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_IPC_THREAD_STATE_H 18 #define ANDROID_IPC_THREAD_STATE_H 19 20 #include <utils/Errors.h> 21 #include <binder/Parcel.h> 22 #include <binder/ProcessState.h> 23 #include <utils/Vector.h> 24 25 #ifdef HAVE_WIN32_PROC 26 typedef int uid_t; 27 #endif 28 29 // --------------------------------------------------------------------------- 30 namespace android { 31 32 class IPCThreadState 33 { 34 public: 35 static IPCThreadState* self(); 36 static IPCThreadState* selfOrNull(); // self(), but won't instantiate 37 38 sp<ProcessState> process(); 39 40 status_t clearLastError(); 41 42 int getCallingPid(); 43 int getCallingUid(); 44 int getOrigCallingUid(); 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 void flushCommands(); 56 57 void joinThreadPool(bool isMain = true); 58 59 // Stop the local process. 60 void stopProcess(bool immediate = true); 61 62 status_t transact(int32_t handle, 63 uint32_t code, const Parcel& data, 64 Parcel* reply, uint32_t flags); 65 66 void incStrongHandle(int32_t handle); 67 void decStrongHandle(int32_t handle); 68 void incWeakHandle(int32_t handle); 69 void decWeakHandle(int32_t handle); 70 status_t attemptIncStrongHandle(int32_t handle); 71 static void expungeHandle(int32_t handle, IBinder* binder); 72 status_t requestDeathNotification( int32_t handle, 73 BpBinder* proxy); 74 status_t clearDeathNotification( int32_t handle, 75 BpBinder* proxy); 76 77 static void shutdown(); 78 79 // Call this to disable switching threads to background scheduling when 80 // receiving incoming IPC calls. This is specifically here for the 81 // Android system process, since it expects to have background apps calling 82 // in to it but doesn't want to acquire locks in its services while in 83 // the background. 84 static void disableBackgroundScheduling(bool disable); 85 86 private: 87 IPCThreadState(); 88 ~IPCThreadState(); 89 90 status_t sendReply(const Parcel& reply, uint32_t flags); 91 status_t waitForResponse(Parcel *reply, 92 status_t *acquireResult=NULL); 93 status_t talkWithDriver(bool doReceive=true); 94 status_t writeTransactionData(int32_t cmd, 95 uint32_t binderFlags, 96 int32_t handle, 97 uint32_t code, 98 const Parcel& data, 99 status_t* statusBuffer); 100 status_t executeCommand(int32_t command); 101 102 void clearCaller(); 103 104 static void threadDestructor(void *st); 105 static void freeBuffer(Parcel* parcel, 106 const uint8_t* data, size_t dataSize, 107 const size_t* objects, size_t objectsSize, 108 void* cookie); 109 110 const sp<ProcessState> mProcess; 111 const pid_t mMyThreadId; 112 Vector<BBinder*> mPendingStrongDerefs; 113 Vector<RefBase::weakref_type*> mPendingWeakDerefs; 114 115 Parcel mIn; 116 Parcel mOut; 117 status_t mLastError; 118 pid_t mCallingPid; 119 uid_t mCallingUid; 120 uid_t mOrigCallingUid; 121 int32_t mStrictModePolicy; 122 int32_t mLastTransactionBinderFlags; 123 }; 124 125 }; // namespace android 126 127 // --------------------------------------------------------------------------- 128 129 #endif // ANDROID_IPC_THREAD_STATE_H 130