&mProcess->mThreadCountLock);
mProcess->mExecutingThreadsCount--;
pthread_cond_broadcast(&mProcess->mThreadCountDecrement);
pthread_mutex_unlock(&mProcess->mThreadCountLock);
// After executing the command, ensure that the thread is returned to the
// foreground cgroup before rejoining the pool. The driver takes care of
// restoring the priority, but doesn't do anything with cgroups so we
// need to take care of that here in userspace. Note that we do make
// sure to go in the foreground after executing a transaction, but
// there are other callbacks into user code that could have changed
// our group so we want to make absolutely sure it is put back.
set_sched_policy(mMyThreadId, SP_FOREGROUND);
}
return result;
}
// When we've cleared the incoming command queue, process any pending derefs
void IPCThreadState::processPendingDerefs()
{
if (mIn.dataPosition() >= mIn.dataSize()) {
size_t numPending = mPendingWeakDerefs.size();
if (numPending > 0) {
for (size_t i = 0; i < numPending; i++) {
RefBase::weakref_type* refs = mPendingWeakDerefs[i];
refs->decWeak(mProcess.get());
}
mPendingWeakDerefs.clear();
}
numPending = mPendingStrongDerefs.size();
if (numPending > 0) {
for (size_t i = 0; i < numPending; i++) {
BBinder* obj = mPendingStrongDerefs[i];
obj->decStrong(mProcess.get());
}
mPendingStrongDerefs.clear();
}
}
}
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);
// This thread may have been spawned by a thread that was in the background
// scheduling group, so first we will make sure it is in the foreground
// one to avoid performing an initial transaction in the background.
set_sched_policy(mMyThreadId, SP_FOREGROUND);
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) {
ALOGE("getAndExecuteCommand(fd=%d) returned unexpected error %d, aborting",
mProcess->mDriverFD, result);
abort();
}
// 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=%p\n",
(void*)pthread_self(), getpid(), (void*)result);
mOut.writeInt32(BC_EXIT_LOOPER);
talkWithDriver(false);
}
int IPCThreadState::setupPolling(int* fd)
{
if (mProcess->mDriverFD <= 0) {
return -EBADF;
}
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 = data.errorCheck();
flags |= TF_ACCEPT_FDS;
IF_LOG_TRANSACTIONS() {
TextOutput::Bundle _b(alog);
alog << "BC_TRANSACTION thr " << (void*)pthread_self() << " / hand "
<< handle << " / code " << TypeCode(code) << ": "
<< indent << data << dedent << endl;
}
if (err == NO_ERROR) {
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, NULL);
}
if (err != NO_ERROR) {
if (reply) reply->setError(err);
return (mLastError = err);
}
if ((flags & TF_ONE_WAY) == 0) {
#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() {
TextOutput::Bundle _b(alog);
alog << "BR_REPLY thr " << (void*)pthread_self() << " / hand "
<< handle << ": ";
if (reply) alog << indent << *reply << dedent << endl;
else alog << "(none requested)" << endl;
}
} else {
err = waitForResponse(NULL, NULL);
}
return err;
}
void IPCThreadState::incStrongHandle(int32_t handle)
{
LOG_REMOTEREFS("IPCThreadState::incStrongHandle(%d)\n", handle);
mOut.writeInt32(BC_ACQUIRE);
mOut.writeInt32(handle);
}
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)
{
LOG_REMOTEREFS("IPCThreadState::incWeakHandle(%d)\n", handle);
mOut.writeInt32(BC_INCREFS);
mOut.writeInt32(handle);
}
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(NULL, &result);
#if LOG_REFCOUNTS
printf("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
printf("IPCThreadState::expungeHandle(%ld)\n", handle);
#endif
self()->mProcess->expungeHandle(handle, binder);
}
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()),
mMyThreadId(gettid()),
mStrictModePolicy(0),
mLastTransactionBinderFlags(0)
{
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, flags, -1, 0, reply, &statusBuffer);
if (err < NO_ERROR) return err;
