2009-03-04 03:31:44 +00:00
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/*
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* Copyright (C) 2005 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "ProcessState"
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#include <cutils/process_name.h>
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2009-05-20 02:08:10 +00:00
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#include <binder/ProcessState.h>
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2009-03-04 03:31:44 +00:00
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#include <utils/Atomic.h>
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2009-05-20 02:08:10 +00:00
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#include <binder/BpBinder.h>
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#include <binder/IPCThreadState.h>
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2009-03-04 03:31:44 +00:00
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#include <utils/Log.h>
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#include <utils/String8.h>
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2009-05-20 02:08:10 +00:00
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#include <binder/IServiceManager.h>
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2009-03-04 03:31:44 +00:00
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#include <utils/String8.h>
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#include <utils/threads.h>
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2009-05-18 22:08:03 +00:00
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#include <private/binder/binder_module.h>
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#include <private/binder/Static.h>
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2009-03-04 03:31:44 +00:00
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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2009-10-31 01:39:55 +00:00
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#define BINDER_VM_SIZE ((1*1024*1024) - (4096 *2))
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2009-03-04 03:31:44 +00:00
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// ---------------------------------------------------------------------------
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namespace android {
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// Global variables
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int mArgC;
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const char* const* mArgV;
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int mArgLen;
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class PoolThread : public Thread
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{
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public:
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PoolThread(bool isMain)
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: mIsMain(isMain)
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{
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}
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protected:
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virtual bool threadLoop()
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{
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IPCThreadState::self()->joinThreadPool(mIsMain);
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return false;
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}
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const bool mIsMain;
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};
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sp<ProcessState> ProcessState::self()
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{
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2012-04-17 02:30:56 +00:00
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Mutex::Autolock _l(gProcessMutex);
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if (gProcess != NULL) {
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return gProcess;
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}
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gProcess = new ProcessState;
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2009-03-04 03:31:44 +00:00
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return gProcess;
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}
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void ProcessState::setContextObject(const sp<IBinder>& object)
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{
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setContextObject(object, String16("default"));
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}
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2014-02-06 01:42:44 +00:00
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sp<IBinder> ProcessState::getContextObject(const sp<IBinder>& /*caller*/)
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2009-03-04 03:31:44 +00:00
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{
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2011-07-09 01:52:57 +00:00
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return getStrongProxyForHandle(0);
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2009-03-04 03:31:44 +00:00
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}
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void ProcessState::setContextObject(const sp<IBinder>& object, const String16& name)
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{
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AutoMutex _l(mLock);
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mContexts.add(name, object);
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}
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sp<IBinder> ProcessState::getContextObject(const String16& name, const sp<IBinder>& caller)
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{
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mLock.lock();
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sp<IBinder> object(
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mContexts.indexOfKey(name) >= 0 ? mContexts.valueFor(name) : NULL);
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mLock.unlock();
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//printf("Getting context object %s for %p\n", String8(name).string(), caller.get());
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if (object != NULL) return object;
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// Don't attempt to retrieve contexts if we manage them
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if (mManagesContexts) {
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2012-01-06 19:20:56 +00:00
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ALOGE("getContextObject(%s) failed, but we manage the contexts!\n",
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2009-03-04 03:31:44 +00:00
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String8(name).string());
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return NULL;
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}
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IPCThreadState* ipc = IPCThreadState::self();
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{
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Parcel data, reply;
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// no interface token on this magic transaction
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data.writeString16(name);
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data.writeStrongBinder(caller);
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status_t result = ipc->transact(0 /*magic*/, 0, data, &reply, 0);
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if (result == NO_ERROR) {
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object = reply.readStrongBinder();
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}
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}
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ipc->flushCommands();
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if (object != NULL) setContextObject(object, name);
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return object;
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}
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void ProcessState::startThreadPool()
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{
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AutoMutex _l(mLock);
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if (!mThreadPoolStarted) {
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mThreadPoolStarted = true;
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spawnPooledThread(true);
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}
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}
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bool ProcessState::isContextManager(void) const
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{
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return mManagesContexts;
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}
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bool ProcessState::becomeContextManager(context_check_func checkFunc, void* userData)
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{
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if (!mManagesContexts) {
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AutoMutex _l(mLock);
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mBinderContextCheckFunc = checkFunc;
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mBinderContextUserData = userData;
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2011-07-09 01:52:57 +00:00
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int dummy = 0;
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status_t result = ioctl(mDriverFD, BINDER_SET_CONTEXT_MGR, &dummy);
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if (result == 0) {
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2009-03-04 03:31:44 +00:00
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mManagesContexts = true;
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2011-07-09 01:52:57 +00:00
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} else if (result == -1) {
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mBinderContextCheckFunc = NULL;
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mBinderContextUserData = NULL;
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2012-01-06 19:20:56 +00:00
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ALOGE("Binder ioctl to become context manager failed: %s\n", strerror(errno));
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2009-03-04 03:31:44 +00:00
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}
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}
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return mManagesContexts;
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}
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ProcessState::handle_entry* ProcessState::lookupHandleLocked(int32_t handle)
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{
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const size_t N=mHandleToObject.size();
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if (N <= (size_t)handle) {
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handle_entry e;
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e.binder = NULL;
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e.refs = NULL;
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status_t err = mHandleToObject.insertAt(e, N, handle+1-N);
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if (err < NO_ERROR) return NULL;
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}
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return &mHandleToObject.editItemAt(handle);
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}
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sp<IBinder> ProcessState::getStrongProxyForHandle(int32_t handle)
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{
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sp<IBinder> result;
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AutoMutex _l(mLock);
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handle_entry* e = lookupHandleLocked(handle);
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if (e != NULL) {
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// We need to create a new BpBinder if there isn't currently one, OR we
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// are unable to acquire a weak reference on this current one. See comment
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// in getWeakProxyForHandle() for more info about this.
