1 /* 2 * Copyright (C) 2005 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ANDROID_HARDWARE_IPC_THREAD_STATE_H 18 #define ANDROID_HARDWARE_IPC_THREAD_STATE_H 19 20 #include <utils/Errors.h> 21 #include <hwbinder/Parcel.h> 22 #include <hwbinder/ProcessState.h> 23 #include <utils/Vector.h> 24 25 #if defined(_WIN32) 26 typedef int uid_t; 27 #endif 28 29 // --------------------------------------------------------------------------- 30 namespace android { 31 namespace hardware { 32 33 class IPCThreadState 34 { 35 public: 36 static IPCThreadState* self(); 37 static IPCThreadState* selfOrNull(); // self(), but won't instantiate 38 39 sp<ProcessState> process(); 40 41 status_t clearLastError(); 42 43 pid_t getCallingPid() const; 44 uid_t getCallingUid() const; 45 46 void setStrictModePolicy(int32_t policy); 47 int32_t getStrictModePolicy() const; 48 49 void setLastTransactionBinderFlags(int32_t flags); 50 int32_t getLastTransactionBinderFlags() const; 51 52 int64_t clearCallingIdentity(); 53 void restoreCallingIdentity(int64_t token); 54 55 int setupPolling(int* fd); 56 status_t handlePolledCommands(); 57 void flushCommands(); 58 59 void joinThreadPool(bool isMain = true); 60 61 // Stop the local process. 62 void stopProcess(bool immediate = true); 63 64 status_t transact(int32_t handle, 65 uint32_t code, const Parcel& data, 66 Parcel* reply, uint32_t flags); 67 68 void incStrongHandle(int32_t handle, BpHwBinder *proxy); 69 void decStrongHandle(int32_t handle); 70 void incWeakHandle(int32_t handle, BpHwBinder *proxy); 71 void decWeakHandle(int32_t handle); 72 status_t attemptIncStrongHandle(int32_t handle); 73 static void expungeHandle(int32_t handle, IBinder* binder); 74 status_t requestDeathNotification( int32_t handle, 75 BpHwBinder* proxy); 76 status_t clearDeathNotification( int32_t handle, 77 BpHwBinder* proxy); 78 79 static void shutdown(); 80 81 // Call this to disable switching threads to background scheduling when 82 // receiving incoming IPC calls. This is specifically here for the 83 // Android system process, since it expects to have background apps calling 84 // in to it but doesn't want to acquire locks in its services while in 85 // the background. 86 static void disableBackgroundScheduling(bool disable); 87 88 // Call blocks until the number of executing binder threads is less than 89 // the maximum number of binder threads threads allowed for this process. 90 void blockUntilThreadAvailable(); 91 92 // Service manager registration 93 void setTheContextObject(sp<BHwBinder> obj); 94 95 bool isLooperThread(); 96 bool isOnlyBinderThread(); 97 98 private: 99 IPCThreadState(); 100 ~IPCThreadState(); 101 102 status_t sendReply(const Parcel& reply, uint32_t flags); 103 status_t waitForResponse(Parcel *reply, 104 status_t *acquireResult=NULL); 105 status_t talkWithDriver(bool doReceive=true); 106 status_t writeTransactionData(int32_t cmd, 107 uint32_t binderFlags, 108 int32_t handle, 109 uint32_t code, 110 const Parcel& data, 111 status_t* statusBuffer); 112 status_t getAndExecuteCommand(); 113 status_t executeCommand(int32_t command); 114 void processPendingDerefs(); 115 void processPostWriteDerefs(); 116 117 void clearCaller(); 118 119 static void threadDestructor(void *st); 120 static void freeBuffer(Parcel* parcel, 121 const uint8_t* data, size_t dataSize, 122 const binder_size_t* objects, size_t objectsSize, 123 void* cookie); 124 125 const sp<ProcessState> mProcess; 126 const pid_t mMyThreadId; 127 Vector<BHwBinder*> mPendingStrongDerefs; 128 Vector<RefBase::weakref_type*> mPendingWeakDerefs; 129 Vector<RefBase*> mPostWriteStrongDerefs; 130 Vector<RefBase::weakref_type*> mPostWriteWeakDerefs; 131 Parcel mIn; 132 Parcel mOut; 133 status_t mLastError; 134 pid_t mCallingPid; 135 uid_t mCallingUid; 136 int32_t mStrictModePolicy; 137 int32_t mLastTransactionBinderFlags; 138 sp<BHwBinder> mContextObject; 139 bool mIsLooper; 140 bool mIsPollingThread; 141 }; 142 143 }; // namespace hardware 144 }; // namespace android 145 146 // --------------------------------------------------------------------------- 147 148 #endif // ANDROID_HARDWARE_IPC_THREAD_STATE_H 149