return waitForResponse(NULL, NULL);
}
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_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 != 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, this);
} else {
err = *reinterpret_cast<const status_t*>(tr.data.ptr.buffer);
freeBuffer(NULL,
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(NULL,
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)
{
Fix shutdown sequence to avoid SIGSEGV when running am command When the app_process is shutting down the main thread will close the binder fd while pool threads are executing an ioctl (in IPCThreadState::stopProcess called by AppRuntime::onStarted in app_main.c). The binder driver will then return all pending calls in ioctl without any error and with a command. One of the threads gets a BR_SPAWN_LOOPER which will create a new thread (the other thread gets a BR_NOOP). This new thread then calls vm->AttachCurrentThread. Usually this results in a log entry with "AndroidRuntime: NOTE: attach of thread 'Binder Thread #3' failed", but sometimes it also causes a SIGSEGV. This depends on the timing between the new thread an the main thread that calls DestroyJavaVM (in AndroidRuntime::start). If IPCThreadState.cpp is compiled with "#define LOG_NDEBUG 0" the pool thread will loop and hit the ALOG_ASSERT(mProcess->mDriverFD >= 0) in IPCThreadState::talkWithDriver. Crashes like this has been seen when running the am command and other commands that use the app_process. This fix makes sure that any command that is received when the driver fd is closed are ignored and IPCThreadState::talkWithDriver instead returns an error which will cause the pool thread to exit and detach itself from the vm. A check to avoid calling ioctl to a fd with -1 was also added in IPCThreadState::threadDestructor. Another solution might be to change the binder driver so that it returns an error when the fd is closed (or atleast not a BR_SPAWN_LOOPER command). It might also be possible to call exit(0) which is done when System.exit(0) is called from java. Change-Id: I3d1f0ff64896c44be2a5994b3a90f7a06d27f429
2011-02-17 13:06:53 +00:00
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() {
TextOutput::Bundle _b(alog);
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(HAVE_ANDROID_OS)
if (ioctl(mProcess->mDriverFD, BINDER_WRITE_READ, &bwr) >= 0)
err = NO_ERROR;
else
err = -errno;
#else
err = INVALID_OPERATION;
#endif
Fix shutdown sequence to avoid SIGSEGV when running am command When the app_process is shutting down the main thread will close the binder fd while pool threads are executing an ioctl (in IPCThreadState::stopProcess called by AppRuntime::onStarted in app_main.c). The binder driver will then return all pending calls in ioctl without any error and with a command. One of the threads gets a BR_SPAWN_LOOPER which will create a new thread (the other thread gets a BR_NOOP). This new thread then calls vm->AttachCurrentThread. Usually this results in a log entry with "AndroidRuntime: NOTE: attach of thread 'Binder Thread #3' failed", but sometimes it also causes a SIGSEGV. This depends on the timing between the new thread an the main thread that calls DestroyJavaVM (in AndroidRuntime::start). If IPCThreadState.cpp is compiled with "#define LOG_NDEBUG 0" the pool thread will loop and hit the ALOG_ASSERT(mProcess->mDriverFD >= 0) in IPCThreadState::talkWithDriver. Crashes like this has been seen when running the am command and other commands that use the app_process. This fix makes sure that any command that is received when the driver fd is closed are ignored and IPCThreadState::talkWithDriver instead returns an error which will cause the pool thread to exit and detach itself from the vm. A check to avoid calling ioctl to a fd with -1 was also added in IPCThreadState::threadDestructor. Another solution might be to change the binder driver so that it returns an error when the fd is closed (or atleast not a BR_SPAWN_LOOPER command). It might also be possible to call exit(0) which is done when System.exit(0) is called from java. Change-Id: I3d1f0ff64896c44be2a5994b3a90f7a06d27f429
