android binder

• Overview

http://blog.youkuaiyun.com/myarrow/article/details/7045078

• Linux device driver model

a new device object:

/sys/devices/virtual/misc/binder/

device file

/dev/binder

VFS operations

drivers\staging\android\binder.c

init:

binder_init ->misc_register ->device_create

bind_open:

  create a new binder_proc, add to binder_procs, link to filp->private_data

binder_mmap:

   详见 mmap进行内存映射的原理

   http://blog.chinaunix.net/uid-26669729-id-3077015.html

1.在用户虚拟地址空间中寻找空闲的满足要求的一段连续的虚拟地址空间,为映射做准备(由内核mmap系统调用完成)

2. 建立虚拟地址空间(第一部中建立的地址空间)和文件或设备的物理地址之间的映射(设备驱动完成)()

bind_ioctl()

   for service manager:  BINDER_SET_CONTEXT_MGR, create a new binder_node

   

bind_ioctl(,  BINDER_WRITE_READ,  )

    write/read data

• insight source code 
  

refer to mediaservice

frameworks\av\media\mediaserver\Main_mediaserver.cpp

to define a service

refer:

http://www.cnblogs.com/innost/archive/2011/01/09/1931456.html

<Understanding the Linux Kernel>