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
26typedef  int  uid_t;
27#endif
28
29// ---------------------------------------------------------------------------
30namespace android {
31
32class IPCThreadState
33{
34public:
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() const;
43            int                 getCallingUid() const;
44
45            void                setStrictModePolicy(int32_t policy);
46            int32_t             getStrictModePolicy() const;
47
48            void                setLastTransactionBinderFlags(int32_t flags);
49            int32_t             getLastTransactionBinderFlags() const;
50
51            int64_t             clearCallingIdentity();
52            void                restoreCallingIdentity(int64_t token);
53
54            int                 setupPolling(int* fd);
55            status_t            handlePolledCommands();
56            void                flushCommands();
57
58            void                joinThreadPool(bool isMain = true);
59
60            // Stop the local process.
61            void                stopProcess(bool immediate = true);
62
63            status_t            transact(int32_t handle,
64                                         uint32_t code, const Parcel& data,
65                                         Parcel* reply, uint32_t flags);
66
67            void                incStrongHandle(int32_t handle);
68            void                decStrongHandle(int32_t handle);
69            void                incWeakHandle(int32_t handle);
70            void                decWeakHandle(int32_t handle);
71            status_t            attemptIncStrongHandle(int32_t handle);
72    static  void                expungeHandle(int32_t handle, IBinder* binder);
73            status_t            requestDeathNotification(   int32_t handle,
74                                                            BpBinder* proxy);
75            status_t            clearDeathNotification( int32_t handle,
76                                                        BpBinder* proxy);
77
78    static  void                shutdown();
79
80    // Call this to disable switching threads to background scheduling when
81    // receiving incoming IPC calls.  This is specifically here for the
82    // Android system process, since it expects to have background apps calling
83    // in to it but doesn't want to acquire locks in its services while in
84    // the background.
85    static  void                disableBackgroundScheduling(bool disable);
86
87private:
88                                IPCThreadState();
89                                ~IPCThreadState();
90
91            status_t            sendReply(const Parcel& reply, uint32_t flags);
92            status_t            waitForResponse(Parcel *reply,
93                                                status_t *acquireResult=NULL);
94            status_t            talkWithDriver(bool doReceive=true);
95            status_t            writeTransactionData(int32_t cmd,
96                                                     uint32_t binderFlags,
97                                                     int32_t handle,
98                                                     uint32_t code,
99                                                     const Parcel& data,
100                                                     status_t* statusBuffer);
101            status_t            getAndExecuteCommand();
102            status_t            executeCommand(int32_t command);
103            void                processPendingDerefs();
104
105            void                clearCaller();
106
107    static  void                threadDestructor(void *st);
108    static  void                freeBuffer(Parcel* parcel,
109                                           const uint8_t* data, size_t dataSize,
110                                           const binder_size_t* objects, size_t objectsSize,
111                                           void* cookie);
112
113    const   sp<ProcessState>    mProcess;
114    const   pid_t               mMyThreadId;
115            Vector<BBinder*>    mPendingStrongDerefs;
116            Vector<RefBase::weakref_type*> mPendingWeakDerefs;
117
118            Parcel              mIn;
119            Parcel              mOut;
120            status_t            mLastError;
121            pid_t               mCallingPid;
122            uid_t               mCallingUid;
123            int32_t             mStrictModePolicy;
124            int32_t             mLastTransactionBinderFlags;
125};
126
127}; // namespace android
128
129// ---------------------------------------------------------------------------
130
131#endif // ANDROID_IPC_THREAD_STATE_H
132