Binder系列1—Binder Driver初探

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android6.0

kernel/drivers/ (不同Linux分支路径略有不同) - staging/android/binder.c - android/binder.c

./work/android-5.0.2/frameworks/native/cmds/servicemanager/binder.c
./work/linux-3.0.86/drivers/staging/android/binder.c

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流程如下:

IPC

Zygote socket

Client Server ServiceManager binder

Service Server

Service Manager

binder_init

misc_register

binder_open

binder_mmap

void *start,void *end,

物理空间映射到虚拟进程空间

binder_ioctl

binder_get_thread

binder_ref ->BpBinder

binder_node->BnBinder

binder_transaction_data

write_buffer->BC_TRANSACTION

read_buffer->BR_TRANSACTION write_buffer->BC_TRANSACTION

union {
struct {
binder_uintptr_t buffer; //数据区起始地址
binder_uintptr_t offsets; //数据区IPC对象偏移量
} ptr;
__u8 buf[8];
} data; //RPC数据

flat_binder_object

struct binder_transaction_data {
union {
__u32 handle; //binder_ref（即handle）->BpBinder(客户端)
binder_uintptr_t ptr; //Binder_node的内存地址 - >BnBinder（服务端）
} target; //RPC目标

}

binder_ref ->BpBinder

binder_node->BnBinder

binder_transaction

3. 源码附录

本文基于Linux 4.4源码, 从上之下, 整个Binder架构所涉及的总共有以下5个目录:

/framework/base/core/java/               (Java)/framework/base/core/jni/                (JNI)/framework/native/libs/binder            (Native)/framework/native/cmds/servicemanager/   (Native)/kernel/drivers/android                  (Driver)

（1）Java framework

/framework/base/core/java/android/os/      - IServiceManager.java    - ServiceManager.java    - ServiceManagerNative.java    - IInterface.java    - IBinder.java    - Parcel.java    - Binder.java      - IHwInterface.java    - IHwBinder.java    - HwParcel.java    - HwBinder.java    - HwRemoteBinder.java/framework/base/core/jni/        - AndroidRuntime.cpp    - android_os_Parcel.cpp    - android_util_Binder.cpp    - android_os_HwParcel.cpp    - android_os_HwBinder.cpp    - android_os_Parcel.h    - android_util_Binder.h    - android_os_HwParcel.h    - android_os_HwBinder.h

（2）Native framework

/framework/native/libs/binder             - IServiceManager.cpp    - Interface.cpp    - Binder.cpp    - BpBinder.cpp    - Parcel.cpp    - IPCThreadState.cpp    - ProcessState.cpp/framework/native/libs/binder/include/binder    - IServiceManager.h    - Interface.h    - Binder.h    - BpBinder.h    - Parcel.h    - IPCThreadState.h    - ProcessState.h    - BinderService.h/framework/native/cmds/servicemanager/    - service_manager.c    - binder.c    - binder.h

（3）Kernel

/kernel/drivers/android/    - binder.c    - binder_alloc.c    - binder_alloc.h/kernel/include/uapi/linux/android/    - binder.h

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