2011-02-17 13:06:53 +00:00
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())
mOut.remove(0, bwr.write_consumed);
else
mOut.setDataSize(0);
}
if (bwr.read_consumed > 0) {
mIn.setDataSize(bwr.read_consumed);
mIn.setDataPosition(0);
}
IF_LOG_COMMANDS() {
TextOutput::Bundle _b(alog);
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 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 setTheContextObject(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();
obj = (BBinder*)mIn.readPointer();
// 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:
{
binder_transaction_data tr;
result = mIn.read(&tr, sizeof(tr));
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, this);
const pid_t origPid = mCallingPid;
const uid_t origUid = mCallingUid;
const int32_t origStrictModePolicy = mStrictModePolicy;
const int32_t origTransactionBinderFlags = mLastTransactionBinderFlags;
mCallingPid = tr.sender_pid;
mCallingUid = tr.sender_euid;
mLastTransactionBinderFlags = tr.flags;
Ensure that binder incalls to the system process keep the fg cgroup On binder incalls, the handler thread is given the caller's priority by the driver, but not the caller's cgroup. We have explicit code that sets the handler's cgroup to match the caller's, *except* that the system process explicitly disables this behavior. This led to a siuation in which we were running binder incalls to the system process at nice=10 but cgroup=fg. That's fine as far as it goes, except that if a GC happened in the handler thread, it would be promoted to foreground priority and cgroup both, to avoid having the GC take forever. Then, when GC finished, the original priority is reset, and the cgroup set *based on that priority*. This would push the handler thread into nice=10 cgroup=bg_non_interactive -- which matches the caller, but is supposed to be impossible in the system process. The end result of this was that we could be running "lengthy" operations in the system process in the background. Unfortunately, some of the operations that wound up like this would hold important global system locks for up to twenty seconds as a result, making the entire device unresponsive to input for that period. This CL fixes the binder incall setup to ensure that within the system process, a binder incall is always begun from the normal foreground priority as well as cgroup. In practice now the device still becomes laggy/sluggish when the offending lock-holding time-consuming incall occurs, but since it still runs as a foreground task it is able to proceed to completion within a short time rather than taking 20 seconds. Fixes bug #2403717 Change-Id: Id046aeabd0e80c48eef94accc37842835eab308d
2010-03-19 00:55:03 +00:00
int curPrio = getpriority(PRIO_PROCESS, mMyThreadId);
if (gDisableBackgroundScheduling) {
if (curPrio > ANDROID_PRIORITY_NORMAL) {
// We have inherited a reduced priority from the caller, but do not
// want to run in that state in this process. The driver set our
// priority already (though not our scheduling class), so bounce
// it back to the default before invoking the transaction.
setpriority(PRIO_PROCESS, mMyThreadId, ANDROID_PRIORITY_NORMAL);
}
} else {
if (curPrio >= ANDROID_PRIORITY_BACKGROUND) {
// We want to use the inherited priority from the caller.
// Ensure this thread is in the background scheduling class,
// since the driver won't modify scheduling classes for us.
// The scheduling group is reset to default by the caller
// once this method returns after the transaction is complete.
