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      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