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IBinder* b = e->binder;
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if (b == NULL || !e->refs->attemptIncWeak(this)) {
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2013-06-19 00:25:37 +00:00
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if (handle == 0) {
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// Special case for context manager...
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// The context manager is the only object for which we create
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// a BpBinder proxy without already holding a reference.
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// Perform a dummy transaction to ensure the context manager
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// is registered before we create the first local reference
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// to it (which will occur when creating the BpBinder).
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// If a local reference is created for the BpBinder when the
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// context manager is not present, the driver will fail to
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// provide a reference to the context manager, but the
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// driver API does not return status.
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//
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// Note that this is not race-free if the context manager
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// dies while this code runs.
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//
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// TODO: add a driver API to wait for context manager, or
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// stop special casing handle 0 for context manager and add
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// a driver API to get a handle to the context manager with
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// proper reference counting.
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Parcel data;
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status_t status = IPCThreadState::self()->transact(
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0, IBinder::PING_TRANSACTION, data, NULL, 0);
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if (status == DEAD_OBJECT)
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return NULL;
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}
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2009-03-04 03:31:44 +00:00
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b = new BpBinder(handle);
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e->binder = b;
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if (b) e->refs = b->getWeakRefs();
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result = b;
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} else {
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// This little bit of nastyness is to allow us to add a primary
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// reference to the remote proxy when this team doesn't have one
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// but another team is sending the handle to us.
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result.force_set(b);
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e->refs->decWeak(this);
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}
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}
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return result;
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}
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wp<IBinder> ProcessState::getWeakProxyForHandle(int32_t handle)
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{
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wp<IBinder> result;
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AutoMutex _l(mLock);
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handle_entry* e = lookupHandleLocked(handle);
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if (e != NULL) {
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// We need to create a new BpBinder if there isn't currently one, OR we
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// are unable to acquire a weak reference on this current one. The
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// attemptIncWeak() is safe because we know the BpBinder destructor will always
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// call expungeHandle(), which acquires the same lock we are holding now.
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// We need to do this because there is a race condition between someone
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// releasing a reference on this BpBinder, and a new reference on its handle
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// arriving from the driver.
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IBinder* b = e->binder;
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if (b == NULL || !e->refs->attemptIncWeak(this)) {
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b = new BpBinder(handle);
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result = b;
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e->binder = b;
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if (b) e->refs = b->getWeakRefs();
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} else {
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result = b;
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e->refs->decWeak(this);
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}
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}
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return result;
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}
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void ProcessState::expungeHandle(int32_t handle, IBinder* binder)
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{
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AutoMutex _l(mLock);
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handle_entry* e = lookupHandleLocked(handle);
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// This handle may have already been replaced with a new BpBinder
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// (if someone failed the AttemptIncWeak() above); we don't want
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// to overwrite it.