set_sched_policy(mMyThreadId, SP_BACKGROUND);
Ensure that binder incalls to the system process keep the fg cgroup On binder incalls, the handler thread is given the caller's priority by the driver, but not the caller's cgroup. We have explicit code that sets the handler's cgroup to match the caller's, *except* that the system process explicitly disables this behavior. This led to a siuation in which we were running binder incalls to the system process at nice=10 but cgroup=fg. That's fine as far as it goes, except that if a GC happened in the handler thread, it would be promoted to foreground priority and cgroup both, to avoid having the GC take forever. Then, when GC finished, the original priority is reset, and the cgroup set *based on that priority*. This would push the handler thread into nice=10 cgroup=bg_non_interactive -- which matches the caller, but is supposed to be impossible in the system process. The end result of this was that we could be running "lengthy" operations in the system process in the background. Unfortunately, some of the operations that wound up like this would hold important global system locks for up to twenty seconds as a result, making the entire device unresponsive to input for that period. This CL fixes the binder incall setup to ensure that within the system process, a binder incall is always begun from the normal foreground priority as well as cgroup. In practice now the device still becomes laggy/sluggish when the offending lock-holding time-consuming incall occurs, but since it still runs as a foreground task it is able to proceed to completion within a short time rather than taking 20 seconds. Fixes bug #2403717 Change-Id: Id046aeabd0e80c48eef94accc37842835eab308d
2010-03-19 00:55:03 +00:00
}
}
Ensure that binder incalls to the system process keep the fg cgroup On binder incalls, the handler thread is given the caller's priority by the driver, but not the caller's cgroup. We have explicit code that sets the handler's cgroup to match the caller's, *except* that the system process explicitly disables this behavior. This led to a siuation in which we were running binder incalls to the system process at nice=10 but cgroup=fg. That's fine as far as it goes, except that if a GC happened in the handler thread, it would be promoted to foreground priority and cgroup both, to avoid having the GC take forever. Then, when GC finished, the original priority is reset, and the cgroup set *based on that priority*. This would push the handler thread into nice=10 cgroup=bg_non_interactive -- which matches the caller, but is supposed to be impossible in the system process. The end result of this was that we could be running "lengthy" operations in the system process in the background. Unfortunately, some of the operations that wound up like this would hold important global system locks for up to twenty seconds as a result, making the entire device unresponsive to input for that period. This CL fixes the binder incall setup to ensure that within the system process, a binder incall is always begun from the normal foreground priority as well as cgroup. In practice now the device still becomes laggy/sluggish when the offending lock-holding time-consuming incall occurs, but since it still runs as a foreground task it is able to proceed to completion within a short time rather than taking 20 seconds. Fixes bug #2403717 Change-Id: Id046aeabd0e80c48eef94accc37842835eab308d
2010-03-19 00:55:03 +00:00
//ALOGI(">>>> TRANSACT from pid %d uid %d\n", mCallingPid, mCallingUid);
Parcel reply;
status_t error;
IF_LOG_TRANSACTIONS() {
TextOutput::Bundle _b(alog);
alog << "BR_TRANSACTION thr " << (void*)pthread_self()
<< " / obj " << tr.target.ptr << " / code "
<< TypeCode(tr.code) << ": " << indent << buffer
<< dedent << endl
<< "Data addr = "
<< reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer)
<< ", offsets addr="
<< reinterpret_cast<const size_t*>(tr.data.ptr.offsets) << endl;
}
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 uid %d\n",
// mCallingPid, origPid, origUid);
if ((tr.flags & TF_ONE_WAY) == 0) {
LOG_ONEWAY("Sending reply to %d!", mCallingPid);
if (error < NO_ERROR) reply.setError(error);
sendReply(reply, 0);
} else {
LOG_ONEWAY("NOT sending reply to %d!", mCallingPid);
}
mCallingPid = origPid;
mCallingUid = origUid;
mStrictModePolicy = origStrictModePolicy;
mLastTransactionBinderFlags = origTransactionBinderFlags;
