2 * Copyright (C) 2008 The Android Open Source Project
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 #ifndef ANDROID_IBINDER_H
18 #define ANDROID_IBINDER_H
20 #include <utils/Errors.h>
21 #include <utils/RefBase.h>
22 #include <utils/String16.h>
23 #include <utils/Vector.h>
26 // linux/binder.h already defines this, but we can't just include it from there
27 // because there are host builds that include this file.
29 #define B_PACK_CHARS(c1, c2, c3, c4) \
30 ((((c1)<<24)) | (((c2)<<16)) | (((c3)<<8)) | (c4))
31 #endif // B_PACK_CHARS
33 // ---------------------------------------------------------------------------
40 class IResultReceiver;
44 * Base class and low-level protocol for a remotable object.
45 * You can derive from this class to create an object for which other
46 * processes can hold references to it. Communication between processes
47 * (method calls, property get and set) is down through a low-level
48 * protocol implemented on top of the transact() API.
50 class IBinder : public virtual RefBase
54 FIRST_CALL_TRANSACTION = 0x00000001,
55 LAST_CALL_TRANSACTION = 0x00ffffff,
57 PING_TRANSACTION = B_PACK_CHARS('_','P','N','G'),
58 DUMP_TRANSACTION = B_PACK_CHARS('_','D','M','P'),
59 SHELL_COMMAND_TRANSACTION = B_PACK_CHARS('_','C','M','D'),
60 INTERFACE_TRANSACTION = B_PACK_CHARS('_', 'N', 'T', 'F'),
61 SYSPROPS_TRANSACTION = B_PACK_CHARS('_', 'S', 'P', 'R'),
63 // Corresponds to TF_ONE_WAY -- an asynchronous call.
64 FLAG_ONEWAY = 0x00000001
70 * Check if this IBinder implements the interface named by
71 * @a descriptor. If it does, the base pointer to it is returned,
72 * which you can safely static_cast<> to the concrete C++ interface.
74 virtual sp<IInterface> queryLocalInterface(const String16& descriptor);
77 * Return the canonical name of the interface provided by this IBinder
80 virtual const String16& getInterfaceDescriptor() const = 0;
82 virtual bool isBinderAlive() const = 0;
83 virtual status_t pingBinder() = 0;
84 virtual status_t dump(int fd, const Vector<String16>& args) = 0;
85 static status_t shellCommand(const sp<IBinder>& target, int in, int out, int err,
86 Vector<String16>& args, const sp<IShellCallback>& callback,
87 const sp<IResultReceiver>& resultReceiver);
89 virtual status_t transact( uint32_t code,
92 uint32_t flags = 0) = 0;
94 // DeathRecipient is pure abstract, there is no virtual method
95 // implementation to put in a translation unit in order to silence the
96 // weak vtables warning.
97 #if defined(__clang__)
98 #pragma clang diagnostic push
99 #pragma clang diagnostic ignored "-Wweak-vtables"
102 class DeathRecipient : public virtual RefBase
105 virtual void binderDied(const wp<IBinder>& who) = 0;
108 #if defined(__clang__)
109 #pragma clang diagnostic pop
113 * Register the @a recipient for a notification if this binder
114 * goes away. If this binder object unexpectedly goes away
115 * (typically because its hosting process has been killed),
116 * then DeathRecipient::binderDied() will be called with a reference
119 * The @a cookie is optional -- if non-NULL, it should be a
120 * memory address that you own (that is, you know it is unique).
122 * @note You will only receive death notifications for remote binders,
123 * as local binders by definition can't die without you dying as well.
124 * Trying to use this function on a local binder will result in an
125 * INVALID_OPERATION code being returned and nothing happening.
127 * @note This link always holds a weak reference to its recipient.
129 * @note You will only receive a weak reference to the dead
130 * binder. You should not try to promote this to a strong reference.
131 * (Nor should you need to, as there is nothing useful you can
132 * directly do with it now that it has passed on.)
134 virtual status_t linkToDeath(const sp<DeathRecipient>& recipient,
136 uint32_t flags = 0) = 0;
139 * Remove a previously registered death notification.
140 * The @a recipient will no longer be called if this object
141 * dies. The @a cookie is optional. If non-NULL, you can
142 * supply a NULL @a recipient, and the recipient previously
143 * added with that cookie will be unlinked.
145 virtual status_t unlinkToDeath( const wp<DeathRecipient>& recipient,
148 wp<DeathRecipient>* outRecipient = NULL) = 0;
150 virtual bool checkSubclass(const void* subclassID) const;
152 typedef void (*object_cleanup_func)(const void* id, void* obj, void* cleanupCookie);
154 virtual void attachObject( const void* objectID,
157 object_cleanup_func func) = 0;
158 virtual void* findObject(const void* objectID) const = 0;
159 virtual void detachObject(const void* objectID) = 0;
161 virtual BBinder* localBinder();
162 virtual BpBinder* remoteBinder();
170 }; // namespace android
172 // ---------------------------------------------------------------------------
174 #endif // ANDROID_IBINDER_H