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if (e && e->binder == binder) e->binder = NULL;
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}
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void ProcessState::setArgs(int argc, const char* const argv[])
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{
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mArgC = argc;
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mArgV = (const char **)argv;
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mArgLen = 0;
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for (int i=0; i<argc; i++) {
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mArgLen += strlen(argv[i]) + 1;
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}
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mArgLen--;
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}
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int ProcessState::getArgC() const
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{
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return mArgC;
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}
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const char* const* ProcessState::getArgV() const
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{
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return mArgV;
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}
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void ProcessState::setArgV0(const char* txt)
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{
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if (mArgV != NULL) {
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strncpy((char*)mArgV[0], txt, mArgLen);
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set_process_name(txt);
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}
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}
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2013-03-07 23:34:28 +00:00
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String8 ProcessState::makeBinderThreadName() {
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int32_t s = android_atomic_add(1, &mThreadPoolSeq);
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String8 name;
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name.appendFormat("Binder_%X", s);
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return name;
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}
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2009-03-04 03:31:44 +00:00
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void ProcessState::spawnPooledThread(bool isMain)
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{
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if (mThreadPoolStarted) {
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2013-03-07 23:34:28 +00:00
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String8 name = makeBinderThreadName();
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ALOGV("Spawning new pooled thread, name=%s\n", name.string());
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2009-03-04 03:31:44 +00:00
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sp<Thread> t = new PoolThread(isMain);
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2013-03-07 23:34:28 +00:00
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t->run(name.string());
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2009-03-04 03:31:44 +00:00
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}
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}
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2012-04-17 23:11:08 +00:00
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status_t ProcessState::setThreadPoolMaxThreadCount(size_t maxThreads) {
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status_t result = NO_ERROR;
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if (ioctl(mDriverFD, BINDER_SET_MAX_THREADS, &maxThreads) == -1) {
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result = -errno;
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ALOGE("Binder ioctl to set max threads failed: %s", strerror(-result));
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}
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return result;
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}
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2013-03-07 23:34:28 +00:00
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void ProcessState::giveThreadPoolName() {
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androidSetThreadName( makeBinderThreadName().string() );
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}
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2009-03-04 03:31:44 +00:00
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static int open_driver()
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{
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int fd = open("/dev/binder", O_RDWR);
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if (fd >= 0) {
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fcntl(fd, F_SETFD, FD_CLOEXEC);
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int vers;
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status_t result = ioctl(fd, BINDER_VERSION, &vers);
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if (result == -1) {
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2012-01-06 19:20:56 +00:00
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ALOGE("Binder ioctl to obtain version failed: %s", strerror(errno));
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2009-03-04 03:31:44 +00:00
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close(fd);
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fd = -1;
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}
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if (result != 0 || vers != BINDER_CURRENT_PROTOCOL_VERSION) {
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2012-01-06 19:20:56 +00:00
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ALOGE("Binder driver protocol does not match user space protocol!");
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2009-03-04 03:31:44 +00:00
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close(fd);
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fd = -1;
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}
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size_t maxThreads = 15;
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result = ioctl(fd, BINDER_SET_MAX_THREADS, &maxThreads);
|
|
|
|
if (result == -1) {
|
2012-01-06 19:20:56 +00:00
|
|
|
ALOGE("Binder ioctl to set max threads failed: %s", strerror(errno));
|
2009-03-04 03:31:44 +00:00
|
|
|
}
|
|
|
|
} else {
|
2012-01-05 23:22:43 +00:00
|
|
|
ALOGW("Opening '/dev/binder' failed: %s\n", strerror(errno));
|
2009-03-04 03:31:44 +00:00
|
|
|
}
|
|
|
|
return fd;
|
|
|
|
}
|
|
|
|
|
|
|
|
ProcessState::ProcessState()
|
|
|
|
: mDriverFD(open_driver())
|
|
|
|
, mVMStart(MAP_FAILED)
|
|
|
|
, mManagesContexts(false)
|
|
|
|
, mBinderContextCheckFunc(NULL)
|
|
|
|
, mBinderContextUserData(NULL)
|
|
|
|
, mThreadPoolStarted(false)
|
|
|
|
, mThreadPoolSeq(1)
|
|
|
|
{
|
|
|
|
if (mDriverFD >= 0) {
|
|
|
|
// XXX Ideally, there should be a specific define for whether we
|
|
|
|
// have mmap (or whether we could possibly have the kernel module
|
|
|
|
// availabla).
|
|
|
|
#if !defined(HAVE_WIN32_IPC)
|
|
|
|
// mmap the binder, providing a chunk of virtual address space to receive transactions.
|
|
|
|
mVMStart = mmap(0, BINDER_VM_SIZE, PROT_READ, MAP_PRIVATE | MAP_NORESERVE, mDriverFD, 0);
|
|
|
|
if (mVMStart == MAP_FAILED) {
|
|
|
|
// *sigh*
|
2012-01-06 19:20:56 +00:00
|
|
|
ALOGE("Using /dev/binder failed: unable to mmap transaction memory.\n");
|
2009-03-04 03:31:44 +00:00
|
|
|
close(mDriverFD);
|
|
|
|
mDriverFD = -1;
|
|
|
|
}
|
|
|
|
#else
|
|
|
|
mDriverFD = -1;
|
|
|
|
#endif
|
|
|
|
}
|
2011-07-09 01:52:57 +00:00
|
|
|
|
|
|
|
LOG_ALWAYS_FATAL_IF(mDriverFD < 0, "Binder driver could not be opened. Terminating.");
|
2009-03-04 03:31:44 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
ProcessState::~ProcessState()
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
|
|
|
}; // namespace android
|