Ensure that binder incalls to the system process keep the fg cgroup On binder incalls, the handler thread is given the caller's priority by the driver, but not the caller's cgroup. We have explicit code that sets the handler's cgroup to match the caller's, *except* that the system process explicitly disables this behavior. This led to a siuation in which we were running binder incalls to the system process at nice=10 but cgroup=fg. That's fine as far as it goes, except that if a GC happened in the handler thread, it would be promoted to foreground priority and cgroup both, to avoid having the GC take forever. Then, when GC finished, the original priority is reset, and the cgroup set *based on that priority*. This would push the handler thread into nice=10 cgroup=bg_non_interactive -- which matches the caller, but is supposed to be impossible in the system process. The end result of this was that we could be running "lengthy" operations in the system process in the background. Unfortunately, some of the operations that wound up like this would hold important global system locks for up to twenty seconds as a result, making the entire device unresponsive to input for that period. This CL fixes the binder incall setup to ensure that within the system process, a binder incall is always begun from the normal foreground priority as well as cgroup. In practice now the device still becomes laggy/sluggish when the offending lock-holding time-consuming incall occurs, but since it still runs as a foreground task it is able to proceed to completion within a short time rather than taking 20 seconds. Fixes bug #2403717 Change-Id: Id046aeabd0e80c48eef94accc37842835eab308d
2010-03-19 00:55:03 +00:00
IF_LOG_TRANSACTIONS() {
TextOutput::Bundle _b(alog);
alog << "BC_REPLY thr " << (void*)pthread_self() << " / obj "
<< tr.target.ptr << ": " << indent << reply << dedent << endl;
}
}
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:
printf("*** BAD COMMAND %d received from Binder driver\n", cmd);
result = UNKNOWN_ERROR;
break;
}
if (result != NO_ERROR) {
mLastError = result;
}
return result;
}
void IPCThreadState::threadDestructor(void *st)
{
IPCThreadState* const self = static_cast<IPCThreadState*>(st);
if (self) {
self->flushCommands();
#if defined(HAVE_ANDROID_OS)
Fix shutdown sequence to avoid SIGSEGV when running am command When the app_process is shutting down the main thread will close the binder fd while pool threads are executing an ioctl (in IPCThreadState::stopProcess called by AppRuntime::onStarted in app_main.c). The binder driver will then return all pending calls in ioctl without any error and with a command. One of the threads gets a BR_SPAWN_LOOPER which will create a new thread (the other thread gets a BR_NOOP). This new thread then calls vm->AttachCurrentThread. Usually this results in a log entry with "AndroidRuntime: NOTE: attach of thread 'Binder Thread #3' failed", but sometimes it also causes a SIGSEGV. This depends on the timing between the new thread an the main thread that calls DestroyJavaVM (in AndroidRuntime::start). If IPCThreadState.cpp is compiled with "#define LOG_NDEBUG 0" the pool thread will loop and hit the ALOG_ASSERT(mProcess->mDriverFD >= 0) in IPCThreadState::talkWithDriver. Crashes like this has been seen when running the am command and other commands that use the app_process. This fix makes sure that any command that is received when the driver fd is closed are ignored and IPCThreadState::talkWithDriver instead returns an error which will cause the pool thread to exit and detach itself from the vm. A check to avoid calling ioctl to a fd with -1 was also added in IPCThreadState::threadDestructor. Another solution might be to change the binder driver so that it returns an error when the fd is closed (or atleast not a BR_SPAWN_LOOPER command). It might also be possible to call exit(0) which is done when System.exit(0) is called from java. Change-Id: I3d1f0ff64896c44be2a5994b3a90f7a06d27f429
2011-02-17 13:06:53 +00:00
if (self->mProcess->mDriverFD > 0) {
ioctl(self->mProcess->mDriverFD, BINDER_THREAD_EXIT, 0);
}
#endif
delete self;
}
}
void IPCThreadState::freeBuffer(Parcel* parcel, const uint8_t* data,
size_t /*dataSize*/,
const binder_size_t* /*objects*/,
size_t /*objectsSize*/, void* /*cookie*/)
{
//ALOGI("Freeing parcel %p", &parcel);
IF_LOG_COMMANDS() {
alog << "Writing BC_FREE_BUFFER for " << data << endl;
}
ALOG_ASSERT(data != NULL, "Called with NULL data");
if (parcel != NULL) parcel->closeFileDescriptors();
IPCThreadState* state = self();
state->mOut.writeInt32(BC_FREE_BUFFER);
state->mOut.writePointer((uintptr_t)data);
}
}; // namespace android